Rising temperatures are cooking bumblebee nests and killing larvae

Researchers from the University of Guelph in Canada reviewed studies dating back to the 1800s and found that, regardless of species or region,prefer a nest temperature between around 28 and 32°C . When nest temperatures surpassed 36°C , the bees couldn’t continue reproducing, adding new evidence to the idea that increased heat could be partly to blame.

It is still crucial to consider other bumblebee threats, like pesticides and habitat loss. Efforts like planting native wildflower gardens can create much-needed habitat, but without also addressing warming, says Kevan, bumblebees may face a harrowing future.

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