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Abstract:

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.

Registro:

Documento: Artículo
Título:Increased plumage darkness of female Shiny Cowbirds Molothrus bonariensis in the subtropics: An adaptation to bacterial degradation?
Autor:Mahler, B.; Lopez, N.I.; Di Giacomo, A.G.; Reboreda, J.C.
Filiación:Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, C1428EGA Buenos Aires, Argentina
Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, C1428EGA Buenos Aires, Argentina
Departamento de Conservación, Aves Argentinas/Asociación Ornitológica del Plata, Matheu 1246, C1249AAB, Buenos Aires, Argentina
Palabras clave:Bacillus licheniformis; Bacteria; Feather degradation; Melanization; Molothrus bonariensis; adaptation; bacterium; biodegradation; color morph; melanin; microbial activity; passerine; physiological response; plumage; polymorphism; selection; sexual dimorphism; subtropical region; Argentina; Bacillus licheniformis; Bacteria (microorganisms); Molothrus bonariensis
Año:2010
Volumen:152
Número:4
Página de inicio:775
Página de fin:781
DOI: http://dx.doi.org/10.1111/j.1474-919X.2010.01044.x
Título revista:Ibis
Título revista abreviado:Ibis
ISSN:00191019
CODEN:IBISA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00191019_v152_n4_p775_Mahler

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Citas:

---------- APA ----------
Mahler, B., Lopez, N.I., Di Giacomo, A.G. & Reboreda, J.C. (2010) . Increased plumage darkness of female Shiny Cowbirds Molothrus bonariensis in the subtropics: An adaptation to bacterial degradation?. Ibis, 152(4), 775-781.
http://dx.doi.org/10.1111/j.1474-919X.2010.01044.x
---------- CHICAGO ----------
Mahler, B., Lopez, N.I., Di Giacomo, A.G., Reboreda, J.C. "Increased plumage darkness of female Shiny Cowbirds Molothrus bonariensis in the subtropics: An adaptation to bacterial degradation?" . Ibis 152, no. 4 (2010) : 775-781.
http://dx.doi.org/10.1111/j.1474-919X.2010.01044.x
---------- MLA ----------
Mahler, B., Lopez, N.I., Di Giacomo, A.G., Reboreda, J.C. "Increased plumage darkness of female Shiny Cowbirds Molothrus bonariensis in the subtropics: An adaptation to bacterial degradation?" . Ibis, vol. 152, no. 4, 2010, pp. 775-781.
http://dx.doi.org/10.1111/j.1474-919X.2010.01044.x
---------- VANCOUVER ----------
Mahler, B., Lopez, N.I., Di Giacomo, A.G., Reboreda, J.C. Increased plumage darkness of female Shiny Cowbirds Molothrus bonariensis in the subtropics: An adaptation to bacterial degradation?. Ibis. 2010;152(4):775-781.
http://dx.doi.org/10.1111/j.1474-919X.2010.01044.x