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Direct costs and benefits for hybridizing Ficedula flycatchers

Wiley, C. and Fogelberg, N. and Saether, S.A. and Veen, T. and Svedin, N. and Kehlenbeck, J.V. and Qvarnström, A. (2007) Direct costs and benefits for hybridizing Ficedula flycatchers. Journal of Evolutionary Biology, 20, 854-864. ISSN 1010-061X.

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Official URL: http://dx.doi.org/10.1111/j.1420-9101.2007.01316.x

Abstract

It is well understood that females may gain direct benefits from breeding with attractive males. However, the direct fitness effects of mate-choice are rarely considered with respect to mating between different species (hybridization), a field dominated by discussion of indirect costs of producing unfit hybrid offspring. Hybridizing females may also gain by the types of direct benefits that are important for intraspecific mate choice, and in addition may have access to certain benefits that are restricted to mating with males of an ecologically diverged sister-taxon. We investigate possible direct benefits and costs female Ficedula flycatchers gain from breeding with a heterospecific male, and demonstrate that hybridizing female collared flycatchers (F. albicollis) breed in territories that do not suffer the seasonal decline in habitat quality experienced by females breeding with conspecifics. We exclude the hypotheses that heterospecific males provide alternative food-types or assume a greater amount of the parental workload. In fact, the diets of the two species (F. albicollis and F. hypoleuca) were highly similar, suggesting possible interspecific competition over food resources in sympatry. We discuss the implications of direct fitness effects of hybridization, and why there has been such a disparity in the attention paid to such benefits and costs with regard to intraspecific and interspecific mate-choice.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:4602
Deposited On:16 Sep 2009 02:00
Last Modified:24 Apr 2012 16:48

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