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          Institute: MPI für Evolutionsbiologie     Collection: Evolutionary genetics     Display Documents

ID: 400211.0, MPI für Evolutionsbiologie / Evolutionary genetics
Phenotypic plasticity and the evolution of a socially selected trait following colonization of a novel environment
Authors:Price, Trevor D.; Yeh, Pamela J.; Harr, Bettina
Date of Publication (YYYY-MM-DD):2008-07
Title of Journal:The American Naturalist
Volume (in Journal):172
Issue / Number:Suppl. 1
Title of Issue:Genetics of Colonizing Species
Full Name of Issue-Editor(s):Price, Trevor D.
Start Page:S49
End Page:S62
Name of Conference/Meeting:Symposium of the American-Society-of-Naturalists
Place of Conference/Meeting:Christchurch, New Zealand
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:not specified
Audience:Not Specified
Abstract / Description:Novel selection pressures in new environments arise through two distinct processes. First, environmental conditions directly affect the fitness of different phenotypes. Second, phenotypic plasticity alters the distribution of phenotypes, thereby placing populations in new selective regimes. A small isolated population of dark-eyed juncos Junco hyemalis became established in San Diego, probably in the early 1980s and probably from the nearby mountains. The relatively mild coastal climate has resulted in an increase in both the mean and the variance of the length of time females breed each year, and this is assumed to be a result of phenotypic plasticity. The population has evolved reduced white in the tail. We studied contemporary patterns of selection on tail white, in the context of the altered breeding season length. Late-hatched nestlings had higher survival and were in better condition than early-hatched nestlings, but among survivors, late-hatched birds had less tail white. We suggest this reflects juvenile mortality favoring individuals with less tail white. In adults, we found weak sexual selection and no viability selection but positive selection on female tail white in association with fecundity. We argue that altered breeding season length had a major impact on patterns of selection and evolution in this population.
Free Keywords:dark-eyed junco; microsatellites; natural selection; phenotypic plasticity; plumage patterns; sexual selection
External Publication Status:published
Document Type:Conference-Paper
Communicated by:Brigitte Lechner
Affiliations:MPI für Evolutionsbiologie/Abt. Evolutionsgenetik
External Affiliations:Univ Chicago, Dept Ecol & Evolut, Chicago, IL 60637 USA;
Harvard Univ, Sch Med, Dept Syst Biol, Boston, MA 02115 USA;
Univ Cologne, Inst Genet, D-50674 Cologne, Germany
Identifiers:ISSN:0003-0147 (print) [ID-No:1]
ISSN:1537-5323 (online) [ID-No:2]
DOI:10.1086/588257 [ID-No:3]
LOCALID:S 38951 [S-Nummer]
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