Sexual dimorphism and species differences in HVC volumes of cowbirds.
Behav Neurosci
; 113(5): 1095-9, 1999 Oct.
Article
en En
| MEDLINE
| ID: mdl-10571492
ABSTRACT
Cowbirds exhibit extensive variation in their social, territorial, and reproductive behaviors. Nissl-stained brain sections of specimens from a previous study (J. C. Reboreda, N. S. Clayton, & A. Kacelnik, 1996) were used to study the gross anatomy of a song control nucleus in 3 South American cowbirds (bay-winged, Molothrus badius; shiny, M. bonariensis; and screaming, M. rufoaxillaris). Cowbird high vocal center (HVC) volumes were consistently higher in males than in females in all 3 species. The largest HVC size of females found in bay-winged cowbirds is consistent with observations that females of this species, but not of the other 2 species, occasionally sing. The extent of the sexual dimorphism of relative HVC size was highest for the sexually dichromatic and promiscuous shiny cowbirds and smaller for the monochromatic and monogamous bay-winged and screaming cowbirds, suggesting that selection pressures associated with morphological traits and social systems are reflected in brain architecture.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Conducta Sexual Animal
/
Telencéfalo
/
Vocalización Animal
/
Pájaros Cantores
Límite:
Animals
Idioma:
En
Revista:
Behav Neurosci
Año:
1999
Tipo del documento:
Article
País de afiliación:
Estados Unidos