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First Assessment of the Benthic Meiofauna Sensitivity to Low Human-Impacted Mangroves in French Guiana

Michelet, Claire and Zeppilli, Daniela and Hubas, Cédric and Baldrighi, Elisa and Cuny, Philippe and Dirberg, Guillaume and Militon, Cécile and Walcker, Romain and Lamy, Dominique and Jézéquel, Ronan and Receveur, Justine and Gilbert, Franck and El Houssainy, Amonda and Dufour, Aurélie and Heimbürger-Boavida, Lars-Eric and Bihannic, Isabelle and Sylvi, Léa and Vivier, Baptiste and Michaud, Emma First Assessment of the Benthic Meiofauna Sensitivity to Low Human-Impacted Mangroves in French Guiana. (2021) Forests, 12 (3). 338. ISSN 1999-4907

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Official URL: https://doi.org/10.3390/f12030338

Abstract

Bioindicators assess the mangroves ecological state according to the types of pressures but they differ with the ecosystem’s specificities. We investigated benthic meiofauna diversity and structure within the low human-impacted mangroves in French Guiana (South America) in response to sediment variables with various distances to the main city. Contaminant’s concentrations differed among the stations, but they remained below toxicity guidelines. Meiofauna structure (Foraminifera, Kinorhyncha, Nematoda) however varied accordingly. Nematode’s identification brought details on the sediment’s quality. The opportunistic genus Paraethmolaimus (Jensen, 1994) strongly correlated to the higher concentrations of Hg, Pb. Anoxic sediments were marked by organic enrichment in pesticides, PCB, and mangrove litter products and dominance of two tolerant genus, Terschellingia (de Man, 1888) and Spirinia (Gerlach, 1963). In each of these two stations, we found many Desmodora individuals (de Man, 1889) with the presence of epibionts highlighting the nematodes decreased fitness and defenses. Oxic sediments without contaminants were distinguished by the sensitive genera Pseudocella (Filipjev, 1927) and a higher diversity of trophic groups. Our results suggested a nematodes sensitivity to low contaminants concentrations. Further investigations at different spatio-temporal scales and levels of deterioration, would be necessary to use of this group as bioindicator of the mangroves’ ecological status.

Item Type:Article
Additional Information:Licence : CC-BY 4.0
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Funders:
Office de l’Eau de la Guyane - OEG (France) - Office français de la biodiversité - OFB (France) - “Investissements d’Avenir” grant managed by Agence Nationale de la Recherche - ANR (France) - AXA Research Fund - FEDER grant number 1166-39417
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Deposited On:25 Mar 2021 13:41

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