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Crovetto L, Venn AA, Sevilgen D, Tambutté S, Tambutté E. Spatial variability of and effect of light on the cœlenteron pH of a reef coral. Commun Biol 2024; 7:246. [PMID: 38424314 PMCID: PMC10904758 DOI: 10.1038/s42003-024-05938-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 02/19/2024] [Indexed: 03/02/2024] Open
Abstract
Coral reefs, the largest bioconstruction on Earth, are formed by calcium carbonate skeletons of corals. Coral skeleton formation commonly referred to as calcification occurs in a specific compartment, the extracellular calcifying medium (ECM), located between the aboral ectoderm and the skeleton. Calcification models often assume a direct link between the surrounding seawater and the ECM. However, the ECM is separated from the seawater by several tissue layers and the cœlenteron, which contains the cœlenteric fluid found in both polyps and cœnosarc (tissue connecting the polyps). Symbiotic dinoflagellate-containing cells line the cœlenteron and their photosynthetic activity contributes to changes in the chemistry of the cœlenteric fluid, particularly with respect to pH. The aim of our study is to compare cœlenteron pH between the cœnosarc and polyps and to compare areas of high or low dinoflagellate density based on tissue coloration. To achieve this, we use liquid ion exchange (LIX) pH microsensors to profile pH in the cœlenteron of polyps and the cœnosarc in different regions of the coral colony in light and darkness. We interpret our results in terms of what light and dark exposure means for proton gradients between the ECM and the coelenteron, and how this could affect calcification.
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Affiliation(s)
- Lucas Crovetto
- Marine Biology Department, Centre Scientifique de Monaco, 98000, Monaco
- Sorbonne Université - ED 515 Complexité du Vivant, 75005, Paris, France
| | - Alexander A Venn
- Marine Biology Department, Centre Scientifique de Monaco, 98000, Monaco
| | - Duygu Sevilgen
- Marine Biology Department, Centre Scientifique de Monaco, 98000, Monaco
| | - Sylvie Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 98000, Monaco.
| | - Eric Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 98000, Monaco
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2
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Canesi M, Douville É, Bordier L, Dapoigny A, Coulibaly GE, Montagna P, Béraud É, Allemand D, Planes S, Furla P, Gilson E, Roberty S, Zoccola D, Reynaud S. Porites' coral calcifying fluid chemistry regulation under normal- and low-pH seawater conditions in Palau Archipelago: Impacts on growth properties. Sci Total Environ 2024; 911:168552. [PMID: 38007109 DOI: 10.1016/j.scitotenv.2023.168552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 11/07/2023] [Accepted: 11/11/2023] [Indexed: 11/27/2023]
Abstract
Ongoing ocean acidification is known to be a major threat to tropical coral reefs. To date, only few studies have evaluated the impacts of natural long-term exposure to low-pH seawater on the chemical regulation and growth of reef-building corals. This work investigated the different responses of the massive Porites coral living at normal (pHsw ~ 8.03) and naturally low-pH (pHsw ~ 7.85) seawater conditions at Palau over the last decades. Our results show that both Porites colonies maintained similar carbonate properties (pHcf, [CO32-]cf, DICcf, and Ωcf) within their calcifying fluid since 1972. However, the Porites skeleton of the more acidified conditions revealed a significantly lower density (~ 1.21 ± 0.09 g·cm-3) than the skeleton from the open-ocean site (~ 1.41 ± 0.07 g·cm-3). Overall, both Porites colonies exerted a strong biological control to maintain stable calcifying fluid carbonate chemistry that favored the calcification process, especially under low-pH conditions. However, the decline in skeletal density observed at low pH provides critical insights into Porites vulnerability to future global change.
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Affiliation(s)
- Marine Canesi
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 911 91 Gif-sur-Yvette, France; Centre Scientifique de Monaco, 8 Quai Antoine Ier, 98000 Monaco, Principality of Monaco, Monaco; LIA ROPSE, Laboratoire International Associé Université Côte d'Azur - Centre Scientifique de Monaco, Monaco.
| | - Éric Douville
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 911 91 Gif-sur-Yvette, France
| | - Louise Bordier
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 911 91 Gif-sur-Yvette, France
| | - Arnaud Dapoigny
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 911 91 Gif-sur-Yvette, France
| | - Gninwoyo Eric Coulibaly
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 911 91 Gif-sur-Yvette, France
| | - Paolo Montagna
- Istituto di Scienze Polari (ISP), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129 Bologna, Italy; National Biodiversity Future Center S.c.a.r.l., Piazza Marina 61, Palermo, Italy
| | - Éric Béraud
- Centre Scientifique de Monaco, 8 Quai Antoine Ier, 98000 Monaco, Principality of Monaco, Monaco; LIA ROPSE, Laboratoire International Associé Université Côte d'Azur - Centre Scientifique de Monaco, Monaco
| | - Denis Allemand
- Centre Scientifique de Monaco, 8 Quai Antoine Ier, 98000 Monaco, Principality of Monaco, Monaco; LIA ROPSE, Laboratoire International Associé Université Côte d'Azur - Centre Scientifique de Monaco, Monaco
| | - Serge Planes
- Laboratoire d'Excellence "CORAIL", PSL Research University: EPHE-UPVD-CNRS, USR 3278 CRIOBE, Université de Perpignan, 66100 Perpignan, France
| | - Paola Furla
- LIA ROPSE, Laboratoire International Associé Université Côte d'Azur - Centre Scientifique de Monaco, Monaco; Université Côte d'Azur, CNRS, INSERM, Institute for Research on Cancer and Aging, Nice (IRCAN), Nice, France; Université Côte d'Azur, Institut Fédératif de Recherche - Ressources Marines (IFR MARRES), Nice, France
| | - Eric Gilson
- LIA ROPSE, Laboratoire International Associé Université Côte d'Azur - Centre Scientifique de Monaco, Monaco; Université Côte d'Azur, CNRS, INSERM, Institute for Research on Cancer and Aging, Nice (IRCAN), Nice, France; Université Côte d'Azur, Institut Fédératif de Recherche - Ressources Marines (IFR MARRES), Nice, France; Department of Medical Genetics, CHU, Nice, France
| | - Stephane Roberty
- InBioS - Animal Physiology and Ecophysiology, Department of Biology, Ecology & Evolution, University of Liège, Liège, Belgium
| | - Didier Zoccola
- Centre Scientifique de Monaco, 8 Quai Antoine Ier, 98000 Monaco, Principality of Monaco, Monaco; LIA ROPSE, Laboratoire International Associé Université Côte d'Azur - Centre Scientifique de Monaco, Monaco
| | - Stéphanie Reynaud
- Centre Scientifique de Monaco, 8 Quai Antoine Ier, 98000 Monaco, Principality of Monaco, Monaco; LIA ROPSE, Laboratoire International Associé Université Côte d'Azur - Centre Scientifique de Monaco, Monaco
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3
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Ram S, Erez J. Anion elements incorporation into corals skeletons: Experimental approach for biomineralization and paleo-proxies. Proc Natl Acad Sci U S A 2023; 120:e2306627120. [PMID: 37917794 PMCID: PMC10636356 DOI: 10.1073/pnas.2306627120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Accepted: 09/19/2023] [Indexed: 11/04/2023] Open
Abstract
The elemental composition of coral skeletons provides important information for palaeoceanographic reconstructions and coral biomineralization. Partition of anions and their stable isotopes in coral skeleton enables the reconstruction of past seawater carbonate chemistry, paleo-CO2, and past climates. Here, we investigated the partition of B, S, As, Br, I, and Mo into the skeletons of two corals, Acropora cervicornis and Pocillopora damicornis, as a function of calcium and carbonate concentrations.* Anion-to-calcium ratio in the corals (An/CaCoral) were correlated with the equivalent ratios in the culturing seawater (An/CO32-SW). Negative intercepts of these relationships suggest a higher CO32- concentration in the coral extracellular calcifying fluid (ECF) relative to seawater, from which the skeleton precipitates. The enrichment factor of CO32- at the ECF was 2.5 for A. cervicornis and 1.9 for P. damicornis, consistent with their relative calcification rates. The CO32-ECF concentrations thus calculated are similar to those proposed by previous studies based on B/Ca coupled with δ11B, as well as by direct measurements using microsensors and fluorescent dyes. Rayleigh fractionation modeling demonstrates a uniform Ca utilization at various CaSW concentrations, providing further evidence that coral calcification occurs directly from a semiclosed seawater reservoir as reported previously. The partition coefficients reported in this study for B, S, As, Br, I, and Mo open up wide possibilities for past ocean chemistry reconstructions based on Br having long residence time (~160 Ma) in the ocean. Other elements like S, Mo, B, as well as pCO2 may also be calculated based on these elements in fossil coral.
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Affiliation(s)
- Sharon Ram
- The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem9190401, Israel
| | - Jonathan Erez
- The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem9190401, Israel
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Willard HF, Deutekom ES, Allemand D, Tambutté S, Kaandorp JA. Testing hypotheses on the calcification in scleractinian corals using a spatio-temporal model that shows a high degree of robustness. J Theor Biol 2023; 561:111382. [PMID: 36610694 DOI: 10.1016/j.jtbi.2022.111382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 12/05/2022] [Accepted: 12/07/2022] [Indexed: 01/06/2023]
Abstract
Calcification in photosynthetic scleractinian corals is a complicated process that involves many different biological, chemical, and physical sub-processes that happen within and around the coral tissue. Identifying and quantifying the role of separate processes in vivo or in vitro is difficult or not possible. A computational model can facilitate this research by simulating the sub-processes independently. This study presents a spatio-temporal model of the calcification physiology, which is based on processes that are considered essential for calcification: respiration, photosynthesis, Ca2+-ATPase, carbonic anhydrase. The model is used to test different hypotheses considering ion transport across the calicoblastic cells and Light Enhanced Calcification (LEC). It is also used to quantify the effect of ocean acidification (OA) on the Extracellular Calcifying Medium (ECM) and ATP-consumption of Ca2+-ATPase. It was able to reproduce the experimental data of three separate studies and finds that paracellular transport plays a minor role compared to transcellular transport. In the model, LEC results from increased Ca2+-ATPase activity in combination with increased metabolism. Implementing OA increases the concentration of CO2 throughout the entire tissue, thereby increasing the availability of CO3- in the ECM. As a result, the model finds that calcification becomes more energy-demanding and the calcification rate increases.
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Affiliation(s)
- Helena F Willard
- Computational Science Lab, Informatics Institute, University of Amsterdam, Amsterdam, The Netherlands
| | - Eva S Deutekom
- Computational Science Lab, Informatics Institute, University of Amsterdam, Amsterdam, The Netherlands
| | - Denis Allemand
- Centre Scientifique de Monaco, Avenue Saint Martin, 98000, Monaco
| | - Sylvie Tambutté
- Centre Scientifique de Monaco, Avenue Saint Martin, 98000, Monaco
| | - Jaap A Kaandorp
- Computational Science Lab, Informatics Institute, University of Amsterdam, Amsterdam, The Netherlands.
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5
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Brown KT, Mello-Athayde MA, Sampayo EM, Chai A, Dove S, Barott KL. Environmental memory gained from exposure to extreme pCO 2 variability promotes coral cellular acid-base homeostasis. Proc Biol Sci 2022; 289:20220941. [PMID: 36100023 PMCID: PMC9470260 DOI: 10.1098/rspb.2022.0941] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Ocean acidification is a growing threat to coral growth and the accretion of coral reef ecosystems. Corals inhabiting environments that already endure extreme diel pCO2 fluctuations, however, may represent acidification-resilient populations capable of persisting on future reefs. Here, we examined the impact of pCO2 variability on the reef-building coral Pocillopora damicornis originating from reefs with contrasting environmental histories (variable reef flat versus stable reef slope) following reciprocal exposure to stable (218 ± 9) or variable (911 ± 31) diel pCO2 amplitude (μtam) in aquaria over eight weeks. Endosymbiont density, photosynthesis and net calcification rates differed between origins but not treatment, whereas primary calcification (extension) was affected by both origin and acclimatization to novel pCO2 conditions. At the cellular level, corals from the variable reef flat exhibited less intracellular pH (pHi) acidosis and faster pHi recovery rates in response to experimental acidification stress (pH 7.40) than corals originating from the stable reef slope, suggesting environmental memory gained from lifelong exposure to pCO2 variability led to an improved ability to regulate acid–base homeostasis. These results highlight the role of cellular processes in maintaining acidification resilience and suggest that prior exposure to pCO2 variability may promote more acidification-resilient coral populations in a changing climate.
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Affiliation(s)
- Kristen T Brown
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA.,ARC Centre of Excellence for Coral Reef Studies and School of Biological Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Matheus A Mello-Athayde
- ARC Centre of Excellence for Coral Reef Studies and School of Biological Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Eugenia M Sampayo
- ARC Centre of Excellence for Coral Reef Studies and School of Biological Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Aaron Chai
- ARC Centre of Excellence for Coral Reef Studies and School of Biological Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Sophie Dove
- ARC Centre of Excellence for Coral Reef Studies and School of Biological Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Katie L Barott
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
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6
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Roik A, Reverter M, Pogoreutz C. A roadmap to understanding diversity and function of coral reef-associated fungi. FEMS Microbiol Rev 2022; 46:6615459. [PMID: 35746877 PMCID: PMC9629503 DOI: 10.1093/femsre/fuac028] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 06/01/2022] [Accepted: 06/14/2022] [Indexed: 01/09/2023] Open
Abstract
Tropical coral reefs are hotspots of marine productivity, owing to the association of reef-building corals with endosymbiotic algae and metabolically diverse bacterial communities. However, the functional importance of fungi, well-known for their contribution to shaping terrestrial ecosystems and global nutrient cycles, remains underexplored on coral reefs. We here conceptualize how fungal functional traits may have facilitated the spread, diversification, and ecological adaptation of marine fungi on coral reefs. We propose that functions of reef-associated fungi may be diverse and go beyond their hitherto described roles of pathogens and bioeroders, including but not limited to reef-scale biogeochemical cycles and the structuring of coral-associated and environmental microbiomes via chemical mediation. Recent technological and conceptual advances will allow the elucidation of the physiological, ecological, and chemical contributions of understudied marine fungi to coral holobiont and reef ecosystem functioning and health and may help provide an outlook for reef management actions.
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Affiliation(s)
- Anna Roik
- Corresponding author: Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg (HIFMB), Ammerländer Heerstrasse 231, D-26129 Oldenburg, Germany. E-mail:
| | - Miriam Reverter
- Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky University of Oldenburg, Wilhelmshaven, 26046, Germany,School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, United Kingdom
| | - Claudia Pogoreutz
- Corresponding author: Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne, Switzerland.,
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7
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Fietzke J, Wall M. Distinct fine-scale variations in calcification control revealed by high-resolution 2D boron laser images in the cold-water coral Lophelia pertusa. Sci Adv 2022; 8:eabj4172. [PMID: 35302850 PMCID: PMC8932653 DOI: 10.1126/sciadv.abj4172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 01/26/2022] [Indexed: 05/18/2023]
Abstract
Coral calcification is a complex biologically controlled process of hard skeleton formation, and it is influenced by environmental conditions. The chemical composition of coral skeletons responds to calcification conditions and can be used to gain insights into both the control asserted by the organism and the environment. Boron and its isotopic composition have been of particular interest because of links to carbon chemistry and pH. In this study, we acquired high-resolution boron images (concentration and isotopes) in a skeleton sample of the azooxanthellate cold-water coral Lophelia pertusa. We observed high boron variability at a small spatial scale related to skeletal structure. This implies differences in calcification control during different stages of skeleton formation. Our data point to bicarbonate active transport as a critical pathway during early skeletal growth, and the variable activity rates explain the majority of the observed boron systematic.
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Affiliation(s)
- Jan Fietzke
- GEOMAR Helmholtz Center for Ocean Research Kiel, Wischhofstr. 1-3, 24148 Kiel, Germany
- Corresponding author.
| | - Marlene Wall
- GEOMAR Helmholtz Center for Ocean Research Kiel, Wischhofstr. 1-3, 24148 Kiel, Germany
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), Am Handelshafen 12, 27570 Bremerhaven, Germany
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Gilbert PUPA, Bergmann KD, Boekelheide N, Tambutté S, Mass T, Marin F, Adkins JF, Erez J, Gilbert B, Knutson V, Cantine M, Hernández JO, Knoll AH. Biomineralization: Integrating mechanism and evolutionary history. Sci Adv 2022; 8:eabl9653. [PMID: 35263127 PMCID: PMC8906573 DOI: 10.1126/sciadv.abl9653] [Citation(s) in RCA: 47] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Calcium carbonate (CaCO3) biomineralizing organisms have played major roles in the history of life and the global carbon cycle during the past 541 Ma. Both marine diversification and mass extinctions reflect physiological responses to environmental changes through time. An integrated understanding of carbonate biomineralization is necessary to illuminate this evolutionary record and to understand how modern organisms will respond to 21st century global change. Biomineralization evolved independently but convergently across phyla, suggesting a unity of mechanism that transcends biological differences. In this review, we combine CaCO3 skeleton formation mechanisms with constraints from evolutionary history, omics, and a meta-analysis of isotopic data to develop a plausible model for CaCO3 biomineralization applicable to all phyla. The model provides a framework for understanding the environmental sensitivity of marine calcifiers, past mass extinctions, and resilience in 21st century acidifying oceans. Thus, it frames questions about the past, present, and future of CaCO3 biomineralizing organisms.
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Affiliation(s)
- Pupa U. P. A. Gilbert
- Departments of Physics, Chemistry, Geoscience, and Materials Science, University of Wisconsin-Madison, Madison, WI 53706, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Corresponding author. (P.U.P.A.G.); (A.H.K.)
| | - Kristin D. Bergmann
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Nicholas Boekelheide
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Sylvie Tambutté
- Centre Scientifique de Monaco, Department of Marine Biology, 98000 Monaco, Principality of Monaco
| | - Tali Mass
- University of Haifa, Marine Biology Department, Mt. Carmel, Haifa 31905, Israel
| | - Frédéric Marin
- Université de Bourgogne–Franche-Comté (UBFC), Laboratoire Biogéosciences, UMR CNRS 6282, Bâtiment des Sciences Gabriel, 21000 Dijon, France
| | - Jess F. Adkins
- Geological and Planetary Sciences, California Institute of Technology, MS 100-23, Pasadena, CA 91125, USA
| | - Jonathan Erez
- The Hebrew University of Jerusalem, Institute of Earth Sciences, Jerusalem 91904, Israel
| | - Benjamin Gilbert
- Energy Geoscience Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Vanessa Knutson
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
| | - Marjorie Cantine
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - Javier Ortega Hernández
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
| | - Andrew H. Knoll
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
- Corresponding author. (P.U.P.A.G.); (A.H.K.)
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Barmherzig DA, Sun J. Towards practical holographic coherent diffraction imaging via maximum likelihood estimation. Opt Express 2022; 30:6886-6906. [PMID: 35299464 DOI: 10.1364/oe.445015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 01/13/2022] [Indexed: 06/14/2023]
Abstract
A new algorithmic framework is developed for holographic coherent diffraction imaging (HCDI) based on maximum likelihood estimation (MLE). This method provides superior image reconstruction results for various practical HCDI settings, such as when data is highly corrupted by Poisson shot noise and when low-frequency data is missing due to occlusion from a beamstop apparatus. This method is also highly robust in that it can be implemented using a variety of standard numerical optimization algorithms, and requires fewer constraints on the physical HCDI setup compared to current algorithms. The mathematical framework developed using MLE is also applicable beyond HCDI to any holographic imaging setup where data is corrupted by Poisson shot noise.
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Cornwall CE, Comeau S, Putnam H, Schoepf V. Impacts of ocean warming and acidification on calcifying coral reef taxa: mechanisms responsible and adaptive capacity. Emerg Top Life Sci 2022:ETLS20210226. [PMID: 35157039 DOI: 10.1042/ETLS20210226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 01/24/2022] [Accepted: 01/26/2022] [Indexed: 11/17/2022]
Abstract
Ocean warming (OW) and acidification (OA) are two of the greatest global threats to the persistence of coral reefs. Calcifying reef taxa such as corals and coralline algae provide the essential substrate and habitat in tropical reefs but are at particular risk due to their susceptibility to both OW and OA. OW poses the greater threat to future reef growth and function, via its capacity to destabilise the productivity of both taxa, and to cause mass bleaching events and mortality of corals. Marine heatwaves are projected to increase in frequency, intensity, and duration over the coming decades, raising the question of whether coral reefs will be able to persist as functioning ecosystems and in what form. OA should not be overlooked, as its negative impacts on the calcification of reef-building corals and coralline algae will have consequences for global reef accretion. Given that OA can have negative impacts on the reproduction and early life stages of both coralline algae and corals, the interdependence of these taxa may result in negative feedbacks for reef replenishment. However, there is little evidence that OA causes coral bleaching or exacerbates the effects of OW on coral bleaching. Instead, there is some evidence that OA alters the photo-physiology of both taxa. Tropical coralline algal possess shorter generation times than corals, which could enable more rapid evolutionary responses. Future reefs will be dominated by taxa with shorter generation times and high plasticity, or those individuals inherently resistant and resilient to both marine heatwaves and OA.
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Servetto N, de Aranzamendi MC, Bettencourt R, Held C, Abele D, Movilla J, González G, Bustos DM, Sahade R. Molecular mechanisms underlying responses of the Antarctic coral Malacobelemnon daytoni to ocean acidification. Mar Environ Res 2021; 170:105430. [PMID: 34340030 DOI: 10.1016/j.marenvres.2021.105430] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 07/15/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Benthic organisms of the Southern Ocean are particularly vulnerable to ocean acidification (OA), as they inhabit cold waters where calcite-aragonite saturation states are naturally low. OA most strongly affects animals with calcium carbonate skeletons or shells, such as corals and mollusks. We exposed the abundant cold-water coral Malacobelemnon daytoni from an Antarctic fjord to low pH seawater (LpH) (7.68 ± 0.17) to test its physiological responses to OA, at the level of gene expression (RT-PCR) and enzyme activity. Corals were exposed in short- (3 days) and long-term (54 days) experiments to two pCO2 conditions (ambient and elevated pCO2 equaling RCP 8.5, IPCC 2019, approximately 372.53 and 956.78 μatm, respectively). Of the eleven genes studied through RT-PCR, six were significantly upregulated compared with control in the short-term in the LpH condition, including the antioxidant enzyme superoxide dismutase (SOD), Heat Shock Protein 70 (HSP70), Toll-like receptor (TLR), galaxin and ferritin. After long-term exposure to low pH conditions, RT-PCR analysis showed seven genes were upregulated. These include the mannose-binding C-Lectin and HSP90. Also, the expression of TLR and galaxin, among others, continued to be upregulated after long-term exposure to LpH. Expression of carbonic anhydrase (CA), a key enzyme involved in calcification, was also significantly upregulated after long-term exposure. Our results indicated that, after two months, M. daytoni is not acclimatized to this experimental LpH condition. Gene expression profiles revealed molecular impacts that were not evident at the enzyme activity level. Consequently, understanding the molecular mechanisms behind the physiological processes in the response of a coral to LpH is critical to understanding the ability of polar species to cope with future environmental changes. Approaches integrating molecular tools into Antarctic ecological and/or conservation research make an essential contribution given the current ongoing OA processes.
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Affiliation(s)
- N Servetto
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales.,Cátedra de Ecología Marina, Av. Vélez Sarsfield 299, X5000JJC, Córdoba, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Diversidad y Ecología Animal (IDEA), Ecosistemas Marinos Polares, Av. Vélez Sarsfield 299, X5000JJC, Córdoba, Argentina.
| | - M C de Aranzamendi
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales.,Cátedra de Ecología Marina, Av. Vélez Sarsfield 299, X5000JJC, Córdoba, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Diversidad y Ecología Animal (IDEA), Ecosistemas Marinos Polares, Av. Vélez Sarsfield 299, X5000JJC, Córdoba, Argentina
| | - R Bettencourt
- OKEANOS Marine Research Center/Department of Oceanography and Fisheries, Faculty of Science and Technology, University of the Azores, 9900-862, Horta, Portugal
| | - C Held
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, 27570, Bremerhaven, Germany
| | - D Abele
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, 27570, Bremerhaven, Germany
| | - J Movilla
- Instituto Español de Oceanografía, Centro Oceanográfico de Baleares, Estación de Investigación Jaume Ferrer, La Mola s/n 07720, Menorca, Spain
| | - G González
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales.,Cátedra de Ecología Marina, Av. Vélez Sarsfield 299, X5000JJC, Córdoba, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Diversidad y Ecología Animal (IDEA), Ecosistemas Marinos Polares, Av. Vélez Sarsfield 299, X5000JJC, Córdoba, Argentina
| | - D M Bustos
- Laboratorio de Integración de Señales Celulares, Instituto de Histología y Embriología de Mendoza (IHEM CONICET-UNCUYO), and Facultad de Ciencias Exactas y Naturales (UNCUYO), Mendoza, Argentina
| | - R Sahade
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales.,Cátedra de Ecología Marina, Av. Vélez Sarsfield 299, X5000JJC, Córdoba, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Diversidad y Ecología Animal (IDEA), Ecosistemas Marinos Polares, Av. Vélez Sarsfield 299, X5000JJC, Córdoba, Argentina.
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12
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Innis T, Allen-Waller L, Brown KT, Sparagon W, Carlson C, Kruse E, Huffmyer AS, Nelson CE, Putnam HM, Barott KL. Marine heatwaves depress metabolic activity and impair cellular acid-base homeostasis in reef-building corals regardless of bleaching susceptibility. Glob Chang Biol 2021; 27:2728-2743. [PMID: 33784420 DOI: 10.1111/gcb.15622] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 03/18/2021] [Accepted: 03/21/2021] [Indexed: 06/12/2023]
Abstract
Ocean warming is causing global coral bleaching events to increase in frequency, resulting in widespread coral mortality and disrupting the function of coral reef ecosystems. However, even during mass bleaching events, many corals resist bleaching despite exposure to abnormally high temperatures. While the physiological effects of bleaching have been well documented, the consequences of heat stress for bleaching-resistant individuals are not well understood. In addition, much remains to be learned about how heat stress affects cellular-level processes that may be overlooked at the organismal level, yet are crucial for coral performance in the short term and ecological success over the long term. Here we compared the physiological and cellular responses of bleaching-resistant and bleaching-susceptible corals throughout the 2019 marine heatwave in Hawai'i, a repeat bleaching event that occurred 4 years after the previous regional event. Relative bleaching susceptibility within species was consistent between the two bleaching events, yet corals of both resistant and susceptible phenotypes exhibited pronounced metabolic depression during the heatwave. At the cellular level, bleaching-susceptible corals had lower intracellular pH than bleaching-resistant corals at the peak of bleaching for both symbiont-hosting and symbiont-free cells, indicating greater disruption of acid-base homeostasis in bleaching-susceptible individuals. Notably, cells from both phenotypes were unable to compensate for experimentally induced cellular acidosis, indicating that acid-base regulation was significantly impaired at the cellular level even in bleaching-resistant corals and in cells containing symbionts. Thermal disturbances may thus have substantial ecological consequences, as even small reallocations in energy budgets to maintain homeostasis during stress can negatively affect fitness. These results suggest concern is warranted for corals coping with ocean acidification alongside ocean warming, as the feedback between temperature stress and acid-base regulation may further exacerbate the physiological effects of climate change.
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Affiliation(s)
- Teegan Innis
- Department of Biology, University of Pennsylvania, Philadelphia, PA, USA
| | | | - Kristen T Brown
- Department of Biology, University of Pennsylvania, Philadelphia, PA, USA
- ARC Centre of Excellence for Coral Reef Studies and School of Biological Sciences, University of Queensland, St. Lucia, Qld, Australia
| | - Wesley Sparagon
- Daniel K. Inouye Center for Microbial Oceanography: Research and Education, Department of Oceanography and Sea Grant College Program, University of Hawai'i at Mānoa, Honolulu, HI, USA
| | | | - Elisa Kruse
- Department of Biology, University of Pennsylvania, Philadelphia, PA, USA
| | - Ariana S Huffmyer
- Department of Biological Sciences, University of Rhode Island, Kingston, RI, USA
| | - Craig E Nelson
- Daniel K. Inouye Center for Microbial Oceanography: Research and Education, Department of Oceanography and Sea Grant College Program, University of Hawai'i at Mānoa, Honolulu, HI, USA
| | - Hollie M Putnam
- Department of Biological Sciences, University of Rhode Island, Kingston, RI, USA
| | - Katie L Barott
- Department of Biology, University of Pennsylvania, Philadelphia, PA, USA
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13
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Roger LM, Reich HG, Lawrence E, Li S, Vizgaudis W, Brenner N, Kumar L, Klein-Seetharaman J, Yang J, Putnam HM, Lewinski NA. Applying model approaches in non-model systems: A review and case study on coral cell culture. PLoS One 2021; 16:e0248953. [PMID: 33831033 PMCID: PMC8031391 DOI: 10.1371/journal.pone.0248953] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 03/09/2021] [Indexed: 12/19/2022] Open
Abstract
Model systems approaches search for commonality in patterns underlying biological diversity and complexity led by common evolutionary paths. The success of the approach does not rest on the species chosen but on the scalability of the model and methods used to develop the model and engage research. Fine-tuning approaches to improve coral cell cultures will provide a robust platform for studying symbiosis breakdown, the calcification mechanism and its disruption, protein interactions, micronutrient transport/exchange, and the toxicity of nanoparticles, among other key biological aspects, with the added advantage of minimizing the ethical conundrum of repeated testing on ecologically threatened organisms. The work presented here aimed to lay the foundation towards development of effective methods to sort and culture reef-building coral cells with the ultimate goal of obtaining immortal cell lines for the study of bleaching, disease and toxicity at the cellular and polyp levels. To achieve this objective, the team conducted a thorough review and tested the available methods (i.e. cell dissociation, isolation, sorting, attachment and proliferation). The most effective and reproducible techniques were combined to consolidate culture methods and generate uncontaminated coral cell cultures for ~7 days (10 days maximum). The tests were conducted on scleractinian corals Pocillopora acuta of the same genotype to harmonize results and reduce variation linked to genetic diversity. The development of cell separation and identification methods in conjunction with further investigations into coral cell-type specific metabolic requirements will allow us to tailor growth media for optimized monocultures as a tool for studying essential reef-building coral traits such as symbiosis, wound healing and calcification at multiple scales.
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Affiliation(s)
- Liza M. Roger
- Life Science and Engineering, Virginia Commonwealth University, Richmond, Virginia, United States of America
- * E-mail: ,
| | - Hannah G. Reich
- Department of Biological Sciences, University of Rhode Island, Kingston, Rhode Island, United States of America
| | - Evan Lawrence
- Life Science and Engineering, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Shuaifeng Li
- Aeronautics and Astronautics, University of Washington, Seattle, Washington, United States of America
| | - Whitney Vizgaudis
- Department of Chemistry, Colorado School of Mines, Golden, Colorado, United States of America
| | - Nathan Brenner
- Department of Chemistry, Colorado School of Mines, Golden, Colorado, United States of America
| | - Lokender Kumar
- Department of Chemistry, Colorado School of Mines, Golden, Colorado, United States of America
| | | | - Jinkyu Yang
- Aeronautics and Astronautics, University of Washington, Seattle, Washington, United States of America
| | - Hollie M. Putnam
- Department of Biological Sciences, University of Rhode Island, Kingston, Rhode Island, United States of America
| | - Nastassja A. Lewinski
- Life Science and Engineering, Virginia Commonwealth University, Richmond, Virginia, United States of America
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14
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Capasso L, Ganot P, Planas-Bielsa V, Tambutté S, Zoccola D. Intracellular pH regulation: characterization and functional investigation of H + transporters in Stylophora pistillata. BMC Mol Cell Biol 2021; 22:18. [PMID: 33685406 PMCID: PMC7941709 DOI: 10.1186/s12860-021-00353-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 02/22/2021] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Reef-building corals regularly experience changes in intra- and extracellular H+ concentrations ([H+]) due to physiological and environmental processes. Stringent control of [H+] is required to maintain the homeostatic acid-base balance in coral cells and is achieved through the regulation of intracellular pH (pHi). This task is especially challenging for reef-building corals that share an endosymbiotic relationship with photosynthetic dinoflagellates (family Symbiodinaceae), which significantly affect the pHi of coral cells. Despite their importance, the pH regulatory proteins involved in the homeostatic acid-base balance have been scarcely investigated in corals. Here, we report in the coral Stylophora pistillata a full characterization of the genomic structure, domain topology and phylogeny of three major H+ transporter families that are known to play a role in the intracellular pH regulation of animal cells; we investigated their tissue-specific expression patterns and assessed the effect of seawater acidification on their expression levels. RESULTS We identified members of the Na+/H+ exchanger (SLC9), vacuolar-type electrogenic H+-ATP hydrolase (V-ATPase) and voltage-gated proton channel (HvCN) families in the genome and transcriptome of S. pistillata. In addition, we identified a novel member of the HvCN gene family in the cnidarian subclass Hexacorallia that has not been previously described in any species. We also identified key residues that contribute to H+ transporter substrate specificity, protein function and regulation. Last, we demonstrated that some of these proteins have different tissue expression patterns, and most are unaffected by exposure to seawater acidification. CONCLUSIONS In this study, we provide the first characterization of H+ transporters that might contribute to the homeostatic acid-base balance in coral cells. This work will enrich the knowledge of the basic aspects of coral biology and has important implications for our understanding of how corals regulate their intracellular environment.
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Affiliation(s)
- Laura Capasso
- Centre Scientifique de Monaco, 8 quai Antoine 1er, 98000, Monaco, Monaco.,Sorbonne Université, Collège Doctoral, F-75005, Paris, France
| | - Philippe Ganot
- Centre Scientifique de Monaco, 8 quai Antoine 1er, 98000, Monaco, Monaco
| | | | - Sylvie Tambutté
- Centre Scientifique de Monaco, 8 quai Antoine 1er, 98000, Monaco, Monaco
| | - Didier Zoccola
- Centre Scientifique de Monaco, 8 quai Antoine 1er, 98000, Monaco, Monaco.
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15
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Chalk TB, Standish CD, D'Angelo C, Castillo KD, Milton JA, Foster GL. Mapping coral calcification strategies from in situ boron isotope and trace element measurements of the tropical coral Siderastrea siderea. Sci Rep 2021; 11:472. [PMID: 33436642 DOI: 10.1038/s41598-020-78778-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 11/30/2020] [Indexed: 02/02/2023] Open
Abstract
Boron isotopic and elemental analysis of coral aragonite can give important insights into the calcification strategies employed in coral skeletal construction. Traditional methods of analysis have limited spatial (and thus temporal) resolution, hindering attempts to unravel skeletal heterogeneity. Laser ablation mass spectrometry allows a much more refined view, and here we employ these techniques to explore boron isotope and co-varying elemental ratios in the tropical coral Siderastrea siderea. We generate two-dimensional maps of the carbonate parameters within the calcification medium that deposited the skeleton, which reveal large heterogeneities in carbonate chemistry across the macro-structure of a coral polyp. These differences have the potential to bias proxy interpretations, and indicate that different processes facilitated precipitation of different parts of the coral skeleton: the low-density columella being precipitated from a fluid with a carbonate composition closer to seawater, compared to the high-density inter-polyp walls where aragonite saturation was ~ 5 times that of external seawater. Therefore, the skeleton does not precipitate from a spatially homogeneous fluid and its different parts may thus have varying sensitivity to environmental stress. This offers new insights into the mechanisms behind the response of the S. siderea skeletal phenotype to ocean acidification.
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16
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Guillermic M, Cameron LP, De Corte I, Misra S, Bijma J, de Beer D, Reymond CE, Westphal H, Ries JB, Eagle RA. Thermal stress reduces pocilloporid coral resilience to ocean acidification by impairing control over calcifying fluid chemistry. Sci Adv 2021; 7:7/2/eaba9958. [PMID: 33523983 PMCID: PMC7793579 DOI: 10.1126/sciadv.aba9958] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 11/11/2020] [Indexed: 06/04/2023]
Abstract
The combination of thermal stress and ocean acidification (OA) can more negatively affect coral calcification than an individual stressors, but the mechanism behind this interaction is unknown. We used two independent methods (microelectrode and boron geochemistry) to measure calcifying fluid pH (pHcf) and carbonate chemistry of the corals Pocillopora damicornis and Stylophora pistillata grown under various temperature and pCO2 conditions. Although these approaches demonstrate that they record pHcf over different time scales, they reveal that both species can cope with OA under optimal temperatures (28°C) by elevating pHcf and aragonite saturation state (Ωcf) in support of calcification. At 31°C, neither species elevated these parameters as they did at 28°C and, likewise, could not maintain substantially positive calcification rates under any pH treatment. These results reveal a previously uncharacterized influence of temperature on coral pHcf regulation-the apparent mechanism behind the negative interaction between thermal stress and OA on coral calcification.
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Affiliation(s)
- Maxence Guillermic
- Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, University of California, Los Angeles, 520 Portola Plaza, Los Angeles, CA 90095, USA.
- Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive E, Los Angeles, CA 90095, USA
- Institut Universitaire Européen de la Mer, LGO, Rue Dumont d'Urville, Université de Brest Occidentale, 29280, Plouzané, France
| | - Louise P Cameron
- Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, 430 Nahant Rd, Nahant, MA 01908, USA
- McLean Laboratory, Woods Hole Oceanographic Institution,360 Woods Hole Rd, Falmouth, MA 02543, USA
- The Leibniz Centre for Tropical Marine Research (ZMT), Fahrenheitstraße 6, 28359 Bremen, Germany
| | - Ilian De Corte
- Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, University of California, Los Angeles, 520 Portola Plaza, Los Angeles, CA 90095, USA
- Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive E, Los Angeles, CA 90095, USA
| | - Sambuddha Misra
- Centre for Earth Sciences, Indian Institute of Science, Bengaluru, Karnataka 560012, India
- The Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, UK
| | - Jelle Bijma
- Marine Biogeosciences, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Dirk de Beer
- Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany
| | - Claire E Reymond
- The Leibniz Centre for Tropical Marine Research (ZMT), Fahrenheitstraße 6, 28359 Bremen, Germany
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (CUG), 388 Lumo Rd, Hongshan, Wuhan 430074, P. R. China
| | - Hildegard Westphal
- The Leibniz Centre for Tropical Marine Research (ZMT), Fahrenheitstraße 6, 28359 Bremen, Germany
- Department of Geosciences, Bremen University, 28359 Bremen, Germany
| | - Justin B Ries
- Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, 430 Nahant Rd, Nahant, MA 01908, USA
- The Leibniz Centre for Tropical Marine Research (ZMT), Fahrenheitstraße 6, 28359 Bremen, Germany
| | - Robert A Eagle
- Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, University of California, Los Angeles, 520 Portola Plaza, Los Angeles, CA 90095, USA.
- Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive E, Los Angeles, CA 90095, USA
- Institut Universitaire Européen de la Mer, LGO, Rue Dumont d'Urville, Université de Brest Occidentale, 29280, Plouzané, France
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17
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Abstract
Cilia are evolutionarily conserved organelles that extend from the surface of cells and are found in diverse organisms from protozoans to multicellular organisms. Motile cilia play various biological functions by their beating motion, including mixing fluids and transporting food particles. Non-motile cilia act as sensors that signal cells about their microenvironment. In corals, cilia have been described in some of the cell layers but never in the calcifying epithelium, which is responsible for skeleton formation. In the present study, we used scanning electron microscopy and immunolabelling to investigate the cellular ciliature of the different tissue layers of the coral Stylophora pistillata, with a focus on the calcifying calicoblastic ectoderm. We show that the cilium of the calcifying cells is different from the cilium of the other cell layers. It is much shorter, and more importantly, its base is structurally distinct from the base observed in cilia of the other tissue layers. Based on these structural observations, we conclude that the cilium of the calcifying cells is a primary cilium. From what is known in other organisms, primary cilia are sensors that signal cells about their microenvironment. We discuss the implications of the presence of a primary cilium in the calcifying epithelium for our understanding of the cellular physiology driving coral calcification and its environmental sensitivity.
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Affiliation(s)
- Eric Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1°, 98000, Monaco, Monaco
| | - Philippe Ganot
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1°, 98000, Monaco, Monaco
| | - Alexander A Venn
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1°, 98000, Monaco, Monaco
| | - Sylvie Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1°, 98000, Monaco, Monaco.
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18
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Sun CY, Stifler CA, Chopdekar RV, Schmidt CA, Parida G, Schoeppler V, Fordyce BI, Brau JH, Mass T, Tambutté S, Gilbert PUPA. From particle attachment to space-filling coral skeletons. Proc Natl Acad Sci U S A 2020; 117:30159-30170. [PMID: 33188087 PMCID: PMC7720159 DOI: 10.1073/pnas.2012025117] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Reef-building corals and their aragonite (CaCO3) skeletons support entire reef ecosystems, yet their formation mechanism is poorly understood. Here we used synchrotron spectromicroscopy to observe the nanoscale mineralogy of fresh, forming skeletons from six species spanning all reef-forming coral morphologies: Branching, encrusting, massive, and table. In all species, hydrated and anhydrous amorphous calcium carbonate nanoparticles were precursors for skeletal growth, as previously observed in a single species. The amorphous precursors here were observed in tissue, between tissue and skeleton, and at growth fronts of the skeleton, within a low-density nano- or microporous layer varying in thickness from 7 to 20 µm. Brunauer-Emmett-Teller measurements, however, indicated that the mature skeletons at the microscale were space-filling, comparable to single crystals of geologic aragonite. Nanoparticles alone can never fill space completely, thus ion-by-ion filling must be invoked to fill interstitial pores. Such ion-by-ion diffusion and attachment may occur from the supersaturated calcifying fluid known to exist in corals, or from a dense liquid precursor, observed in synthetic systems but never in biogenic ones. Concomitant particle attachment and ion-by-ion filling was previously observed in synthetic calcite rhombohedra, but never in aragonite pseudohexagonal prisms, synthetic or biogenic, as observed here. Models for biomineral growth, isotope incorporation, and coral skeletons' resilience to ocean warming and acidification must take into account the dual formation mechanism, including particle attachment and ion-by-ion space filling.
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Affiliation(s)
- Chang-Yu Sun
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Cayla A Stifler
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Rajesh V Chopdekar
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Connor A Schmidt
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Ganesh Parida
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Vanessa Schoeppler
- B CUBE-Center for Molecular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
| | | | - Jack H Brau
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Tali Mass
- Marine Biology Department, University of Haifa, 31905 Haifa, Israel
| | - Sylvie Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 98000 Monaco, Principality of Monaco
| | - Pupa U P A Gilbert
- Department of Physics, University of Wisconsin, Madison, WI 53706;
- Department of Chemistry, University of Wisconsin, Madison, WI 53706
- Department of Geoscience, University of Wisconsin, Madison, WI 53706
- Department of Materials Science, University of Wisconsin, Madison, WI 53706
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19
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Venn AA, Bernardet C, Chabenat A, Tambutté E, Tambutté S. Paracellular transport to the coral calcifying medium: effects of environmental parameters. J Exp Biol 2020; 223:jeb227074. [PMID: 32675232 DOI: 10.1242/jeb.227074] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 07/13/2020] [Indexed: 12/11/2022]
Abstract
Coral calcification relies on the transport of ions and molecules to the extracellular calcifying medium (ECM). Little is known about paracellular transport (via intercellular junctions) in corals and other marine calcifiers. Here, we investigated whether the permeability of the paracellular pathway varied in different environmental conditions in the coral Stylophora pistillata Using the fluorescent dye calcein, we characterised the dynamics of calcein influx from seawater to the ECM and showed that increases in paracellular permeability (leakiness) induced by hyperosmotic treatment could be detected by changes in calcein influx rates. We then used the calcein-imaging approach to investigate the effects of two environmental stressors on paracellular permeability: seawater acidification and temperature change. Under conditions of seawater acidification (pH 7.2) known to depress pH in the ECM and the calcifying cells of S. pistillata, we observed a decrease in half-times of calcein influx, indicating increased paracellular permeability. By contrast, high temperature (31°C) had no effect, whereas low temperature (20°C) caused decreases in paracellular permeability. Overall, our study establishes an approach to conduct further in vivo investigation of paracellular transport and suggests that changes in paracellular permeability could form an uncharacterised aspect of the physiological response of S. pistillata to seawater acidification.
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Affiliation(s)
- Alexander A Venn
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, 98000 Monaco
| | - Coralie Bernardet
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, 98000 Monaco
| | - Apolline Chabenat
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, 98000 Monaco
| | - Eric Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, 98000 Monaco
| | - Sylvie Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, 98000 Monaco
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20
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Auscavitch SR, Lunden JJ, Barkman A, Quattrini AM, Demopoulos AWJ, Cordes EE. Distribution of deep-water scleractinian and stylasterid corals across abiotic environmental gradients on three seamounts in the Anegada Passage. PeerJ 2020; 8:e9523. [PMID: 32821533 PMCID: PMC7397984 DOI: 10.7717/peerj.9523] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 06/20/2020] [Indexed: 01/04/2023] Open
Abstract
In the Caribbean Basin the distribution and diversity patterns of deep-sea scleractinian corals and stylasterid hydrocorals are poorly known compared to their shallow-water relatives. In this study, we examined species distribution and community assembly patterns of scleractinian and stylasterid corals on three high-profile seamounts within the Anegada Passage, a deep-water throughway linking the Caribbean Sea and western North Atlantic. Using remotely operated vehicle surveys conducted on the E/V Nautilus by the ROV Hercules in 2014, we characterized coral assemblages and seawater environmental variables between 162 and 2,157 m on Dog Seamount, Conrad Seamount, and Noroît Seamount. In all, 13 morphospecies of scleractinian and stylasterid corals were identified from video with stylasterids being numerically more abundant than both colonial and solitary scleractinians. Cosmopolitan framework-forming species including Madrepora oculata and Solenosmilia variabilis were present but occurred in patchy distributions among the three seamounts. Framework-forming species occurred at or above the depth of the aragonite saturation horizon with stylasterid hydrocorals being the only coral taxon observed below Ωarag values of 1. Coral assemblage variation was found to be strongly associated with depth and aragonite saturation state, while other environmental variables exerted less influence. This study enhances our understanding of the factors that regulate scleractinian and stylasterid coral distribution in an underreported marginal sea and establishes a baseline for monitoring future environmental changes due to ocean acidification and deoxygenation in the tropical western Atlantic.
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Affiliation(s)
| | - Jay J Lunden
- Department of Biology, Temple University, Philadelphia, PA, USA
| | | | - Andrea M Quattrini
- National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | | | - Erik E Cordes
- Department of Biology, Temple University, Philadelphia, PA, USA
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21
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Laissue PP, Roberson L, Gu Y, Qian C, Smith DJ. Long-term imaging of the photosensitive, reef-building coral Acropora muricata using light-sheet illumination. Sci Rep 2020; 10:10369. [PMID: 32587275 DOI: 10.1038/s41598-020-67144-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 05/28/2020] [Indexed: 12/14/2022] Open
Abstract
Coral reefs are in alarming decline due to climate emergency, pollution and other man-made disturbances. The numerous ecosystem services derived from coral reefs are underpinned by the growth and physical complexity of reef-forming corals. Our knowledge of their fundamental biology is limited by available technology. We need a better understanding of larval settlement and development, skeletogenesis, interactions with pathogens and symbionts, and how this biology interacts with environmental factors such as light exposure, temperature, and ocean acidification. We here focus on a fast-growing key coloniser, Acropora muricata (Linnaeus, 1758). To enable dynamic imaging of this photosensitive organism at different scales, we developed light-sheet illumination for fluorescence microscopy of small coral colonies. Our approach reveals live polyps in previously unseen detail. An imaging range for Acropora muricata with no measurable photodamage is defined based upon polyp expansion, coral tissue reaction, and photobleaching. We quantify polyp retraction as a photosensitive behavioural response and show coral tissue rupture at higher irradiance with blue light. The simple and flexible technique enables non-invasive continuous dynamic imaging of highly photosensitive organisms with sizes between 1 mm3 and 5 cm3, for eight hours, at high temporal resolution, on a scale from multiple polyps down to cellular resolution. This live imaging tool opens a new window into the dynamics of reef-building corals.
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22
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Barott KL, Venn AA, Thies AB, Tambutté S, Tresguerres M. Regulation of coral calcification by the acid-base sensing enzyme soluble adenylyl cyclase. Biochem Biophys Res Commun 2020; 525:576-80. [PMID: 32115151 DOI: 10.1016/j.bbrc.2020.02.115] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 02/19/2020] [Indexed: 02/06/2023]
Abstract
Coral calcification is intricately linked to the chemical composition of the fluid in the extracellular calcifying medium (ECM), which is situated between the calcifying cells and the skeleton. Here we demonstrate that the acid-base sensing enzyme soluble adenylyl cyclase (sAC) is expressed in calcifying cells of the coral Stylophora pistillata. Furthermore, pharmacological inhibition of sAC in coral microcolonies resulted in acidification of the ECM as estimated by the pH-sensitive ratiometric indicator SNARF, and decreased calcification rates, as estimated by calcein labeling of crystal growth. These results indicate that sAC activity modulates some of the molecular machinery involved in producing the coral skeleton, which could include ion-transporting proteins and vesicular transport. To our knowledge this is the first study to directly demonstrate biological regulation of the alkaline pH of the coral ECM and its correlation with calcification.
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23
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Ganot P, Tambutté E, Caminiti-Segonds N, Toullec G, Allemand D, Tambutté S. Ubiquitous macropinocytosis in anthozoans. eLife 2020; 9:50022. [PMID: 32039759 PMCID: PMC7032929 DOI: 10.7554/elife.50022] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 02/08/2020] [Indexed: 12/14/2022] Open
Abstract
Transport of fluids, molecules, nutrients or nanoparticles through coral tissues are poorly documented. Here, we followed the flow of various tracers from the external seawater to within the cells of all tissues in living animals. After entering the general coelenteric cavity, we show that nanoparticles disperse throughout the tissues via the paracellular pathway. Then, the ubiquitous entry gate to within the cells' cytoplasm is macropinocytosis. Most cells form large vesicles of 350-600 nm in diameter at their apical side, continuously internalizing their surrounding medium. Macropinocytosis was confirmed using specific inhibitors of PI3K and actin polymerization. Nanoparticle internalization dynamics is size dependent and differs between tissues. Furthermore, we reveal that macropinocytosis is likely a major endocytic pathway in other anthozoan species. The fact that nearly all cells of an animal are continuously soaking in the environment challenges many aspects of the classical physiology viewpoints acquired from the study of bilaterians.
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Affiliation(s)
- Philippe Ganot
- Marine Biology Department, Centre Scientifique de Monaco, Monaco, Monaco
| | - Eric Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, Monaco, Monaco
| | | | - Gaëlle Toullec
- Marine Biology Department, Centre Scientifique de Monaco, Monaco, Monaco
| | - Denis Allemand
- Marine Biology Department, Centre Scientifique de Monaco, Monaco, Monaco
| | - Sylvie Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, Monaco, Monaco
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24
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Kroeker KJ, Bell LE, Donham EM, Hoshijima U, Lummis S, Toy JA, Willis-Norton E. Ecological change in dynamic environments: Accounting for temporal environmental variability in studies of ocean change biology. Glob Chang Biol 2020; 26:54-67. [PMID: 31743515 DOI: 10.1111/gcb.14868] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 09/03/2019] [Indexed: 06/10/2023]
Abstract
The environmental conditions in the ocean have long been considered relatively more stable through time compared to the conditions on land. Advances in sensing technologies, however, are increasingly revealing substantial fluctuations in abiotic factors over ecologically and evolutionarily relevant timescales in the ocean, leading to a growing recognition of the dynamism of the marine environment as well as new questions about how this dynamism may influence species' vulnerability to global environmental change. In some instances, the diurnal or seasonal variability in major environmental change drivers, such as temperature, pH and seawater carbonate chemistry, and dissolved oxygen, can exceed the changes expected with continued anthropogenic global change. While ocean global change biologists have begun to experimentally test how variability in environmental conditions mediates species' responses to changes in the mean, the extensive literature on species' adaptations to temporal variability in their environment and the implications of this variability for their evolutionary responses has not been well integrated into the field. Here, we review the physiological mechanisms underlying species' responses to changes in temperature, pCO2 /pH (and other carbonate parameters), and dissolved oxygen, and discuss what is known about behavioral, plastic, and evolutionary strategies for dealing with variable environments. In addition, we discuss how exposure to variability may influence species' responses to changes in the mean conditions and highlight key research needs for ocean global change biology.
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Affiliation(s)
- Kristy J Kroeker
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Lauren E Bell
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Emily M Donham
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Umihiko Hoshijima
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Sarah Lummis
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Jason A Toy
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Ellen Willis-Norton
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, USA
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25
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Drake JL, Mass T, Stolarski J, Von Euw S, van de Schootbrugge B, Falkowski PG. How corals made rocks through the ages. Glob Chang Biol 2020; 26:31-53. [PMID: 31696576 PMCID: PMC6942544 DOI: 10.1111/gcb.14912] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 10/28/2019] [Accepted: 10/30/2019] [Indexed: 05/03/2023]
Abstract
Hard, or stony, corals make rocks that can, on geological time scales, lead to the formation of massive reefs in shallow tropical and subtropical seas. In both historical and contemporary oceans, reef-building corals retain information about the marine environment in their skeletons, which is an organic-inorganic composite material. The elemental and isotopic composition of their skeletons is frequently used to reconstruct the environmental history of Earth's oceans over time, including temperature, pH, and salinity. Interpretation of this information requires knowledge of how the organisms formed their skeletons. The basic mechanism of formation of calcium carbonate skeleton in stony corals has been studied for decades. While some researchers consider coral skeletons as mainly passive recorders of ocean conditions, it has become increasingly clear that biological processes play key roles in the biomineralization mechanism. Understanding the role of the animal in living stony coral biomineralization and how it evolved has profound implications for interpreting environmental signatures in fossil corals to understand past ocean conditions. Here we review historical hypotheses and discuss the present understanding of how corals evolved and how their skeletons changed over geological time. We specifically explain how biological processes, particularly those occurring at the subcellular level, critically control the formation of calcium carbonate structures. We examine the different models that address the current debate including the tissue-skeleton interface, skeletal organic matrix, and biomineralization pathways. Finally, we consider how understanding the biological control of coral biomineralization is critical to informing future models of coral vulnerability to inevitable global change, particularly increasing ocean acidification.
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Affiliation(s)
- Jeana L Drake
- Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA, USA
| | - Tali Mass
- Department of Marine Biology, The Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
| | | | - Stanislas Von Euw
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | | | - Paul G Falkowski
- Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, USA
- Department of Earth and Planetary Sciences, Rutgers University, New Brunswick, NJ, USA
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26
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Bernardet C, Tambutté E, Techer N, Tambutté S, Venn AA. Ion transporter gene expression is linked to the thermal sensitivity of calcification in the reef coral Stylophora pistillata. Sci Rep 2019; 9:18676. [PMID: 31822787 PMCID: PMC6904480 DOI: 10.1038/s41598-019-54814-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 10/21/2019] [Indexed: 12/22/2022] Open
Abstract
Coral calcification underpins biodiverse reef ecosystems, but the physiology underlying the thermal sensitivity of corals to changing seawater temperatures remains unclear. Furthermore, light is also a key factor in modulating calcification rates, but a mechanistic understanding of how light interacts with temperature to affect coral calcification is lacking. Here, we characterized the thermal performance curve (TPC) of calcification of the wide-spread, model coral species Stylophora pistillata, and used gene expression analysis to investigate the role of ion transport mechanisms in thermally-driven declines in day and nighttime calcification. Focusing on genes linked to transport of dissolved inorganic carbon (DIC), calcium and H+, our study reveals a high degree of coherence between physiological responses (e.g. calcification and respiration) with distinct gene expression patterns to the different temperatures in day and night conditions. At low temperatures, calcification and gene expression linked to DIC transport processes were downregulated, but showed little response to light. By contrast, at elevated temperature, light had a positive effect on calcification and stimulated a more functionally diverse gene expression response of ion transporters. Overall, our findings highlight the role of mechanisms linked to DIC, calcium and H+ transport in the thermal sensitivity of coral calcification and how this sensitivity is influenced by light.
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Affiliation(s)
- C Bernardet
- Centre Scientifique de Monaco, Marine Biology Department, 8 Quai Antoine 1er, Monaco, 98000, Monaco
- Sorbonne Université, Collège Doctoral, F-75005, Paris, France
| | - E Tambutté
- Centre Scientifique de Monaco, Marine Biology Department, 8 Quai Antoine 1er, Monaco, 98000, Monaco
| | | | - S Tambutté
- Centre Scientifique de Monaco, Marine Biology Department, 8 Quai Antoine 1er, Monaco, 98000, Monaco
| | - A A Venn
- Centre Scientifique de Monaco, Marine Biology Department, 8 Quai Antoine 1er, Monaco, 98000, Monaco.
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27
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Pernice M, Raina JB, Rädecker N, Cárdenas A, Pogoreutz C, Voolstra CR. Down to the bone: the role of overlooked endolithic microbiomes in reef coral health. ISME J 2019; 14:325-334. [PMID: 31690886 PMCID: PMC6976677 DOI: 10.1038/s41396-019-0548-z] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 10/17/2019] [Accepted: 10/28/2019] [Indexed: 01/10/2023]
Abstract
Reef-building corals harbour an astonishing diversity of microorganisms, including endosymbiotic microalgae, bacteria, archaea, and fungi. The metabolic interactions within this symbiotic consortium are fundamental to the ecological success of corals and the unique productivity of coral reef ecosystems. Over the last two decades, scientific efforts have been primarily channelled into dissecting the symbioses occurring in coral tissues. Although easily accessible, this compartment is only 2–3 mm thick, whereas the underlying calcium carbonate skeleton occupies the vast internal volume of corals. Far from being devoid of life, the skeleton harbours a wide array of algae, endolithic fungi, heterotrophic bacteria, and other boring eukaryotes, often forming distinct bands visible to the bare eye. Some of the critical functions of these endolithic microorganisms in coral health, such as nutrient cycling and metabolite transfer, which could enable the survival of corals during thermal stress, have long been demonstrated. In addition, some of these microorganisms can dissolve calcium carbonate, weakening the coral skeleton and therefore may play a major role in reef erosion. Yet, experimental data are wanting due to methodological limitations. Recent technological and conceptual advances now allow us to tease apart the complex physical, ecological, and chemical interactions at the heart of coral endolithic microbial communities. These new capabilities have resulted in an excellent body of research and provide an exciting outlook to further address the functional microbial ecology of the “overlooked” coral skeleton.
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Affiliation(s)
- Mathieu Pernice
- Climate Change Cluster, University of Technology Sydney, Sydney, NSW, Australia
| | - Jean-Baptiste Raina
- Climate Change Cluster, University of Technology Sydney, Sydney, NSW, Australia.
| | - Nils Rädecker
- Red Sea Research Center, Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.,Department of Biology, University of Konstanz, 78457, Konstanz, Germany
| | - Anny Cárdenas
- Red Sea Research Center, Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.,Department of Biology, University of Konstanz, 78457, Konstanz, Germany
| | - Claudia Pogoreutz
- Red Sea Research Center, Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.,Department of Biology, University of Konstanz, 78457, Konstanz, Germany
| | - Christian R Voolstra
- Red Sea Research Center, Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia. .,Department of Biology, University of Konstanz, 78457, Konstanz, Germany.
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28
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Neder M, Laissue PP, Akiva A, Akkaynak D, Albéric M, Spaeker O, Politi Y, Pinkas I, Mass T. Mineral formation in the primary polyps of pocilloporoid corals. Acta Biomater 2019; 96:631-645. [PMID: 31302296 DOI: 10.1016/j.actbio.2019.07.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 06/18/2019] [Accepted: 07/09/2019] [Indexed: 02/07/2023]
Abstract
In reef-building corals, larval settlement and its rapid calcification provides a unique opportunity to study the bio-calcium carbonate formation mechanism involving skeleton morphological changes. Here we investigate the mineral formation of primary polyps, just after settlement, in two species of the pocilloporoid corals: Stylophora pistillata (Esper, 1797) and Pocillopora acuta (Lamarck, 1816). We show that the initial mineral phase is nascent Mg-Calcite, with rod-like morphology in P. acuta, and dumbbell morphology in S. pistillata. These structures constitute the first layer of the basal plate which is comparable to Rapid Accretion Deposits (Centers of Calcification, CoC) in adult coral skeleton. We found also that the rod-like/dumbbell Mg-Calcite structures in subsequent growth step will merge into larger aggregates by deposition of aragonite needles. Our results suggest that a biologically controlled mineralization of initial skeletal deposits occurs in three steps: first, vesicles filled with divalent ions are formed intracellularly. These vesicles are then transferred to the calcification site, forming nascent Mg-Calcite rod/pristine dumbbell structures. During the third step, aragonite crystals develop between these structures forming spherulite-like aggregates. STATEMENT OF SIGNIFICANCE: Coral settlement and recruitment periods are highly sensitive to environmental conditions. Successful mineralization during these periods is vital and influences the coral's chances of survival. Therefore, understanding the exact mechanism underlying carbonate precipitation is highly important. Here, we used in vivo microscopy, spectroscopy and molecular methods to provide new insights into mineral development. We show that the primary polyp's mineral arsenal consists of two types of minerals: Mg-Calcite and aragonite. In addition, we provide new insights into the ion pathway by showing that divalent ions are concentrated in intracellular vesicles and are eventually deposited at the calcification site.
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Affiliation(s)
- Maayan Neder
- Department of Marine Biology, The Leon H. Charney School of Marine Sciences, University of Haifa, Mt. Carmel, Haifa 3498838, Israel; The Interuniversity Institute of Marine Sciences, Eilat 88103, Israel
| | | | - Anat Akiva
- Laboratory of Materials and Interface Chemistry and Center for Multiscale Electron Microscopy, Department of Chemical Engineering and Chemistry and Institute for Complex Molecular Systems, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Derya Akkaynak
- The Interuniversity Institute of Marine Sciences, Eilat 88103, Israel; Department of Marine Technologies, The Leon H. Charney School of Marine Sciences, University of Haifa, Mt. Carmel, Haifa 3498838, Israel
| | - Marie Albéric
- Max-Planck Institute of Colloids and Interfaces, Potsdam-Golm 14476, Germany
| | - Oliver Spaeker
- Max-Planck Institute of Colloids and Interfaces, Potsdam-Golm 14476, Germany
| | - Yael Politi
- Max-Planck Institute of Colloids and Interfaces, Potsdam-Golm 14476, Germany
| | - Iddo Pinkas
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 7610001, Israel.
| | - Tali Mass
- Department of Marine Biology, The Leon H. Charney School of Marine Sciences, University of Haifa, Mt. Carmel, Haifa 3498838, Israel.
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29
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DeCarlo TM, Comeau S, Cornwall CE, Gajdzik L, Guagliardo P, Sadekov A, Thillainath EC, Trotter J, McCulloch MT. Investigating marine bio-calcification mechanisms in a changing ocean with in vivo and high-resolution ex vivo Raman spectroscopy. Glob Chang Biol 2019; 25:1877-1888. [PMID: 30689259 PMCID: PMC6916197 DOI: 10.1111/gcb.14579] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 01/20/2019] [Accepted: 01/21/2019] [Indexed: 05/20/2023]
Abstract
Ocean acidification poses a serious threat to marine calcifying organisms, yet experimental and field studies have found highly diverse responses among species and environments. Our understanding of the underlying drivers of differential responses to ocean acidification is currently limited by difficulties in directly observing and quantifying the mechanisms of bio-calcification. Here, we present Raman spectroscopy techniques for characterizing the skeletal mineralogy and calcifying fluid chemistry of marine calcifying organisms such as corals, coralline algae, foraminifera, and fish (carbonate otoliths). First, our in vivo Raman technique is the ideal tool for investigating non-classical mineralization pathways. This includes calcification by amorphous particle attachment, which has recently been controversially suggested as a mechanism by which corals resist the negative effects of ocean acidification. Second, high-resolution ex vivo Raman mapping reveals complex banding structures in the mineralogy of marine calcifiers, and provides a tool to quantify calcification responses to environmental variability on various timescales from days to years. We describe the new insights into marine bio-calcification that our techniques have already uncovered, and we consider the wide range of questions regarding calcifier responses to global change that can now be proposed and addressed with these new Raman spectroscopy tools.
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Affiliation(s)
- Thomas M. DeCarlo
- Oceans Graduate SchoolThe University of Western AustraliaCrawleyWestern AustraliaAustralia
- Oceans Institute at The University of Western AustraliaCrawleyWestern AustraliaAustralia
- ARC Centre of Excellence for Coral Reef StudiesCrawleyWestern AustraliaAustralia
| | - Steeve Comeau
- Oceans Graduate SchoolThe University of Western AustraliaCrawleyWestern AustraliaAustralia
- Oceans Institute at The University of Western AustraliaCrawleyWestern AustraliaAustralia
- ARC Centre of Excellence for Coral Reef StudiesCrawleyWestern AustraliaAustralia
- Present address:
Sorbonne Université, CNRS‐INSU, Laboratoire d'Océanographie de 30 Villefranche181 chemin du Lazaret, F–06230 Villefranche‐sur‐merFrance
| | - Christopher E. Cornwall
- Oceans Graduate SchoolThe University of Western AustraliaCrawleyWestern AustraliaAustralia
- Oceans Institute at The University of Western AustraliaCrawleyWestern AustraliaAustralia
- ARC Centre of Excellence for Coral Reef StudiesCrawleyWestern AustraliaAustralia
- Present address:
School of Biological SciencesVictoria University of WellingtonWellingtonNew‐Zealand
| | - Laura Gajdzik
- School of Molecular and Life Sciences, TrEnD LaboratoryCurtin UniversityBentleyWestern AustraliaAustralia
| | - Paul Guagliardo
- Centre for Microscopy, Characterisation and AnalysisThe University of Western AustraliaCrawleyWestern AustraliaAustralia
| | - Aleksey Sadekov
- Oceans Graduate SchoolThe University of Western AustraliaCrawleyWestern AustraliaAustralia
- Oceans Institute at The University of Western AustraliaCrawleyWestern AustraliaAustralia
- ARC Centre of Excellence for Coral Reef StudiesCrawleyWestern AustraliaAustralia
| | - Emma C. Thillainath
- Oceans Institute at The University of Western AustraliaCrawleyWestern AustraliaAustralia
- School of Biological SciencesThe University of Western AustraliaCrawleyWestern AustraliaAustralia
| | - Julie Trotter
- Oceans Institute at The University of Western AustraliaCrawleyWestern AustraliaAustralia
- School of Earth SciencesThe University of Western AustraliaCrawleyWestern AustraliaAustralia
| | - Malcolm T. McCulloch
- Oceans Graduate SchoolThe University of Western AustraliaCrawleyWestern AustraliaAustralia
- Oceans Institute at The University of Western AustraliaCrawleyWestern AustraliaAustralia
- ARC Centre of Excellence for Coral Reef StudiesCrawleyWestern AustraliaAustralia
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30
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DeCarlo TM, Comeau S, Cornwall CE, McCulloch MT. Coral resistance to ocean acidification linked to increased calcium at the site of calcification. Proc Biol Sci 2019; 285:rspb.2018.0564. [PMID: 29720418 DOI: 10.1098/rspb.2018.0564] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 04/09/2018] [Indexed: 11/12/2022] Open
Abstract
Ocean acidification threatens the persistence of biogenic calcium carbonate (CaCO3) production on coral reefs. However, some coral genera show resistance to declines in seawater pH, potentially achieved by modulating the chemistry of the fluid where calcification occurs. We use two novel geochemical techniques based on boron systematics and Raman spectroscopy, which together provide the first constraints on the sensitivity of coral calcifying fluid calcium concentrations ([Formula: see text]) to changing seawater pH. In response to simulated end-of-century pH conditions, Pocillopora damicornis increased [Formula: see text] to as much as 25% above that of seawater and maintained constant calcification rates. Conversely, Acropora youngei displayed less control over [Formula: see text], and its calcification rates strongly declined at lower seawater pH. Although the role of [Formula: see text] in driving calcification has often been neglected, increasing [Formula: see text] may be a key mechanism enabling more resistant corals to cope with ocean acidification and continue to build CaCO3 skeletons in a high-CO2 world.
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Affiliation(s)
- T M DeCarlo
- Oceans Institute and Oceans Graduate School, The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia .,ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia
| | - S Comeau
- Oceans Institute and Oceans Graduate School, The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia.,ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia
| | - C E Cornwall
- Oceans Institute and Oceans Graduate School, The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia.,ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia
| | - M T McCulloch
- Oceans Institute and Oceans Graduate School, The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia.,ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia
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31
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Venn AA, Tambutté E, Caminiti-Segonds N, Techer N, Allemand D, Tambutté S. Effects of light and darkness on pH regulation in three coral species exposed to seawater acidification. Sci Rep 2019; 9:2201. [PMID: 30778093 DOI: 10.1038/s41598-018-38168-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 12/20/2018] [Indexed: 02/07/2023] Open
Abstract
The resilience of corals to ocean acidification has been proposed to rely on regulation of extracellular calcifying medium pH (pHECM), but few studies have compared the capacity of coral species to control this parameter at elevated pCO2. Furthermore, exposure to light and darkness influences both pH regulation and calcification in corals, but little is known about its effect under conditions of seawater acidification. Here we investigated the effect of acidification in light and darkness on pHECM, calcifying cell intracellular pH (pHI), calcification, photosynthesis and respiration in three coral species: Stylophora pistillata, Pocillopora damicornis and Acropora hyacinthus. We show that S. pistillata was able to maintain pHECM under acidification in light and darkness, but pHECM decreased in P. damicornis and A. hyacinthus to a much greater extent in darkness than in the light. Acidification depressed calcifying cell pHI in all three species, but we identified an unexpected positive effect of light on pHI. Calcification rate and pHECM decreased together under acidification, but there are inconsistencies in their relationship indicating that other physiological parameters are likely to shape how coral calcification responds to acidification. Overall our study reveals interspecies differences in coral regulation of pHECM and pHI when exposed to acidification, influenced by exposure to light and darkness.
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32
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Taubner I, Hu MY, Eisenhauer A, Bleich M. Electrophysiological evidence for light-activated cation transport in calcifying corals. Proc Biol Sci 2019; 286:20182444. [PMID: 30963934 PMCID: PMC6408601 DOI: 10.1098/rspb.2018.2444] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 01/23/2019] [Indexed: 12/17/2022] Open
Abstract
Light has been demonstrated to enhance calcification rates in hermatypic coral species. To date, it remains unresolved whether calcifying epithelia change their ion transport activity during illumination, and whether such a process is mediated by the endosymbiotic algae or can be controlled by the coral host itself. Using a modified Ussing chamber in combination with H+ sensitive microelectrode measurements, the present work demonstrates that light triggers the generation of a skeleton positive potential of up to 0.9 mV in the hermatypic coral Stylophora pistillata. This potential is generated by a net flux of cations towards the skeleton and reaches its maximum at blue (450 nm) light. The effects of pharmacological inhibitors targeting photosynthesis 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and anion transport 4,4'-diisothiocyano-2,2'-stilbenedisulfonic acid (DIDS) were investigated by pH microelectrode measurements in coral tissues demonstrating a rapid decrease in tissue pH under illumination. However, these inhibitors showed no effect on the electrophysiological light response of the coral host. By contrast, metabolic inhibition by cyanide and deoxyglucose reversibly inhibited the light-induced cation flux towards the skeleton. These results suggest that ion transport across coral epithelia is directly triggered by blue light, independent of photosynthetic activity of algal endosymbionts. Measurements of this very specific and quantifiable physiological response can provide parameters to identify photoreception mechanisms and will help to broaden our understanding of the mechanistic link between light stimulation and epithelial ion transport, potentially relevant for calcification in hermatypic corals.
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Affiliation(s)
- Isabelle Taubner
- Christian-Albrechts-Universität, Institute of Physiology, Kiel, Germany
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - Marian Y. Hu
- Christian-Albrechts-Universität, Institute of Physiology, Kiel, Germany
| | | | - Markus Bleich
- Christian-Albrechts-Universität, Institute of Physiology, Kiel, Germany
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Abstract
Scleractinian corals promote the precipitation of their carbonate skeleton by elevating the pH and dissolved inorganic carbon (DIC) concentration of their calcifying fluid above that of seawater. The fact corals actively regulate their calcifying fluid chemistry implies the potential for acclimation to ocean acidification. However, the extent to which corals can adjust their regulation mechanism in the face of decreasing ocean pH has not been rigorously tested. Here I present a numerical model simulating pH and DIC up-regulation by corals, and use it to determine the relative importance of physiological regulation versus seawater conditions in controlling coral calcifying fluid chemistry. I show that external seawater temperature and buffering capacity exert the first-order control on the extent of pH elevation in the calcifying fluid and explain most of the observed inter- and intra-species variability. Conversely, physiological regulation, represented by the interplay between enzymatic proton pumping, carbon influx and the exchange of calcifying fluid with external seawater, contributes to some variability but remain relatively constant as seawater conditions change. The model quantitatively reproduces variations of calcifying fluid pH in natural Porites colonies, and predicts an average 0.16 unit decrease in Porites calcifying fluid pH, i.e., ~43% increase in H+ concentration, by the end of this century as a combined result of projected ocean warming and acidification, highlighting the susceptibility of coral calcification to future changes in ocean conditions. In addition, my findings support the development of coral-based seawater pH proxies, but suggest the influences of physicochemical and biological factors other than seawater pH must be considered.
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Affiliation(s)
- Weifu Guo
- Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, 02543, USA.
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34
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Ross CL, DeCarlo TM, McCulloch MT. Environmental and physiochemical controls on coral calcification along a latitudinal temperature gradient in Western Australia. Glob Chang Biol 2019; 25:431-447. [PMID: 30456772 DOI: 10.1111/gcb.14488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Revised: 08/12/2018] [Accepted: 09/19/2018] [Indexed: 06/09/2023]
Abstract
The processes that occur at the micro-scale site of calcification are fundamental to understanding the response of coral growth in a changing world. However, our mechanistic understanding of chemical processes driving calcification is still evolving. Here, we report the results of a long-term in situ study of coral calcification rates, photo-physiology, and calcifying fluid (cf) carbonate chemistry (using boron isotopes, elemental systematics, and Raman spectroscopy) for seven species (four genera) of symbiotic corals growing in their natural environments at tropical, subtropical, and temperate locations in Western Australia (latitudinal range of ~11°). We find that changes in net coral calcification rates are primarily driven by pHcf and carbonate ion concentration [ CO 3 2 - ]cf in conjunction with temperature and DICcf . Coral pHcf varies with latitudinal and seasonal changes in temperature and works together with the seasonally varying DICcf to optimize [ CO 3 2 - ]cf at species-dependent levels. Our results indicate that corals shift their pHcf to adapt and/or acclimatize to their localized thermal regimes. This biological response is likely to have critical implications for predicting the future of coral reefs under CO2 -driven warming and acidification.
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Affiliation(s)
- Claire L Ross
- School of Earth Sciences, The University of Western Australia, Crawley, Western Australia, Australia
- Oceans Institute, The University of Western Australia, Crawley, Western Australia, Australia
- ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, Crawley, Western Australia, Australia
| | - Thomas M DeCarlo
- Oceans Institute, The University of Western Australia, Crawley, Western Australia, Australia
- ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, Crawley, Western Australia, Australia
- Oceans Graduate School, The University of Western Australia, Crawley, Western Australia, Australia
| | - Malcolm T McCulloch
- Oceans Institute, The University of Western Australia, Crawley, Western Australia, Australia
- ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, Crawley, Western Australia, Australia
- Oceans Graduate School, The University of Western Australia, Crawley, Western Australia, Australia
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35
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Sevilgen DS, Venn AA, Hu MY, Tambutté E, de Beer D, Planas-Bielsa V, Tambutté S. Full in vivo characterization of carbonate chemistry at the site of calcification in corals. Sci Adv 2019; 5:eaau7447. [PMID: 30746460 PMCID: PMC6357752 DOI: 10.1126/sciadv.aau7447] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 12/04/2018] [Indexed: 05/20/2023]
Abstract
Reef-building corals form their calcium carbonate skeletons within an extracellular calcifying medium (ECM). Despite the critical role of the ECM in coral calcification, ECM carbonate chemistry is poorly constrained in vivo, and full ECM carbonate chemistry has never been characterized based solely on direct in vivo measurements. Here, we measure pHECM in the growing edge of Stylophora pistillata by simultaneously using microsensors and the fluorescent dye SNARF-1, showing that, when measured at the same time and place, the results agree. We then conduct microscope-guided microsensor measurements of pH, [Ca2+], and [CO3 2-] in the ECM and, from this, determine [DIC]ECM and aragonite saturation state (Ωarag), showing that all parameters are elevated with respect to the surrounding seawater. Our study provides the most complete in vivo characterization of ECM carbonate chemistry parameters in a coral species to date, pointing to the key role of calcium- and carbon-concentrating mechanisms in coral calcification.
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Affiliation(s)
- Duygu S. Sevilgen
- Centre Scientifique de Monaco, Marine Biology Department, 8 Quai Antoine 1er, MC 98000 Monaco, Monaco
- Corresponding author. (S.T.); (D.S.S.)
| | - Alexander A. Venn
- Centre Scientifique de Monaco, Marine Biology Department, 8 Quai Antoine 1er, MC 98000 Monaco, Monaco
| | - Marian Y. Hu
- Christian-Albrechts-Universität zu Kiel, Hermann-Rodewald-Straße 5, DE 24118 Kiel, Germany
| | - Eric Tambutté
- Centre Scientifique de Monaco, Marine Biology Department, 8 Quai Antoine 1er, MC 98000 Monaco, Monaco
| | - Dirk de Beer
- Max Planck Institute for Marine Microbiology, Celsiusstr. 1, DE 28359 Bremen, Germany
| | - Víctor Planas-Bielsa
- Centre Scientifique de Monaco, Polar Biology Department, 8 Quai Antoine 1er, MC 98000 Monaco, Monaco
- Laboratoire International Associé LIA 647 BioSensib (CSM-CNRS-Unistra), 8 Quai Antoine 1er, MC 98000 Monaco, Monaco
| | - Sylvie Tambutté
- Centre Scientifique de Monaco, Marine Biology Department, 8 Quai Antoine 1er, MC 98000 Monaco, Monaco
- Corresponding author. (S.T.); (D.S.S.)
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36
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Kornder NA, Riegl BM, Figueiredo J. Thresholds and drivers of coral calcification responses to climate change. Glob Chang Biol 2018; 24:5084-5095. [PMID: 30152194 DOI: 10.1111/gcb.14431] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 06/15/2018] [Accepted: 08/06/2018] [Indexed: 06/08/2023]
Abstract
Increased temperature and CO2 levels are considered key drivers of coral reef degradation. However, individual assessments of ecological responses (calcification) to these stressors are often contradicting. To detect underlying drivers of heterogeneity in coral calcification responses, we developed a procedure for the inclusion of stress-effect relationships in ecological meta-analyses. We applied this technique to a dataset of 294 empirical observations from 62 peer-reviewed publications testing individual and combined effects of elevated temperature and pCO2 on coral calcification. Our results show an additive interaction between warming and acidification, which reduces coral calcification by 20% when pCO2 levels exceed 700 ppm and temperature increases by 3°C. However, stress levels varied among studies and significantly affected outcomes, with unaffected calcification rates under moderate stresses (pCO2 ≤ 700 ppm, ΔT < 3°C). Future coral reef carbon budgets will therefore depend on the magnitude of pCO2 and temperature elevations and, thus, anthropogenic CO2 emissions. Accounting for stress-effect relationships enabled us to identify additional drivers of heterogeneity including coral taxa, life stage, habitat, food availability, climate, and season. These differences can aid reef management identifying refuges and conservation priorities, but without a global effort to reduce CO2 emissions, coral capacity to build reefs will be at risk.
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Affiliation(s)
- Niklas A Kornder
- Department of Freshwater and Marine Ecology, Institute of Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands
- Halmos College of Natural Science and Oceanography, Nova Southeastern University, Dania Beach, Florida
| | - Bernhard M Riegl
- Halmos College of Natural Science and Oceanography, Nova Southeastern University, Dania Beach, Florida
| | - Joana Figueiredo
- Halmos College of Natural Science and Oceanography, Nova Southeastern University, Dania Beach, Florida
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37
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Abstract
Reef-building corals provide the foundation for the structural and biological diversity of coral-reef ecosystems. These massive biological structures, which can be seen from space, are the culmination of complex interactions between the tiny polyps of the coral animal in concert with its unicellular symbiotic algae and a wide diversity of closely associated microorganisms (bacteria, archaea, fungi, and viruses). While reef-building corals have persisted in various forms for over 200 million years, human-induced conditions threaten their function and persistence. The scope for loss associated with the destruction of coral reef systems is economically, biologically, physically and culturally immense. Here, we provide a micro-to-macro perspective on the biology of scleractinian corals and discuss how cellular processes of the host and symbionts potentially affect the response of these reef builders to the wide variety of both natural and anthropogenic stressors encountered by corals in the Anthropocene. We argue that the internal physicochemical settings matter to both the performance of the host and microbiome, as bio-physical feedbacks may enhance stress tolerance through environmentally mediated host priming and effects on microbiome ecological and evolutionary dynamics.
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Affiliation(s)
- Hollie M Putnam
- University of Rhode Island, Department of Biological Sciences, Kingston, RI, USA.
| | - Katie L Barott
- University of Pennsylvania, Department of Biology, Philadelphia, PA, USA; Hawaii Institute for Marine Biology, University of Hawai'i, Manoa, HI, USA
| | - Tracy D Ainsworth
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Australia
| | - Ruth D Gates
- Hawaii Institute for Marine Biology, University of Hawai'i, Manoa, HI, USA
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38
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Barott KL, Barron ME, Tresguerres M. Identification of a molecular pH sensor in coral. Proc Biol Sci 2018; 284:rspb.2017.1769. [PMID: 29093223 DOI: 10.1098/rspb.2017.1769] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 10/04/2017] [Indexed: 12/26/2022] Open
Abstract
Maintaining stable intracellular pH (pHi) is essential for homeostasis, and requires the ability to both sense pH changes that may result from internal and external sources, and to regulate downstream compensatory pH pathways. Here we identified the cAMP-producing enzyme soluble adenylyl cyclase (sAC) as the first molecular pH sensor in corals. sAC protein was detected throughout coral tissues, including those involved in symbiosis and calcification. Application of a sAC-specific inhibitor caused significant and reversible pHi acidosis in isolated coral cells under both dark and light conditions, indicating sAC is essential for sensing and regulating pHi perturbations caused by respiration and photosynthesis. Furthermore, pHi regulation during external acidification was also dependent on sAC activity. Thus, sAC is a sensor and regulator of pH disturbances from both metabolic and external origin in corals. Since sAC is present in all coral cell types, and the cAMP pathway can regulate virtually every aspect of cell physiology through post-translational modifications of proteins, sAC is likely to trigger multiple homeostatic mechanisms in response to pH disturbances. This is also the first evidence that sAC modulates pHi in any non-mammalian animal. Since corals are basal metazoans, our results indicate this function is evolutionarily conserved across animals.
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Affiliation(s)
- Katie L Barott
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA.,Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Megan E Barron
- Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Martin Tresguerres
- Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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39
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Ross CL, Schoepf V, DeCarlo TM, McCulloch MT. Mechanisms and seasonal drivers of calcification in the temperate coral Turbinaria reniformis at its latitudinal limits. Proc Biol Sci 2018; 285:rspb.2018.0215. [PMID: 29794042 DOI: 10.1098/rspb.2018.0215] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Accepted: 04/25/2018] [Indexed: 11/12/2022] Open
Abstract
High-latitude coral reefs provide natural laboratories for investigating the mechanisms and limits of coral calcification. While the calcification processes of tropical corals have been studied intensively, little is known about how their temperate counterparts grow under much lower temperature and light conditions. Here, we report the results of a long-term (2-year) study of seasonal changes in calcification rates, photo-physiology and calcifying fluid (cf) chemistry (using boron isotope systematics and Raman spectroscopy) for the coral Turbinaria reniformis growing near its latitudinal limits (34.5° S) along the southern coast of Western Australia. In contrast with tropical corals, calcification rates were found to be threefold higher during winter (16 to 17° C) compared with summer (approx. 21° C), and negatively correlated with light, but lacking any correlation with temperature. These unexpected findings are attributed to a combination of higher chlorophyll a, and hence increased heterotrophy during winter compared with summer, together with the corals' ability to seasonally modulate pHcf, with carbonate ion concentration [Formula: see text] being the main controller of calcification rates. Conversely, calcium ion concentration [Ca2+]cf declined with increasing calcification rates, resulting in aragonite saturation states Ωcf that were stable yet elevated fourfold above seawater values. Our results show that corals growing near their latitudinal limits exert strong physiological control over their cf in order to maintain year-round calcification rates that are insensitive to the unfavourable temperature regimes typical of high-latitude reefs.
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Affiliation(s)
- Claire L Ross
- Oceans Institute and School of Earth Sciences, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia .,ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia
| | - Verena Schoepf
- Oceans Institute and School of Earth Sciences, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia.,ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia
| | - Thomas M DeCarlo
- Oceans Institute and School of Earth Sciences, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia.,ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia
| | - Malcolm T McCulloch
- Oceans Institute and School of Earth Sciences, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia.,ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia
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40
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Mollica NR, Guo W, Cohen AL, Huang KF, Foster GL, Donald HK, Solow AR. Ocean acidification affects coral growth by reducing skeletal density. Proc Natl Acad Sci U S A 2018; 115:1754-9. [PMID: 29378969 DOI: 10.1073/pnas.1712806115] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Ocean acidification (OA) is considered an important threat to coral reef ecosystems, because it reduces the availability of carbonate ions that reef-building corals need to produce their skeletons. However, while theory predicts that coral calcification rates decline as carbonate ion concentrations decrease, this prediction is not consistently borne out in laboratory manipulation experiments or in studies of corals inhabiting naturally low-pH reefs today. The skeletal growth of corals consists of two distinct processes: extension (upward growth) and densification (lateral thickening). Here, we show that skeletal density is directly sensitive to changes in seawater carbonate ion concentration and thus, to OA, whereas extension is not. We present a numerical model of Porites skeletal growth that links skeletal density with the external seawater environment via its influence on the chemistry of coral calcifying fluid. We validate the model using existing coral skeletal datasets from six Porites species collected across five reef sites and use this framework to project the impact of 21st century OA on Porites skeletal density across the global tropics. Our model predicts that OA alone will drive up to 20.3 ± 5.4% decline in the skeletal density of reef-building Porites corals.
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41
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Comeau S, Tambutté E, Carpenter RC, Edmunds PJ, Evensen NR, Allemand D, Ferrier-Pagès C, Tambutté S, Venn AA. Coral calcifying fluid pH is modulated by seawater carbonate chemistry not solely seawater pH. Proc Biol Sci 2018; 284:rspb.2016.1669. [PMID: 28100813 DOI: 10.1098/rspb.2016.1669] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 12/02/2016] [Indexed: 11/12/2022] Open
Abstract
Reef coral calcification depends on regulation of pH in the internal calcifying fluid (CF) in which the coral skeleton forms. However, little is known about calcifying fluid pH (pHCF) regulation, despite its importance in determining the response of corals to ocean acidification. Here, we investigate pHCF in the coral Stylophora pistillata in seawater maintained at constant pH with manipulated carbonate chemistry to alter dissolved inorganic carbon (DIC) concentration, and therefore total alkalinity (AT). We also investigate the intracellular pH of calcifying cells, photosynthesis, respiration and calcification rates under the same conditions. Our results show that despite constant pH in the surrounding seawater, pHCF is sensitive to shifts in carbonate chemistry associated with changes in [DIC] and [AT], revealing that seawater pH is not the sole driver of pHCF Notably, when we synthesize our results with published data, we identify linear relationships of pHCF with the seawater [DIC]/[H+] ratio, [AT]/ [H+] ratio and [[Formula: see text]]. Our findings contribute new insights into the mechanisms determining the sensitivity of coral calcification to changes in seawater carbonate chemistry, which are needed for predicting effects of environmental change on coral reefs and for robust interpretations of isotopic palaeoenvironmental records in coral skeletons.
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Affiliation(s)
- S Comeau
- Department of Biology, California State University, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA .,School of Earth and Environment and ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - E Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, MC98000, Monaco.,Laboratoire International Associé 647 «BIOSENSIB», Centre Scientifique de Monaco-Centre National de la Recherche Scientifique, 8 Quai Antoine 1er, MC98000, Monaco
| | - R C Carpenter
- Department of Biology, California State University, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA
| | - P J Edmunds
- Department of Biology, California State University, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA
| | - N R Evensen
- Department of Biology, California State University, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA.,Marine Spatial Ecology Lab, ARC Centre of Excellence for Coral Reef Studies and School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - D Allemand
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, MC98000, Monaco.,Laboratoire International Associé 647 «BIOSENSIB», Centre Scientifique de Monaco-Centre National de la Recherche Scientifique, 8 Quai Antoine 1er, MC98000, Monaco
| | - C Ferrier-Pagès
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, MC98000, Monaco.,Laboratoire International Associé 647 «BIOSENSIB», Centre Scientifique de Monaco-Centre National de la Recherche Scientifique, 8 Quai Antoine 1er, MC98000, Monaco
| | - S Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, MC98000, Monaco.,Laboratoire International Associé 647 «BIOSENSIB», Centre Scientifique de Monaco-Centre National de la Recherche Scientifique, 8 Quai Antoine 1er, MC98000, Monaco
| | - A A Venn
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine 1er, MC98000, Monaco .,Laboratoire International Associé 647 «BIOSENSIB», Centre Scientifique de Monaco-Centre National de la Recherche Scientifique, 8 Quai Antoine 1er, MC98000, Monaco
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42
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Xu K, Chen H, Wang W, Xu Y, Ji D, Chen C, Xie C. Responses of photosynthesis and CO 2 concentrating mechanisms of marine crop Pyropia haitanensis thalli to large pH variations at different time scales. ALGAL RES 2017. [DOI: 10.1016/j.algal.2017.10.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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43
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Wall CB, Mason RAB, Ellis WR, Cunning R, Gates RD. Elevated pCO 2 affects tissue biomass composition, but not calcification, in a reef coral under two light regimes. R Soc Open Sci 2017; 4:170683. [PMID: 29291059 PMCID: PMC5717633 DOI: 10.1098/rsos.170683] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 09/28/2017] [Indexed: 06/02/2023]
Abstract
Ocean acidification (OA) is predicted to reduce reef coral calcification rates and threaten the long-term growth of coral reefs under climate change. Reduced coral growth at elevated pCO2 may be buffered by sufficiently high irradiances; however, the interactive effects of OA and irradiance on other fundamental aspects of coral physiology, such as the composition and energetics of coral biomass, remain largely unexplored. This study tested the effects of two light treatments (7.5 versus 15.7 mol photons m-2 d-1) at ambient or elevated pCO2 (435 versus 957 µatm) on calcification, photopigment and symbiont densities, biomass reserves (lipids, carbohydrates, proteins), and biomass energy content (kJ) of the reef coral Pocillopora acuta from Kāne'ohe Bay, Hawai'i. While pCO2 and light had no effect on either area- or biomass-normalized calcification, tissue lipids gdw-1 and kJ gdw-1 were reduced 15% and 14% at high pCO2, and carbohydrate content increased 15% under high light. The combination of high light and high pCO2 reduced protein biomass (per unit area) by approximately 20%. Thus, under ecologically relevant irradiances, P. acuta in Kāne'ohe Bay does not exhibit OA-driven reductions in calcification reported for other corals; however, reductions in tissue lipids, energy content and protein biomass suggest OA induced an energetic deficit and compensatory catabolism of tissue biomass. The null effects of OA on calcification at two irradiances support a growing body of work concluding some reef corals may be able to employ compensatory physiological mechanisms that maintain present-day levels of calcification under OA. However, negative effects of OA on P. acuta biomass composition and energy content may impact the long-term performance and scope for growth of this species in a high pCO2 world.
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Affiliation(s)
- C. B. Wall
- Hawai‘i Institute of Marine Biology, School of Ocean and Earth Science and Technology, University of Hawai‘i at Mānoa, PO Box 1346, Kāne‘ohe, HI 96744, USA
| | - R. A. B. Mason
- Hawai‘i Institute of Marine Biology, School of Ocean and Earth Science and Technology, University of Hawai‘i at Mānoa, PO Box 1346, Kāne‘ohe, HI 96744, USA
| | - W. R. Ellis
- Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA
| | - R. Cunning
- Hawai‘i Institute of Marine Biology, School of Ocean and Earth Science and Technology, University of Hawai‘i at Mānoa, PO Box 1346, Kāne‘ohe, HI 96744, USA
| | - R. D. Gates
- Hawai‘i Institute of Marine Biology, School of Ocean and Earth Science and Technology, University of Hawai‘i at Mānoa, PO Box 1346, Kāne‘ohe, HI 96744, USA
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44
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Ross CL, Falter JL, McCulloch MT. Active modulation of the calcifying fluid carbonate chemistry (δ 11B, B/Ca) and seasonally invariant coral calcification at sub-tropical limits. Sci Rep 2017; 7:13830. [PMID: 29062113 PMCID: PMC5653831 DOI: 10.1038/s41598-017-14066-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 10/05/2017] [Indexed: 11/08/2022] Open
Abstract
Coral calcification is dependent on both the supply of dissolved inorganic carbon (DIC) and the up-regulation of pH in the calcifying fluid (cf). Using geochemical proxies (δ11B, B/Ca, Sr/Ca, Li/Mg), we show seasonal changes in the pHcf and DICcf for Acropora yongei and Pocillopora damicornis growing in-situ at Rottnest Island (32°S) in Western Australia. Changes in pHcf range from 8.38 in summer to 8.60 in winter, while DICcf is 25 to 30% higher during summer compared to winter (×1.5 to ×2 seawater). Thus, both variables are up-regulated well above seawater values and are seasonally out of phase with one another. The net effect of this counter-cyclical behaviour between DICcf and pHcf is that the aragonite saturation state of the calcifying fluid (Ωcf) is elevated ~4 times above seawater values and is ~25 to 40% higher during winter compared to summer. Thus, these corals control the chemical composition of the calcifying fluid to help sustain near-constant year-round calcification rates, despite a seasonal seawater temperature range from just ~19° to 24 °C. The ability of corals to up-regulate Ωcf is a key mechanism to optimise biomineralization, and is thus critical for the future of coral calcification under high CO2 conditions.
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Affiliation(s)
- Claire L Ross
- Oceans Institute and School of Earth Sciences, The University of Western Australia, Perth, Australia.
- Australian Research Council Centre of Excellence for Coral Reef Studies, The University of Western Australia, Perth, Australia.
| | - James L Falter
- Oceans Institute and School of Earth Sciences, The University of Western Australia, Perth, Australia
- Australian Research Council Centre of Excellence for Coral Reef Studies, The University of Western Australia, Perth, Australia
| | - Malcolm T McCulloch
- Oceans Institute and School of Earth Sciences, The University of Western Australia, Perth, Australia
- Australian Research Council Centre of Excellence for Coral Reef Studies, The University of Western Australia, Perth, Australia
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Le Goff C, Tambutté E, Venn AA, Techer N, Allemand D, Tambutté S. In vivo pH measurement at the site of calcification in an octocoral. Sci Rep 2017; 7:11210. [PMID: 28894174 PMCID: PMC5593875 DOI: 10.1038/s41598-017-10348-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 08/03/2017] [Indexed: 11/21/2022] Open
Abstract
Calcareous octocorals are ecologically important calcifiers, but little is known about their biomineralization physiology, relative to scleractinian corals. Many marine calcifiers promote calcification by up-regulating pH at calcification sites against the surrounding seawater. Here, we investigated pH in the red octocoral Corallium rubrum which forms sclerites and an axial skeleton. To achieve this, we cultured microcolonies on coverslips facilitating microscopy of calcification sites of sclerites and axial skeleton. Initially we conducted extensive characterisation of the structural arrangement of biominerals and calcifying cells in context with other tissues, and then measured pH by live tissue imaging. Our results reveal that developing sclerites are enveloped by two scleroblasts and an extracellular calcifying medium of pH 7.97 ± 0.15. Similarly, axial skeleton crystals are surrounded by cells and a calcifying medium of pH 7.89 ± 0.09. In both cases, calcifying media are more alkaline compared to calcifying cells and fluids in gastrovascular canals, but importantly they are not pH up-regulated with respect to the surrounding seawater, contrary to what is observed in scleractinians. This points to a potential vulnerability of this species to decrease in seawater pH and is consistent with reports that red coral calcification is sensitive to ocean acidification.
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Affiliation(s)
- C Le Goff
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine Ier, MC-98000, Monaco, Monaco
| | - E Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine Ier, MC-98000, Monaco, Monaco
| | - A A Venn
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine Ier, MC-98000, Monaco, Monaco
| | - N Techer
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine Ier, MC-98000, Monaco, Monaco
| | - D Allemand
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine Ier, MC-98000, Monaco, Monaco
| | - S Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 8 Quai Antoine Ier, MC-98000, Monaco, Monaco.
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Allison N. Reconstructing coral calcification fluid dissolved inorganic carbon chemistry from skeletal boron: An exploration of potential controls on coral aragonite B/Ca. Heliyon 2017; 3:e00387. [PMID: 28920090 DOI: 10.1016/j.heliyon.2017.e00387] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 08/10/2017] [Indexed: 11/22/2022] Open
Abstract
The boron geochemistry of coral skeletons reflects the dissolved inorganic carbon (DIC) chemistry of the calcification fluid from which the skeletons precipitates and may be a valuable tool to investigate the effects of climate change on coral calcification. In this paper I calculate the predicted B/Ca of aragonite precipitating from seawater based fluids as a function of pH, [DIC] and [Ca2+]. I consider how different co-precipitating DIC species affect aragonite B/Ca and also estimate the impact of variations in the B(OH)4-/co-precipitating DIC aragonite partition coefficient (KD), which may be associated with changes in the DIC and Ca2+ chemistry of the calcification fluid. The coral skeletal B/Ca versus calcification fluid pH relationships reported previously can be reproduced by estimating B(OH)4- and co-precipitating DIC speciation as a function of pHCF and assuming that KD are constant i.e. unaffected by calcification fluid saturation state. Assuming that B(OH)4- co-precipitates with CO32-, then observed patterns can be reproduced by a fluid with approximately constant [DIC] i.e. increasing pHCF concentrates CO32-, as a function of DIC speciation. Assuming that B(OH)4- co-precipitates with HCO3- only or CO32- + HCO3- then the observed patterns can be reproduced if [DIC]CF and pHCF are positively related i.e. if DIC is increasingly concentrated in the calcification fluid at higher pHCF probably by CO2 diffusion into the calcification site.
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Rosental B, Kozhekbaeva Z, Fernhoff N, Tsai JM, Traylor-Knowles N. Coral cell separation and isolation by fluorescence-activated cell sorting (FACS). BMC Cell Biol 2017; 18:30. [PMID: 28851289 PMCID: PMC5575905 DOI: 10.1186/s12860-017-0146-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 08/20/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Generalized methods for understanding the cell biology of non-model species are quite rare, yet very much needed. In order to address this issue, we have modified a technique traditionally used in the biomedical field for ecological and evolutionary research. Fluorescent activated cell sorting (FACS) is often used for sorting and identifying cell populations. In this study, we developed a method to identify and isolate different cell populations in corals and other cnidarians. METHODS Using fluorescence-activated cell sorting (FACS), coral cell suspension were sorted into different cellular populations using fluorescent cell markers that are non-species specific. Over 30 different cell markers were tested. Additionally, cell suspension from Aiptasia pallida was also tested, and a phagocytosis test was done as a downstream functional assay. RESULTS We found that 24 of the screened markers positively labeled coral cells and 16 differentiated cell sub-populations. We identified 12 different cellular sub-populations using three markers, and found that each sub-population is primarily homogeneous. Lastly, we verified this technique in a sea anemone, Aiptasia pallida, and found that with minor modifications, a similar gating strategy can be successfully applied. Additionally, within A. pallida, we show elevated phagocytosis of sorted cells based on an immune associated marker. CONCLUSIONS In this study, we successfully adapted FACS for isolating coral cell populations and conclude that this technique is translatable for future use in other species. This technique has the potential to be used for different types of studies on the cellular stress response and other immunological studies.
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Affiliation(s)
- Benyamin Rosental
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, 94305, USA.
- Department of Pathology, Hopkins Marine Station, Stanford University, 120 Ocean View Blvd, Pacific Grove, CA, 93950, USA.
| | - Zhanna Kozhekbaeva
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Florida, 33149, USA
| | - Nathaniel Fernhoff
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Jonathan M Tsai
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Nikki Traylor-Knowles
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Florida, 33149, USA.
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Mass T, Giuffre AJ, Sun CY, Stifler CA, Frazier MJ, Neder M, Tamura N, Stan CV, Marcus MA, Gilbert PUPA. Amorphous calcium carbonate particles form coral skeletons. Proc Natl Acad Sci U S A 2017; 114:E7670-8. [PMID: 28847944 DOI: 10.1073/pnas.1707890114] [Citation(s) in RCA: 139] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Do corals form their skeletons by precipitation from solution or by attachment of amorphous precursor particles as observed in other minerals and biominerals? The classical model assumes precipitation in contrast with observed "vital effects," that is, deviations from elemental and isotopic compositions at thermodynamic equilibrium. Here, we show direct spectromicroscopy evidence in Stylophora pistillata corals that two amorphous precursors exist, one hydrated and one anhydrous amorphous calcium carbonate (ACC); that these are formed in the tissue as 400-nm particles; and that they attach to the surface of coral skeletons, remain amorphous for hours, and finally, crystallize into aragonite (CaCO3). We show in both coral and synthetic aragonite spherulites that crystal growth by attachment of ACC particles is more than 100 times faster than ion-by-ion growth from solution. Fast growth provides a distinct physiological advantage to corals in the rigors of the reef, a crowded and fiercely competitive ecosystem. Corals are affected by warming-induced bleaching and postmortem dissolution, but the finding here that ACC particles are formed inside tissue may make coral skeleton formation less susceptible to ocean acidification than previously assumed. If this is how other corals form their skeletons, perhaps this is how a few corals survived past CO2 increases, such as the Paleocene-Eocene Thermal Maximum that occurred 56 Mya.
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Rollion-bard C, Cuif J, Blamart D. Optical Observations and Geochemical Data in Deep-Sea Hexa- and Octo-Coralla Specimens. Minerals 2017; 7:154. [DOI: 10.3390/min7090154] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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50
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Comeau S, Cornwall CE, McCulloch MT. Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification. Sci Rep 2017; 7:7573. [PMID: 28790423 DOI: 10.1038/s41598-017-08003-z] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 07/07/2017] [Indexed: 11/29/2022] Open
Abstract
Evaluating the factors responsible for differing species-specific sensitivities to declining seawater pH is central to understanding the mechanisms via which ocean acidification (OA) affects coral calcification. We report here the results of an experiment comparing the responses of the coral Acropora yongei and Pocillopora damicornis to differing pH levels (8.09, 7.81, and 7.63) over an 8-week period. Calcification of A. youngei was reduced by 35% at pH 7.63, while calcification of P. damicornis was unaffected. The pH in the calcifying fluid (pHcf) was determined using δ11B systematics, and for both species pHcf declined slightly with seawater pH, with the decrease being more pronounced in P. damicornis. The dissolved inorganic carbon concentration at the site of calcification (DICcf) was estimated using geochemical proxies (B/Ca and δ11B) and found to be double that of seawater DIC, and increased in both species as seawater pH decreased. As a consequence, the decline of the saturation state at the site of calcification (Ωcf) with OA was partially moderated by the DICcf increase. These results highlight that while pHcf, DICcf and Ωcf are important in the mineralization process, some corals are able to maintain their calcification rates despite shifts in their calcifying fluid carbonate chemistry.
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