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., ...Daha Fazla

FRONTIERS IN ZOOLOGY, cilt.11, 2014 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 11
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1186/s12983-014-0052-2
  • Dergi Adı: FRONTIERS IN ZOOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Hybrid zone, Prezygotic selection, Postzygotic selection, Reproductive isolation, Willow warbler, Phylloscopus trochilus, Nitrogen-15, REPRODUCTIVE ISOLATION, GENETIC-BASIS, POPULATION, EVOLUTION, TROCHILUS, ORIENTATION, INHERITANCE, INFERENCE, SELECTION, SOFTWARE
  • Ankara Üniversitesi Adresli: Hayır

Özet

Introduction: 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 (delta N-15) 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.