Nutritional stress exacerbates impact of a novel insecticide on solitary bees' behaviour, reproduction and survival

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2022, Volume and Issue: 289(1984)

Published: Oct. 12, 2022

Pesticide exposure and food stress are major threats to bees, but their potential synergistic impacts under field-realistic conditions remain poorly understood not considered in current pesticide risk assessments. We conducted a semi-field experiment examine the single interactive effects of novel insecticide flupyradifurone (FPF) nutritional on fitness proxies solitary bee

Language: Английский

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Impacts of neonicotinoids on biodiversity: a critical review

Environmental Science and Pollution Research, Journal Year: 2023, Volume and Issue: unknown

Published: Dec. 1, 2023

Language: Английский

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Heatwaves increase larval mortality and delay development of a solitary bee

Ecological Entomology, Journal Year: 2024, Volume and Issue: 49(3), P. 433 - 444

Published: Feb. 12, 2024

Abstract Heatwaves are expected to increase in frequency, intensity and duration due climate change. For organisms like insects with discrete development, sensitivity may differ among life stages. Thermal is of particular concern for species bees that provide critical ecosystem services. Although social moderate nest temperatures through worker behaviour, solitary do not thermoregulate their nests, making immobile developing offspring especially vulnerable such extreme events. We studied the effects heatwaves on larval development bee, Osmia lignaria , an important orchard pollinator model bee biology. used a factorial design assess impacts heatwave temperature mortality rate. Larvae were exposed under realistic diel regimes, daytime maxima 31 or 37°C 4 7 days at beginning development. Heatwave strongly affected mortality. Exposure increased by 130%, but cooler 31°C did significantly impact Larval time also was exposure. Compared no‐heatwave‐control, developed faster, slower. Our study reveals importance stage‐specific events suggests timing maximum projected be more detrimental populations than duration.

Language: Английский

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Risk assessments underestimate threat of pesticides to wild bees

Conservation Letters, Journal Year: 2024, Volume and Issue: 17(4)

Published: May 15, 2024

Abstract Ecological risk assessments (ERAs) are crucial when developing national strategies to manage adverse effects from pesticide exposure natural populations. Yet, estimating with surrogate species in controlled laboratory studies jeopardizes the ERA process because populations exhibit intraspecific variation within and across species. Here, we investigate extent which underestimates pesticides on different by conducting a meta‐analysis of all records ECOTOX Knowledgebase for honey bees wild exposed neonicotinoids. We found knowledgebase is largely populated acute lethality data Western bee exhibits LD50 up 6 orders magnitude neonicotinoid exposure. challenge reliability as predictors extrapolating toxicity pollinators recommend solutions address (a)biotic interactions occurring nature that make such extrapolations unreliable process.

Language: Английский

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Exposure to sublethal levels of insecticide-fungicide mixtures affect reproductive success and population growth rates in the solitary bee Osmia cornuta

Environment International, Journal Year: 2024, Volume and Issue: 190, P. 108919 - 108919

Published: July 30, 2024

In agricultural environments, bees are routinely exposed to combinations of pesticides. For the most part, exposure these pesticide mixtures does not result in acute lethal effects, but we know very little about potential sublethal effects and their consequences on reproductive success population dynamics. this study, orally newly emerged females solitary bee Osmia cornuta environmentally-relevant levels acetamiprid (a cyano-substituted neonicotinoid insecticide) singly combination with tebuconazole sterol-biosynthesis inhibitor (SBI) fungicide). The amount feeding solution consumed during phase was lowest mixture. Following exposure, were individually marked released into oilseed rape field cages monitor nesting performance assess success. fungicide or insecticide alone similar those control resulted a 1.3-1.7 net increases. By contrast, mixture showed lower establishment, shortened period, reduced fecundity. Together, led 0.5-0.6 decrease. Female establishment period main bottlenecks. We found no nest provisioning rate, offspring body weight sex ratio. Our study shows how may affect several components and, ultimately, growth. results calls for rethinking pollinator risk assessment schemes, which should target only single compounds also likely co-occur environments.

Language: Английский

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Pesticide impacts on insect pollinators: Current knowledge and future research challenges

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 954, P. 176656 - 176656

Published: Oct. 2, 2024

Language: Английский

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Extreme heat exposure of host plants indirectly reduces solitary bee fecundity and survival

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2024, Volume and Issue: 291(2025)

Published: June 1, 2024

Extreme heat poses a major threat to plants and pollinators, yet the indirect consequences of stress are not well understood, particularly for native solitary bees. To determine how brief exposure extreme flowering affects bee behaviour, fecundity, development survival we conducted no-choice field cage experiment in which Osmia lignaria were provided blueberry ( Vaccinium corymbosum ), phacelia Phacelia tanacetifolia ) white clover Trifolium repens that had been previously exposed either (37.5°C) or normal temperatures (25°C) 4 h during early bloom. Despite similar number open flowers floral visitation frequency between two treatments, female bees with heat-stressed laid approximately 70% fewer eggs than females non-stressed plants. Their progeny received quantities pollen provisions larvae consuming from significantly lower as adults. We also observed trends delayed emergence reduced adult longevity when consumed pollen. This study is first document short, field-realistic bursts host can indirectly affect pollinators their offspring, important implications crop pollination populations.

Language: Английский

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Do pesticide and pathogen interactions drive wild bee declines?

International Journal for Parasitology Parasites and Wildlife, Journal Year: 2022, Volume and Issue: 18, P. 232 - 243

Published: June 13, 2022

There is clear evidence for wild insect declines globally. Habitat loss, climate change, pests, pathogens and environmental pollution have all been shown to cause detrimental effects on insects. However, interactive between these stressors may be the key understanding reported declines. Here, we review literature pesticide pathogen interactions bees, identify knowledge gaps, suggest avenues future research fostering mitigation of observed The limited studies available that pesticides most likely override pathogens. Bees feeding flowers building sheltered nests, are less adapted toxins compared other insects, which potential susceptibility enhanced by reduced number genes encoding detoxifying enzymes with species. date 10 using a fully-crossed design conducted in laboratory social bees Crithidia spp. or Nosema spp., identifying an urgent need test solitary Similarly, since do not necessarily reflect field conditions, semi-field essential if understand their real-world. In conclusion, there empirical (semi-)field range pesticides, pathogens, species better pathways mechanisms underlying interactions, particular relevance fitness population dynamics. Such data indispensable drive forward robust modelling different settings foster predictive science. This will enable put into context more broadly, evaluating relative importance driving Ultimately, this development effective measures protect ecosystem services they supply.

Language: Английский

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Field‐realistic exposure to the novel insecticide flupyradifurone reduces reproductive output in a bumblebee (Bombus impatiens)

Journal of Applied Ecology, Journal Year: 2024, Volume and Issue: 61(8), P. 1932 - 1943

Published: June 18, 2024

Abstract Novel insecticides are continuously being developed for application in response to increased legal restriction of previously and resistance target insects. These novel insecticides, such as flupyradifurone (FPF), remain relatively untested on non‐target organisms, including bumblebees. Further, existing tests honeybees tend focus adult mortality thus sub‐lethal effects, impacts reproductive output, neglected, despite their importance population‐level impacts. To address if the insecticide FPF has effects bumblebee reproduction behaviour, we established microcolonies chronically exposed them field‐realistic concentrations over a 14‐day period. We found that exposure reduced bumblebees' output terms number larvae produced mean mass each larval instar. FPF‐treated bees also stored less sucrose constructed fewer honeypots. However, was similar between control FPF‐exposed microcolonies. Our results show leads and/or delayed development, well nectar storage, without affecting mortality. Policy implications . Insecticides impair can have long‐term consequences, even do not experience Despite this fact, reproduction, mandatorily assessed within regulatory process. findings highlight determining pesticides across developmental stages, using pollinator species other than

Language: Английский

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The neonicotinoid thiamethoxam impairs male fertility in solitary bees, Osmia cornuta

Environmental Pollution, Journal Year: 2021, Volume and Issue: 284, P. 117106 - 117106

Published: April 17, 2021

Language: Английский

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