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Resource specialization, like hole-nesting in birds, does not lead to evolutionary dead ends. Hole-nesting passerines show no reduced diversification rates, and transitions out of hole-nesting are common.

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Area of Science:

  • Evolutionary Biology
  • Zoology

Background:

  • The evolutionary dead end hypothesis posits that resource specialization limits diversification and adaptability.
  • Recent advances in comparative methods allow for more robust testing of this hypothesis.

Purpose of the Study:

  • To test the evolutionary dead end hypothesis in passerine birds.
  • To investigate if hole-nesting specialization affects net diversification rates.
  • To determine the frequency of transitions into and out of hole-nesting.

Main Methods:

  • Analysis of diversification rates across 3224 passerine species.
  • Estimation of net diversification rate differences associated with nest-type specialization.
  • Application of diversification models accounting for rate heterogeneity and extinction scenarios.

Main Results:

  • Hole-nesting specialization was not associated with significant differences in net diversification rates.
  • Transitions out of hole-nesting were found to be more frequent than transitions into hole-nesting.
  • Interspecific competition may influence hole-nesting adoption but not diversification.

Conclusions:

  • Resource specialization, specifically hole-nesting in passerines, does not typically lead to evolutionary dead ends.
  • Specialists can transition back to more generalist strategies, challenging the evolutionary dead end hypothesis.
  • Findings contribute to a growing body of evidence against specialization as a common evolutionary bottleneck.