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6 results for “Osmia cornuta”
Effects of proline on survival, locomotion, and amino acid haemolymph composition of Osmia cornuta (Latreille, 1805)
<p>This repository contains data of survival, feed intake, behaviour and concentration of haemolymph amino acids of mason bees (<em>Osmia cornuta</em> Latreille) fed artificial diets made of sucrose only (control group) or sucrose solution enriched with 10mM proline (proline group). </p>
The neonicotinoid thiamethoxam impairs male fertility in solitary bees, Osmia cornuta
<p>The ongoing loss of global biodiversity is endangering ecosystem functioning and human food security. While environmental pollutants are well known to reduce fertility, the potential effects of common neonicotinoid insecticides on insect fertility remain poorly understood. Here, we show that field-realistic neonicotinoid exposure can drastically impact male insect fertility. In the laboratory, male and female solitary bees <em>Osmia cornuta</em> were exposed to four concentrations of the neonicotinoid thiamethoxam to measure survival, food consumption, and sperm traits. Despite males being exposed to higher dosages of thiamethoxam, females revealed an overall increased hazard rate for survival; suggesting sex-specific differences in toxicological sensitivity. All tested sublethal concentrations (i.e., 1.5, 4.5, and 10 ng g<sup>-1</sup>) reduced sperm quantity by 57% and viability by 42% on average, with the lowest tested concentration leading to a reduction in total living sperm by 90%. As the tested sublethal concentrations match estimates of global neonicotinoid pollution, this reveals a plausible mechanism for population declines, thereby reflecting a realistic concern. An immediate reduction in environmental pollutants is required to decelerate the ongoing loss of biodiversity.</p>
No impact of neonicotinoids on male solitary bees Osmia cornuta under semi-field conditions
<p>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 <em>Osmia cornuta</em> 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<sup>−1</sup>) 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.</p>
No impact of neonicotinoids on male solitary bees Osmia cornuta under semi-field conditions
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Data from: Not every sperm counts: male fertility in solitary bees, Osmia cornuta
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The neonicotinoid thiamethoxam impairs male fertility in solitary bees, Osmia cornuta
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