Can pesticides, copper and seasonal water temperature explain the seagrass Zostera noltei decline in the Arcachon bay?
|Author(s)||Gamain Perrine1, Feurtet-Mazel Agnes1, Maury-Brachet Regine1, Auby Isabelle3, Pierron Fabien1, Belles Angel2, Budzinski Helene2, Daffe Guillemine1, Gonzalez Patrice1|
|Affiliation(s)||1 : Univ Bordeaux, UMR EPOC CNRS 5805, Aquat Ecotoxicol Team, F-33120 Arcachon, France.
2 : Univ Bordeaux, UMR EPOC CNRS 5805, LPTC Team, F-33615 Pessac, France.
3 : IFREMER Arcachon, Quaff Cdt Silhouette, Lab Environm Ressources, F-33120 Arcachon, France.
|Source||Marine Pollution Bulletin (0025-326X) (Pergamon-elsevier Science Ltd), 2018-09 , Vol. 134 , P. 66-74|
|WOS© Times Cited||14|
|Keyword(s)||Zostera noltei, Arcachon Bay, Pesticides, Copper, Cellular impacts|
Dwarf eelgrasses (Zostera noltei) populations have decreased since 2005 in Arcachon Bay (southwest France). Various stressors have been pointed out, however the role of xenobiotics like pesticides or copper (Cu) and of parameters like water temperature warming have not yet been explored. To determine their impact, Z. noltei individuals were collected in a pollution-free site and transferred to the laboratory in seawater microcosms. This dwarf eelgrass was exposed to a pesticide cocktail and copper, alone or simultaneously, at temperatures (10 °C, 20 °C, 28 °C) representative of different seasons. After a two-week contamination, leaf growth, leaf bioaccumulation of Cu, and differential expression of target genes were studied. Eelgrasses bioaccumulated Cu regardless of the temperature, with reduced efficiency in the presence of the Cu and pesticide cocktail at the two higher temperatures. High temperature also exacerbated the effect of contaminants, leading to growth inhibition and differential gene expression. Mitochondrial activity was strongly impacted and higher mortality rates occurred. Experimental results have been confirmed during field survey. This is the first report on the impacts on Z. noltei of pesticides and Cu associate to temperature.