Does migration of hybrids contribute to post-zygotic isolation in flycatchers?

Veen, Thor, Svedin, Nina, Forsman, Jukka T., Hjernquist, Mårten B., Qvarnström, Anna, Thuman Hjernquist, Katherine A., Träff, Johan and Klaassen, Marcel 2007, Does migration of hybrids contribute to post-zygotic isolation in flycatchers?, Proceedings of the Royal Society B-biological sciences, vol. 274, no. 1610, pp. 707-712.

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Title Does migration of hybrids contribute to post-zygotic isolation in flycatchers?
Author(s) Veen, Thor
Svedin, Nina
Forsman, Jukka T.
Hjernquist, Mårten B.
Qvarnström, Anna
Thuman Hjernquist, Katherine A.
Träff, Johan
Klaassen, MarcelORCID iD for Klaassen, Marcel
Journal name Proceedings of the Royal Society B-biological sciences
Volume number 274
Issue number 1610
Start page 707
End page 712
Publisher The Royal Society
Place of publication London, England
Publication date 2007-03-07
ISSN 0962-8452
Keyword(s) migration
stable isotopes
extrinsic post-zygotic isolation
wintering grounds
Summary In the face of hybridization, species integrity can only be maintained through post-zygotic isolating barriers (PIBs). PIBs need not only be intrinsic (i.e. hybrid inviability and sterility caused by developmental incompatibilities), but also can be extrinsic due to the hybrid's intermediate phenotype falling between the parental niches. For example, in migratory species, hybrid fitness might be reduced as a result of intermediate migration pathways and reaching suboptimal wintering grounds. Here, we test this idea by comparing the juvenile to adult survival probabilities as well as the wintering grounds of pied flycatchers (Ficedula hypoleuca), collared flycatchers (Ficedula albicollis) and their hybrids using stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) in feathers developed at the wintering site. Our result supports earlier observations of largely segregated wintering grounds of the two parental species. The isotope signature of hybrids clustered with that of pied flycatchers. We argue that this pattern can explain the high annual survival of hybrid flycatchers. Hence, dominant expression of the traits of one of the parental species in hybrids may substantially reduce the ecological costs of hybridization.
Language eng
Field of Research 060801 Animal Behaviour
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, The Royal Society
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