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Competition-driven build-up of habitat isolation and selection favoring modified dispersal patterns in a young avian hybrid zone
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology. Univ Helsinki, Zool Unit, Finnish Museum Nat Hist, FIN-00014 Helsinki, Finland..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
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2016 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 70, no 10, 2226-2238 p.Article in journal (Refereed) Published
Abstract [en]

Competition-driven evolution of habitat isolation is an important mechanism of ecological speciation but empirical support for this process is often indirect. We examined how an on-going displacement of pied flycatchers from their preferred breeding habitat by collared flycatchers in a young secondary contact zone is associated with (a) access to an important food resource (caterpillar larvae), (b) immigration of pied flycatchers in relation to habitat quality, and (c) the risk of hybridization in relation to habitat quality. Over the past 12 years, the estimated access to caterpillar larvae biomass in the habitat surrounding the nests of pied flycatchers has decreased by a fifth due to shifted establishment possibilities, especially for immigrants. However, breeding in the high quality habitat has become associated with such a high risk of hybridization for pied flycatchers that overall selection currently favors pied flycatchers that were forced to immigrate into the poorer habitats (despite lower access to preferred food items). Our results show that competition-driven habitat segregation can lead to fast habitat isolation, which per se caused an opportunity for selection to act in favor of future "voluntarily" altered immigration patterns and possibly strengthened habitat isolation through reinforcement.

Place, publisher, year, edition, pages
2016. Vol. 70, no 10, 2226-2238 p.
Keyword [en]
Competitive exclusion, ecological speciation, habitat segregation, prezygotic isolation, speciation
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-307727DOI: 10.1111/evo.13019ISI: 000385550700005PubMedID: 27464950OAI: oai:DiVA.org:uu-307727DiVA: diva2:1048431
Funder
Swedish Research Council
Available from: 2016-11-21 Created: 2016-11-21 Last updated: 2016-11-21Bibliographically approved

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McFarlane, S. ErynWheatcroft, DavidÅlund, MurielleQvarnström, Anna
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