The reproductive cycle of the male sleep snake Sibynomorphus mikanii (Schlegel, 1837) from southeastern brazil

Autor(es)

Rojas, Claudio A. ^{[1, 2]} ; Barros, Veronica A. ^{[1, 3]} ; Almeida-Santos, Selma M. ^{[1, 3, 2]}

Afiliação do(s) autor(es)

^[1] Inst Butantan, Lab Ecol & Evolucao, BR-05503900 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Fac Med Vet & Zootecnia, Programa Posgrad Anat Anim Domest & Silvestres, BR-09500900 Sao Paulo - Brazil

^[3] Univ Estadual Paulista Julio Mesquita Filho UNESP, Programa Posgrad Biol Anim, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Morphology; v. 274, n. 2, p. 215-228, FEB 2013.
• Citações Web of Science: 14

Resumo

This study describes the male reproductive cycle of Sibynomorphus mikanii from southeastern Brazil considering macroscopic and microscopic variables. Spermatogenesis occurs during springsummer (SeptemberDecember) and spermiogenesis or maturation occurs in summer (DecemberFebruary). The length and width of the kidney, the tubular diameter, and the epithelium height of the sexual segment of the kidney (SSK) are larger in summerautumn (DecemberMay). Histochemical reaction of the SSK {[}periodic acid-Schiff (PAS) and bromophenol blue (BB)] shows stronger results during summerautumn, indicating an increase in the secretory activity of the granules. Testicular regression is observed in autumn and early winter (MarchJune) when a peak in the width of the ductus deferens occurs. The distal ductus deferens as well as the ampulla ductus deferentis exhibit secretory activities with positive reaction for PAS and BB. These results suggest that this secretion may nourish the spermatozoa while they are being stored in the ductus deferens. The increase in the Leydig cell nuclear diameter in association with SSK hypertrophy and the presence of sperm in the female indicate that the mating season occurs in autumn when testes begin to decrease their activity. The peak activity of Leydig cells and SSK exhibits an associated pattern with the mating season. However, spermatogenesis is dissociated of the copulation characterizing a complex reproductive cycle. At the individual level, S. mikanii males present a continuous cyclical reproductive pattern in the testes and kidneys (SSK), whereas at the populational level the reproductive pattern may be classified as seasonal semisynchronous. (c) J. Morphol., 2013. (c) 2012 Wiley Periodicals, Inc. (AU)

• Processo FAPESP: 07/51969-0 - Modulação fisiológica do ciclo reprodutivo, comportamento sexual e atividade sazonal em Sibynomorphus mikanii e Sibynomorphus neuwiedii (dormideira)
• Beneficiário: Claudio Augusto Rojas
• Modalidade de apoio: Bolsas no Brasil - Mestrado