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Published on: October 9, 2017
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Do pesticide and pathogen interactions drive wild bee declines?
Lars Straub1, Verena Strobl1, Orlando Yañez1
1Institute of Bee Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
Summary
Pesticide and pathogen interactions negatively impact wild bees, with pesticide effects often dominating. More field research is crucial to understand these combined threats and protect vital pollinators.
Area of Science:
- Ecology
- Environmental Science
- Toxicology
Background:
- Global insect declines are evident, with habitat loss, climate change, and pollution as known factors.
- Interactive effects of multiple stressors, particularly pesticides and pathogens, are critical for understanding insect population dynamics.
- Wild bees are potentially more susceptible to toxins due to their feeding and nesting habits and fewer detoxifying genes.
Purpose of the Study:
- To review existing literature on pesticide-pathogen interactions in wild bees.
- To identify knowledge gaps and propose future research directions for mitigating wild bee declines.
- To assess the relative importance of these interactions in the context of broader environmental stressors.
Main Methods:
- Literature review of studies on pesticide and pathogen interactions in wild bees.
- Analysis of laboratory-based, fully-crossed experimental designs.
- Identification of research needs, including solitary bees, diverse pathogens, and field studies.
Main Results:
- Current limited research suggests pesticide impacts often override pathogen effects in bees.
- Most existing studies are laboratory-based, focusing on social bees and specific pathogens (Crithidia spp., Nosema spp.).
- A significant knowledge gap exists regarding interactions in solitary bees and with other pathogens under realistic conditions.
Conclusions:
- Empirical field and semi-field studies are urgently needed to investigate pesticide-pathogen interactions across various species and conditions.
- Understanding these interactions is vital for accurate ecological modeling and developing effective conservation strategies for wild bees.
- Such research will help contextualize pesticide and pathogen impacts alongside other stressors driving insect declines and inform mitigation efforts.
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