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Huang W, Wang Z, Qu F, Zhao C, Zheng M, Zhang Z, Liu S, Xu Q, Zhang X, Zhao L. Global distribution pattern and conservation of the cosmopolitan cold-water coral species Desmophyllum dianthus under climate change. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2025; 373:123674. [PMID: 39689528 DOI: 10.1016/j.jenvman.2024.123674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2024] [Revised: 12/07/2024] [Accepted: 12/07/2024] [Indexed: 12/19/2024]
Abstract
Global climate change impacts marine ecosystems differently across oceanic regions and depths. Thus, understanding how widespread key species adapt globally and locally to multidimensional climate change is crucial for targeted conservation. This study focuses on the cosmopolitan cold-water coral (CWC) Desmophyllum dianthus using ecological niche models (ENMs) to explore climate adaptation and conservation strategies. The findings indicated that D. dianthus occupied a broad ecological niche but had low ecological niche overlap across populations, suggesting local adaptations and supporting population-level ENMs. The models predicted that over 80% of D. dianthus suitable habitats would persist under SSP1-2.6 and SSP5-8.5 climate scenarios by the 2100s, potentially increasing to 95% as new habitats emerge, demonstrating its robust adaptability. However, localized environmental shifts could precipitate habitat losses in areas like the Reykjanes Ridge, Rockall Plateau, Mediterranean Sea, and Patagonian Shelf. We also applied Linkage Mapper to identify potential ecological corridors that intertwined nearshore macrohabitat patches with deep-sea stepping-stone habitats such as escarpments, seamounts, and ridges, maintaining population connectivity. Despite this, the habitats and ecological corridors of D. dianthus remained largely unprotected, with vulnerable portions lying outside of marine protected areas (MPAs), thus underscoring the urgent need for more MPA. These spatial-temporal predictions provide essential insights for the conservation and management of cosmopolitan CWC D. dianthus and serve as a benchmark for the adaptive survival of similar taxa.
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Affiliation(s)
- Wenhao Huang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, China; Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China
| | - Zongling Wang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, China; Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China
| | - Fangyuan Qu
- Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China
| | - Chang Zhao
- China Institute for Marine Affairs, Ministry of Natural Resources, Beijing, China
| | - Miaozhuang Zheng
- China Institute for Marine Affairs, Ministry of Natural Resources, Beijing, China
| | - Zhaohui Zhang
- Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China
| | - Shenghao Liu
- Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China
| | - Qinzeng Xu
- Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China
| | - Xuelei Zhang
- Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China
| | - Linlin Zhao
- Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China.
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Zhang R, Zhang H, Chen M, Liu L, Tan H, Tang Y. Impact of Hydrostatic Pressure on Molecular Structure and Dynamics of the Sodium and Chloride Ions in Portlandite Nanopores. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2151. [PMID: 38730957 PMCID: PMC11084592 DOI: 10.3390/ma17092151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 04/13/2024] [Accepted: 04/30/2024] [Indexed: 05/13/2024]
Abstract
In order to address the issues of energy depletion, more resources are being searched for in the deep sea. Therefore, research into how the deep-sea environment affects cement-based materials for underwater infrastructure is required. This paper examines the impact of ocean depth (0, 500, 1000, and 1500 m) on the ion interaction processes in concrete nanopores using molecular dynamics simulations. At the portlandite interface, the local structural and kinetic characteristics of ions and water molecules are examined. The findings show that the portlandite surface hydrophilicity is unaffected by increasing depth. The density profile and coordination number of ions alter as depth increases, and the diffusion speed noticeably decreases. The main cause of the ions' reduced diffusion velocity is expected to be the low temperature. This work offers a thorough understanding of the cement hydration products' microstructure in deep sea, which may help explain why cement-based underwater infrastructure deteriorates over time.
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Affiliation(s)
- Run Zhang
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China; (R.Z.); (L.L.); (H.T.)
| | - Hongping Zhang
- School of Mechanical Engineering, Institute for Advanced Study, Chengdu University, Chengdu 610100, China
| | - Meng Chen
- CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou 510640, China;
| | - Laibao Liu
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China; (R.Z.); (L.L.); (H.T.)
| | - Hongbin Tan
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China; (R.Z.); (L.L.); (H.T.)
| | - Youhong Tang
- Institute for NanoScale Science and Technology, College of Science and Engineering, Flinders University, Adelaide 5042, Australia
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Fähse M, Orejas C, Titschack J, Försterra G, Richter C, Laudien J. Ecophysiological and behavioural response of juveniles of the Chilean cold-water coral Caryophyllia (Caryophyllia) huinayensis to increasing sediment loads. Sci Rep 2023; 13:21538. [PMID: 38057359 PMCID: PMC10700329 DOI: 10.1038/s41598-023-47116-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 11/09/2023] [Indexed: 12/08/2023] Open
Abstract
Chilean Patagonia is a hotspot of biodiversity, harbouring cold-water corals (CWCs) that populate steep walls and overhangs of fjords and channels. Through anthropogenic activities such as deforestation, roadworks, aquafarming and increased landslide frequency, sediment input increases in the fjord region. While the absence of CWCs on moderately steep slopes has been suggested to reflect high vulnerability to sedimentation, experimental evidence has been lacking. Here, we investigated the sensitivity of CWCs to sediment stress, using juvenile Caryophyllia (Caryophyllia) huinayensis as a model. A 12-week aquarium experiment was conducted with three sediment loads: the average natural sediment concentration in Comau Fjord, 100- and 1000-fold higher sediment levels, expected from gravel road use and coastal erosion. Changes in coral mass and calyx dimensions, polyp expansion, tissue retraction and respiration were measured. For CWCs exposed to two and three order of magnitude higher sediment concentrations, 32% and 80% of the animals experienced a decrease in tissue cover, respectively, along with a decrease in respiration rate of 34% and 66%. Under the highest concentration corals showed reduced polyp expansion and a significantly reduced growth of ~ 95% compared to corals at natural concentration. The results show that C. huinayensis is affected by high sediment loads. As human activities that increase sedimentation steadily intensify, coastal planners need to consider detrimental effects on CWCs.
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Affiliation(s)
- Melanie Fähse
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27515, Bremerhaven, Germany
| | - Covadonga Orejas
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27515, Bremerhaven, Germany
- Instituto Español de Oceanografía, Centro Oceanográfico de Gijón (IEO, CSIC), Avenida Príncipe de Asturias 70 Bis, 33212, Gijón, Spain
- Hanse-Wissenschaftskolleg - Institute for Advanced Study (HWK), Lehmkuhlenbusch 4, 27753, Delmenhorst, Germany
| | - Jürgen Titschack
- MARUM-Center for Marine Environmental Sciences, University of Bremen, Leobener Str. 8, 28359, Bremen, Germany
- Senckenberg Am Meer, Marine Research Department, Südstrand 40, 26382, Wilhelmshaven, Germany
| | - Günter Försterra
- Huinay Scientific Field Station, Casilla 462, Puerto Montt, Chile
- Facultad de Recursos Naturales, Pontificia Universidad Católica de Valparaíso, Escuela de Ciencias del Mar, Valparaíso, Chile
| | - Claudio Richter
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27515, Bremerhaven, Germany
- Universität Bremen, Bibliothekstraße 1, 28359, Bremen, Germany
| | - Jürgen Laudien
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27515, Bremerhaven, Germany.
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Beck KK, Nierste J, Schmidt-Grieb GM, Lüdtke E, Naab C, Held C, Nehrke G, Steinhoefel G, Laudien J, Richter C, Wall M. Ontogenetic differences in the response of the cold-water coral Caryophyllia huinayensis to ocean acidification, warming and food availability. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 900:165565. [PMID: 37495133 DOI: 10.1016/j.scitotenv.2023.165565] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 07/03/2023] [Accepted: 07/14/2023] [Indexed: 07/28/2023]
Abstract
Cold-water corals (CWCs) are considered vulnerable to environmental changes. However, previous studies have focused on adult CWCs and mainly investigated the short-term effects of single stressors. So far, the effects of environmental changes on different CWC life stages are unknown, both for single and multiple stressors and over long time periods. Therefore, we conducted a six-month aquarium experiment with three life stages of Caryophyllia huinayensis to study their physiological response (survival, somatic growth, calcification and respiration) to the interactive effects of aragonite saturation (0.8 and 2.5), temperature (11 and 15 °C) and food availability (8 and 87 μg C L-1). The response clearly differed between life stages and measured traits. Elevated temperature and reduced feeding had the greatest effects, pushing the corals to their physiological limits. Highest mortality was observed in adult corals, while calcification rates decreased the most in juveniles. We observed a three-month delay in response, presumably because energy reserves declined, suggesting that short-term experiments overestimate coral resilience. Elevated summer temperatures and reduced food supply are likely to have the greatest impact on live CWCs in the future, leading to reduced coral growth and population shifts due to delayed juvenile maturation and high adult mortality.
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Affiliation(s)
- Kristina K Beck
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; University of Bremen, Bremen, Germany.
| | - Jan Nierste
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; University of Rostock, Rostock, Germany
| | | | - Esther Lüdtke
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Christoph Naab
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; University of Augsburg, Augsburg, Germany
| | - Christoph Held
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Gernot Nehrke
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Grit Steinhoefel
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Jürgen Laudien
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Claudio Richter
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; University of Bremen, Bremen, Germany
| | - Marlene Wall
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
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The shrunk genetic diversity of coral populations in North-Central Patagonia calls for management and conservation plans for marine resources. Sci Rep 2022; 12:14894. [PMID: 36050435 PMCID: PMC9437062 DOI: 10.1038/s41598-022-19277-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 08/26/2022] [Indexed: 11/15/2022] Open
Abstract
The Chilean Patagonia is a complex puzzle of numerous fjords, channels, bays, estuaries, and islands. The largest part of it is very remote, hampering the generation of scientific knowledge and effective management planning that could balance conservation of the marine resources with the increasing development of aquaculture activities. The present study focuses on the deep-water emergent cold-water coral Desmophyllum dianthus, dwelling in Chilean Patagonia, with the aim to illustrate its population genetic structure, demography and adaptation of the species along this coast. Microsatellite loci analysis included D. dianthus individuals from twelve sampling localities along bathymetric and oceanographic gradients from the latitude 40°S to 48°S. The results showed a lack of genetic structure with an asymmetric dispersion of individuals, and relevant heterozygosity deficiency in some populations. This study also analyses the natural and human impacts affecting the region (e.g., climate change, increasing salmon farming activities), and stresses the importance of including genetic information in the process of management and conservation of marine resources. In particular, the relevance of using interdisciplinary approaches to fill the gaps in scientific knowledge especially in remote and pristine areas of western Patagonia. Therefore, information on genetic spatial distribution of marine fauna could become pivotal to develop a holistic ecosystem-based approach for marine spatial planning.
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Environmental stability and phenotypic plasticity benefit the cold-water coral Desmophyllum dianthus in an acidified fjord. Commun Biol 2022; 5:683. [PMID: 35810196 PMCID: PMC9271058 DOI: 10.1038/s42003-022-03622-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 06/22/2022] [Indexed: 11/13/2022] Open
Abstract
The stratified Chilean Comau Fjord sustains a dense population of the cold-water coral (CWC) Desmophyllum dianthus in aragonite supersaturated shallow and aragonite undersaturated deep water. This provides a rare opportunity to evaluate CWC fitness trade-offs in response to physico-chemical drivers and their variability. Here, we combined year-long reciprocal transplantation experiments along natural oceanographic gradients with an in situ assessment of CWC fitness. Following transplantation, corals acclimated fast to the novel environment with no discernible difference between native and novel (i.e. cross-transplanted) corals, demonstrating high phenotypic plasticity. Surprisingly, corals exposed to lowest aragonite saturation (Ωarag < 1) and temperature (T < 12.0 °C), but stable environmental conditions, at the deep station grew fastest and expressed the fittest phenotype. We found an inverse relationship between CWC fitness and environmental variability and propose to consider the high frequency fluctuations of abiotic and biotic factors to better predict the future of CWCs in a changing ocean. The cold-water coral Desmophyllum dianthus benefits from stable environmental conditions in deep waters of Comau Fjord (Chile) and is able to acclimatise quickly to new environmental conditions after transplantation.
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Garcia-Herrera N, Cornils A, Laudien J, Niehoff B, Höfer J, Försterra G, González HE, Richter C. Seasonal and diel variations in the vertical distribution, composition, abundance and biomass of zooplankton in a deep Chilean Patagonian Fjord. PeerJ 2022; 10:e12823. [PMID: 35127292 PMCID: PMC8796712 DOI: 10.7717/peerj.12823] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 12/31/2021] [Indexed: 01/10/2023] Open
Abstract
Comau Fjord is a stratified Chilean Patagonian Fjord characterized by a shallow brackish surface layer and a >400 m layer of aragonite-depleted subsurface waters. Despite the energetic burden of low aragonite saturation levels to calcification, Comau Fjord harbours dense populations of cold-water corals (CWC). While this paradox has been attributed to a rich supply of zooplankton, supporting abundance and biomass data are so far lacking. In this study, we investigated the seasonal and diel changes of the zooplankton community over the entire water column. We used a Nansen net (100 µm mesh) to take stratified vertical hauls between the surface and the bottom (0-50-100-200-300-400-450 m). Samples were scanned with a ZooScan, and abundance, biovolume and biomass were determined for 41 taxa identified on the web-based platform EcoTaxa 2.0. Zooplankton biomass was the highest in summer (209 g dry mass m-2) and the lowest in winter (61 g dry mass m-2). Abundance, however, peaked in spring, suggesting a close correspondence between reproduction and phytoplankton spring blooms (Chl a max. 50.86 mg m-3, 3 m depth). Overall, copepods were the most important group of the total zooplankton community, both in abundance (64-81%) and biovolume (20-70%) followed by mysids and chaetognaths (in terms of biovolume and biomass), and nauplii and Appendicularia (in terms of abundance). Throughout the year, diel changes in the vertical distribution of biomass were found with a daytime maximum in the 100-200 m depth layer and a nighttime maximum in surface waters (0-50 m), associated with the diel vertical migration of the calanoid copepod family Metridinidae. Diel differences in integrated zooplankton abundance, biovolume and biomass were probably due to a high zooplankton patchiness driven by biological processes (e.g., diel vertical migration or predation avoidance), and oceanographic processes (estuarine circulation, tidal mixing or water column stratification). Those factors are considered to be the main drivers of the zooplankton vertical distribution in Comau Fjord.
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Affiliation(s)
- Nur Garcia-Herrera
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany,University of Bremen, Bremen, Germany
| | - Astrid Cornils
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Jürgen Laudien
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Barbara Niehoff
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Juan Höfer
- Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile,Research Center: Dynamics of High Latitude Marine Ecosystems (IDEAL), Punta Arenas, Chile,Fundación San Ignacio de Huinay, Huinay, Chile
| | - Günter Försterra
- Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Humberto E. González
- Research Center: Dynamics of High Latitude Marine Ecosystems (IDEAL), Punta Arenas, Chile,Institute of Marine and Limnological Sciences, Universidad Austral de Chile, Valdivia, Chile
| | - Claudio Richter
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany,University of Bremen, Bremen, Germany
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Maier SR, Jantzen C, Laudien J, Häussermann V, Försterra G, Cornils A, Niggemann J, Dittmar T, Richter C. The carbon and nitrogen budget of Desmophyllum dianthus-a voracious cold-water coral thriving in an acidified Patagonian fjord. PeerJ 2021; 9:e12609. [PMID: 34966598 PMCID: PMC8667745 DOI: 10.7717/peerj.12609] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 11/17/2021] [Indexed: 11/20/2022] Open
Abstract
In the North Patagonian fjord region, the cold-water coral (CWC) Desmophyllum dianthus occurs in high densities, in spite of low pH and aragonite saturation. If and how these conditions affect the energy demand of the corals is so far unknown. In a laboratory experiment, we investigated the carbon and nitrogen (C, N) budget of D. dianthus from Comau Fjord under three feeding scenarios: (1) live fjord zooplankton (100–2,300 µm), (2) live fjord zooplankton plus krill (>7 mm), and (3) four-day food deprivation. In closed incubations, C and N budgets were derived from the difference between C and N uptake during feeding and subsequent C and N loss through respiration, ammonium excretion, release of particulate organic carbon and nitrogen (POC, PON). Additional feeding with krill significantly increased coral respiration (35%), excretion (131%), and POC release (67%) compared to feeding on zooplankton only. Nevertheless, the higher C and N losses were overcompensated by the threefold higher C and N uptake, indicating a high assimilation and growth efficiency for the krill plus zooplankton diet. In contrast, short food deprivation caused a substantial reduction in respiration (59%), excretion (54%), release of POC (73%) and PON (87%) compared to feeding on zooplankton, suggesting a high potential to acclimatize to food scarcity (e.g., in winter). Notwithstanding, unfed corals ‘lost’ 2% of their tissue-C and 1.2% of their tissue-N per day in terms of metabolism and released particulate organic matter (likely mucus). To balance the C (N) losses, each D. dianthus polyp has to consume around 700 (400) zooplankters per day. The capture of a single, large krill individual, however, provides enough C and N to compensate daily C and N losses and grow tissue reserves, suggesting that krill plays an important nutritional role for the fjord corals. Efficient krill and zooplankton capture, as well as dietary and metabolic flexibility, may enable D. dianthus to thrive under adverse environmental conditions in its fjord habitat; however, it is not known how combined anthropogenic warming, acidification and eutrophication jeopardize the energy balance of this important habitat-building species.
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Affiliation(s)
- Sandra R Maier
- Department of Biosciences, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany.,Department of Estuarine and Delta Systems, Royal Netherlands Institute for Sea Research (NIOZ-Yerseke), Yerseke, Netherlands
| | - Carin Jantzen
- Department of Biosciences, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
| | - Jürgen Laudien
- Department of Biosciences, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
| | - Verena Häussermann
- Facultad de Economía y Negocios, Universidad San Sebastián, Puerto Montt, Chile.,Huinay Foundation, Puerto Montt, Chile
| | - Günter Försterra
- Escuela de Ciencias del Mar, Facultad de Recursos Naturales, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Astrid Cornils
- Department of Biosciences, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
| | - Jutta Niggemann
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany
| | - Thorsten Dittmar
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany.,Helmholtz Institute for Functional Marine Biodiversity (HIFMB), University of Oldenburg, Oldenburg, Germany
| | - Claudio Richter
- Department of Biosciences, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany.,Department of Biology/Chemistry, University of Bremen, Bremen, Germany
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