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Reproductive character displacement of female, but not male song discrimination in an 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.ORCID iD: 0000-0002-1178-4053
2017 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 71, no 7, 1776-1786 p.Article in journal (Refereed) Published
Abstract [en]

Divergence of male sexual signals and female preferences for those signals often maintains reproductive boundaries between closely related, co-occurring species. However, contrasting sources of selection, such as interspecific competition, can lead to weak divergence or even convergence of sexual signals in sympatry. When signals converge, assortative mating can be maintained if the mating preferences of females diverge in sympatry (reproductive character displacement; RCD), but there are few explicit examples. Pied flycatchers (Ficedula hypoleuca) are sympatric with collared flycatchers (F. albicollis) on the Baltic island of oland, where males from both species compete over nestboxes, their songs converge, and the two species occasionally hybridize. We compare song discrimination of male and female pied flycatchers on oland and in an allopatric population on the Swedish mainland. Using field choice trials, we show that male pied flycatchers respond similarly to the songs of both species in sympatry and allopatry, while female pied flycatchers express stronger discrimination against heterospecific songs in sympatry than in allopatry. These results are consistent with RCD of song discrimination of female pied flycatchers where they co-occur with collared flycatchers, which should maintain species assortative mating despite convergence of male sexual signals.

Place, publisher, year, edition, pages
WILEY , 2017. Vol. 71, no 7, 1776-1786 p.
Keyword [en]
Ficedula, reinforcement, reproductive character displacement, sexual signals, song discrimination, species recognition
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-331248DOI: 10.1111/evo.13267ISI: 000405888100004PubMedID: 28493350OAI: oai:DiVA.org:uu-331248DiVA: diva2:1151641
Funder
Swedish Research CouncilThe Royal Swedish Academy of Sciences
Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2017-10-24Bibliographically approved

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Wheatcroft, DavidQvarnström, Anna

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