Abstract:
: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.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Frentiu FD,Clegg SM,Blows MW,Owens IPdoi
10.1111/j.1420-9101.2006.01242.xsubject
Has Abstractpub_date
2007-03-01 00:00:00pages
639-49issue
2eissn
1010-061Xissn
1420-9101pii
JEB1242journal_volume
20pub_type
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