The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

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

Author

Summary, in 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.

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 Inc.

Topic

  • Biological Sciences

Keywords

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

Status

Published

Research group

  • Evolution and Ecology of Phenotypes in Nature

ISBN/ISSN/Other

  • ISSN: 1420-9101