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Ecological Intelligence

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bumblebees

Peer-reviewed Europe

Heat during pupation kept killing bumblebees after emergence

Evidence
Peer-reviewed
Geography
Controlled laboratory experiment, Germany
System
Pollinator developmental ecology

WHAT THE EVIDENCE SAYS

In vitro Bombus terrestris pupae exposed to cyclic 37°C or 38°C heat had lower emergence than the 34°C treatment, and surviving adults showed elevated post-emergence mortality and more deformities at the highest treatment. Effects therefore persisted beyond the developmental exposure window.

WHY IT MATTERS / OUR READ

Heat risk can carry across life stages. Monitoring only immediate survival during an extreme event can miss delayed demographic costs in pollinators and other insects.

CAVEATS / UNCERTAINTY

This is a controlled experiment on one model bumblebee species. The imposed thermal regimes simplify field conditions, and individual survival effects do not directly quantify colony- or population-level consequences.

SOURCE

Communications Biology
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EvidencePeer-reviewedGeographyControlled laboratory experiment, GermanySystemPollinator developmental ecology WHAT THE EVIDENCE SAYS In vitro Bombus terrestris pupae exposed to cyclic 37°C or 38°C heat had lower emergence than the

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Peer-reviewed Europe

Europe — Bumblebee habitat loss becomes clearer when climate is isolated from other pressures

Evidence
Peer-reviewed
Geography
Europe
System
Bumblebee and pollinator habitat

WHAT THE EVIDENCE SAYS

Researchers compared factual and counterfactual climate scenarios from 1901–2019 for 47 European bumblebee species. Climate change reduced community-level ecological suitability by about 5% on average and by as much as 19% locally, with pronounced losses in southern and lowland central Europe. Higher-altitude gains in Alpine and Boreal regions partially offset losses elsewhere.

WHY IT MATTERS / OUR READ

Pollinator decline is often discussed as one blended outcome of land use, pesticides and climate. Separating one pressure clarifies where climate is already reshaping suitability and also shows why apparent gains in some regions should not be used to erase losses in others.

CAVEATS / UNCERTAINTY

The attribution depends on ecological niche models, historical occurrence records and reconstructed climate scenarios. Habitat suitability is not the same as observed abundance, reproductive success or population viability.

SOURCE

Nature Climate Change · Original evidence
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Counterfactual modelling attributes an average 5% reduction in community-level ecological suitability to climate change across Europe, with local losses up to 19%.

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