Cambridge study finds bumblebees collect up to seven times more heavy metals than honeybees

Bumblebees have been found to accumulate up to seven times more toxic heavy metals than honeybees, even when both species forage in identical environments, a new study from the University of Cambridge reports. The research, which measured metal concentrations in the bodies of foraging insects, highlights a significant disparity in how the two pollinators process environmental contaminants.

The metals detected—chiefly lead, cadmium, and zinc—can impair a range of vital functions in bumblebees, from foraging efficiency to reproductive success. By disrupting foraging behavior, the insects may reduce pollen collection and nectar transport, while reproductive interference could lead to population declines. The study’s authors suggest that the higher metal loads in bumblebees may stem from differences in foraging strategies, nesting habits, or physiological detoxification mechanisms.

These findings raise concerns about the broader ecological impact of heavy metal pollution on pollinator communities. If bumblebees are more susceptible to contamination, their role as key pollinators for many wild and agricultural plants could be compromised, potentially affecting crop yields and biodiversity. Further research will be needed to determine the long‑term consequences and to develop strategies to mitigate metal exposure for these essential insects.