Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system

Autores
Valdez, Diego Javier; Vera Cortez, Marilina; Della Costa, Natalia Soledad; Leche, Alvina; Hansen, Cristian; Navarro, Joaquin Luis; Martella, Monica Beatriz
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Seasonal rhythm in sex hormones has been extensively studied in birds, as well as its relationship with the type of mating system. The Greater Rhea (Rhea americana), a South American ratite species, reproduces seasonally and has a complex mating system: female-defense polygyny and sequential polyandry. The present study aimed at analyzing the endocrine basis of reproduction in this species and its relationship with its mating system. We used HPLC and electrochemiluminescence techniques to identify and measure plasma testosterone and estradiol levels. Annual oscillations in sex hormones, testosterone and estradiol, in adult males and females were observed. Lower levels of these hormones were exhibited during the non reproductive season (February to July), whereas their maximum values were reached in September for males and November-December for females. These fluctuations reflect the seasonal changes in gonadal function. By contrast, no significant sex hormones oscillations were observed in juvenile males and females (negative control of seasonal changes). Greater rheas maintain high testosterone and estradiol levels throughout the reproductive period. The high testosterone levels during incubation and chick rearing did not inhibit parental behavior in males, which appears not to conform to the ??Challenge Hypothesis??. In females, the high estradiol levels throughout the reproductive season would be needed to sustain their long egg-laying period.
Fil: Valdez, Diego Javier. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Vera Cortez, Marilina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Della Costa, Natalia Soledad. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Leche, Alvina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Hansen, Cristian. Laboratorio de Análisis Clínicos Especializados; Argentina
Fil: Navarro, Joaquin Luis. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Martella, Monica Beatriz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Materia
ÑANDUES
RATITES
HORMONAS
SEXUALES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/8027
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating systemValdez, Diego JavierVera Cortez, MarilinaDella Costa, Natalia SoledadLeche, AlvinaHansen, CristianNavarro, Joaquin LuisMartella, Monica BeatrizÑANDUESRATITESHORMONASSEXUALEShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Seasonal rhythm in sex hormones has been extensively studied in birds, as well as its relationship with the type of mating system. The Greater Rhea (Rhea americana), a South American ratite species, reproduces seasonally and has a complex mating system: female-defense polygyny and sequential polyandry. The present study aimed at analyzing the endocrine basis of reproduction in this species and its relationship with its mating system. We used HPLC and electrochemiluminescence techniques to identify and measure plasma testosterone and estradiol levels. Annual oscillations in sex hormones, testosterone and estradiol, in adult males and females were observed. Lower levels of these hormones were exhibited during the non reproductive season (February to July), whereas their maximum values were reached in September for males and November-December for females. These fluctuations reflect the seasonal changes in gonadal function. By contrast, no significant sex hormones oscillations were observed in juvenile males and females (negative control of seasonal changes). Greater rheas maintain high testosterone and estradiol levels throughout the reproductive period. The high testosterone levels during incubation and chick rearing did not inhibit parental behavior in males, which appears not to conform to the ??Challenge Hypothesis??. In females, the high estradiol levels throughout the reproductive season would be needed to sustain their long egg-laying period.Fil: Valdez, Diego Javier. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; ArgentinaFil: Vera Cortez, Marilina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; ArgentinaFil: Della Costa, Natalia Soledad. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; ArgentinaFil: Leche, Alvina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; ArgentinaFil: Hansen, Cristian. Laboratorio de Análisis Clínicos Especializados; ArgentinaFil: Navarro, Joaquin Luis. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; ArgentinaFil: Martella, Monica Beatriz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; ArgentinaPublic Library Of Science2014-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/8027Valdez, Diego Javier; Vera Cortez, Marilina; Della Costa, Natalia Soledad; Leche, Alvina; Hansen, Cristian; et al.; Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system; Public Library Of Science; Plos One; 9; e973; 5-2014; 1-61932-6203enginfo:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0097334info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0097334info:eu-repo/semantics/altIdentifier/url/https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4023989/info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:49:15Zoai:ri.conicet.gov.ar:11336/8027instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:49:15.796CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system
title Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system
spellingShingle Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system
Valdez, Diego Javier
ÑANDUES
RATITES
HORMONAS
SEXUALES
title_short Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system
title_full Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system
title_fullStr Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system
title_full_unstemmed Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system
title_sort Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system
dc.creator.none.fl_str_mv Valdez, Diego Javier
Vera Cortez, Marilina
Della Costa, Natalia Soledad
Leche, Alvina
Hansen, Cristian
Navarro, Joaquin Luis
Martella, Monica Beatriz
author Valdez, Diego Javier
author_facet Valdez, Diego Javier
Vera Cortez, Marilina
Della Costa, Natalia Soledad
Leche, Alvina
Hansen, Cristian
Navarro, Joaquin Luis
Martella, Monica Beatriz
author_role author
author2 Vera Cortez, Marilina
Della Costa, Natalia Soledad
Leche, Alvina
Hansen, Cristian
Navarro, Joaquin Luis
Martella, Monica Beatriz
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv ÑANDUES
RATITES
HORMONAS
SEXUALES
topic ÑANDUES
RATITES
HORMONAS
SEXUALES
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Seasonal rhythm in sex hormones has been extensively studied in birds, as well as its relationship with the type of mating system. The Greater Rhea (Rhea americana), a South American ratite species, reproduces seasonally and has a complex mating system: female-defense polygyny and sequential polyandry. The present study aimed at analyzing the endocrine basis of reproduction in this species and its relationship with its mating system. We used HPLC and electrochemiluminescence techniques to identify and measure plasma testosterone and estradiol levels. Annual oscillations in sex hormones, testosterone and estradiol, in adult males and females were observed. Lower levels of these hormones were exhibited during the non reproductive season (February to July), whereas their maximum values were reached in September for males and November-December for females. These fluctuations reflect the seasonal changes in gonadal function. By contrast, no significant sex hormones oscillations were observed in juvenile males and females (negative control of seasonal changes). Greater rheas maintain high testosterone and estradiol levels throughout the reproductive period. The high testosterone levels during incubation and chick rearing did not inhibit parental behavior in males, which appears not to conform to the ??Challenge Hypothesis??. In females, the high estradiol levels throughout the reproductive season would be needed to sustain their long egg-laying period.
Fil: Valdez, Diego Javier. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Vera Cortez, Marilina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Della Costa, Natalia Soledad. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Leche, Alvina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Hansen, Cristian. Laboratorio de Análisis Clínicos Especializados; Argentina
Fil: Navarro, Joaquin Luis. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Fil: Martella, Monica Beatriz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
description Seasonal rhythm in sex hormones has been extensively studied in birds, as well as its relationship with the type of mating system. The Greater Rhea (Rhea americana), a South American ratite species, reproduces seasonally and has a complex mating system: female-defense polygyny and sequential polyandry. The present study aimed at analyzing the endocrine basis of reproduction in this species and its relationship with its mating system. We used HPLC and electrochemiluminescence techniques to identify and measure plasma testosterone and estradiol levels. Annual oscillations in sex hormones, testosterone and estradiol, in adult males and females were observed. Lower levels of these hormones were exhibited during the non reproductive season (February to July), whereas their maximum values were reached in September for males and November-December for females. These fluctuations reflect the seasonal changes in gonadal function. By contrast, no significant sex hormones oscillations were observed in juvenile males and females (negative control of seasonal changes). Greater rheas maintain high testosterone and estradiol levels throughout the reproductive period. The high testosterone levels during incubation and chick rearing did not inhibit parental behavior in males, which appears not to conform to the ??Challenge Hypothesis??. In females, the high estradiol levels throughout the reproductive season would be needed to sustain their long egg-laying period.
publishDate 2014
dc.date.none.fl_str_mv 2014-05
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/8027
Valdez, Diego Javier; Vera Cortez, Marilina; Della Costa, Natalia Soledad; Leche, Alvina; Hansen, Cristian; et al.; Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system; Public Library Of Science; Plos One; 9; e973; 5-2014; 1-6
1932-6203
url http://hdl.handle.net/11336/8027
identifier_str_mv Valdez, Diego Javier; Vera Cortez, Marilina; Della Costa, Natalia Soledad; Leche, Alvina; Hansen, Cristian; et al.; Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system; Public Library Of Science; Plos One; 9; e973; 5-2014; 1-6
1932-6203
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0097334
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0097334
info:eu-repo/semantics/altIdentifier/url/https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4023989/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Public Library Of Science
publisher.none.fl_str_mv Public Library Of Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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