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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00004567naa a2200409 4500
001oai:researchportal.hkr.se/admin:publications/8303ef0e-10f3-499c-9b15-9e18025ecef9
003SwePub
008240410s2012 | |||||||||||000 ||eng|
0247 a oai:researchportal.hkr.se/admin:publications/8303ef0e-10f3-499c-9b15-9e18025ecef92 URI
0247 a https://doi.org/10.1186/1471-2148-12-452 DOI
040 a (SwePub)hkr
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Kraus, Robertu Wageningen University & Research4 aut
2451 0a Widespread horizontal genomic exchange does not erode species barriers among sympatric ducks
264 1b BioMed Central Ltd.c 2012
338 a electronic2 rdacarrier
520 a BACKGROUND:The study of speciation and maintenance of species barriers is at the core of evolutionary biology. During speciation the genome of one population becomes separated from other populations of the same species, which may lead to genomic incompatibility with time. This separation is complete when no fertile offspring is produced from inter-population matings, which is the basis of the biological species concept. Birds, in particular ducks, are recognised as a challenging and illustrative group of higher vertebrates for speciation studies. There are many sympatric and ecologically similar duck species, among which fertile hybrids occur relatively frequently in nature, yet these species remain distinct.RESULTS:We show that the degree of shared single nucleotide polymorphisms (SNPs) between five species of dabbling ducks (genus Anas) is an order of magnitude higher than that previously reported between any pair of eukaryotic species with comparable evolutionary distances. We demonstrate that hybridisation has led to sustained exchange of genetic material between duck species on an evolutionary time scale without disintegrating species boundaries. Even though behavioural, genetic and ecological factors uphold species boundaries in ducks, we detect opposing forces allowing for viable interspecific hybrids, with long-term evolutionary implications. Based on the superspecies concept we here introduce the novel term "supra-population" to explain the persistence of SNPs identical by descent within the studied ducks despite their history as distinct species dating back millions of years.CONCLUSIONS:By reviewing evidence from speciation theory, palaeogeography and palaeontology we propose a fundamentally new model of speciation to accommodate our genetic findings in dabbling ducks. This model, we argue, may also shed light on longstanding unresolved general speciation and hybridisation patterns in higher organisms, e.g. in other bird groups with unusually high hybridisation rates. Observed parallels to horizontal gene transfer in bacteria facilitate the understanding of why ducks have been such an evolutionarily successful group of animals. There is large evolutionary potential in the ability to exchange genes among species and the resulting dramatic increase of effective population size to counter selective constraints.
7001 a Kerstens, Hindriku Radboud University Nijmegen4 aut
7001 a van Hooft, Pimu Wageningen University & Research4 aut
7001 a Megens, Hendrik-Janu Wageningen University & Research4 aut
7001 a Elmberg, Johanu Kristianstad University4 aut
7001 a Tsvey, Arsenyu Biological Station Rybachy of the Zoological institute, Kaliningrad,Biological Station Rybachy of the Zoological institute, Kaliningrad4 aut
7001 a Sartakov, Dmitryu Ecological Watch of Siberia, Omsk,Ecological Watch of Siberia, Omsk4 aut
7001 a Soloviev, Sergeju Omsk State University4 aut
7001 a Crooijmans, Richardu Wageningen University & Research4 aut
7001 a Groenen, Martienu Wageningen University & Research4 aut
7001 a Ydenberg, Ronaldu Wageningen University & Research4 aut
7001 a Prins, Herbertu Wageningen University & Research4 aut
7102 a Wageningen University & Researchb Radboud University Nijmegen4 org
7730 t BMC Evolutionary Biologyd : BioMed Central Ltd.g 12q 12x 1471-2148
8564 u https://researchportal.hkr.se/ws/files/40916848/FULLTEXT02.pdfx primaryx freey FULLTEXT
8564 u https://bmcevolbiol.biomedcentral.com/track/pdf/10.1186/1471-2148-12-45
8564 8u oai:researchportal.hkr.se/admin:publications/8303ef0e-10f3-499c-9b15-9e18025ecef9
8564 8u https://doi.org/10.1186/1471-2148-12-45

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