INVESTIGADORES
LEIVA Pamela Maria De Lujan
congresos y reuniones científicas
Título:
Effect of temperature fluctuation during incubation on sex determination in Caiman latirostris
Autor/es:
MATIAS N. BELLA; MELINA S. SIMONCINI; ALEJANDRO LARRIERA; CARLOS I. PIÑA; PAMELA ML LEIVA
Lugar:
CHETUMAL
Reunión:
Congreso; XXV Working Meeting CSG-UICN; 2022
Institución organizadora:
CSG
Resumen:
Caiman latirostris presents temperature sex determination (TSD). Most ofthe studies on TSD have been done under constant incubation temperature, but suchsituation does not occur in nature. In this work we evaluate the sex ratio of nestsincubated under fluctuating thermal daily cycles. We also evaluated if cycles affecthatching success, incubation period, and hatchling size. We set up four treatments, (a)15 hours at 31°C and 9 hours at 33°C; (b) 9 hours at 31°C and 15 hours at 33°C, and 24hours constant (c) 31°C and (d) 33°C. Sex ratio in treatment (a) was 77% females, (b) 23%females, and as expected (c) 100% females and (d) 100% males. Hatching success andmorphological parameters were not affected by cycling incubation temperature; onthe other hand, incubation period was shorter as incubation time at 33°C was longer.Analysis of females indicated that as incubation time at 33°C increased, females weresmaller; no relationship was found for males, suggesting a possible stress effect onlyfor females. Our results indicate that staying up to 40% of the day at male inducingtemperature compared to constant incubation at 31°C reduced female productionfrom 100% to 77% but staying about 60% of the time at male inducing temperaturesreduces female production to 23%.