No evidence for assortative mating within a willow warbler migratory divide. Liedvogel, M., Larson, K. W., Lundberg, M., Gursoy, A., Wassenaar, L. I., Hobson, K. A., Bensch, S., & Åkesson, S. Frontiers in Zoology, 11(1):52, July, 2014. 00005![No evidence for assortative mating within a willow warbler migratory divide [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 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.
@article{liedvogel_no_2014,
title = {No evidence for assortative mating within a willow warbler migratory divide},
volume = {11},
copyright = {2014 Liedvogel et al.},
issn = {1742-9994},
url = {http://www.frontiersinzoology.com/content/11/1/52/abstract},
doi = {10.1186/s12983-014-0052-2},
abstract = {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.},
language = {en},
number = {1},
urldate = {2014-07-24},
journal = {Frontiers in Zoology},
author = {Liedvogel, Miriam and Larson, Keith W. and Lundberg, Max and Gursoy, Arzu and Wassenaar, Leonard I. and Hobson, Keith A. and Bensch, Staffan and Åkesson, Susanne},
month = jul,
year = {2014},
note = {00005},
keywords = {\#nosource, Nitrogen-15, Phylloscopus trochilus, Postzygotic selection, Prezygotic selection, Willow warbler, hybrid zone, reproductive isolation},
pages = {52},
}
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