Rapid responses of pristine marine planktonic communities in experimental approach to diuron and naphthalene (Juan de Nova Island, Western Indian Ocean)

Type Article
Acceptance Date 2021 IN PRESS
Language English
Author(s) Bouvy MarcORCID1, Dupuy Christine2, Got Patrice1, Domaizon Isabelle3, Carré Claire1, Pagano Marc4, Debroas Didier5, Roques Cécile1, Leboulanger Christophe1
Affiliation(s) 1 : UMR 9190 MARBEC, Universite´ de Montpellier-IRD-Ifremer-CNRS, Place Euge`ne Bataillon, Case 093, F-34095 Montpellier cedex 5, France
2 : UMR 7266 Littoral, Environnement et Socie´te´s (LIENSs), CNRS-Universite´ de La Rochelle, 2 Rue Olympe de Gouges, F-17000 La Rochelle cedex, France
3 : UMR 042 CARRTEL, INRAE-Universite´ Savoie M2ont Blanc, 75 Avenue de Corzent, F-74203 Thonon-les-Bains cedex, France.
4 : DUMR 235 Mediterranean Institute of Oceanography (MIO), IRD-CNRS-Universite´ de Toulon-Universite´ Aix-Marseille, F-13288 Marseille cedex 09, France
5 : UMR 6023 Microorganismes Ge´nome et Environnement, CNRS-Universite´ Clermont Auvergne, 24 Avenue des Landais, F-63177 Aubie`re cedex, France.
Source Marine and Freshwater Research (1323-1650) (CSIRO Publishing) In Press
DOI 10.1071/MF20276
Keyword(s) contaminant, taxonomy, metabarcoding, plankton, experiments, lagoon.
Abstract

Planktonic communities from Juan de Nova lagoon were submitted to a single exposure of diuron or naphthalene in triplicate outdoor 40-L mesocosms for 5 days. The study followed the temporal changes of the assemblages by determining abundances and taxonomic level of microbial (heterotrophic prokaryotes, picocyanobacteria, heterotrophic protists and phytoplankton) and metazooplankton communities. Exposure to both contaminants did not result in significant changes in phytoplankton abundances. Microscopic identification demonstrated the dominance of Bacillariophyta (mostly Chaetoceros tenuissimus) accounting for more than 95% of the microalgae detected in all mesocosms. Using 18S rRNA metabarcoding, temporal changes in the proportion of eukaryotic operational taxonomic units (OTUs) were highlighted for most taxonomic groups. Diuron had no significant effect on the abundance of eukaryotic picoheterotrophs, ciliates, whereas naphthalene had a significant positive effect on heterotrophic prokaryotes. Metazooplankton was not significantly modified under contaminant exposure, except for copepods nauplii in presence of diuron. Multivariate analysis indicated significant responses of communities linked to the experimental time and conditions. The analysis also revealed a modification of the trophic relationships among communities over time, from a dominant multivorous food web after 48 h towards a reduced microbial loop after 120 h of experiment time.

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Bouvy Marc, Dupuy Christine, Got Patrice, Domaizon Isabelle, Carré Claire, Pagano Marc, Debroas Didier, Roques Cécile, Leboulanger Christophe Rapid responses of pristine marine planktonic communities in experimental approach to diuron and naphthalene (Juan de Nova Island, Western Indian Ocean). Marine and Freshwater Research IN PRESS. Publisher's official version : https://doi.org/10.1071/MF20276 , Open Access version : https://archimer.ifremer.fr/doc/00681/79348/