Section: Ecology
Topic: Ecology, Microbiology, Environmental sciences

Identification of microbial exopolymer producers in sandy and muddy intertidal sediments by compound-specific isotope analysis

10.24072/pcjournal.336 - Peer Community Journal, Volume 3 (2023), article no. e104.

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Extracellular polymeric substances (EPS) refer to a wide variety of high molecular weight molecules secreted outside the cell membrane by biofilm microorganisms. In the present study, EPS from marine microphytobenthic biofilms were extracted and their isotope ratios were analysed. A comparison of these ratios with the carbon isotope ratios of fatty acid biomarkers allowed the identification of the main EPS producers of two contrasting types of intertidal marine sediments. Our study reveals that EPS sources are more diverse in sandy sediments than in muddy sediments. We also found distinct patterns in the production and breakdown of EPS in sandy and muddy environments. The main difference observed was in how epipelic and epipsammic diatoms affected the chemistry of EPS, which had significant implications for the growth of bacteria specialized in utilizing EPS. These differences were likely linked to variations in the functioning of epipelic and epipsammic communities, specifically in how EPS was used either for motility or for cell attachment.

Published online:
DOI: 10.24072/pcjournal.336
Type: Research article
Keywords: Extracellular Polymeric Substances, Stable isotopes, compound specific isotope analysis, fatty acids
Hubas, Cédric 1; Gaubert-Boussarie, Julie 1; D’Hondt, An-Sofie 2; Jesus, Bruno 3; Lamy, Dominique 4, 5; Meleder, Vona 3; Prins, Antoine 1, 3; Rosa, Philippe 3; Stock, Willem 6; Sabbe, Koen 6

1 Laboratoire de Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Muséum National d’Histoire Naturelle, CNRS, Sorbonne Université, IRD, Université des Antilles, Université de Caen Normandie; Station Marine de Concarneau, Place de la croix,29900, Concarneau, France
2 Department of Biology, Marine Biology Research Group, Ghent University, Krijgslaan 281/S8, 9000, Belgium
3 Nantes Université, Institut des Substances et Organismes de la Mer, ISOMer, UR 2160, F-44000 Nantes, France
4 Laboratoire de Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Muséum National d’Histoire Naturelle, CNRS, Sorbonne Université, IRD, Université des Antilles, Université de Caen Normandie; Jardin des plantes, Bâtiment arthropodes, Paris, France
5 Institute of Ecology and Environmental Sciences of Paris (iEES-Paris), Sorbonne Université, Univ Paris Est Créteil, IRD, CNRS, INRA, 4 place Jussieu, 75005 Paris, France
6 Department of Biology, Research Group Protistology and Aquatic Ecology, Ghent University, Krijgslaan 281/S8, 9000, Belgium
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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     title = {Identification of microbial exopolymer producers in sandy and muddy intertidal sediments by compound-specific isotope analysis},
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Hubas, Cédric; Gaubert-Boussarie, Julie; D’Hondt, An-Sofie; Jesus, Bruno; Lamy, Dominique; Meleder, Vona; Prins, Antoine; Rosa, Philippe; Stock, Willem; Sabbe, Koen. Identification of microbial exopolymer producers in sandy and muddy intertidal sediments by compound-specific isotope analysis. Peer Community Journal, Volume 3 (2023), article  no. e104. doi : 10.24072/pcjournal.336. https://peercommunityjournal.org/articles/10.24072/pcjournal.336/

Peer reviewed and recommended by PCI : 10.24072/pci.ecology.100519

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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