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Abstract:

In some sexually dichromatic passerines, juvenile males retain a plumage similar to that of adult females through their first year or longer (delayed plumage maturation). The Tawny-bellied Seedeater (Sporophila hypoxantha) is a sexually dichromatic species in which, to the human eye, the juveniles look like females. We analyzed the species' stages of plumage maturation by reflectance spectrometry and a visual model of color discrimination on captive individuals of known ages. We found that males retain a plumage different from that of adult males through their first breeding season. By the time males passed the age of 1 year, their color did not differ from that of adult males in any region of the body except the crown. Spectrophotometry also revealed differences between the plumage color of juvenile males and females, and the color-discrimination model implies that the birds should be able to detect these differences. Thus juvenile males of the Tawny-bellied Seedeater acquire adult plumage after their first breeding season but are already dichromatic during the first year. How this pattern of plumage development affects the species' reproductive or other social behavior deserves further study. © The Cooper Ornithological Society 2011.

Registro:

Documento: Artículo
Título:Stages of plumage maturation of the Tawny-bellied Seedeater: Evidence of delayed plumage maturation and cryptic differentiation between juveniles and females
Autor:Facchinetti, C.; Mahler, B.; Di Giacomo, A.G.; Reboreda, J.C.
Filiación:Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EGA Buenos Aires, Argentina
Departamento de Conservación, Aves Argentinas/Asociación Ornitológica Del Plata, Matheu 1246, C1249AAB Buenos Aires, Argentina
Palabras clave:Avian visual modeling; Plumage color; Plumage reflectance; Sporophila hypoxantha; Tawnybellied Seedeater
Año:2011
Volumen:113
Número:4
Página de inicio:907
Página de fin:914
DOI: http://dx.doi.org/10.1525/cond.2011.110010
Título revista:Condor
Título revista abreviado:Condor
ISSN:00105422
CODEN:CNDRA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v113_n4_p907_Facchinetti

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Citas:

---------- APA ----------
Facchinetti, C., Mahler, B., Di Giacomo, A.G. & Reboreda, J.C. (2011) . Stages of plumage maturation of the Tawny-bellied Seedeater: Evidence of delayed plumage maturation and cryptic differentiation between juveniles and females. Condor, 113(4), 907-914.
http://dx.doi.org/10.1525/cond.2011.110010
---------- CHICAGO ----------
Facchinetti, C., Mahler, B., Di Giacomo, A.G., Reboreda, J.C. "Stages of plumage maturation of the Tawny-bellied Seedeater: Evidence of delayed plumage maturation and cryptic differentiation between juveniles and females" . Condor 113, no. 4 (2011) : 907-914.
http://dx.doi.org/10.1525/cond.2011.110010
---------- MLA ----------
Facchinetti, C., Mahler, B., Di Giacomo, A.G., Reboreda, J.C. "Stages of plumage maturation of the Tawny-bellied Seedeater: Evidence of delayed plumage maturation and cryptic differentiation between juveniles and females" . Condor, vol. 113, no. 4, 2011, pp. 907-914.
http://dx.doi.org/10.1525/cond.2011.110010
---------- VANCOUVER ----------
Facchinetti, C., Mahler, B., Di Giacomo, A.G., Reboreda, J.C. Stages of plumage maturation of the Tawny-bellied Seedeater: Evidence of delayed plumage maturation and cryptic differentiation between juveniles and females. Condor. 2011;113(4):907-914.
http://dx.doi.org/10.1525/cond.2011.110010