Signals of demographic expansion in Drosophila virilis

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dc.contributor.author Mirol, Patricia M
dc.contributor.author Routtu, Jarkko
dc.contributor.author Hoikkala, Anneli
dc.contributor.author Butlin, Roger K
dc.date.accessioned 2012-11-20T12:16:44Z
dc.date.available 2012-11-20T12:16:44Z
dc.date.issued 2008 fi
dc.identifier.citation Mirol, P., Routtu, J., Hoikkala, A., & Butlin, R. (2008). Signals of demographic expansion in Drosophila virilis. BMC Evolutionary Biology, 8, 59-66. Retrieved from http://www.biomedcentral.com/content/pdf/1471-2148-8-59.pdf fi
dc.identifier.issn 1471-2148
dc.identifier.uri http://dx.doi.org/10.1186/1471-2148-8-59
dc.identifier.uri http://hdl.handle.net/123456789/40384
dc.description.abstract Background. The pattern of genetic variation within and among populations of a species is strongly affected by its phylogeographic history. Analyses based on putatively neutral markers provide data from which past events, such as population expansions and colonizations, can be inferred. Drosophila virilis is a cosmopolitan species belonging to the virilis group, where divergence times between different phylads go back to the early Miocene. We analysed mitochondrial DNA sequence variation among 35 Drosophila virilis strains covering the species' range in order to detect demographic events that could be used to understand the present characteristics of the species, as well as its differences from other members of the group. Results. Drosophila virilis showed very low nucleotide diversity with haplotypes distributed in a star-like network, consistent with a recent world-wide exponential expansion possibly associated either with domestication or post-glacial colonization. All analyses point towards a rapid population expansion. Coalescence models support this interpretation. The central haplotype in the network, which could be interpreted as ancestral, is widely distributed and gives no information about the geographical origin of the population expansion. The species showed no geographic structure in the distribution of mitochondrial haplotypes, in contrast to results of a recent microsatellite-based analysis. Conclusion. The lack of geographic structure and the star-like topology depicted by the D. virilis haplotypes indicate a pattern of global demographic expansion, probably related to human movements, although this interpretation cannot be distinguished from a selective sweep in the mitochondrial DNA until nuclear sequence data become available. The particular behavioural traits of this species, including weak species-discrimination and intraspecific mate choice exercised by the females, can be understood from this perspective. fi
dc.language.iso eng
dc.publisher BioMed Central (BMC)
dc.relation.ispartofseries BMC Evolutionary Biology
dc.rights © 2008 Mirol et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.rights.uri http://creativecommons.org/licenses/by/2.0
dc.subject.other mtDNA
dc.subject.other populaatiorakenne
dc.subject.other population structure
dc.title Signals of demographic expansion in Drosophila virilis fi
dc.type Article en
dc.contributor.laitos Bio- ja ympäristötieteiden laitos fi
dc.contributor.laitos The Department of Biological and Environmental Sciences en
dc.type.uri http://purl.org/eprint/type/JournalArticle
dc.identifier.doi 10.1186/1471-2148-8-59
dc.date.updated 2012-11-15T14:54:29Z
dc.description.version Published version
eprint.status http://purl.org/eprint/type/status/PeerReviewed
dc.rights.holder Patricia M Mirol et al.; licensee BioMed Central Ltd.

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