Data/hora: 05/06/2024 06:37:54

Provedor de dados: | 36
País: | Brazil
Título: | Geological control of Podocnemis expansa and Podocnemis unifilis nesting areas in Rio Javaés, Bananal Island, Brazil
Autores: | Ferreira Júnior,Paulo Dias; Castro,Paulo de Tarso Amorim.
Data: | 2003-01-01
Ano: | 2003
Palavras-chave: | Podocnemis; Turtle; Sediment; Nesting place; Incubation duration.
Resumo: | The distribution of the nests of Podocnemis expansa (Amazon turtle) and Podocnemis unifilis (yellow-spotted side neck turtle) along the point bars of the Javaés River in Bananal Island, demonstrates a clear preference of these chelonians for differentiated geological environments, in respect to the morphology, grain size or height of the nests in relation to the level of the river. The topographical distribution and the differences in the grain size of the sediments that compose the point bars of the river, originated from the multiple sedimentary processes, and make possible the creation and separation of different nesting environments. Each turtle species takes advantage of the place that presents physiographic characteristics appropriate to the hatching success of their eggs. The superposition of the P. expansa and P. unifilis nest placement areas is rare. The P. expansa nests are concentrated on the central portion of the beaches where successive depositional sedimentary events produced sandy banks more than 3.3 m above the river water level. The P. unifilis nests are distributed preferentially in the upstream and downstream portions along the point bars where the sandy deposits rarely surpass 1.5 m at the moment of laying. P. expansa nests located on the beaches of fine to medium sized sand hatch in a mean of 68 days, while those incubated on beaches of medium to coarse sand size take a mean of 54 days to hatch.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000300010
Editor: | Instituto Nacional de Pesquisas da Amazônia
Relação: | 10.1590/S0044-59672003000300010
Formato: | text/html
Fonte: | Acta Amazonica  v.33 n.3 2003
Fonte: | info:eu-repo/semantics/openAccess