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Population divergence of genetic (co)variance matrices in a subdivided plant species, Brassica cretica

Author:
  • Björn Widén
  • Stefan Andersson
  • G Y Rao
  • Marie Widén
Publishing year: 2002
Language: English
Pages: 961-970
Publication/Series: Journal of evolutionary biology
Volume: 15
Issue: 6
Document type: Journal article
Publisher: John Wiley & Sons

Abstract english

The present study of Brassica cretica had two objectives. First, we compared estimates of population structure (Q(st)) for seven phenotypic characters with the corresponding measures for allozyme markers (F-st) to evaluate the supposition that genetic drift is a major determinant of the evolutionary history of this species. Secondly, we compared the genetic (co) variance (G) matrices of five populations to examine whether a long history of population isolation is associated with large, consistent differences in the genetic (co) variance structure. Differences between estimates of Fst and Qst were too small to be declared significant, indicating that stochastic processes have played a major role in the structuring of quantitative variation in this species. Comparison of populations using the common principal component (CPC) method rejected the hypothesis that the G matrices differed by a simple constant of proportionality: most of the variation involved principal component structure rather than the eigenvalues. However, there was strong evidence for proportionality in comparisons using the method of percentage reduction in mean-square error (MSE), at least when characters with unusually high (co) variance estimates were included in the analyses. Although the CPC and MSE methods provide different, but complementary, views of G matrix variation, we urge caution in the use of proportionality as an indicator of whether genetic drift is responsible for divergence in the G matrix.

Keywords

  • Ecology

Other

Published
  • ISSN: 1420-9101
Stefan Andersson
E-mail: stefan [dot] andersson [at] biol [dot] lu [dot] se

Professor

Biodiversity

+46 46 222 44 08

E-A322

50

Research group

Plant Biology

Projects

 

Doctoral students and Postdocs

PhD students, main supervisor

Gróa Valgerdur Ingimudardóttir

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