Show simple item record

dc.contributor.author Valdez, Diego Javier
dc.contributor.author Vera Cortez, Marilina
dc.contributor.author Della Costa, Natalia Soledad
dc.contributor.author Leche, Alvina
dc.contributor.author Hansen, Cristian
dc.contributor.author Navarro, Joaquin Luis
dc.contributor.author Martella, Monica Beatriz
dc.date.available 2016-11-07T18:07:31Z
dc.date.issued 2014-05
dc.identifier.citation 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
dc.identifier.issn 1932-6203
dc.identifier.uri http://hdl.handle.net/11336/8027
dc.description.abstract 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.
dc.format application/pdf
dc.language.iso eng
dc.publisher Public Library Of Science
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri https://creativecommons.org/licenses/by/2.5/ar/
dc.subject ÑANDUES
dc.subject RATITES
dc.subject HORMONAS
dc.subject SEXUALES
dc.subject.classification Biología
dc.subject.classification Ciencias Biológicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Seasonal changes in plasma levels of sex hormones in the Greater Rhea (Rhea americana), a South American ratite with a complex mating system
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2016-11-03T19:16:39Z
dc.journal.volume 9
dc.journal.number e973
dc.journal.pagination 1-6
dc.journal.pais Estados Unidos
dc.journal.ciudad Pennsylvania State University
dc.description.fil Fil: Valdez, Diego Javier. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
dc.description.fil Fil: Vera Cortez, Marilina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
dc.description.fil Fil: Della Costa, Natalia Soledad. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
dc.description.fil Fil: Leche, Alvina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
dc.description.fil Fil: Hansen, Cristian. Laboratorio de Análisis Clínicos Especializados; Argentina
dc.description.fil Fil: Navarro, Joaquin Luis. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
dc.description.fil Fil: Martella, Monica Beatriz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
dc.journal.title Plos One
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0097334
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1371/journal.pone.0097334
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4023989/


Archivos asociados

This item appears in the following Collection(s)

Show simple item record

info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution 2.5 Unported (CC BY 2.5)