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dc.contributor.authorShepherd, LD
dc.contributor.authorMillar, CD
dc.contributor.authorBallard, G
dc.contributor.authorAinley, DG
dc.contributor.authorWilson, PR
dc.contributor.authorHaynes, GD
dc.contributor.authorBaroni, C
dc.contributor.authorLambert, DM
dc.date.accessioned2017-05-03T14:39:00Z
dc.date.available2017-05-03T14:39:00Z
dc.date.issued2005
dc.identifier.issn0027-8424
dc.identifier.doi10.1073/pnas.0502281102
dc.identifier.urihttp://hdl.handle.net/10072/27560
dc.description.abstractMicroevolution is regarded as changes in the frequencies of genes in populations over time. Ancient DNA technology now provides an opportunity to demonstrate evolution over a geological time frame and to possibly identify the causal factors in any such evolutionary event. Using nine nuclear microsatellite DNA loci, we genotyped an ancient population of Adelie penguins (Pygoscelis adeliae) aged approximate to 6,000 years B.P. Subfossil bones from this population were excavated by using an accurate stratigraphic method that allowed the identification of individuals even within the same layer. We compared the allele frequencies in the ancient population with those recorded from the modern population at the same site in Antarctica. We report significant changes in the frequencies of alleles between these two time points, hence demonstrating microevolutionary change. This study demonstrates a nuclear gene-frequency change over such a geological time frame. We discuss the possible causes of such a change, including the role of mutation, genetic drift, and the effects of gene mixing among different penguin populations. The latter is likely to be precipitated by mega-icebergs that act to promote migration among penguin colonies that typically show strong natal return.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherNational Academy of Sciences
dc.publisher.placeWashington, D.C., USA
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom16717
dc.relation.ispartofpageto16722
dc.relation.ispartofissue46
dc.relation.ispartofjournalProceedings of the National Academy of Sciences
dc.relation.ispartofvolume102
dc.rights.retentionY
dc.subject.fieldofresearchMolecular evolution
dc.subject.fieldofresearchcode310510
dc.titleMicroevolution and mega-icebergs in the Antarctic
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.date.issued2015-05-13T03:20:43Z
gro.hasfulltextNo Full Text
gro.griffith.authorLambert, David M.


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