ORTIZ martin alejandro
congresos y reuniones científicas
Reproductive Biology of Tropidurus torquatus (Squamata: Tropiduridae) in Corrientes, Argentina
ORTIZ, MARTÍN ; ÁLVAREZ, BLANCA B.
San Carlos de Bariloche
Congreso; VI Southern Connection Congress. Gondwana Reunited: A Southern Perspective for a Changing World; 2010
Universidad Nacional del Comahue, CONICET, INTA
We analyzed the reproductive activity of a population of Tropidurus torquatus from northeastern Argentina in order to notice if environmental differences from different part of its distribution result in variation in its reproductive traits. The study was carried out in Corrientes locality, belonging to District Oriental of Chaco Province, Argentina. Collections were made between December 2007 and November 2009. The male reproductive activity was determined through histology of gonads and epididymis and using gonadosomatic indexes. We determined reproductive cycle of females on the base of the presence of vitellogenic follicles, oviductal eggs, and corpora lutea. Males contained sperm in seminiferous tubules year-round, but the maximum values of testicular length were in September-October. Vitellogenic females were found from July to December and oviductal eggs in September, October, December, and January pointing out that males and females have synchronic reproductive activity. We found that the reproductive cycle of T. torquatus from Corrientes was similar to a Cerrado population (Brazil) but the clutch size and minimum size at sexual maturity are higher than in the coastal populations of the Atlantic Forest biome (Brazil), probably because variations in the local environmental conditions affect positively growth rates of the Chaco Province population resulting in a higher average body size of females.