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

Type Article
Date 2021-03
Language English
Author(s) Michelet Claire1, Zeppilli DanielaORCID2, Hubas CédricORCID3, Baldrighi Elisa1, Cuny Philippe4, Dirberg Guillaume5, Militon Cécile4, Walcker RomainORCID6, Lamy Dominique5, Jézéquel Ronan7, Receveur Justine7, Gilbert FranckORCID6, Houssainy Amonda El4, Dufour AurélieORCID4, Heimbürger-Boavida Lars-EricORCID4, Bihannic Isabelle1, Sylvi Léa4, Vivier BaptisteORCID5, Michaud EmmaORCID1
Affiliation(s) 1 : Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France
2 : IFREMER, Centre Brest, REM/EEP/LEP, ZI de la Pointe du Diable, CS10070, F-29280 Plouzané, France
3 : Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Muséum National D’Histoire Naturelle, CNRS, Sorbonne Université, IRD, UCN, UA, Station Marine de Concarneau, 29900 Concarneau, France
4 : Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
5 : Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Muséum National D’Histoire Naturelle, CNRS, Sorbonne Université, IRD, UCN, UA, Rue Buffon, F-75005 Paris, France
6 : Laboratoire Écologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Toulouse INP, Université Toulouse 3—Paul Sabatier (UPS), 31 326 Toulouse, France
7 : CEDRE, Rue Alain Colas, F-29218 Brest CEDEX 2, France
Source Forests (1999-4907) (MDPI AG), 2021-03 , Vol. 12 , N. 3 , P. 338 (23p.)
DOI 10.3390/f12030338
Note This article belongs to the Special Issue Mangrove Wetland Restoration and Rehabilitation
Keyword(s) mangroves, biodiversity, meiofauna, nematode, anthropogenic pressures, natural contamination, South America
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.

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Michelet Claire, Zeppilli Daniela, Hubas Cédric, Baldrighi Elisa, Cuny Philippe, Dirberg Guillaume, Militon Cécile, Walcker Romain, Lamy Dominique, Jézéquel Ronan, Receveur Justine, Gilbert Franck, Houssainy Amonda El, Dufour Aurélie, Heimbürger-Boavida Lars-Eric, Bihannic Isabelle, Sylvi Léa, Vivier Baptiste, Michaud Emma (2021). First Assessment of the Benthic Meiofauna Sensitivity to Low Human-Impacted Mangroves in French Guiana. Forests, 12(3), 338 (23p.). Publisher's official version : https://doi.org/10.3390/f12030338 , Open Access version : https://archimer.ifremer.fr/doc/00684/79587/