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Genetics and the Origin of Two Flycatcher Species
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Evolutionary Biology.
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, different genetic tools are used to investigate pre- and postzygotic barriers to gene exchange and their role in speciation in the pied flycatcher (Ficedula hypoleuca) and the collared flycatcher (F. albicollis). This species complex consists of four genetically distinct clades that apparently diverged in allopatry (I). Sequencing of introns from autosomal and Z-linked genes from the two species reveals signs of selection on the Z-chromosome. Sexual selection acting on Z-linked genes might explain this pattern (II). By using large-scale genotyping of single nucleotide polymorphisms (SNPs), introgression is observed at autosomal- but not Z-linked loci, mostly from the pied- to the collared flycatcher. Male plumage characters and genes involved in hybrid fitness are largely mapped to the Z-chromosome (III). By studying mate choice of female hybrids I show that there is a link between female preferences and the Z chromosome (IV). The rate of introgression in island versus clinal hybrid zones is consistent with regional differences in hybrid fertility. Asymmetric gene flow from allopatry on the islands may oppose reinforcement, leading to introgression and a partial breakdown of postzygotic isolation. Adaptive introgression may explain the high rate of introgression observed at one of the genetic markers (V). For late breeding female collared flycatchers it appears to be adaptive to use pied flycatchers as social fathers but conspecific males as genetic fathers. Additionally, females in mixed species pairs may reduce hybridization costs by producing an excess of male hybrid offspring that are more fertile than females (VI).

In conclusion, the Z-chromosome appears to play a major role in flycatcher speciation. Sexual selection and reinforcement are important mechanisms in the divergence of these birds. However, gene flow from allopatry, introgression of adaptive genes and adaptive hetrospecific pairing by late breeding collared flycatcher females may work in the opposite direction.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2004. , p. 56
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 925
Keyword [en]
Biology, reinforcement, reproductive isolation, Z chromosome, hybridization, mate-choice, single nucleotide polymorphism, sequence variation, sexual selection, recombination
Keyword [sv]
Biologi
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-3919ISBN: 91-554-5846-7 (print)OAI: oai:DiVA.org:uu-3919DiVA, id: diva2:163915
Public defence
2004-01-30, Zootissalen, EBC, Villavägen 9, Uppsala, 13:00
Opponent
Supervisors
Available from: 2004-01-07 Created: 2004-01-07 Last updated: 2011-03-04Bibliographically approved
List of papers
1. Speciation, introgressive hybridization and nonlinear rate of molecular evolution in flycatchers
Open this publication in new window or tab >>Speciation, introgressive hybridization and nonlinear rate of molecular evolution in flycatchers
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2001 In: Molecular Ecology, Vol. 10, p. 737-749Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91245 (URN)
Available from: 2004-01-07 Created: 2004-01-07Bibliographically approved
2. Recurrent selective sweeps on the Z chromosome characterize the evolutionary history of two closely related flycatcher species (Ficedula hypoleuca and F. albicollis)
Open this publication in new window or tab >>Recurrent selective sweeps on the Z chromosome characterize the evolutionary history of two closely related flycatcher species (Ficedula hypoleuca and F. albicollis)
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-91246 (URN)
Available from: 2004-01-07 Created: 2004-01-07 Last updated: 2010-01-13Bibliographically approved
3. Sex chromosome evolution and speciation in Ficedula flycatchers
Open this publication in new window or tab >>Sex chromosome evolution and speciation in Ficedula flycatchers
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2003 In: Proceedings of the Royal Society of London: Biological Sciences, Vol. 270, p. 53-59Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91247 (URN)
Available from: 2004-01-07 Created: 2004-01-07 Last updated: 2012-02-29
4. Paternally determined species recognition in female flycathcer hybrids
Open this publication in new window or tab >>Paternally determined species recognition in female flycathcer hybrids
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Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-91248 (URN)
Available from: 2004-01-07 Created: 2004-01-07 Last updated: 2010-01-13Bibliographically approved
5. Rate of introgression in island versus clinal hybrid zones of Ficedula flycatchers are consistent with regional differences in hybrid fertility
Open this publication in new window or tab >>Rate of introgression in island versus clinal hybrid zones of Ficedula flycatchers are consistent with regional differences in hybrid fertility
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Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-91249 (URN)
Available from: 2004-01-07 Created: 2004-01-07 Last updated: 2012-02-29
6. Hybridization and adaptive mate choice in flycatchers
Open this publication in new window or tab >>Hybridization and adaptive mate choice in flycatchers
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2001 In: Nature, Vol. 411, p. 45-50Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91250 (URN)
Available from: 2004-01-07 Created: 2004-01-07Bibliographically approved

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