Dissertação
Predação de ninhos da tartaruga tigre-d.água, Trachemys dorbigni (Duméril & Bibron, 1835) (Emydidae), no extremo sul do Brasil
Fecha
2007-02-16Autor
Gonçalves, Fernanda Anziliero
Institución
Resumen
Nests of the Brazilian slider turtle, Trachemys dorbigni, were monitored to
evaluate predation rates and the variation in time on these rates; to identify predator
species and its importance to nest destruction; and to determine the influence of nest
dispersion on predation, in Southern Brazil. From 58 monitored nests, 98 % (n = 57)
were destroyed by predators. Using camera traps and direct observations six species
of nest predators were registered: Tupinambis merianae, Caracara plancus,
Cerdocyon thous, Lycalopex gymnocercus, Conepatus chinga and Euphractus
sexcinctus. Predation events occurred predominantly in the first 48 hours after
oviposition. Nests constructed along all egg laying period had the same chance of
being depredated. There was not prevalence of any predator. Nest density did not
influence predation rate. There was no correlation between nest density and
predation rates, but there was a negative correlation between time after egg laying
and predation.