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Nat Commun. 2014 Jul 10;5:4359. doi: 10.1038/ncomms5359.

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

Author information

1
1] INRA, UR406 Abeilles et Environnement, F-84914 Avignon, France [2] UMT Protection des Abeilles dans l'Environnement, Site Agroparc, F-84914 Avignon, France.
2
1] INRA, UR980 SAD Paysage, F-35042 Rennes, France [2] CNRS et Université de Rennes 1, UMR6553 Ecosystèmes Biodiversité Evolution, F-35042 Rennes, France.
3
1] INRA, UE1255, UE Entomologie, F-17700 Surgères, France [2] Centre d'Etudes Biologiques de Chizé, CNRS (USC-INRA 1339), UPR1934, F-79360 Beauvoir-sur-Niort, France.
4
INRA, UE1255, UE Entomologie, F-17700 Surgères, France.
5
Centre d'Etudes Biologiques de Chizé, CNRS (USC-INRA 1339), UPR1934, F-79360 Beauvoir-sur-Niort, France.
6
1] UMT Protection des Abeilles dans l'Environnement, Site Agroparc, F-84914 Avignon, France [2] Association de Coordination Technique Agricole, Site Agroparc, F-84914 Avignon, France [3] ITSAP-Institut de l'abeille, Site Agroparc, F-84914 Avignon, France.

Abstract

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.

PMID:
25008773
DOI:
10.1038/ncomms5359
[Indexed for MEDLINE]
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