info:eu-repo/semantics/article
Effects of Incubation and Rearing Temperatures on Caiman latirostris Growth
Fecha
2010-05Registro en:
Parachu Marco, Maria Virginia; Piña, Carlos Ignacio; Simoncini, Melina Soledad; Larriera, Alejandro; Effects of Incubation and Rearing Temperatures on Caiman latirostris Growth; Academia Sinica; Zoological Studies; 49; 3; 5-2010; 367-373
1021-5506
CONICET Digital
CONICET
Autor
Parachu Marco, Maria Virginia
Piña, Carlos Ignacio
Simoncini, Melina Soledad
Larriera, Alejandro
Resumen
Different studies found that incubation temperature has an influence on the size of Caiman latirostris hatchlings and determines their gonadal sex. Experimental manipulations revealed that the effects of temperature on growth are independent of sex. Ambient temperature after hatching is also an influential factor: juvenile caiman had lower growth at a cool (29°C) vs. a warm temperature (33°C) independent of incubation temperatures. Two-month-old caiman were raised at 2 different temperatures (29 and 33°C) for 100 d. These animals were subjected to different incubation treatments: 29, 31 (females), 33 (males), and 33°C with 17β-estradiol (females). No differences were found in growth based on incubation temperature or sex. Our data indicate that the evolutionary advantage of a temperature-dependent sex determination, if it exists, is not bound to differential growth between the sexes nor to incubation temperature, at least in the 1st stages of life before hatchlings reach their 1st winter. Temperatures during the development and grow-out phases have direct effects on the size of the broad-snouted caiman.