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Abstract:

Sexually dichromatic birds often show delayed plumage maturation, but second-year (SY) males may or may not be distinguishable from females. In competitive contexts, SY males receive a reduced amount of adult males’ aggression, either by mimicking females or through signaling their sex and inexperience as subordinate males. To the human eye, reproductive dull SY male Saffron Finches are indistinguishable from females, whereas after second-year (ASY) males are golden yellow. Our aim is to establish whether SY males are sexually dichromatic with females to the eye of conspecifics. We describe plumage variation in females, SY and ASY males and, in particular, analyze assortative mating by color by comparing a previously disregarded yellow feather patch shared by the three groups. We measured plumage reflectance of the forehead, breast, belly, and axillaries, and used a two-step avian visual model analysis to estimate the ability of Saffron Finches to distinguish between SY males and females. We find that those groups are indistinguishable to conspecifics by color. Furthermore, we find non-significant evidence of assortative mating directly related to the coloration of comparable feather patches between females and each type of male, though body condition of SY males is associated to that of their mates. Our results are compatible with both the female-mimicry and the status signaling hypotheses of evolution and maintenance of delayed plumage maturation. However, the singing behavior of males reveals their presence within the breeding site; the combined effect of song and dull coloration suggest that SY males are honestly revealing their sex and status to conspecifics. © 2018 Benítez Saldívar, Massoni. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Registro:

Documento: Artículo
Título:Lack of conspecific visual discrimination between second-year males and females in the Saffron Finch
Autor:Saldívar, M.J.B.; Massoni, V.
Filiación:Instituto de Ecología, Genética y Evolución de Buenos Aires, IEGEBA-CONICET, Buenos Aires, Argentina
Departamento de Ecología, Genética y Evolución, Facultad de Cs. Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Instituto Multidisciplinario de Biología Vegetal, UNC-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
Palabras clave:adult; animal experiment; article; assortative mating; body constitution; breast; breeding; feather; female; finch; forehead; male; maturation; nonhuman; signal transduction; singing; visual discrimination
Año:2018
Volumen:13
Número:12
DOI: http://dx.doi.org/10.1371/journal.pone.0209549
Título revista:PLoS ONE
Título revista abreviado:PLoS ONE
ISSN:19326203
CODEN:POLNC
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19326203_v13_n12_p_Saldivar

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Citas:

---------- APA ----------
Saldívar, M.J.B. & Massoni, V. (2018) . Lack of conspecific visual discrimination between second-year males and females in the Saffron Finch. PLoS ONE, 13(12).
http://dx.doi.org/10.1371/journal.pone.0209549
---------- CHICAGO ----------
Saldívar, M.J.B., Massoni, V. "Lack of conspecific visual discrimination between second-year males and females in the Saffron Finch" . PLoS ONE 13, no. 12 (2018).
http://dx.doi.org/10.1371/journal.pone.0209549
---------- MLA ----------
Saldívar, M.J.B., Massoni, V. "Lack of conspecific visual discrimination between second-year males and females in the Saffron Finch" . PLoS ONE, vol. 13, no. 12, 2018.
http://dx.doi.org/10.1371/journal.pone.0209549
---------- VANCOUVER ----------
Saldívar, M.J.B., Massoni, V. Lack of conspecific visual discrimination between second-year males and females in the Saffron Finch. PLoS ONE. 2018;13(12).
http://dx.doi.org/10.1371/journal.pone.0209549