Chronic oral exposure to field-realistic pesticide combinations via pollen and nectar : effects on feeding and thermal performance in a solitary bee
Azpiazu, Celeste (Universidad Politécnica de Madrid)
Bosch, Jordi, 1961- (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Viñuela, Elisa (Universidad Politécnica de Madrid)
Medrzycki, Piotr (Centro di Ricerca Agricoltura ed Ambiente)
Teper, Dariusz (Research Institute of Horticulture)
Sgolastra, Fabio (Università di Bologna)

Data:	2019
Resum:	Pesticide use is one of the main causes of pollinator declines in agricultural ecosystems. Traditionally, most laboratory studies on bee ecotoxicology test acute exposure to single compounds. However, under field conditions, bees are often chronically exposed to a variety of chemicals, with potential synergistic effects. We studied the effects of field-realistic concentrations of three pesticides measured in pollen and nectar of commercial melon fields on the solitary bee Osmia bicornis L. We orally exposed females of this species throughout their life span to 8 treatments combining two neonicotinoid insecticides (acetamiprid, imidacloprid) and a triazole fungicide (myclobutanil) via pollen and sugar syrup. We measured pollen and syrup consumption, longevity, ovary maturation and thermogenesis. Pesticide intake was three orders of magnitude higher via syrup than pollen. At the tested concentrations, no synergistic effects emerged, and we found no effects on longevity and ovary maturation. However, all treatments containing imidacloprid resulted in suppressed syrup consumption and drastic decreases in thoracic temperature and bee activity. Our results have important implications for pesticide regulation. If we had measured only lethal effects we would have wrongly concluded that the pesticide combinations containing imidacloprid were safe to O. bicornis. The incorporation of tests specifically intended to detect sublethal effects in bee risk assessment schemes should be an urgent priority. In this way, the effects of pesticide exposure on the dynamics of bee populations in agroecosystems will be better assessed.
Ajuts:	Ministerio de Ciencia e Innovación BES-2014-068732 Ministerio de Ciencia e Innovación AGL2013-47603-C2-1-R
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Scientific reports, Vol. 9 (September 2019) , art. 13770, ISSN 2045-2322
Obra relacionada:	Azpiazu, C., Bosch, J., Viñuela, E. et al. "Author Correction: Chronic oral exposure to field-realistic pesticide combinations via pollen and nectar: effects on feeding and thermal performance in a solitary bee". Sci Rep 11, 16469 (2021) https://doi.org/10.1038/s41598-021-95575-6

Correcció de l'article: https://ddd.uab.cat/record/271683
DOI: 10.1038/s41598-019-50255-4
PMID: 31551470

11 p, 1.7 MB

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