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운영자

2005-05-31 20:26:00 | Hit : 22916 | Vote : 7434

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[자료] The evolution of plumage polymorphism in birds of prey and owls:

The evolution of plumage polymorphism in birds of prey and owls:
the apostatic selection hypothesis revisited

M. K. FOWLIE* & O. KRU ¨ GER

*Division of Environmental and Evolutionary Biology, University of Glasgow, Glasgow, UK
Department of Zoology, University of Cambridge, Cambridge, UK

Keywords:

apostatic selection; birds of prey; comparative analysis; owls; polymorphism; population size.

Abstract

Co-evolution between phenotypic variation and other traits is of paramount
importance for our understanding of the origin and maintenance of
polymorphism in natural populations. We tested whether the evolution of
plumage polymorphism in birds of prey and owls was supported by the
apostatic selection hypothesis using ecological and life-history variables in
birds of prey and owls and performing both cross taxa and independent
contrast analyses. For both bird groups, we did not find any support for the
apostatic selection hypothesis being the maintaining factor for the poly-morphism:
plumage polymorphism was not more common in taxa hunting
avian or mammalian prey, nor in migratory species. In contrast, we found that
polymorphism was related to variables such as sexual plumage dimorphism,
population size and range size, as well as breeding altitude and breeding
latitude. These results imply that the most likely evolutionary correlate of
polymorphism in both bird groups is population size, different plumage
morphs might simply arise in larger populations most likely because of a
higher probability of mutations and then be maintained by sexual selection.

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Next	[자료] THE EVOLUTION OF REVERSED SEXUAL DIMORPHISM IN OWLS: AN EMPIRICAL ANALYSIS OF POSSIBLE SELECTIVE FACTORS	운영자	2005/05/31