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Bee flowers drive macroevolutionary diversification in long-horned bees.

Achik Dorchin1, Anat Shafir2, Frank H Neumann3

  • 1The National Natural History Collections, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel.

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Summary

Floral host specialization significantly boosted diversification in eucerine bees. Exploiting plants with restricted pollen opened new niches, driving global colonization and rapid speciation in this bee group.

Keywords:
bee diversificationfloral host shiftfloral rewardplant–insect interactionspollen specializationzygomorphic flowers

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Area of Science:

  • Evolutionary biology
  • Ecology
  • Entomology

Background:

  • Plant-pollinator interactions are key to angiosperm radiation.
  • Pollinator-driven diversification is known in plants, but not floral visitors like bees.
  • The impact of floral host association on bee diversification remains largely unstudied.

Purpose of the Study:

  • To investigate how floral host preference influenced diversification in eucerine bees (Apidae, Eucerini).
  • To provide empirical evidence for the role of floral associations in bee diversification.

Main Methods:

  • Quantitative pollen analyses were combined with a phylogenetic hypothesis.
  • A state speciation and extinction probabilistic approach was employed.

Main Results:

  • The study provides the first evidence that transitions to specialized 'bee-flowers' significantly increased eucerine bee diversification.
  • Evolutionary shifts from accessible to restricted pollen resources were linked to increased speciation rates.

Conclusions:

  • Exploiting host plants with restricted pollen created new ecological niches for eucerine bees.
  • This specialization facilitated their global colonization and rapid diversification.