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Experimental elevated temperature affects bumblebee foraging and flight speed.

Maxence Gérard1,2, Erika Gardelin1, Philipp Lehmann1,3

  • 1Department of Zoology, INSECT Lab, Division of Functional Morphology, Stockholm University, Svante Arrhenius väg 18b, 11418 Stockholm, Sweden.

Proceedings. Biological Sciences
|October 29, 2024
PubMed
Summary
This summary is machine-generated.

Global warming impacts bumblebee foraging. Elevated temperatures increase bumblebee flight speed but decrease foraging time, potentially disrupting vital plant-pollinator interactions.

Keywords:
Bombus terrestrisclimate changeflightglobal warminginsectpollination

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Area of Science:

  • Ecology
  • Animal Behavior
  • Climate Change Biology

Background:

  • Global warming poses a significant threat to wild bee populations and their crucial role in plant pollination.
  • Previous research indicates negative impacts of rising temperatures on bee-plant interactions, but effects on bee foraging behavior remain less understood.

Purpose of the Study:

  • To investigate the influence of ambient temperature on the foraging behaviors of the bumblebee (Bombus terrestris).
  • To identify potential underlying physiological mechanisms, such as flight metabolic rate, affected by temperature changes.

Main Methods:

  • Bumblebees (Bombus terrestris) foraged on artificial flowers in controlled environments at 24°C and 32°C.
  • Key behaviors recorded included flower visitation rate, flight speed, foraging time, and number of foraging trips.
  • Flight metabolic rate was measured across a temperature range to assess physiological responses.

Main Results:

  • At 32°C, bumblebees exhibited decreased flower visitation time but increased flower visitation rate and flight speed compared to 24°C.
  • A reduced flight metabolic rate was observed at higher temperatures, correlating with increased flight speed.
  • The number of foraging trips per worker decreased at 32°C, suggesting potential heat stress despite lower energetic costs.

Conclusions:

  • Elevated temperatures significantly alter bumblebee foraging behavior, including changes in speed and duration.
  • Observed behavioral shifts and potential stress at higher temperatures indicate a risk of disrupted plant-pollinator interactions.
  • Findings highlight the vulnerability of bumblebees to climate change and its implications for ecosystem function.