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Molecular population divergence and sexual selection on morphology in the banded demoiselle (Calopteryx splendens)

In English

Författare

Summary, in English

The importance of sexual selection in population divergence is of much interest, mainly because it is thought to cause reproductive isolation and hence could lead to speciation. Sexually selected traits have been hypothesized to diverge faster between populations than other traits, presumably because of differences in the strength, mechanism or dynamics of selection. We investigated this by quantifying population divergence in eight morphological characters in 12 south Swedish populations of a sexually dimorphic damselfly, the banded demoiselle (Calopteryx splendens). The morphological characters included a secondary sexual character, the male melanized wing spot, which has an important function in both inter- and intrasexual selection. In addition, we investigated molecular population divergence, revealed by amplified fragment length polymorphism (AFLP) analysis. Molecular population divergence was highly significant among these Northern European populations ( overall Fst = 0.054; pairwise population Fst's ranged from apprx0 to 0.13). We found evidence for isolation-by-distance (r = 0.70) for the molecular markers and a significant correlation between molecular and phenotypic population divergence (r = 0.39). One interpretation is that population divergence for the AFLP loci are affected by genetic drift, but is also indirectly influenced by selection, due to linkage with loci for the phenotypic traits. Field estimates of sexual and natural selection from two of the populations revealed fairly strong sexual selection on wing spot length, indicating that this trait has the potential to rapidly diverge, provided that variation is heritable and the observed selection is chronic.

Publiceringsår

2004

Språk

Engelska

Sidor

423-433

Publikation/Tidskrift/Serie

Heredity

Volym

93

Issue

5

Dokumenttyp

Artikel i tidskrift

Förlag

Macmillan

Ämne

  • Biological Sciences

Status

Published

Forskningsgrupp

  • Molecular Ecology and Evolution Lab
  • Evolution and Ecology of Phenotypes in Nature

ISBN/ISSN/Övrigt

  • ISSN: 1365-2540