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No evidence for assortative mating within a willow warbler migratory divide
Center for Animal Movement Research (CAnMove), Department of Biology, Lund University, 22362 Lund, Sweden.ORCID iD: 0000-0001-7089-524X
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2014 (English)In: Frontiers in Zoology, ISSN 1742-9994, E-ISSN 1742-9994, Vol. 11, 52Article in journal (Refereed) Published
Abstract [en]

In contact zones, genetic mixing of two taxa can be restricted by prezygotic (e.g. assortative mating) or postzygotic (lower fitness of hybrid offspring) barriers, or a combination of the two. A hybrid zone between two willow warbler subspecies (Phylloscopus trochilus trochilus, P. t. acredula) with distinctive migratory strategies occurs in central Sweden. These subspecies exhibit differences in migratory direction and distance, resulting in geographically distinct wintering areas in Africa. The subspecies may have diverged from a common refuge after the last ice age, and neutral genetic markers are homogeneous across their range. By contrast, several phenotypic traits and genetic markers of two chromosomal regions previously identified show steep clines across the divide. The evolutionary forces that maintain this migratory divide remain unknown. Here we use plumage colour, morphology, genetic markers and feather stable nitrogen-isotopes (δ 15N) to assess if assortative mating between migratory phenotypes could be acting as a possible mechanism for keeping the two forms genetically separate and maintaining the migratory divide. We colour-ringed a willow warbler breeding population in the central part of the hybrid zone and observed the breeding population to assess phenotypic and genotypic traits of social pairs.

Place, publisher, year, edition, pages
2014. Vol. 11, 52
Keyword [en]
hybrid zone, Nitrogen-15, Phylloscopus trochilus, Postzygotic selection, Prezygotic selection, reproductive isolation, Willow warbler
National Category
Ecology Evolutionary Biology
Identifiers
URN: urn:nbn:se:umu:diva-130380DOI: 10.1186/s12983-014-0052-2ISI: 000339204800001Scopus ID: 2-s2.0-84942085765OAI: oai:DiVA.org:umu-130380DiVA: diva2:1066514
Available from: 2017-01-18 Created: 2017-01-18 Last updated: 2017-02-02Bibliographically approved

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Larson, Keith W.
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf