Divergent male androgen patterns in two sympatric species of Leptodactylus from subtropical South America

Leptodactylus ocellatus L. is sympatric with L. chaquensis Cei on the banks of the Parana river, yet does not show evident gametogenic discontinuity or cyclical variation of secondary sex characters compared with the striking and well-defined seasonal rhythm found in L. chaquensis. The endocrine mec...

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Detalles Bibliográficos
Autores principales: Cei, José Miguel Alfredo María, Ibañez, N., Alvarez, B B., Carnevali, O., Mosconi, G., Polzonetti-Magni, A. M.
Formato: Articulo
Lenguaje:Inglés
Publicado: 1996
Materias:
Zoología
Leptodactylus
Reproductive cycle
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/90021
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-90021
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Zoología
Leptodactylus
Reproductive cycle
spellingShingle Zoología
Leptodactylus
Reproductive cycle
Cei, José Miguel Alfredo María
Ibañez, N.
Alvarez, B B.
Carnevali, O.
Mosconi, G.
Polzonetti-Magni, A. M.
Divergent male androgen patterns in two sympatric species of Leptodactylus from subtropical South America
topic_facet Zoología
Leptodactylus
Reproductive cycle
description Leptodactylus ocellatus L. is sympatric with L. chaquensis Cei on the banks of the Parana river, yet does not show evident gametogenic discontinuity or cyclical variation of secondary sex characters compared with the striking and well-defined seasonal rhythm found in L. chaquensis. The endocrine mechanisms regulating the seasonal reproductive cycle in the male of both species in their sympatric area have been studied through assessment of plasma androgens, related to the morphological examination of testis. A sudden intense spermatogenic activity was recorded in the testes of L. chaquensis in spring months (September-October), but this ceased in late November, and was followed by a strikingly long summer rest. Conversely, few morphological changes in L. ocellatus were found, since the mating period is more irregular and extensive. The androgen plasma changes paralleled the morphological observations. The plasma androgens behaved differently in the two species, since in L. chaquensis the androgen peak values occurred at the end of the intense spermatogenic activity, accompanied by dramatic increase of testicular weight and spermiation, while in L. ocellatus, the highest androgen plasma levels, occurring in August, seemed to indicate a precocious reproductive activity in this species. These data are discussed, in view of the pivotal role played by androgens in regulating the discontinuous reproductive cycle of L. chaquensis.
format Articulo
Articulo
author Cei, José Miguel Alfredo María
Ibañez, N.
Alvarez, B B.
Carnevali, O.
Mosconi, G.
Polzonetti-Magni, A. M.
author_facet Cei, José Miguel Alfredo María
Ibañez, N.
Alvarez, B B.
Carnevali, O.
Mosconi, G.
Polzonetti-Magni, A. M.
author_sort Cei, José Miguel Alfredo María
title Divergent male androgen patterns in two sympatric species of Leptodactylus from subtropical South America
title_short Divergent male androgen patterns in two sympatric species of Leptodactylus from subtropical South America
title_full Divergent male androgen patterns in two sympatric species of Leptodactylus from subtropical South America
title_fullStr Divergent male androgen patterns in two sympatric species of Leptodactylus from subtropical South America
title_full_unstemmed Divergent male androgen patterns in two sympatric species of Leptodactylus from subtropical South America
title_sort divergent male androgen patterns in two sympatric species of leptodactylus from subtropical south america
publishDate 1996
url http://sedici.unlp.edu.ar/handle/10915/90021
work_keys_str_mv AT ceijosemiguelalfredomaria divergentmaleandrogenpatternsintwosympatricspeciesofleptodactylusfromsubtropicalsouthamerica
AT ibanezn divergentmaleandrogenpatternsintwosympatricspeciesofleptodactylusfromsubtropicalsouthamerica
AT alvarezbb divergentmaleandrogenpatternsintwosympatricspeciesofleptodactylusfromsubtropicalsouthamerica
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AT polzonettimagniam divergentmaleandrogenpatternsintwosympatricspeciesofleptodactylusfromsubtropicalsouthamerica
bdutipo_str Repositorios
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