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Mangrove microbiota along the urban-to-rural gradient of the Cayenne estuary (French Guiana, South America): drivers and potential bioindicators

Fiard, Maud and Cuny, Philippe and Sylvi, Léa and Hubas, Cédric and Jézéquel, Ronan and Lamy, Dominique and Walcker, Romain and Houssainy, Amonda El and Heimbürger-Boavida, Lars-Eric and Robinet, Tony and Bihannic, Isabelle and Gilbert, Franck and Michaud, Emma and Dirberg, Guillaume and Militon, Cécile Mangrove microbiota along the urban-to-rural gradient of the Cayenne estuary (French Guiana, South America): drivers and potential bioindicators. (2022) Science of the Total Environment, 807 (Part 1). 150667. ISSN 0048-9697

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Official URL: https://doi.org/10.1016/j.scitotenv.2021.150667


The microbial communities inhabiting the Atlantic-East Pacific (AEP) mangroves have been poorly studied, and mostly comprise chronically polluted mangroves. In this study,we characterized changes in the structure and diversity of microbial communities of mangroves along the urban-to-rural gradient of the Cayenne estuary (French Guiana, South America) that experience low human impact. The microbial communities were assigned into 50 phyla. Proteobacteria, Chloroflexi, Acidobacteria, Bacteroidetes, and Planctomycetes were the most abundant taxa. The environmental determinants found to significantly correlated to the microbial communities at these mangroveswere granulometry, dieldrin concentration, pH, and total carbon (TC) content. Furthermore, a precise analysis of the sediment highlights the existence of three types of anthropogenic pressure among the stations: (i) organic matter (OM) enrichment due to the proximity to the city and itswastewater treatment plant, (ii) dieldrin contamination, and (iii) naphthalene contamination. These forms of weak anthropogenic pressure seemed to impact the bacterial population size and microbial assemblages. A decrease in Bathyarchaeota, “Candidatus Nitrosopumilus”, andNitrospira generawas observed inmangroves subjected to OMenrichment. Mangroves polluted with organic contaminants were enriched in Desulfobacteraceae, Desulfarculaceae, and Acanthopleuribacteraceae (with dieldrin or polychlorobiphenyl contamination), and Chitinophagaceae and Geobacteraceae (with naphthalene contamination). These findings provide insights into the main environmental factors shaping microbial communities of mangroves in the AEP that experience lowhuman impact and allowfor the identification of several potential microbial bioindicators of weak anthropogenic pressure.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Aix-Marseille Université - AMU (FRANCE)
Other partners > Centre de Documentation, de Recherche et d'Expérimentations sur les pollutions accidentelles des eaux - CEDRE (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
French research institutions > Institut Français de Recherche pour l'Exploitation de la MER - IFREMER (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut national de recherche pour l'agriculture, l'alimentation et l'environnement - INRAE (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Other partners > Université Paris 1 Panthéon-Sorbonne (FRANCE)
Other partners > Sorbonne Université (FRANCE)
Other partners > Université de Bretagne Occidentale - UBO (FRANCE)
Other partners > Université Paris Est Créteil Val de Marne - UPEC (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Caen Basse-Normandie (FRANCE)
Other partners > Museum National d'Histoire Naturelle - MNHN (FRANCE)
Other partners > Université de Toulon - UTLN (FRANCE)
Other partners > Université des Antilles et de la Guyane (FRANCE)
Other partners > Université de Paris - U-Paris (FRANCE)
Laboratory name:
Office de l'Eau de la Guyane - Office Français pour la Biodiversité - European FEDER Fund - Agence Nationale de la Recherche - ANR (FRANCE)
Deposited On:25 Nov 2021 14:59

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