Can alloethism in workers of the bumblebee, Bombus terrestris, be explained in terms of foraging efficiency?

@article{Goulson2002CanAI,
  title={Can alloethism in workers of the bumblebee, Bombus terrestris, be explained in terms of foraging efficiency?},
  author={Dave Goulson and James Peat and J C Stout and James Tucker and William O. H. Hughes},
  journal={Animal Behaviour},
  year={2002},
  volume={64},
  pages={123-130}
}
Bumblebee workers vary greatly in size, unlike workers of most other social bees. [] Key Method We quantified the size of workers engaging in foraging compared to those that remain in the nest, and confirmed that it is the larger bees that tend to forage (X ± SE thorax widths 4.34 ± 0.01 mm for nest bees and 4.93 ± 0.02 mm for foragers). We then investigated whether large bees are better suited to foraging because they are able to transport heavier loads of food back to the nest.

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