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By Jennie L. Durant
University of California, Davis
THE CONVERSATION
The extreme weather that has battered much of the U.S. in 2022 doesn't just affect humans. Heat waves, wildfires, droughts and storms also threaten many wild species -- including some that already face other stresses.
I've been researching bee health for over 10 years, with a focus on honey bees. In 2021, I began hearing for the first time from beekeepers about how extreme drought and rainfall were affecting bee colony health.
Drought conditions in the western U.S. in 2021 dried up bee forage -- the floral nectar and pollen that bees need to produce honey and stay healthy. And extreme rain in the Northeast limited the hours that bees could fly for forage.
In both cases, managed colonies - hives that humans keep for honey production or commercial pollination - were starving. Beekeepers had to feed their bees more supplements of sugar water and pollen than they usually would to keep their colonies alive. Some beekeepers who had been in business for decades shared that they lost 50% to 70% of their colonies over the winter of 2021-2022.
These weather conditions likely also affected wild and native bees. And unlike managed colonies, these important species did not receive supplements to buffer them through harsh conditions. Each year, the U.S. Department of Agriculture and the Environmental Protection Agency host federal pollinator experts to share the latest scientific findings on bee and pollinator health, and assess the status of these important insects, birds, bats and other species. One clear takeaway from this year's meeting was that climate change has become a new and formidable stressor for bees, potentially amplifying previously known issues in ways that scientists can't yet predict but need to prepare for.
Pollinators contribute an estimated US$235 billion to $577 billion yearly to global agriculture, based on the value of the crops they pollinate. Understanding and mitigating the impacts of climate change on pollinators is key for supporting healthy ecosystems and sustainable agriculture. Bee health first attracted widespread attention in 2006 with the emergence of Colony Collapse Disorder, a phenomenon where the majority of adult worker bees in a colony disappeared, leaving their honey and pollen stores and some nurse bees behind to care for the queen and remaining immature bees. In the past five years, reported cases have declined substantially. Now, researchers are focusing on what beekeepers call the "four Ps": parasites, pathogens, pesticides and poor nutrition, as well as habitat loss for wild and native bees.