Cytotoxic and genotoxic effects of a pendimethalin-based herbicide in Apis mellifera

Ecotoxicology and Environmental Safety, Journal Year: 2024, Volume and Issue: 280, P. 116565 - 116565

Published: June 13, 2024

Public concern about the effects of pesticides on non-target organisms has increased in recent years. Nevertheless, there is a limited number studies that address actual toxic herbicides insects. This study investigated side inhabiting agroecosystems and performing essential ecological economic functions such as crop pollination. We analysed morphological alterations gut, Malpighian tubules circulating haemocytes Apis mellifera workers markers exposure effects. A commercial formulation pendimethalin-based herbicide (PND) was administered orally under laboratory conditions at realistic concentration admitted field (330gL

Language: Английский

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Unfavorable urban climatic conditions affects colony performance of an amazonian stingless bee (Apidae: Meliponini)

Insectes Sociaux, Journal Year: 2025, Volume and Issue: unknown

Published: March 19, 2025

Language: Английский

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Effects of short-term heat stress on the thermal tolerance of western corn rootworm (Coleoptera: Chrysomelidae)

Journal of Insect Science, Journal Year: 2025, Volume and Issue: 25(2)

Published: March 1, 2025

Abstract Insect responses to warming temperatures are determined partly by their physiology, which is influenced genetic factors and plasticity induced past temperature exposure. The effect that prior high exposure has on insect thermal tolerance complex depends the degree of heat stress experienced; may allow for individuals tolerate higher through hardening or reduce an individual’s capacity withstand accumulated stress. In this study, we assessed how short exposures a laboratory colony’s geographical origin affected critical maximum (CTmax) western corn rootworm (Diabrotica virgifera LeConte), economically important pest. Despite wide latitudinal range source populations, colonies did not differ in CTmax. Regardless colony origin, found exposing resulted lower CTmax, suggests accumulated. This study highlights experiences at near they experience field, have currently unknown implications its behavior.

Language: Английский

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Environmental drivers of wild bee reproductive performance across a South American dryland ecoregion

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2025, Volume and Issue: 292(2045)

Published: April 1, 2025

The reproductive performance of wild bees is a key determinant their population persistence. However, few studies have directly examined the environmental drivers demographic processes using geographically broad approach. In this study, we explored how biotic and abiotic factors influence reproduction solitary, cavity-nesting across Monte Desert ecoregion in Argentina. Using artificial nests standardized sampling spanning 2000 km 20° latitude, related metrics—nest establishment, offspring production survival—to climate (flower abundance, vegetation cover brood parasitism). Climate was strongest predictor bee performance: warm, humid conditions during nesting period were associated with reduced nest establishment survival. Brood parasitism further Across Desert’s latitudinal gradient, peaked at mid-latitudes, while survival increased towards higher latitudes. These general patterns matched those M. leucografa, most abundant species. findings highlight sensitivity to climatic conditions, particularly period. Our study advances our understanding potential impacts change on Neotropical bees, where extensive areas are experiencing dramatic land-use changes.

Language: Английский

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Latitudinal gradient of thermal safety margin in an Australian damselfly: implications for population vulnerability

Royal Society Open Science, Journal Year: 2025, Volume and Issue: 12(3)

Published: March 1, 2025

The thermal tolerance of species may be exceeded by the predicted temperature increases and thus contribute to extinction. However, impact is thought vary between climate regions across latitudes. Here, we aim establish vulnerability an ectothermic insect a warming estimating safety margin in Ischnura heterosticta damselflies. We measured critical maximum (CTmax) along latitudinal gradient 17° from 21 populations eastern coast Australia. Our results showed that damselflies inhabiting tropical had higher CTmax than temperate increased with increasing mean decreasing latitude. further found positive correlation damselfly parasite number temperature. Body size, body condition sex no on CTmax. projections will narrower tropics compared under 2.6°C annual (future projected - current) increase for years 2061-2080. Therefore, are likely more vulnerable change-driven extinction even though they have relatively Nevertheless, behaviour, adaptation plasticity might mitigate vulnerability.

Language: Английский

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Warmer temperatures reinforce negative land-use impacts on bees, but not on higher insect trophic levels

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2025, Volume and Issue: 292(2046)

Published: May 1, 2025

Climate and land-use change are major drivers of insect decline, yet their interactive effects on richness abundance, especially across trophic levels, remain poorly understood. Here, we investigate how temperature land use shape communities spatial scales from flowering plants cavity-nesting bees to hunting wasps, antagonists parasitism rates. Using trap nests a space-for-time approach, surveyed 179 plots spanning four habitat types (forest, grassland, arable settlements) 60 study regions in Germany covering semi-natural, agricultural urban landscapes. Bee abundance responded climate–land-use interactions scales, being higher with warmer local daytime temperatures overall climates, but only less intensive uses. In contrast, elevated night-time negatively affected bees. Higher levels benefited more consistently climates than lower were by high temperatures. Parasitism rates lowest similar habitats within semi-natural regions, suggesting that landscape-scale processes buffer effects. Our findings underscore the importance considering for diurnal insects suggest rising may exacerbate negative impacts pollinators.

Language: Английский

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Bees travelling south: Climate‐induced range shifts and suitable habitat losses in south‐eastern neotropics

Journal of Biogeography, Journal Year: 2024, Volume and Issue: 51(11), P. 2259 - 2273

Published: Aug. 15, 2024

Abstract Aim To provide an assessment of climate change impacts on a set wild pollinators restricted to one the regions with greatest diversity bees in world. Also, we aimed test whether functional groups responded differently projections. Location South‐eastern South America (SES). Taxon Bees (Hymenoptera: Apidae sensu lato). Methods We selected 18 species mostly SES region, modelled their distributions and assessed possible near future (2050) richness shifts range centroids. Potential related different were evaluated through t ‐tests. Results was projected decrease northernmost increase southward. Most bee predicted shift centroids towards south‐west south, while suitable stable areas found southern Brazil. also higher proportional losses for eusocial compared solitary ones, generalists showed slightly lower gains than specialists. Main Conclusion are likely undergo changes future, at northern portions southward increases. The identified Brazil underscore importance conservation efforts particularly natural grasslands – endangered habitat high diversity. Although our results suggest vulnerability traditionally considered more resilient, it is essential acknowledge that other factors, including mutualists availability, behavioural particularities, phenology size, must be determinants ongoing change.

Language: Английский

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Effects of heat shocks, heat waves, and sustained warming on solitary bees

Frontiers in Bee Science, Journal Year: 2024, Volume and Issue: 2

Published: July 3, 2024

Along with higher average temperatures, global climate change is expected to lead more frequent and intense extreme heat events, these different types of warming are likely differ in their effects on bees. Although solitary bees comprise >75% bee species, despite ecological economic value as pollinators, a literature search revealed that only 8% studies responses involve Here we review have addressed how affected by three main vary magnitude duration: shocks, waves, sustained warming. We focus direct physiological behavioral bees, rather than the underlying mechanisms. find shocks received little attention both terms number relative social all those examine single genus, Megachile . This work has shown heat-shocked eggs, larvae, pupae tend upregulate shock protein genes, while at adult stage can increase mortality male potentially altering population sex ratios. waves even less study, but few suggest events larval slow development time, may not be able physiologically acclimate wave conditions increasing critical thermal maxima. Finally, warming, which been relatively well-studied speed rate, reduce body mass, mortality, alter foraging behavior. Our reveals knowledge gaps and, broadly, unmanaged To improve our ability anticipate consequences for encourage research examines short-term, incorporates greater realism complexity.

Language: Английский

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Thermal tolerance and sociality explain the interactive role of bees in a pollination network

Oikos, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 18, 2024

Numerous studies have explored the organization of pollination networks and factors influencing these interactions at various spatial temporal scales. Within networks, species vary in their significance influence on one another (i.e. interactive roles), understanding which determine this enables us to better comprehend interconnected relationships that drive resilience diversity ecosystems. Nevertheless, despite ectothermic nature bees potential impact social behaviour bee foraging patterns plants, amount theoretical empirical information available regarding how thermal tolerance limits sociality affect roles within remains relatively scarce. In study, we assess physiological (thermal tolerance) traits shape role a network coastal environment Gulf Mexico, Mexico. For sociality, classified as eusocial, subsocial, solitary while for tolerance, used both warmest critical maximum, CT max ) coldest minimum, m temperature. general, found bees' explain studied. Specifically, eusocial had greater than subsocial bees. Moreover, observed with lower ax higher less heat cold tolerant) role. Our findings suggest inherent life history are valuable predicting may implications ecological, functional evolutionary processes ecosystems, including impacts resulting from climate change.

Language: Английский

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The heat is on: impact of heat waves on critical thermal maxima in larvae and adults of solitary bee Osmia bicornis (Hymenoptera: Megachilidae)

Apidologie, Journal Year: 2024, Volume and Issue: 55(5)

Published: Sept. 27, 2024

Abstract Extreme temperature events, such as heat waves, are increasing in frequency, magnitude, and duration. These events believed to contribute pollinator decline. Critical thermal maxima (CT max ) is a key physiological trait for understanding an organism’s ecology predicting its responses changes climate. In this study, we investigated whether different life stages with distinct thermoregulatory behaviors differ their CT the solitary bee Osmia bicornis , one of most common important pollinators Central Europe. Additionally, tested influence excessively high temperatures, on . We found varied among stages, adults exhibiting higher than larvae. Both females males adult bees showed negative correlation between body mass. Interestingly, exposed waves during larval stage did not exhibit significant shifts results suggest that may have limited capacity enhance tolerance response prior exposure.

Language: Английский

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