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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/


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