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Adaptive branching in source-sink habitats

Publiceringsår: 2010
Språk: Engelska
Sidor: 479-489
Publikation/Tidskrift/Serie: Evolutionary Ecology
Volym: 24
Nummer: 2
Dokumenttyp: Artikel
Förlag: Springer

Sammanfattning

Evolution and ecological diversification in a heterogeneous environment is driven by an often complex interplay between local adaptation and dispersal between different habitat types. Heterogeneous environments also easily generate source-sink dynamics of populations coupled by dispersal. It follows that local adaptation and possible adaptive radiation almost by necessity involves adaptation to a (pseudo-)sink habitat, which is considered unlikely. We here study a model of 'parapatric branching' with this special focus on the spatial ecology of the process. We find that evolutionary branching can display a sequence of alternating adaptations to the source or the sink. In some circumstances a true sink can become a pseudo-sink through adaptation to the corresponding source habitat. The evolutionary endpoint is a spatially structured community consisting of two source populations with one corresponding sink or pseudo-sink each. Our results shed new light on the interpretation of extant source-sink systems and the process of parapatric branching.

Disputation

Nyckelord

  • Earth and Environmental Sciences
  • Parapatric branching
  • Source-sink dynamics
  • Local adaptation
  • Dispersal
  • Migration

Övriga

Published
Yes
  • ISSN: 0269-7653

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