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Climate change contributes to widespread declines among bumble bees across continents
Peter Soroye1, Tim Newbold2, Jeremy Kerr3
1Department of Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada. peter.soroye@gmail.com.
Summary
Climate change impacts bumble bee populations. Rising temperatures exceeding historical tolerances increase extinction risk and alter species distribution, independent of land use changes.
Area of Science:
- Ecology
- Climate Change Biology
- Conservation Biology
Background:
- Climate change is a significant driver of biodiversity loss.
- Species' physiological tolerances to temperature and precipitation are critical for survival and distribution.
- Bumble bees are important pollinators facing population declines.
Purpose of the Study:
- To investigate the impact of climate change on bumble bee extinction and colonization dynamics.
- To determine if exceeding historical temperature tolerances predict species' range shifts.
- To develop a method for predicting climate change-related population dynamics.
Main Methods:
- Utilized long-term data for 66 bumble bee species across North America and Europe.
- Analyzed the relationship between increasing frequency of extreme temperatures and species' extinction/colonization likelihoods.
- Developed a spatially explicit modeling approach to predict population dynamics.
Main Results:
- Increasing frequencies of hotter temperatures significantly predict higher local extinction risk for bumble bee species.
- Exceeding historical temperature tolerances also influences colonization probability and species richness.
- These climate effects on bumble bee populations are independent of land-use changes.
Conclusions:
- Rising temperatures exceeding historical tolerances are a key mechanism driving bumble bee decline and range shifts.
- The findings explain observed geographical range losses and expansions across continents.
- This mechanism likely contributes to broader biodiversity loss due to climate change.
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