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On the evolutionary stability of partial migration.

In English

Författare

Summary, in English

The evolution of partial migration in birds is typically assumed to be the result of an optimization process. The fitness rewards for individuals choosing to migrate are balanced against the rewards of remaining in the breeding area all year around. This balancing is often thought to result in an evolutionarily stable strategy (ESS) such that an optimal fraction of the population becomes migratory through adaptive evolution. Here I show that this solution can indeed be reached through adaptive evolution, but that the equilibrium is a neutral or "weak" ESS. The equilibrium fraction of migrants is more reminiscent of the Fisherian sex ratio. I also show that this individual-based evolutionary solution may deviate significantly from the optimal solution for the population (maximum population size), quite in line with previous findings. Finally, I show that partial migration is very unlikely without density- or frequency-dependent selection.

Publiceringsår

2013

Språk

Engelska

Sidor

36-39

Publikation/Tidskrift/Serie

Journal of Theoretical Biology

Volym

321

Dokumenttyp

Artikel i tidskrift

Förlag

Academic Press

Ämne

  • Biological Sciences

Nyckelord

  • Partial migration
  • Evolution
  • Frequency-dependence
  • Density-dependence
  • ESS

Status

Published

Forskningsgrupp

  • Theoretical Population Ecology and Evolution Group

ISBN/ISSN/Övrigt

  • ISSN: 1095-8541