Biologia reprodutiva de Helicops infrataeniatus (Serpentes: Dipsadidae) da região subtropical do Brasil

Detalhes bibliográficos
Ano de defesa: 2017
Autor(a) principal: Moura, Livia Bataioli
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Santa Maria
Brasil
Bioquímica
UFSM
Programa de Pós-Graduação em Biodiversidade Animal
Centro de Ciências Naturais e Exatas
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://repositorio.ufsm.br/handle/1/20450
Resumo: ABSTRACT 1: Reproductive biology studies are funtamental for the understanding of of the life history of a species. In this work we describe the reproductive biology of the males of Helicops infrataeniatus in a Brazilian subtropical climate environment. For this morpho-anatomical and histological analysis were realized of individuals deposited in zoological collections. The reproductive cycle was described through seasonal variation in the reproductive organs: testes, kidneys and ductus deferents. Spermatogenesis occurred during late autumn–winter (June–September), spermiogenesis occurred in spring (September–December) and complete regression of the testis were in autumn (April-May). The testis showed hypertrophy in summer (January-March), while ductus deferents presented spermatozoa all over the year and did not show seasonal variation due to sperm storage. The kidney showed increase in spring (October-December), however the tubular diameter of the sexual segment of the kidney (SSK) was increase in winter (July-Setember). Therefore, at the individual level, males exhibit a discontinuous cyclical reproduction, while population level, the reproductive cycle is seasonal semisynchronous. Finally, we discuss intrinsic and extrinsic factors that influence the reproductive strategies of H. infrataeniatus.