Climate change winners and losers among North American bumblebees

Biology Letters, Год журнала: 2022, Номер 18(6)

Опубликована: Июнь 1, 2022

Mounting evidence suggests that climate change, agricultural intensification and disease are impacting bumblebee health contributing to species’ declines. Identifying how these factors impact insect communities at large spatial temporal scales is difficult, partly because species may respond in different ways. Further, the necessary data must span scales, which usually means they comprise aggregated, presence-only records collected using numerous methods (e.g. diversity surveys, educational collections, citizen-science projects, standardized ecological surveys). Here, we use occupancy models, explicitly correct for biases observation process, quantify effect of changes temperature, precipitation floral resources on site over past 12 decades North America. We find no genus-wide declines occupancy, but do strongly related only weakly or resources. also more likely be change ‘losers’ than ‘winners’ this primarily associated with changing temperature. Importantly, all trends were highly species-specific, highlighting genus community-wide measures not reflect diverse species-specific patterns critical guiding allocation conservation

Язык: Английский

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Different roles of concurring climate and regional land-use changes in past 40 years’ insect trends

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Дек. 12, 2022

Climate and land-use changes are main drivers of insect declines, but their combined effects have not yet been quantified over large spatiotemporal scales. We analysed in the distribution (mean occupancy squares) 390 species (butterflies, grasshoppers, dragonflies), using 1.45 million records from across bioclimatic gradients Switzerland between 1980 2020. found no overall decline, strong increases decreases distributions different species. For that showed strongest (25% quantile), average proportion occupied squares increased 40 years by 0.128 (95% credible interval: 0.123-0.132), which equals an increase mean 71.3% CI: 67.4-75.1%) relative to 40-year occupancy. declines decreased 0.0660 0.0613-0.0709), equalling decrease 58.3% 52.2-64.4%). Decreases were for narrow-ranged, specialised, cold-adapted Short-term associated both climate regional changes. Moreover, interactive confirm various global change can even greater impacts on biodiversity combination than alone. In contrast, clearly related changes, potentially reflecting mixed local land use after 1980. warming however was strongly linked indicating its key role driving trends temperate regions recent decades.

Язык: Английский

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Unravelling the dependence of a wild bee on floral diversity and composition using a feeding experiment

The Science of The Total Environment, Год журнала: 2022, Номер 820, С. 153326 - 153326

Опубликована: Янв. 21, 2022

We investigated nutrition as a potential mechanism underlying the link between floral diversity/composition and wild bee performance. The health, resilience, fitness of bees may be limited by lack nutritionally balanced larval food (pollen), influencing entire population, even if adults are not availability quality their (mainly nectar). hypothesized that nutritional is indirectly connected to species diversity pollen provisions directly driven composition. Therefore, accessibility specific, desirable key plant for larvae might promote populations. Using fully controlled feeding experiment, we simulated different resources could available in various environments, reflecting changes composition caused landscape changes. Suboptimal concentrations certain nutrients produced specific resulted reduced fitness. negative effects were alleviated when scarce added these diets. scarcity was associated with but diversity. Thus, one mechanisms decreased homogenous landscapes imbalance, i.e., presence eaten larvae. Accordingly, provide conceptual representation how can impact populations affecting fitness-related life history traits. Additionally, suggest mixes 'bee-friendly' plants used improve base should composed considering local flora supplement vital considered environment.

Язык: Английский

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Managed honeybees decrease pollination limitation in self-compatible but not in self-incompatible crops

Proceedings of the Royal Society B Biological Sciences, Год журнала: 2022, Номер 289(1972)

Опубликована: Апрель 6, 2022

Modern agriculture is becoming increasingly pollinator-dependent. However, the global stock of domesticated honeybees growing at a slower rate than its demand, while wild bees are declining worldwide. This uneven scenario high pollinator demand and low availability can translate into increasing pollination limitation, reducing yield pollinator-dependent crops. overall assessments crop limitation factors determining magnitude missing. Based on 52 published studies including 30 crops, we conducted meta-analysis comparing in pollen-supplemented versus open-pollinated flowers. We assessed whether this was influenced by (i) presence/absence managed honeybees, (ii) compatibility system (i.e. self-compatible/self-incompatible) (iii) interaction between these two factors. Overall, pollen supplementation increased approximately 34%, indicating sizable limitation. Deployment self-compatibility were associated with lower Particularly, active honeybee management decreased among self-compatible but apparently not self-incompatible These findings indicate that current regimes are, general, inadequate to maximize yield, even when stress need transforming paradigm agricultural landscapes.

Язык: Английский

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Projected decline in European bumblebee populations in the twenty-first century

Nature, Год журнала: 2023, Номер 628(8007), С. 337 - 341

Опубликована: Сен. 13, 2023

Язык: Английский

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Crop diversification for pollinator conservation

Landscape Ecology, Год журнала: 2025, Номер 40(1)

Опубликована: Янв. 11, 2025

Abstract Context Intensive agriculture drives insect decline impacting insect-mediated ecosystem services that support production. Crop diversification shows promise in increasing crop productivity and enhancing services, however, the impact on biodiversity conservation, particularly of pollinators, is unclear. Objectives Here, we synthesize mechanisms current evidence base how spatial temporal diversity crops within across agricultural fields can benefit pollinator biodiversity. Methods We focus research highly intensified regions, Western Europe North America, from which know a lot about decline, but use inspiration tropical regions. Results find higher diversity, with sequentially flowering cultivars, intercropping practices, larger coverage crops, for example through integrating cultivation forgotten, novel, woody increases flower resource availability throughout active flight period pollinators. All practices increase landscape heterogeneity, further enhanced by decreasing field sizes. As result, functional connectivity increases, improves accessibility foraging ranges Conclusions Our review highlights potential various measures supporting pollinating insects without taking land out production, as well limitations, including only subset species may benefit. Empirical suggest could landscape-wide studies are needed to properly evaluate true conservation part solution bending curve decline.

Язык: Английский

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Designing agricultural landscapes for arthropod-based ecosystem services in North America

Advances in ecological research/Advances in Ecological Research, Год журнала: 2021, Номер unknown, С. 191 - 250

Опубликована: Янв. 1, 2021

Язык: Английский

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Experimental heatwaves disrupt bumblebee foraging through direct heat effects and reduced nectar production

Functional Ecology, Год журнала: 2022, Номер 37(3), С. 591 - 601

Опубликована: Дек. 1, 2022

Abstract Heatwaves are an increasingly common extreme weather event across the globe and projected to surge in frequency severity coming decades. Plant‐pollinator mutualisms vulnerable due interacting effects of heat on insect pollinator foraging behaviour their forage plants. We designed experiment parse impact bumblebee mediated directly through air temperature indirectly changes plant rewards. Temperatures simulating a moderate heatwave negatively impacted bumblebees reducing proportion successful bouts, bout duration flower visitation indirect stress reduced nectar production that limited duration. Our experimental results provide mechanistic link between climate, plants pollinators suggest situ conditions from heatwaves could have profound negative consequences for colony persistence maintenance pollination services. Read free Plain Language Summary this article Journal blog.

Язык: Английский

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Extensive regional variation in the phenology of insects and their response to temperature across North America

Ecology, Год журнала: 2023, Номер 104(5)

Опубликована: Март 22, 2023

Climate change models often assume similar responses to temperatures across the range of a species, but local adaptation or phenotypic plasticity can lead plants and animals respond differently temperature in different parts their range. To date, there have been few tests this assumption at scale continents, so it is unclear if large-scale problem. Here, we examined that insect taxa show 96 sites grassy habitats North America. We sampled insects with Malaise traps during 2019-2021 (N = 1041 samples) biomass relation time season. Our samples mostly contained Diptera (33%), Lepidoptera (19%), Hymenoptera (18%), Coleoptera (10%). found strong regional differences phenology response temperature, even within same taxonomic group, habitat type, For example, nematoceran flies increased season central part continent, only showed small increase Northeast seasonal decline Southeast West. At smaller scale, operating on days was correlated up ~75 km apart. Large-scale geographic phenological variation abundance has not studied well, major source controversy previous analyses declines aggregated studies from locations periods. study illustrates predictions about changes populations, causes, will need incorporate temperature.

Язык: Английский

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Effects of agricultural landscape heterogeneity on pollinator visitation rates in Mediterranean oilseed rape

Agriculture Ecosystems & Environment, Год журнала: 2024, Номер 363, С. 108869 - 108869

Опубликована: Янв. 11, 2024

Agricultural intensification, by changing land use and modifying the yearly configuration composition through crop sequences, affects abundance diversity of pollinators and, consequently, pollination. This study aims to assess impact characteristics agricultural landscapes on pollinator in Mediterranean region. We studied response three major wild groups (hoverflies, bumblebees, bees) four landscape characteristics: related composition, namely, equivalent sampling year (eRg), previous (eRgP) percentage seminatural habitats (SNH), one configuration, mean field size (MFS). For this evaluation, we selected twenty-two oilseed rape fields (OSRs) differing surrounding within a 1-km radius. Multimodel inference indicates that variables affect differently. The SNH was most important variable having positive influence while eRgP MFS were found be for bees hoverflies. These data allow us prioritize actions aimed at specific pollinators, improve schemes, promote conservation scale increase extent areas.

Язык: Английский

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