Low toxicity crop fungicide (fenbuconazole) impacts reproductive male quality signals leading to a reduction of mating success in a wild solitary bee

Boff, Samuel; Conrad, Taina; Raizer, Josué; Wehrhahn, Marten; Bayer, Melis; Friedel, Anna; Theodorou, Panagiotis; Schmitt, Thomas; Lupi, D.

doi:10.1111/1365-2664.14169

Cited by 11 publications

(2 citation statements)

References 73 publications

(127 reference statements)

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“…Insecticide-induced changes in the chemical profiles might be the result of a disruption of biosynthetic pathways, similar to a downregulation of the immune system. Indeed, pesticides have been shown to change the chemical profile and to disrupt mating in solitary bees [29]. Furthermore, the chemical profile and the total amount of chemical compounds royalsocietypublishing.org/journal/rspb Proc.…”

Section: (A) Diet and Insecticide Affect Individual Physiological Pro...mentioning

confidence: 99%

“…Field-realistic doses of neonicotinoids have been shown to reduce growth and reproduction in bumblebee colonies [21]. In the solitary bee Osmia bicornis, field-realistic doses of clothianidin decreased antennal sensitivity [28] and reduced mating success of males because of a disruption of pheromones [29]. Furthermore, imidacloprid and clothianidin impaired behavioural patterns, such as foraging in solitary bees [28] and bumblebees [30], and memory and learning in bumblebees [31].…”

Section: Introductionmentioning

confidence: 99%

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Land-use-associated stressors interact to reduce bumblebee health at the individual and colony level

Straub,

Birkenbach,

Leonhardt

et al. 2023

Proc. R. Soc. B.

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In agricultural landscapes, bees face a variety of stressors, including insecticides and poor-quality food. Although both stressors individually have been shown to affect bumblebee health negatively, few studies have focused on stressor interactions, a scenario expected in intensively used agricultural landscapes. Using the bumblebee Bombus terrestris , a key pollinator in agricultural landscapes, we conducted a fully factorial laboratory experiment starting at nest initiation. We assessed the effects of food quality and insecticides, alone and in interaction, on health traits at various levels, some of which have been rarely studied. Pollen with a diluted nutrient content (low quality) reduced ovary size and delayed colony development. Wing asymmetry, indicating developmental stress, was increased during insecticide exposure and interactions with poor food, whereas both stressors reduced body size. Both stressors and their interaction changed the workers’ chemical profile and reduced worker interactions and the immune response. Our findings suggest that insecticides combined with nutritional stress reduce bumblebee health at the individual and colony levels, thus possibly affecting colony performance, such as development and reproduction, and the stability of plant–pollinator networks. The synergistic effects highlight the need of combining stressors in risk assessments and when studying the complex effects of anthropogenic stressors on health outcomes.

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Section: (A) Diet and Insecticide Affect Individual Physiological Pro...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Land-use-associated stressors interact to reduce bumblebee health at the individual and colony level

Straub,

Birkenbach,

Leonhardt

et al. 2023

Proc. R. Soc. B.

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Advances in Catalytic Asymmetric Construction of Quaternary Stereogenic Centers by Conjugate Addition to β,β‐Disubstituted Nitroalkenes

et al. 2023

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Quaternary stereogenic centers are of great importance because of their prevalence in a series of bioactive natural products and pharmaceuticals. Although the catalytic asymmetric construction of these highly congested centers poses a formidable challenge, this field has been extensively explored in the past few decades, and several elegant strategies, such as the asymmetric conjugate addition to β,β‐disubstituted nitroalkenes, have been developed. The resultant β‐nitro quaternary stereocenters can be conveniently transformed into the corresponding β‐amino quaternary stereocenters commonly found in bioactive compounds. This review summarizes the recent advances in the construction of all‐carbon quaternary or hetero‐carbon quaternary stereocenters via metal‐catalyzed and organocatalyzed asymmetric conjugate addition to β,β‐disubstituted nitroalkenes, focusing on the scope, applications, and mechanisms of these reactions.

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Chemical and Mechanical Signals Trigger Courtship in the Wild Large-Headed Resin Bee Heriades truncorum

2022

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Hymenopteran females are mostly highly selective, choosing their mating partner according to male quality signals, and may also signal their fertility through chemical advertisement. Male insects, in turn, often display a complex set of courtship behaviors to allure females to mate. In this study we explored the mechanisms triggering courtship behaviors in the oligolectic bee Heriades truncorum. In this species, males perform wing fanning followed by a sideways rocking motion before copulation. We tested the role of chemical cues in partner recognition by exposing males to dead females washed from cuticular extracts (i.e., sex pheromones) that were posteriorly coated, or not, with an extract of unmated females. Additionally, we experimentally reduced male wing length to test whether wing fanning was responsible for triggering sideways rocking motions. We found males to interact more often with females coated by extracts from unmated females, and to display wing fanning in the presence of these pheromones. Male wing fanning was important to perform sideways rocking motions, which are an essential behavior for successful mating and possibly an element used by females to evaluate male quality. Our study shows that both chemical and mechanical signals from female and male bees, respectively, are important elements in the mating system of H. truncorum.

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Low toxicity crop fungicide (fenbuconazole) impacts reproductive male quality signals leading to a reduction of mating success in a wild solitary bee

Cited by 11 publications

References 73 publications

Land-use-associated stressors interact to reduce bumblebee health at the individual and colony level

Land-use-associated stressors interact to reduce bumblebee health at the individual and colony level

Advances in Catalytic Asymmetric Construction of Quaternary Stereogenic Centers by Conjugate Addition to β,β‐Disubstituted Nitroalkenes

Chemical and Mechanical Signals Trigger Courtship in the Wild Large-Headed Resin Bee Heriades truncorum

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