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Adaptive branching in source-sink habitats

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Author

  • Jennie Holmér
  • Jörgen Ripa

Summary, in English

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.

Publishing year

2010

Language

English

Pages

479-489

Publication/Series

Evolutionary Ecology

Volume

24

Issue

2

Document type

Journal article

Publisher

Springer

Topic

  • Biological Sciences

Keywords

  • Parapatric branching
  • Source-sink dynamics
  • Local adaptation
  • Dispersal
  • Migration

Status

Published

Research group

  • Theoretical Population Ecology and Evolution Group

ISBN/ISSN/Other

  • ISSN: 1573-8477