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Optimal body size in bumblebees.

Graham H Pyke1

  • 1Department of Biology, University of Utah, 84112, Salt Lake City, UT, USA.

Oecologia
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Bumblebee body size is optimized to maximize energy intake during nectar collection. This study found that observed bumblebee sizes closely match the predicted optimal size, balancing flight speed and energy costs.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Biomechanics

Background:

  • Bumblebee foraging efficiency is influenced by body size.
  • Larger bumblebees have advantages (faster flight) and disadvantages (higher energy costs).

Purpose of the Study:

  • To develop a mathematical model predicting optimal bumblebee body size for nectar collection.
  • To test if observed bumblebee body size aligns with the model's predictions.
  • To explore the relationship between bumblebee size and nectar obtained per flower.

Main Methods:

  • Developed a mathematical model of net energy intake as a function of bumblebee body size.
  • Estimated model parameters using foraging data from bumblebees on monkshood.
  • Calculated optimal body size for Bombus appositus workers.

Main Results:

  • The model identified an optimal body size balancing flight speed and energy expenditure.
  • Observed body sizes of Bombus appositus were not significantly different from the predicted optimal size.
  • A positive correlation was found between bumblebee size and nectar obtained per flower.

Conclusions:

  • Bumblebee body size appears to be adapted to maximize net energy intake during foraging.
  • The findings support the hypothesis that natural selection favors body sizes that optimize foraging efficiency.
  • The study suggests implications for plant-pollinator interactions and predator-prey dynamics.