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

Forests

卷:12

Cécile Militon¹  Lars-Eric Heimbürger-Boavida¹  AmondaEl Houssainy¹  Aurélie Dufour¹  Philippe Cuny¹  Léa Sylvi¹  Baptiste Vivier²  Dominique Lamy²  Guillaume Dirberg²  Cédric Hubas³  Justine Receveur⁴  Ronan Jézéquel⁴  Daniela Zeppilli⁵  Franck Gilbert⁶  Romain Walcker⁶  Elisa Baldrighi⁷  Emma Michaud⁷  Isabelle Bihannic⁷  Claire Michelet⁷ 

[1] Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France;

[2] Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Muséum National D’Histoire Naturelle, CNRS, Sorbonne Université, IRD, UCN, UA, Rue Buffon, F-75005 Paris, 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] CEDRE, Rue Alain Colas, F-29218 Brest CEDEX 2, France;

[5] IFREMER, Centre Brest, REM/EEP/LEP, ZI de la Pointe du Diable, CS10070, F-29280 Plouzané, France;

[6] Laboratoire Écologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Toulouse INP, Université Toulouse 3—Paul Sabatier (UPS), 31 326 Toulouse, France;

[7] Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France;

关键词: mangroves;    biodiversity;    meiofauna;    nematode;    anthropogenic pressures;    natural contamination;   

DOI  :  10.3390/f12030338

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown