Heat waves leave bumblebees unable to find flowers by scent
Tóth Z, Juhász B, Kárpáti Z, Schultheiss P, Nooten SS.
Pollinators
Every summer vegetable and fruit in your garden depends on pollinators finding flowers, and heat waves are now scrambling the navigation system bees use to locate them.
Researchers put bumblebees through simulated heat wave conditions, then watched how well they could track down a flower scent. The heat-stressed bees were far less likely to even start searching, and when they did, they wandered randomly instead of heading straight toward the smell. This means that as heat waves become more common, bees may fail at one of the most basic jobs they do: showing up at the right flower at the right time.
Key Findings
Heat wave-treated bumblebees showed significantly lower foraging initiation rates compared to control bees
Heat-stressed bees approached scent sources randomly rather than directionally, losing oriented navigation toward floral odors
Heat wave treatment delayed foraging start time, though total latency to reach the first scent source was similar between groups
chevron_right Technical Summary
Bumblebees exposed to heat wave conditions foraged less, started later, and lost their ability to navigate toward flower scents. This suggests that increasingly frequent heat waves could seriously undermine bumblebee pollination services.
Abstract Preview
Original paper
Heat waves impair foraging initiation and directional movement toward a floral scent in the buff-tailed bumblebee (Bombus terrestris).
Global climate change is disrupting key ecological processes and species interactions. In particular, the frequency and severity of heat waves have increased dramatically over the last decade. Bumb...
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