Bees exposed to climate change are more sensitive to pesticides
Albacete, Sergio (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sancho Blanco, Gonzalo (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Azpiazu, Celeste (Universitat Autònoma de Barcelona)
Rodrigo Domínguez, Anselm (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Molowny-Horas, Roberto (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sgolastra, Fabio (Alma Mater Studiorum Università di Bologna. Dipartimento di Scienze e Tecnologie Agro-Alimentari)
Bosch, Jordi 1961- (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2023
Resum:	Bee populations are exposed to multiple stressors, including land-use change, biological invasions, climate change, and pesticide exposure, that may interact synergistically. We analyze the combined effects of climate warming and sublethal insecticide exposure in the solitary bee Osmia cornuta. Previous Osmia studies show that warm wintering temperatures cause body weight loss, lipid consumption, and fat body depletion. Because the fat body plays a key role in xenobiotic detoxification, we expected that bees exposed to climate warming scenarios would be more sensitive to pesticides. We exposed O. cornuta females to three wintering treatments: current scenario (2007-2012 temperatures), near-future (2021-2050 projected temperatures), and distant-future (2051-2080). Upon emergence in spring, bees were orally exposed to three sublethal doses of an insecticide (Closer, a. i. sulfoxaflor; 0, 4. 55 and 11. 64 ng a. i. /bee). We measured the combined effects of wintering and insecticide exposure on phototactic response, syrup consumption, and longevity. Wintering treatment by itself did not affect winter mortality, but body weight loss increased with increasing wintering temperatures. Similarly, wintering treatment by itself hardly influenced phototactic response or syrup consumption. However, bees wintered at the warmest temperatures had shorter longevity, a strong fecundity predictor in Osmia. Insecticide exposure, especially at the high dose, impaired the ability of bees to respond to light, and resulted in reduced syrup consumption and longevity. The combination of the warmest winter and the high insecticide dose resulted in a 70% longevity decrease. Smaller bees, resulting from smaller pollen-nectar provisions, had shorter longevity suggesting nutritional stress may further compromise fecundity in O. cornuta. Our results show a synergistic interaction between two major drivers of bee declines, and indicate that bees will become more sensitive to pesticides under the current global warming scenario. Our findings have important implications for pesticide regulation and underscore the need to consider multiple stressors to understand bee declines.
Ajuts:	Agencia Estatal de Investigación RTI2018-098399-B-I00 Agencia Estatal de Investigación PID2021-128938OB-I00 Agencia Estatal de Investigación PRE2019-088817 Agencia Estatal de Investigación PRE2019-090375
Nota:	Altres ajuts: acords transformatius de la UAB
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
Matèria:	Body size ; Climate change ; Global warming ; Longevity ; Nutritional stress ; Osmia cornuta ; Pesticide exposure ; Sulfoxaflor ; Synergistic effects ; Toxicity
Publicat a:	Global change biology, Vol. 29, Issue 22 (November 2023) , p. 6157-6433, ISSN 1365-2486

DOI: 10.1111/gcb.16928

13 p, 4.5 MB

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