Marine Pollution Bulletin;
Available online 12 February 2017;
In Press, Corrected Proof — Note to users;

Sub-lethal effects of a glyphosate-based commercial formulation and adjuvants on juvenile oysters (Crassostrea gigas) exposed for 35 days;

  • Alexis Séguin1, 
  • Antoine Mottier1, 
  • Carole Perron, 
  • Jean Marc Lebel, 
  • Antoine Serpentini, 
  • Katherine Costil, 

    • Normandie Université, F-14032 Caen, France;
    • UMR BOREA (Biologie des Organismes et Ecosystèmes Aquatiques); MNHN, UPMC, UCN, CNRS-7208, IRD-207; IBFA; Université de Caen Normandie, Esplanade de la Paix, CS 14032;14032 Caen Cedex 5, France;

    Received 2 September 2016, Revised 18 January 2017, Accepted 9 February 2017, Available online 12 February 2017;


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    http://dx.doi.org/10.1016/j.marpolbul.2017.02.028;


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    Highlights

    •
    Sublethal effects were studied in oysters exposed to Roundup® and POEAs for 35 days.
    •
    Both pollutants had harmful effects on shell but not on flesh growth and tissues.
    •
    No dose-response effects in biochemical endpoints after exposures to REX and POEAs
    •
    The highest concentration induced no significant effects on juvenile oysters.
    •
    Slight but higher effects recorded at the 2 lowest concentrations of REX and POEAs.

    Abstract

    Glyphosate-based herbicides include active matter and adjuvants (e.g. polyethoxylated tallow amines, POEAs). In addition to a previous investigation on the effect of glyphosate on oysters, the aim of the present study was to investigate the effects of sub-chronic exposures (35 days) to three concentrations (0.1, 1 and 100 μg L− 1) of Roundup Express® (REX) and POEAs on oysters belonging to the same age group. Low mortality rates were calculated, and only few significant differences (i.e. shell length) between exposure conditions were observed at a given date. However, when comparing the biomarker's temporal variations, some different patterns (e.g. condition index, reproduction, parameters of oxidative stress) were observed depending on the molecules and concentrations. These results suggest that a longer exposure to an environmental concentration (0.1 μg L− 1) of REX and POEAs could induce harmful effects on oysters.

    Keywords

    • Crassostrea gigas; 
    • Roundup®; 
    • POEAs; 
    • Mortality; 
    • Individual biomarkers; 
    • Oxidative stress

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