Pesticide mixture toxicity assessment through in situ and laboratory approaches using embryo-larval stages of the pacific oyster (Magallana gigas)

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Authors

KUCHOVSKÁ Eliška GONZALEZ Patrice BLÁHOVÁ Lucie BARRE Mathilde GOUFFIER Corentin CACHOT Jerome ROMERO-RAMIREZ Alicia BLÁHA Luděk MORIN Benedicte

Year of publication 2021
Type Article in Periodical
Magazine / Source MARINE ENVIRONMENTAL RESEARCH
MU Faculty or unit

Faculty of Science

Citation
Web https://www.sciencedirect.com/science/article/pii/S014111362100146X?via%3Dihub
Doi http://dx.doi.org/10.1016/j.marenvres.2021.105390
Keywords Arcachon bay; Coastal waters; Developmental abnormality; Gene expression; In situ; Mixtures; Pacific oyster; Pesticides; Sublethal effects; Swimming behavior
Description Worsened state of oysters in French Arcachon Bay, demand an investigation of possible causes. This study evaluated the effects of an environmentally relevant mixture of five common pesticides on the early-life stages of the Pacific oyster (Magallana gigas). Laboratory assays with artificial mixture and in situ transplantation were complementarily used to investigate a series of sublethal endpoints. The laboratory exposure revealed developmental toxicity at 0.32 mu g/L, which corresponds to mixture concentrations in Arcachon Bay. Downregulation of some gene transcriptions was observed at environmental level. No difference in larvae development was revealed among the three sites in Arcachon Bay. This study was the first to evaluate locomotion of oyster larvae exposed in situ. Suspected poor water quality in the inner part of Arcachon Bay was reflected by impairment at the molecular level. In conclusion, current concentrations of the tested pesticides in Arcachon Bay hinder larval development and affect several biological functions.
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