Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/2637
Título: The nesting of Crocodylus porosus in Arnhem Land, northern Australia.
Autor(es): G J W Webb
H Messel
William Ernest Magnusson
Assunto: jacaré
Crocodilia
reprodução
ISSN: 0045-8511
Revista: Copeia
Volume: 1977
Resumo: In northern Australia Crocodylus porosus nest between November and March, i.e. during the wet season. Mean distance between nests and permanent water was 7.8 m. Nests adjacent to more saline, lower reaches of rivers were in freshwater swamps, whereas further upstream they were beside the river. The nests are mounds, with mean dimensions: 53 cm high, 175 cm long and 157 cm wide, constructed of vegetation and mud, collected from a mean area of 47 m2. Beside the nest may be 1 to 4 wallows. Some nests are made in which no eggs are deposited. Mean number of eggs per nest was 50 (range 40 to 62). Variation in egg size between nests was far greater than that within any one nest. Mean egg length varied from 7.2 cm to 8.1 cm, egg width from 4.7 cm to 5.4 cm and egg weight from 91 gm to 132 gm. Flooding killed all embryos in 24 of 30 nests with eggs under study. Incubation temperature means ranged between 27.3 C and 31.4 C. Temperatures within a nest can be stable or fluctuate ± 3 C. Maximum temperatures may occur during the night. Incubation time was between 80 and 98 days. Predation on eggs was minimal. Survival rate of juveniles was high. Adult C. porosus, thought to be the females, remain next to the nest during incubation, excavate the nest when the young hatch, and remain with the hatchling group for up to 2½ months after hatching.
URI: http://repositorio.inpa.gov.br/handle/123/2637
ISSN: 0045-8511
DOI: http://dx.doi.org/10.2307/1443905
Local de publicação: Estados Unidos
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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