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Bénuffé D, Radouani F, Quemener M, Ozier O, Fauchon M, Toueix Y, Faӱ F, Magueresse A, Lescop B, Rioual S, Zongo P, Roos C, Hellio C, Salvin P. Multifactored accelerated marine corrosion of immersed steels influenced by washed ashore Sargassum rafts. MARINE ENVIRONMENTAL RESEARCH 2025; 204:106924. [PMID: 39756246 DOI: 10.1016/j.marenvres.2024.106924] [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: 07/19/2024] [Revised: 12/12/2024] [Accepted: 12/20/2024] [Indexed: 01/07/2025]
Abstract
Since 2011, massive strandings of Sargassum (brown alga) have significantly affected Caribbean islands causing major health, environmental and economic problems. Amongst them, the degradation of algae releases corrosive gases, hydrogen sulphide (H2S) and ammonia (NH3) which causes an accelerated corrosion of the metallic structures of these coastal areas. The aim of this study was to quantify the impact of Sargassum strandings on the corrosion of three types of steels (DC01 carbon steel, 304L and 316L stainless steels) immersed for up to 120 days at various sites in Martinique which were gradually impacted by Sargassum. A multidisciplinary approach was developed, incorporating: (i) surface analysis through macrophotography and corrosion product examination, (ii) weight loss measurements, and (iii) analysis of physicochemical parameters alongside microbial composition. As a result, in the presence of degraded Sargassum, an anaerobic, reducing and more acidic environment was correlated with high corrosion rates for all studied steels. When high density of Sargassum sp. was present, elemental sulphur was identified in the corrosion product layers of DC01 and 316L. Moreover, in this condition, sulphate-reducing bacteria (SRB) were observed in the surface biofilms of 304L coupons such as Desulfobulbus rhabdoformis. All these factors have highlighted the aggressiveness of the medium resulting from the presence of decomposing Sargassum, leading to increased corrosion rates. Our work provides new information on the importance of managing Sargassum strandings in order to avoid accelerated degradation of metallic structures in harbours and coastal zones.
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Affiliation(s)
- Diana Bénuffé
- L3MA UR4_1 UFR STE Universite des Antilles, Campus de Schoelcher, Schoelcher, 97275, France
| | - Fatima Radouani
- L3MA UR4_1 UFR STE Universite des Antilles, Campus de Schoelcher, Schoelcher, 97275, France
| | - Maxence Quemener
- Univ Brest, CNRS, IRD, Ifremer, LEMAR, IUEM, F-29280 Plouzane, France
| | - Olivia Ozier
- L3MA UR4_1 UFR STE Universite des Antilles, Campus de Schoelcher, Schoelcher, 97275, France
| | - Marilyne Fauchon
- Univ Brest, CNRS, IRD, Ifremer, LEMAR, IUEM, F-29280 Plouzane, France
| | - Yannick Toueix
- Univ Brest, CNRS, IRD, Ifremer, LEMAR, IUEM, F-29280 Plouzane, France
| | - Fabienne Faӱ
- Laboratoire de Biotechnologie et Chimie Marines, Université Bretagne Sud, EMR CNRS 6076, IUEM, 56100, Lorient, France
| | | | - Benoit Lescop
- Lab-STICC, UMR CNRS 6285, Université de Bretagne Occidentale, 29200, Brest, France
| | - Stéphane Rioual
- Lab-STICC, UMR CNRS 6285, Université de Bretagne Occidentale, 29200, Brest, France
| | - Pascal Zongo
- L3MA UR4_1 UFR STE Universite des Antilles, Campus de Schoelcher, Schoelcher, 97275, France
| | - Christophe Roos
- L3MA UR4_1 UFR STE Universite des Antilles, Campus de Schoelcher, Schoelcher, 97275, France
| | - Claire Hellio
- Univ Brest, CNRS, IRD, Ifremer, LEMAR, IUEM, F-29280 Plouzane, France
| | - Paule Salvin
- L3MA UR4_1 UFR STE Universite des Antilles, Campus de Schoelcher, Schoelcher, 97275, France.
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Stiffler AK, Hesketh-Best PJ, Varona NS, Zagame A, Wallace BA, Lapointe BE, Silveira CB. Genomic and induction evidence for bacteriophage contributions to sargassum-bacteria symbioses. MICROBIOME 2024; 12:143. [PMID: 39090708 PMCID: PMC11295528 DOI: 10.1186/s40168-024-01860-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 06/19/2024] [Indexed: 08/04/2024]
Abstract
BACKGROUND Symbioses between primary producers and bacteria are crucial for nutrient exchange that fosters host growth and niche adaptation. Yet, how viruses that infect bacteria (phages) influence these bacteria-eukaryote interactions is still largely unknown. Here, we investigate the role of viruses on the genomic diversity and functional adaptations of bacteria associated with pelagic sargassum. This brown alga has dramatically increased its distribution range in the Atlantic in the past decade and is predicted to continue expanding, imposing severe impacts on coastal ecosystems, economies, and human health. RESULTS We reconstructed 73 bacterial and 3963 viral metagenome-assembled genomes (bMAGs and vMAGs, respectively) from coastal Sargassum natans VIII and surrounding seawater. S. natans VIII bMAGs were enriched in prophages compared to seawater (28% and 0.02%, respectively). Rhodobacterales and Synechococcus bMAGs, abundant members of the S. natans VIII microbiome, were shared between the algae and seawater but were associated with distinct phages in each environment. Genes related to biofilm formation and quorum sensing were enriched in S. natans VIII phages, indicating their potential to influence algal association in their bacterial hosts. In-vitro assays with a bacterial community harvested from sargassum surface biofilms and depleted of free viruses demonstrated that these bacteria are protected from lytic infection by seawater viruses but contain intact and inducible prophages. These bacteria form thicker biofilms when growing on sargassum-supplemented seawater compared to seawater controls, and phage induction using mitomycin C was associated with a significant decrease in biofilm formation. The induced metagenomes were enriched in genomic sequences classified as temperate viruses compared to uninduced controls. CONCLUSIONS Our data shows that prophages contribute to the flexible genomes of S. natans VIII-associated bacteria. These prophages encode genes with symbiotic functions, and their induction decreases biofilm formation, an essential capacity for flexible symbioses between bacteria and the alga. These results indicate that prophage acquisition and induction contribute to genomic and functional diversification during sargassum-bacteria symbioses, with potential implications for algae growth. Video Abstract.
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Affiliation(s)
| | - Poppy J Hesketh-Best
- Department of Biology, University of Miami, Coral Gables, FL, 33146, USA
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Natascha S Varona
- Department of Biology, University of Miami, Coral Gables, FL, 33146, USA
| | - Ashley Zagame
- Department of Biology, University of Miami, Coral Gables, FL, 33146, USA
| | - Bailey A Wallace
- Department of Biology, University of Miami, Coral Gables, FL, 33146, USA
| | - Brian E Lapointe
- Harbor Branch Oceanographic Institute, Florida Atlantic University, Fort Pierce, FL, 34946, USA
| | - Cynthia B Silveira
- Department of Biology, University of Miami, Coral Gables, FL, 33146, USA.
- Department of Marine Biology and Ecology, Rosenstiel School of Marine, Atmospheric, and Earth Science, University of Miami, Miami, FL, 33149, USA.
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Domínguez-Maldonado JA, Solís-Pereira SE, Valle-Gough RE, Álvarez AAM, Olguín-Maciel E, Alzate-Gaviria L, Tapia-Tussell R. Microbial communities present in Sargassum spp. leachates from the Mexican Caribbean which are involved in their degradation in the environment, a tool to tackle the problem. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:19904-19916. [PMID: 38367105 DOI: 10.1007/s11356-024-32363-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 02/03/2024] [Indexed: 02/19/2024]
Abstract
The Sargassum phenomenon is currently affecting the Caribbean in several ways; one of them is the increase of greenhouse gases due to the decomposition process of this macroalgae; these processes also produce large amounts of pollutant leachates, in which several microbial communities are involved. To understand these processes, we conducted a 150-day study on the Sargassum spp environmental degradation under outdoor conditions, during which leachates were collected at 0, 30, 90, and 150 days. Subsequently, a metagenomic study of the microorganisms found in the leachates was carried out, in which changes in the microbial community were observed over time. The results showed that anaerobic bacterial genera such as Thermofilum and Methanopyrus were predominant at the beginning of this study (0 and 30 days), degrading sugars of sulfur polymers such as fucoidan, but throughout the experiment, the microbial communities were changed also, with the genera Fischerella and Dolichospermum being the most predominant at days 90 and 150, respectively. A principal component analysis (PCA) indicated, with 94% variance, that genera were positively correlated at 30 and 90 days, but not with initial populations, indicating changes in community structure due to sargassum degradation were present. Finally, at 150 days, the leachate volume decreased by almost 50% and there was a higher abundance of the genera Desulfobacter and Dolichospemum. This is the first work carried out to understand the degradation of Sargassum spp, which will serve, together with other works, to understand and provide a solution to this serious environmental problem in the Caribbean.
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Affiliation(s)
- Jorge Arturo Domínguez-Maldonado
- Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán, Carretera Sierra Papacal Chuburná Puerto Km 5, Merida, c.p. 97302, Yucatán, México
| | - Sara Elena Solís-Pereira
- Department of Chemical and Biochemical Engineering, Tecnológico Nacional de México/IT de Mérida, Col. Plan de Ayala Norte, Av. Tecnológico Km 4.5 S/N 97118, Merida, Yucatán, México
| | - Raúl Enrique Valle-Gough
- Universidad Autónoma de Baja California: Instituto de Ciencias Agrícolas, Carretera a Delta S/N C.P. Ejido Nuevo León, Mexicali, 21705, Baja California, México
| | - Anuar Ahmed Magaña Álvarez
- Laboratorio Gembio, Centro de InvestigaciónCientífica de Yucatán, Calle 43 # 130 Colonia Chuburná, Merida, Yucatán, México
| | - Edgar Olguín-Maciel
- Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán, Carretera Sierra Papacal Chuburná Puerto Km 5, Merida, c.p. 97302, Yucatán, México
| | - Liliana Alzate-Gaviria
- Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán, Carretera Sierra Papacal Chuburná Puerto Km 5, Merida, c.p. 97302, Yucatán, México
| | - Raúl Tapia-Tussell
- Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán, Carretera Sierra Papacal Chuburná Puerto Km 5, Merida, c.p. 97302, Yucatán, México.
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Léger-Pigout M, Navarro E, Ménard F, Ruitton S, Le Loc’h F, Guasco S, Munaron JM, Thibault D, Changeux T, Connan S, Stiger-Pouvreau V, Thibaut T, Michotey V. Predominant heterotrophic diazotrophic bacteria are involved in Sargassum proliferation in the Great Atlantic Sargassum Belt. THE ISME JOURNAL 2024; 18:wrad026. [PMID: 38365246 PMCID: PMC10833076 DOI: 10.1093/ismejo/wrad026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 11/27/2023] [Accepted: 12/08/2023] [Indexed: 02/18/2024]
Abstract
Since 2011, the Caribbean coasts have been subject to episodic influxes of floating Sargassum seaweed of unprecedented magnitude originating from a new area "the Great Atlantic Sargassum Belt" (GASB), leading in episodic influxes and mass strandings of floating Sargassum. For the biofilm of both holopelagic and benthic Sargassum as well as in the surrounding waters, we characterized the main functional groups involved in the microbial nitrogen cycle. The abundance of genes representing nitrogen fixation (nifH), nitrification (amoA), and denitrification (nosZ) showed the predominance of diazotrophs, particularly within the GASB and the Sargasso Sea. In both location, the biofilm associated with holopelagic Sargassum harboured a more abundant proportion of diazotrophs than the surrounding water. The mean δ15N value of the GASB seaweed was very negative (-2.04‰), and lower than previously reported, reinforcing the hypothesis that the source of nitrogen comes from the nitrogen-fixing activity of diazotrophs within this new area of proliferation. Analysis of the diversity of diazotrophic communities revealed for the first time the predominance of heterotrophic diazotrophic bacteria belonging to the phylum Proteobacteria in holopelagic Sargassum biofilms. The nifH sequences belonging to Vibrio genus (Gammaproteobacteria) and Filomicrobium sp. (Alphaproteobacteria) were the most abundant and reached, respectively, up to 46.0% and 33.2% of the community. We highlighted the atmospheric origin of the nitrogen used during the growth of holopelagic Sargassum within the GASB and a contribution of heterotrophic nitrogen-fixing bacteria to a part of the Sargassum proliferation.
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Affiliation(s)
- Matéo Léger-Pigout
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
| | - Elisabeth Navarro
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
| | - Frédéric Ménard
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
| | - Sandrine Ruitton
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
| | | | - Sophie Guasco
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
| | | | - Delphine Thibault
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
| | - Thomas Changeux
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
| | - Solène Connan
- Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzane, France
| | | | - Thierry Thibaut
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
| | - Valérie Michotey
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
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Hervé V, Sabatier P, Lambourdière J, Poulenard J, Lopez PJ. Temporal pesticide dynamics alter specific eukaryotic taxa in a coastal transition zone. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 866:161205. [PMID: 36603640 DOI: 10.1016/j.scitotenv.2022.161205] [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: 09/01/2022] [Revised: 12/02/2022] [Accepted: 12/22/2022] [Indexed: 06/17/2023]
Abstract
Land use change and anthropogenic forcing can drastically alter the rates and patterns of sediment transport and modify biodiversity and ecosystem functions in coastal transition zones, such as the coastal ecosystems. Molecular studies of sediment extracted DNAs provide information on currently living organisms within the upper layers or buried from various periods of time, but might also provide knowledge on species dynamics, replacement and turnover. In this study, we evaluated the eukaryotic communities of a marine core that present a shift in soil erosion that was linked to glyphosate usage and correlated to chlordecone resurgence since 2000. We show differences in community composition between samples from the second half of the last century and those from the last two decades. Temporal analyses of the relative abundance, alpha diversity, and beta diversity for the two periods demonstrated different temporal dynamics depending on the considered taxonomic group. In particular, Ascomycetes showed a decrease in abundance over the most recent period associated with changes in community membership but not community structure. Two photosynthetic groups, Bacillariophyceae and Prasinophytes clade VII, showed a different pattern with an increase in abundance since the beginning of the 21st century with a decrease in diversity and evenness to form more heterogeneous communities dominated by a few abundant OTUs. Altogether, our data reveal that agricultural usages such as pesticide use can have long-term and species-dependent implications for microeukaryotic coastal communities on a tropical island.
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Affiliation(s)
- Vincent Hervé
- Université Paris-Saclay, INRAE, AgroParisTech, UMR SayFood, 91120 Palaiseau, France
| | - Pierre Sabatier
- EDYTEM, Université Savoie Mont Blanc, CNRS, UMR-5204, 73370 Le Bourget-Du-Lac, France
| | - Josie Lambourdière
- Biologie des ORganismes et Ecosystèmes Aquatiques (BOREA), Muséum National d'Histoire Naturelle, Centre National de la Recherche Scientifique UMR-8067, Sorbonne Université, Institut de Recherche pour le Développement, Université de Caen Normandie, Université des Antilles, 75005 Paris, France
| | - Jérôme Poulenard
- EDYTEM, Université Savoie Mont Blanc, CNRS, UMR-5204, 73370 Le Bourget-Du-Lac, France
| | - Pascal Jean Lopez
- Biologie des ORganismes et Ecosystèmes Aquatiques (BOREA), Muséum National d'Histoire Naturelle, Centre National de la Recherche Scientifique UMR-8067, Sorbonne Université, Institut de Recherche pour le Développement, Université de Caen Normandie, Université des Antilles, 75005 Paris, France.
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6
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Theirlynck T, Mendonça IRW, Engelen AH, Bolhuis H, Collado-Vides L, van Tussenbroek BI, García-Sánchez M, Zettler E, Muyzer G, Amaral-Zettler L. Diversity of the holopelagic Sargassum microbiome from the Great Atlantic Sargassum Belt to coastal stranding locations. HARMFUL ALGAE 2023; 122:102369. [PMID: 36754458 DOI: 10.1016/j.hal.2022.102369] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 10/26/2022] [Accepted: 12/07/2022] [Indexed: 06/18/2023]
Abstract
The holopelagic brown macroalgae Sargassum natans and Sargassum fluitans form essential habitats for attached and mobile fauna which contributes to a unique biodiversity in the Atlantic Ocean. However, holopelagic Sargassum natans (genotype I & VIII) and Sargassum fluitans (genotype III) have begun forming large accumulations with subsequent strandings on the western coast of Africa, the Caribbean and northern Brazil, threatening local biodiversity of coastal ecosystems and triggering economic losses. Moreover, stranded masses of holopelagic Sargassum may introduce or facilitate growth of bacteria that are not normally abundant in coastal regions where Sargassum is washing ashore. Hitherto, it is not clear how the holopelagic Sargassum microbiome varies across its growing biogeographic range and what factors drive the microbial composition. We determined the microbiome associated with holopelagic Sargassum from the Great Atlantic Sargassum Belt to coastal stranding sites in Mexico and Florida. We characterized the Sargassum microbiome via amplicon sequencing of the 16S V4 region hypervariable region of the rRNA gene. The microbial community of holopelagic Sargassum was mainly composed of photo(hetero)trophs, organic matter degraders and potentially pathogenic bacteria from the Pseudomonadaceae, Rhodobacteraceae and Vibrionaceae. Sargassum genotypes S. natans I, S. natans VIII and S. fluitans III contained similar microbial families, but relative abundances and diversity varied. LEfSE analyses further indicated biomarker genera that were indicative of Sargassum S. natans I/VIII and S. fluitans III. The holopelagic Sargassum microbiome showed biogeographic patterning with high relative abundances of Vibrio spp., but additional work is required to determine whether that represents health risks in coastal environments. Our study informs coastal management policy, where the adverse sanitary effects of stranded Sargassum might impact the health of coastal ecosystems.
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Affiliation(s)
- Tom Theirlynck
- Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research, Den Burg, Texel, The Netherlands; Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam 1098 XH, The Netherlands
| | - Inara Regina W Mendonça
- Department of Botany, Institute of Biosciences, University of São Paulo, Rua do Matão 277, São Paulo, 05508-090, Brazil
| | - Aschwin H Engelen
- Centro de Ciências do Mar, Universidade do Algarve, Gambelas, 8005-139, Faro, Portugal
| | - Henk Bolhuis
- Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research, Den Burg, Texel, The Netherlands
| | - Ligia Collado-Vides
- Department of Biological Sciences, Institute for Water and Environment, Florida International University, 11200 SW 8th Street, Miami, 33199, FL, United States of America
| | - Brigitta I van Tussenbroek
- Unidad Académica de Sistemas Arrecifales, Instituto de Ciencias del Mar y Limnología-UNAM, Prol. Av. Niños Héroes S/N, Puerto Morelos, C.P. 77580, Q. Roo, Mexico
| | - Marta García-Sánchez
- Unidad Académica de Sistemas Arrecifales, Instituto de Ciencias del Mar y Limnología-UNAM, Prol. Av. Niños Héroes S/N, Puerto Morelos, C.P. 77580, Q. Roo, Mexico; Instituto de Ingeniería, UNAM, Ciudad Universitaria, Ciudad de México, C.P. 04510, Mexico
| | - Erik Zettler
- Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research, Den Burg, Texel, The Netherlands
| | - Gerard Muyzer
- Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam 1098 XH, The Netherlands
| | - Linda Amaral-Zettler
- Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research, Den Burg, Texel, The Netherlands; Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam 1098 XH, The Netherlands.
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