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Brain size predicts bees' tolerance to urban environments.

Jose B Lanuza1,2, Miguel Á Collado1,3, Ferran Sayol4

  • 1Estación Biológica de Doñana (EBD-CSIC), 41092 Seville, Spain.

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Bee species in urban habitats have larger brains, suggesting enhanced cognitive abilities help them adapt to human-altered environments. This supports the cognitive buffer hypothesis in invertebrates.

Keywords:
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Area of Science:

  • Ecology
  • Neuroscience
  • Zoology

Background:

  • Habitat conversion poses a threat to insect pollinators globally.
  • Some pollinator species, however, thrive in anthropogenic landscapes, but the reasons are unclear.
  • The cognitive buffer hypothesis, tested in vertebrates, proposes larger brains enhance adaptability.

Purpose of the Study:

  • To test the cognitive buffer hypothesis in insects, specifically bee species.
  • To investigate the relationship between bee brain size and habitat occupancy in anthropogenic environments.

Main Methods:

  • Measured relative brain size in 89 bee species.
  • Assessed the degree of habitat occupancy for each species.
  • Compared brain size and habitat preference (urban vs. forested/agricultural).

Main Results:

  • Bee species prevalent in urban habitats exhibited larger relative brain sizes compared to those in natural habitats.
  • Urban bees also had larger body sizes, resulting in larger absolute brain sizes.
  • This indicates a correlation between larger brain size and adaptation to urban environments.

Conclusions:

  • Provides the first empirical support for the cognitive buffer hypothesis in invertebrates.
  • Suggests that larger brain size in bees confers behavioral advantages for tolerating urban environments.
  • Highlights the potential for cognitive adaptations in insect responses to habitat change.