Pesticide risk assessment in free-ranging bees is weather and landscape dependent

作者：Henry Mickael^*; Bertrand Colette; Le Feon Violette; Requier Fabrice; Odoux Jean Francois; Aupinel Pierrick; Bretagnolle Vincent; Decourtye Axel

来源：Nature Communications, 2014, 5(1): 4359.

DOI：10.1038/ncomms5359

The risk assessment of plant protection products on pollinators is currently based on the evaluation of lethal doses through repeatable lethal toxicity laboratory trials. Recent advances in honeybee toxicology have, however, raised interest on assessing sublethal effects in free-ranging individuals. Here, we show that the sublethal effects of a neonicotinoid pesticide are modified in magnitude by environmental interactions specific to the landscape and time of exposure events. Field sublethal assessment is therefore context dependent and should be addressed in a temporally and spatially explicit way, especially regarding weather and landscape physiognomy. We further develop an analytical Effective Dose (ED) framework to help disentangle context-induced from treatment-induced effects and thus to alleviate uncertainty in field studies. Although the ED framework involves trials at concentrations above the expected field exposure levels, it allows to explicitly delineating the climatic and landscape contexts that should be targeted for in-depth higher tier risk assessment.

• 出版日期2014-7