Sexual dimorphism and species differences in HVC volumes of cowbirds

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, and A. Kacelnik, 1996) were used to study the gross anatomy of a song control nucleus in 3 South American cow...

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Detalles Bibliográficos
Autor principal:	Reboreda, Juan Carlos
Publicado:	1999
Materias:	animal tissue article behavior bird brain region brain size female male mating nonhuman sex difference singing species difference
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07357044_v113_n5_p1095_Hauber http://hdl.handle.net/20.500.12110/paper_07357044_v113_n5_p1095_Hauber
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_07357044_v113_n5_p1095_Hauber
record_format	dspace
spelling	paper:paper_07357044_v113_n5_p1095_Hauber2023-06-08T15:44:07Z Sexual dimorphism and species differences in HVC volumes of cowbirds Reboreda, Juan Carlos animal tissue article behavior bird brain region brain size female male mating nonhuman sex difference singing species difference 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, and 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. Fil:Reboreda, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07357044_v113_n5_p1095_Hauber http://hdl.handle.net/20.500.12110/paper_07357044_v113_n5_p1095_Hauber
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	animal tissue article behavior bird brain region brain size female male mating nonhuman sex difference singing species difference
spellingShingle	animal tissue article behavior bird brain region brain size female male mating nonhuman sex difference singing species difference Reboreda, Juan Carlos Sexual dimorphism and species differences in HVC volumes of cowbirds
topic_facet	animal tissue article behavior bird brain region brain size female male mating nonhuman sex difference singing species difference
description	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, and 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.
author	Reboreda, Juan Carlos
author_facet	Reboreda, Juan Carlos
author_sort	Reboreda, Juan Carlos
title	Sexual dimorphism and species differences in HVC volumes of cowbirds
title_short	Sexual dimorphism and species differences in HVC volumes of cowbirds
title_full	Sexual dimorphism and species differences in HVC volumes of cowbirds
title_fullStr	Sexual dimorphism and species differences in HVC volumes of cowbirds
title_full_unstemmed	Sexual dimorphism and species differences in HVC volumes of cowbirds
title_sort	sexual dimorphism and species differences in hvc volumes of cowbirds
publishDate	1999
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07357044_v113_n5_p1095_Hauber http://hdl.handle.net/20.500.12110/paper_07357044_v113_n5_p1095_Hauber
work_keys_str_mv	AT reboredajuancarlos sexualdimorphismandspeciesdifferencesinhvcvolumesofcowbirds
_version_	1768544278937600000

Sexual dimorphism and species differences in HVC volumes of cowbirds

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