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Evolution and stability of the G-matrix during the colonization of a novel environment.

Author:
  • Fabrice Eroukhmanoff
  • Erik Svensson
Publishing year: 2011
Language: English
Pages: 1363-1373
Publication/Series: Journal of Evolutionary Biology
Volume: 24
Issue: 6
Document type: Journal article
Publisher: John Wiley & Sons

Abstract english

Populations that undergo a process of rapid evolution present excellent opportunities to investigate the mechanisms driving or restraining adaptive divergence. The genetic variance-covariance matrix (G) is often considered to constrain adaptation but little is known about its potential to evolve during phenotypic divergence. We compared the G-matrices of ancestral and recently established ecotype populations of an aquatic isopod (Asellus aquaticus) that have diverged in parallel in two south Swedish lakes. Phenotypic changes after colonization involved a reduction in overall size, lost pigmentation and changes in shape. Comparisons between G-matrices reveal close similarity within the same ecotype from different lakes but some degree of differentiation among ecotypes. Phenotypic divergence has apparently not been much influenced by the orientation of G. Additive genetic variation in the newly colonized habitats has also decreased substantially. This suggests that a process of adaptation from standing genetic variation has occurred and has probably facilitated phenotypic divergence.

Keywords

  • Biological Sciences
  • adaptation
  • ecotype
  • G-matrix
  • parallel evolution
  • rapid divergence.

Other

Published
  • BECC
  • ISSN: 1420-9101
erik_svensson
E-mail: erik.svensson [at] biol.lu.se

Professor

Evolutionary ecology

+46 46 222 38 19

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden