Can pesticides, copper and seasonal water temperature explain the seagrass Zostera noltei decline in the Arcachon bay?

MARINE POLLUTION BULLETIN

卷:134

Article

Gamain, Perrine¹  Feurtet-Mazel, Agnes¹  Maury-Brachet, Regine¹  Auby, Isabelle³  Pierron, Fabien¹  Belles, Angel²  Budzinski, Helene²  Daffe, Guillemine¹  Gonzalez, Patrice¹ 

[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

关键词: Zostera noltei;    Arcachon Bay;    Pesticides;    Copper;    Cellular impacts;   

DOI  :  10.1016/j.marpolbul.2017.10.024

来源: Elsevier

【 摘 要 】

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, 1 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 degrees C, 20 degrees C, 28 degrees 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.

【 授权许可】

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