Evidence of exploitative competition between honey bees and native bees in two California landscapes

Journal of Animal Ecology, Год журнала: 2023, Номер 92(9), С. 1802 - 1814

Опубликована: Июнь 29, 2023

Human-mediated species introductions provide real-time experiments in how communities respond to interspecific competition. For example, managed honey bees Apis mellifera (L.) have been widely introduced outside their native range and may compete with for pollen nectar. Indeed, multiple studies suggest that overlap use of floral resources. However, resource negatively impact collection by bees, availability must also decline, few investigate impacts bee competition on visits simultaneously. In this study, we increasing abundance visitation patterns, diets, nectar two Californian landscapes: wildflower plantings the Central Valley montane meadows Sierra. We collected data flowers, availability, carried bodies across sites Sierra Valley. then constructed plant-pollinator networks assess impacted perceived apparent (PAC), a measure niche overlap, pollinator specialization (d'). compared PAC values against null expectations address whether observed changes were greater or less than what would expect given relative abundances interacting partners. find clear evidence exploitative both ecosystems based following results: (1) increased between (2) led decreased (3) responded shifting visits, some becoming more specialized others generalized depending ecosystem taxon considered. Although can adapt coexistence is tenuous will depend availability. Preserving augmenting resources therefore essential mitigating negative California ecosystems, decreases flowers alters diets potential implications conservation wildlands management.

Язык: Английский

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Thiacloprid impairs honeybee worker learning and memory with inducing neuronal apoptosis and downregulating memory-related genes

The Science of The Total Environment, Год журнала: 2023, Номер 885, С. 163820 - 163820

Опубликована: Май 2, 2023

Язык: Английский

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Bees exposed to climate change are more sensitive to pesticides

Global Change Biology, Год журнала: 2023, Номер 29(22), С. 6248 - 6260

Опубликована: Сен. 1, 2023

Bee populations are exposed to multiple stressors, including land-use change, biological invasions, climate and pesticide exposure, that may interact synergistically. We analyze the combined effects of warming sublethal insecticide exposure in solitary bee Osmia cornuta. Previous studies show warm wintering temperatures cause body weight loss, lipid consumption, fat depletion. Because plays a key role xenobiotic detoxification, we expected bees scenarios would be more sensitive pesticides. O. cornuta females three treatments: current scenario (2007-2012 temperatures), near-future (2021-2050 projected distant-future (2051-2080). Upon emergence spring, were orally doses an (Closer, a.i. sulfoxaflor; 0, 4.55 11.64 ng a.i./bee). measured on phototactic response, syrup longevity. Wintering treatment by itself did not affect winter mortality, but loss increased with increasing temperatures. Similarly, hardly influenced response or consumption. However, wintered at warmest had shorter longevity, strong fecundity predictor Osmia. Insecticide especially high dose, impaired ability respond light, resulted reduced consumption The combination dose 70% longevity decrease. Smaller bees, resulting from smaller pollen-nectar provisions, suggesting nutritional stress further compromise Our results synergistic interaction between two major drivers declines, indicate will become pesticides under global scenario. findings have important implications for regulation underscore need consider stressors understand declines.

Язык: Английский

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Flowering resources modulate the sensitivity of bumblebees to a common fungicide

The Science of The Total Environment, Год журнала: 2022, Номер 829, С. 154450 - 154450

Опубликована: Март 9, 2022

Bees are exposed to various stressors, including pesticides and lack of flowering resources. Despite potential interactions between these the impacts on bees generally assumed be consistent across bee-attractive crops, regulatory risk assessments neglect with Furthermore, fungicides rarely examined in peer-reviewed studies, although often that most to. In a full-factorial semi-field experiment 39 large flight cages, we assessed single combined globally used azoxystrobin-based fungicide Amistar® three types resources (Phacelia, buckwheat, floral mix) Bombus terrestris colonies. Although Amistar is classified as bee-safe, exposure through Phacelia monocultures reduced adult worker body mass colony growth (including 55% decline workers an 88% males), while had no impact colonies buckwheat or mix cages. hampered survival fecundity irrespective exposure. This shows bumblebees require access complementary species gain both fitness tolerance resource-dependent. Our findings call for further research how different plants affect their pesticide improve guidelines inform choice cultivated safeguard pollinators.

Язык: Английский

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Bumblebees are resilient to neonicotinoid-fungicide combinations

Environment International, Год журнала: 2024, Номер 186, С. 108608 - 108608

Опубликована: Март 27, 2024

Bumblebees are among the most important wild bees for pollination of crops and securing wildflower diversity. However, their abundance diversity have been on a steady decrease in last decades. One factors leading to decline is frequent use plant protection products (PPPs) agriculture, which spread into forests natural reserves. Mixtures different PPPs pose particular threat because possible synergistic effects. While there comparatively large body studies effects honeybees, we still lack data bees. We here investigated influence fungicide Cantus® Gold (boscalid/dimoxystrobin), neonicotinoid insecticide Mospilan® (acetamiprid) combination bumblebees. Cognitive performance foraging flights bumblebees were studied. They essential provisioning survival colony. introduce novel method testing four treatments simultaneously same colony, minimizing inter-colony differences. For this, successfully quartered colony moved queen daily between compartments. appeared astonishingly resilient tested or they developed mechanisms detoxification. Neither learning capacity nor flight activity inhibited by treatment with single combination.

Язык: Английский

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Beekeeping under climate change

Journal of Apicultural Research, Год журнала: 2023, Номер 62(5), С. 963 - 968

Опубликована: Окт. 5, 2023

There is consensus that climate change one of the grand challenges facing humanity in twenty first century, inevitably most confided and undeniably pressing. Profound effects are inevitable global agriculture, beekeeping certainly no exemption. Indeed, extreme weather natural disasters have already had an impact on honey bees. Thus, it appears evident will constitute a key stress factor for managed bees beekeepers alike contributing to increased colony losses reduced income. Here, we review literature beekeeping. Based literature, at present there inclusive strategy adequately deal with bring. call such briefly list main future due changing as well suggest possible countermeasures. Ultimately, its mitigation insufficiently understood context. This calls respective concerted efforts scientists, beekeepers, other stakeholders find sustainable Such require evidence-based measures increasing change.

Язык: Английский

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Spatio-temporal variation in pollen collected by honey bees (Apis mellifera) in rural-urban mosaic landscapes in Northern Europe

PLoS ONE, Год журнала: 2025, Номер 20(2), С. e0309190 - e0309190

Опубликована: Фев. 4, 2025

Pollen is a source of protein, lipids, vitamins and minerals for bees other flower-visiting insects. The composition macro- micronutrients pollen vary among different plant species. Honey are long-distance foragers, collecting nectar from plants within several kilometers their hive. Availability the foraging range honey highly dynamic, changing seasonally, across landscapes. In present study, aim was to investigate collected by in rural-urban landscape mosaics typical Northern Europe. Samples corbiculate were 3–9 times during growing season citizen scientist bee keepers total 25 observation apiaries Denmark 2014–2015. Palynological analysis conducted identifying 500 grains per sample type (mostly genus). diversity denoted number types sample, while relative abundance calculated as proportional representation type, if found >1% sample. quantity study years sites measured occurrence each (number samples with present) (total grains). variable, effects season, year, area green urban spaces. terms quantity, few key occurred repeatedly abundantly samples. Only 17 >15 These consistent may impact colony health, hence decisions bees, especially late summer. However, bulk colonies came limited sources, regardless year context Denmark.

Язык: Английский

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Honey bee immune response to trace concentrations of clothianidin goes beyond the macronutrients found in artificial diets

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Март 28, 2025

Honey bees (Apis mellifera) often encounter a variety of stressors in their environment, including poor nutrition and pesticides. These interact can be exacerbated large-scale agroecosystems. We investigated how diets varying macronutrient ratios affect nurse bee susceptibility to pesticide stressors. Nurse were fed trace concentrations clothianidin (CLO), neonicotinoid insecticide known have sublethal lethal effects on honey bees, after newly emerged given proteins lipids, natural pollen diet, or sucrose solution diet. Bees had improved longevity, physiology, enzyme activity, gene expression related detoxification. The artificial helped improve health physiology but did little promote detoxification enzymes genes. There was no effect the CLO treatments its own, there an interactive between our higher treatment longevity vitellogenin expression. Our results suggest that (1) exposure even with undermine adult (2) macronutrients help other nutrients pollen, such as potentially phytochemicals, are more directly linked tolerance stress.

Язык: Английский

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Polyfloral nutritional resources promote bumble bee colony development after exposure to a pesticide mixture

Ecotoxicology and Environmental Safety, Год журнала: 2025, Номер 296, С. 118170 - 118170

Опубликована: Апрель 11, 2025

Язык: Английский

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Strategies and techniques to mitigate the negative impacts of pesticide exposure to honey bees

Environmental Pollution, Год журнала: 2022, Номер 318, С. 120915 - 120915

Опубликована: Дек. 20, 2022

Язык: Английский

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