Large body size in an island-dwelling bird : a microevolutionary analysis
Frentiu, F.D., Clegg, S.M., Blows, M.W., & Owens, I.P. (2007) Large body size in an island-dwelling bird : a microevolutionary analysis. Journal Of Evolutionary Biology, 20(2), pp. 639-649.
Island races of passerine birds display repeated evolution towards larger body size compared with their continental ancestors. The Capricorn silvereye (Zosterops lateralis chlorocephalus) has become up to six phenotypic standard deviations bigger in several morphological measures since colonization of an island approximately 4000 years ago. We estimated the genetic variance-covariance (G) matrix using full-sib and 'animal model' analyses, and selection gradients, for six morphological traits under field conditions in three consecutive cohorts of nestlings. Significant levels of genetic variance were found for all traits. Significant directional selection was detected for wing and tail lengths in one year and quadratic selection on culmen depth in another year. Although selection gradients on many traits were negative, the predicted evolutionary response to selection of these traits for all cohorts was uniformly positive. These results indicate that the G matrix and predicted evolutionary responses are consistent with those of a population evolving in the manner observed in the island passerine trend, that is, towards larger body size.
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|Item Type:||Journal Article|
|Keywords:||silvereyes, island biology, adaptation, evolutionary genetics|
|Subjects:||Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
|Deposited On:||12 Oct 2012 11:40|
|Last Modified:||15 Oct 2012 11:47|
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