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Evolving dispersal ability causes rapid adaptive radiation.

Takeshi Yamasaki1, Yutaka Kobayashi2

  • 1Yamashina Institute for Ornithology, 115 Konoyama, Abiko, Chiba, 270-1145, Japan. yamasaki@yamashina.or.jp.

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Summary
This summary is machine-generated.

Rapid adaptive radiation, the rapid evolution of new species, is explained by the evolvability of dispersal ability. Simulations show that reduced dispersal in island populations drives this evolutionary process.

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Area of Science:

  • Evolutionary Biology
  • Ecological Speciation

Background:

  • The mechanisms driving rapid adaptive radiation remain poorly understood, with existing theories requiring specific assumptions.
  • Darwin's research highlighted adaptive radiation, but comprehensive explanations for diverse taxa are lacking.

Purpose of the Study:

  • To propose a simple, empirically supported theoretical solution to explain rapid adaptive radiation.
  • To investigate the role of evolvable dispersal ability in adaptive radiation using simulations.

Main Methods:

  • Extended the classical archipelago model by incorporating the evolvability of dispersal ability.
  • Conducted individual-based simulations to model evolutionary dynamics in island populations.

Main Results:

  • Environmental heterogeneity initially decreased dispersal ability.
  • Evenly distributed islands in simulations led to a halt in dispersal reduction due to immigration.
  • Synchronous reduction in dispersal across populations, triggered by a final island's sustained high dispersal, resulted in rapid speciation.

Conclusions:

  • The evolvability of dispersal ability provides a unifying mechanism for rapid adaptive radiation.
  • The properties of ordinary archipelagos, particularly immigration patterns, are key drivers of simultaneous speciation events.