Researchers work to understand how heat affects wild bees

(21 Jul 2025)
RESTRICTION SUMMARY:

ASSOCIATED PRESS
Bowling Green, Ohio – 17 June 2025
1. Closeup of bumble bee flying onto flowers
2. Wide of Kevin McCluney looking for bees to sample
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3. SOUNDBITE (English) Kevin McCluney, biologist, Bowling Green State University:
"One of the things that we’re really interested in is the threats to urban bees. And there’s many things that the urban environment changes but one of them is temperature. It’s one of the most interesting things we found, is that the vast majority of the species that we are looking at, as their body temperature heats up, they become dehydrated. As they got hotter they became close to their dehydration limits way before they reach their overheating limits.”
4. Detail of Kevin McCluney trying to capture bee
5. Closeup of bumblebee inside plastic tube
6. Various of Kevin McCluney taking a temperature reading of bumblebee
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7. SOUNDBITE (English) Kevin McCluney, biologist, Bowling Green State University:
"When the environment gets stressful, those bees go back tor their nests, they go to an underside of a leaf and hang out trying to cool off. And then when they do that, they’re not pollinating those flowers. If you lose pollinators, not only are food sources being affected, but just the diversity of plants is going to be affected by that lack of pollination."
8. Various of honey bee foraging on flowers
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9. SOUNDBITE (English) Kevin McCluney, biologist, Bowling Green State University:
"The bee diversity does decline when it becomes more urban, when you have more pavement, but if you plant more flowers, it erases that decline. That could be the biggest solution.”
10. Medium of honey bee foraging on flowers as truck drives by
STORYLINE:
As global temperature rise, scientists are trying to understand how heat affects bees.

It’s an important question because the bees are critical to the fruit, vegetables, nuts and other foods that humans need. Generally, most bees are heat-tolerant, but as the climate warms, some experts think their ability to fend off disease and gather food might become harder. And habitat loss, increased use of pesticides, diseases and lack of forage for both managed and wild bees are all listed as potential contributors to the global decline of bees and other pollinators.

Scientists have found that bees fly differently during extreme heat and may also cope the same way humans do — by finding a cooler environment. But they aren’t able to do as much as they normally do, and scientists worry that heat makes the bees more vulnerable to disease.

Kevin McCluney, a biology professor at Bowling Green State University in Ohio, has studied how heat affects bees, and his team found that bees tend to dehydrate before they overheat. And when bees are stressed, they search for shade or water instead of pollinating crops or other plants, and could also affect their ability to reproduce.

Data is limited on how much climate change and heat stress is contributing to pollinator decline. The Trump administration’s proposed budget would eliminate the research program that funds the USGS Bee Lab, which supports the inventory, monitoring and natural history of the nation’s wild bees. Other grants for bee research are also in jeopardy. 

(AP Video by Joshua A. Bickel)

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