No impact of neonicotinoids on male solitary bees Osmia cornuta under semi‐field conditions

Strobl, Verena; Bruckner, Selina; Radford, Sarah; Wolf, Sarah; Albrecht, Matthias; Villamar‐Bouza, Laura; Maitip, Jakkrawut; Kolari, Eleonora; Chantawannakul, Panuwan; Glauser, Gaétan; Williams, Geoffrey R.; Neumann, Peter; Straub, Lars (2021). No impact of neonicotinoids on male solitary bees Osmia cornuta under semi‐field conditions. Physiological Entomology, 46(1), pp. 105-109. Wiley 10.1111/phen.12349

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The ubiquitous use of agrochemicals is one driver for the ongoing loss of insect biomass and diversity. Data show that field‐realistic concentrations of neonicotinoid insecticides can negatively affect both population density and the fitness of solitary bees. However, the underlying mechanisms for these effects remain poorly understood. Here, using an established semi‐field experimental set‐up and Osmia cornuta as a solitary bee model, we examined the effects of field‐realistic concentrations of a common neonicotinoid insecticide (clothianidin) on male larvae and adults. Besides measuring lethal (i.e., overwintering success and adult survival) and sub‐lethal endpoints (i.e., emergence mass and emergence duration), we examined, for the first time, potential effects on the male reproductive physiology of a solitary bee (i.e., sperm quantity and viability). The data revealed no significant effects on any of the measured response variables. This may be due to the low degree of clothianidin exposure (0.56 ng g−1) and/or the apparent low susceptibility of solitary bee larvae to neonicotinoids. Furthermore, it is conceivable that ideal foraging conditions, combined with optimal weather and lack of other environmental stressors, may have improved the ability of bees to cope with the insecticide. To reliably assess and understand the environmental hazards of agrochemicals, a holistic approach, including laboratory, semi‐field and field data is required. Knowledge of underlying mechanisms will help to mitigate the current global declines of insect populations.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH)
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Institute of Bee Health

UniBE Contributor:

Strobl, Verena; Neumann, Peter and Straub, Lars

Subjects:

500 Science > 590 Animals (Zoology)
600 Technology > 630 Agriculture

ISSN:

0307-6962

Publisher:

Wiley

Language:

English

Submitter:

Anna Papach

Date Deposited:

24 Mar 2021 17:26

Last Modified:

24 Mar 2021 17:36

Publisher DOI:

10.1111/phen.12349

BORIS DOI:

10.48350/153507

URI:

https://boris.unibe.ch/id/eprint/153507

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