Increased plumage darkness of female Shiny Cowbirds Molothrus bonariensis in the subtropics: An adaptation to bacterial degradation?

The Shiny Cowbird Molothrus bonariensis is a sexually dichromatic species, in which males have blackish-blue iridescence and females are dull brown. However, in some subtropical parts of its distribution, females show a plumage polymorphism that ranges from dull brown to dark brown and even black. P...

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Autor principal: Mahler, Bettina
Otros Autores: Lopez, N.I, Di Giacomo, A.G, Reboreda, Juan Carlos
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2010
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100 1 |a Mahler, Bettina 
245 1 0 |a Increased plumage darkness of female Shiny Cowbirds Molothrus bonariensis in the subtropics: An adaptation to bacterial degradation? 
260 |c 2010 
270 1 0 |m Mahler, B.; Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, C1428EGA Buenos Aires, Argentina; email: bemahler@ege.fcen.uba.ar 
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506 |2 openaire  |e Política editorial 
520 3 |a The Shiny Cowbird Molothrus bonariensis is a sexually dichromatic species, in which males have blackish-blue iridescence and females are dull brown. However, in some subtropical parts of its distribution, females show a plumage polymorphism that ranges from dull brown to dark brown and even black. Plumage melanization has been shown to protect feathers from bacterial degradation, decreasing the effects of harmful bacterial activity and thus plumage damage. In this study, we assessed whether bacterial feather-degrading activity is acting as the selective force to increase darkness in the plumage of the female Shiny Cowbirds in Argentina. We compared the degradation of female Shiny Cowbird feathers belonging to different colour morphs when exposed to bacterial strains isolated from subtropical and temperate zones of its distribution, as well as to Bacillus licheniformis. We did not find differences in susceptibility to bacterial degradation between brown feathers and darker feathers. These results suggest that female plumage polymorphism in Shiny Cowbirds has not arisen as a defence against bacterial feather-degrading activity. © 2010 The Authors. Journal compilation © 2010 British Ornithologists' Union.  |l eng 
593 |a Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, C1428EGA Buenos Aires, Argentina 
593 |a Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, C1428EGA Buenos Aires, Argentina 
593 |a Departamento de Conservación, Aves Argentinas/Asociación Ornitológica del Plata, Matheu 1246, C1249AAB, Buenos Aires, Argentina 
651 4 |a ARGENTINA 
690 1 0 |a BACILLUS LICHENIFORMIS 
690 1 0 |a BACTERIA 
690 1 0 |a FEATHER DEGRADATION 
690 1 0 |a MELANIZATION 
690 1 0 |a MOLOTHRUS BONARIENSIS 
690 1 0 |a ADAPTATION 
690 1 0 |a BACTERIUM 
690 1 0 |a BIODEGRADATION 
690 1 0 |a COLOR MORPH 
690 1 0 |a MELANIN 
690 1 0 |a MICROBIAL ACTIVITY 
690 1 0 |a PASSERINE 
690 1 0 |a PHYSIOLOGICAL RESPONSE 
690 1 0 |a PLUMAGE 
690 1 0 |a POLYMORPHISM 
690 1 0 |a SELECTION 
690 1 0 |a SEXUAL DIMORPHISM 
690 1 0 |a SUBTROPICAL REGION 
690 1 0 |a BACILLUS LICHENIFORMIS 
690 1 0 |a BACTERIA (MICROORGANISMS) 
690 1 0 |a MOLOTHRUS BONARIENSIS 
700 1 |a Lopez, N.I. 
700 1 |a Di Giacomo, A.G. 
700 1 |a Reboreda, Juan Carlos 
773 0 |d 2010  |g v. 152  |h pp. 775-781  |k n. 4  |p Ibis  |x 00191019  |w (AR-BaUEN)CENRE-4933  |t Ibis 
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