Dernière mise à jour le : 20 mars 2016

Oyster reproduction is affected by exposure to polystyrene microplastics

DESCRIPTION

Plastics are persistent synthetic polymers that accumulate as waste in the marine environment. Microplastic (MP) particles are derived from the breakdown of larger debris or can enter the environment as microscopic fragments. Because filter-feeder organisms ingest MP while feeding, they are likely to be impacted by MP pollution. To assess the impact of polystyrene microspheres (micro-PS) on the physiology of the Pacific oyster, adult oysters were experimentally exposed to virgin micro-PS (2 and 6 µm in diameter; 0.023 mg·L?1) for 2 mo during a reproductive cycle. Effects were investigated on ecophysiological parameters; cellular, transcriptomic, and proteomic responses; fecundity; and offspring development. Oysters preferentially ingested the 6-µm micro-PS over the 2-µm-diameter particles. Consumption of microalgae and absorption efficiency were significantly higher in exposed oysters, suggesting compensatory and physical effects on both digestive parameters. After 2 mo, exposed oysters had significant decreases in oocyte number (?38%), diameter (?5%), and sperm velocity (?23%). The D-larval yield and larval development of offspring derived from exposed parents decreased by 41% and 18%, respectively, compared with control offspring. Dynamic energy budget modeling, supported by transcriptomic profiles, suggested a significant shift of energy allocation from reproduction to structural growth, and elevated maintenance costs in exposed oysters, which is thought to be caused by interference with energy uptake. Molecular signatures of endocrine disruption were also revealed, but no endocrine disruptors were found in the biological samples. This study provides evidence that micro-PS cause feeding modifications and reproductive disruption in oysters, with significant impacts on offspring.

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keyboard_arrow_right Titre : Oyster reproduction is affected by exposure to polystyrene microplastics
keyboard_arrow_right Type de documentation : Rapports
keyboard_arrow_right Auteur(s) personne(s) : Huvet, Arnaud , Soudant, Philippe , Paul-pont, Ika , Robbens, Johan , Guyomarch, Julien , Corporeau, Charlotte , Epelboin, Yanouk , Mingant, Christian , Quillien, Virgile , Le Goïc, Nelly , Pernet, Marie Eve Julie , Fabioux, Caroline , Lambert, Christophe , Thomas, Yannick , Suquet, Marc , Sussarellu, Rossana
keyboard_arrow_right Date de publication : 20 mars 2016
keyboard_arrow_right Nombre de pages : 33p
keyboard_arrow_right Editeur(s) : National Academy of Sciences of the United States of America
keyboard_arrow_right Tags thématiques : pollution de la mer, micropolluant, mollusque, plastique, reproduction animale, ostréiculture
keyboard_arrow_right Mots-clés libres : Microplastic (MP) particles/Pacific oyster
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right N° d'édition (ISBN,DOI...) : 10.1073/pnas.1519019113
keyboard_arrow_right Collection : Revue Proceedings of the National Academy of Sciences
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