[en] Floral resource loss and pesticide exposure are major threats to bees in intensively managed agroecosystems, but interactions among these drivers remain poorly understood. Altered composition and lowered diversity of pollen nutrition may reinforce negative pesticide impacts on bees. Here we investigated the development and survival of the solitary bee Osmia bicornis provisioned with three different pollen types, as well as a mixture of these types representing a higher pollen diversity. We exposed bees of each nutritional treatment to five pesticides at different concentrations in the laboratory. Two field-realistic concentrations of three nicotinic acetylcholine receptor (nAChR) modulating insecticides (thiacloprid, sulfoxaflor and flupyradifurone), as well as of two fungicides (azoxystrobin and tebuconazole) were examined. We further measured the expression of two detoxification genes (CYP9BU1, CYP9BU2) under exposure to thiacloprid across different nutrition treatments as a potential mechanistic pathway driving pesticide-nutrition interactions. We found that more diverse pollen nutrition reduced development time, enhanced pollen efficacy (cocoon weight divided by consumed pollen weight) and pollen consumption, and increased weight of O. bicornis after larval development (cocoon weight). Contrary to fungicides, high field-realistic concentrations of all three insecticides negatively affected O. bicornis by extending development times. Moreover, sulfoxaflor and flupyradifurone also reduced pollen efficacy and cocoon weight, and sulfoxaflor reduced pollen consumption and increased mortality. The expression of detoxification genes differed across pollen nutrition types, but was not enhanced after exposure to thiacloprid. Our findings highlight that lowered diversity of pollen nutrition and high field-realistic exposure to nAChR modulating insecticides negatively affected the development of O. bicornis, but we found no mitigation of negative pesticide impacts through increased pollen diversity. These results have important implications for risk assessment for bee pollinators, indicating that negative effects of nAChR modulating insecticides to developing solitary bees are currently underestimated.
Disciplines :
Agriculture & agronomy Entomology & pest control Zoology
Author, co-author :
Schwarz, Janine M; Agroscope, Agroecology and Environment, Zurich, Switzerland, ETH Zurich, Institute for Terrestrial Ecosystems, Ecosystem Management, Zurich, Switzerland. Electronic address: janine.schwarz130790@gmail.com
Knauer, Anina C; Agroscope, Agroecology and Environment, Zurich, Switzerland
Alaux, Cedric; INRAE, Abeilles et Environnement, Avignon, France
Barascou, Lena; INRAE, Abeilles et Environnement, Avignon, France
Barraud, Alexandre ; Université de Mons - UMONS > Faculté des Science > Service de Zoologie
Dievart, Virginie; INRAE, Abeilles et Environnement, Avignon, France
Ghazoul, Jaboury; ETH Zurich, Institute for Terrestrial Ecosystems, Ecosystem Management, Zurich, Switzerland
Michez, Denis ; Université de Mons - UMONS > Faculté des Science > Service de Zoologie
Albrecht, Matthias; Agroscope, Agroecology and Environment, Zurich, Switzerland
Language :
English
Title :
Diverse pollen nutrition can improve the development of solitary bees but does not mitigate negative pesticide impacts.
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