Study of 95 Bee Species Recasts Climate Risk by Nest Type
Updated
Updated · Nature.com · Jun 15
Study of 95 Bee Species Recasts Climate Risk by Nest Type
3 articles · Updated · Nature.com · Jun 15
Summary
95 wild bee species across Australia showed heat tolerance tracks nest microclimates more closely than regional climate, with stem nesters evolving the highest heat tolerance and ground nesters the lowest.
Nest microclimate temperature explained more variation in heat tolerance than macro-scale climate alone, indicating repeated adaptation rather than a hard evolutionary ceiling on heat tolerance.
Thermal safety rankings flipped when nest conditions were included: ground nesters looked most vulnerable under air-temperature models, but stem and cavity nesters had the narrowest safety margins once hotter nests were counted.
542 bees tracked across Melbourne seasons showed little heat-tolerance plasticity, suggesting short-term acclimation is unlikely to offset rising heat risk.
The findings point conservation efforts toward behavior-based microclimates, with stem-nesting bees facing the most immediate warming threat despite their higher heat tolerance.
Why are the most heat-tolerant tropical bees paradoxically the ones most at risk from rising global temperatures?
Are popular backyard 'bee hotels' inadvertently creating deadly heat traps for the insects they are supposed to protect?
With pollinators of key crops like avocados facing collapse, is our food security more fragile than we realize?
Critical Heat Risk: Up to 95% Mortality Threatens Australian Bees as Climate Change Pushes Species Beyond Thermal Limits
Overview
A new study published on June 15, 2026, reveals that Australian bees face a critical heat risk due to rising temperatures. Surprisingly, bee species with the highest heat tolerance are not necessarily the safest, because many already live in extremely hot environments and are pushed close to their physiological limits. This means that simply having high heat tolerance does not guarantee survival if bees are already at the edge of what they can withstand. The findings highlight an immediate threat to specific native bee species and show the urgent need for a more nuanced understanding of climate vulnerability beyond just heat tolerance.