Consulta: subjectFacets:"Podocnemis"
Registros recuperados: 3
Data/hora: 09/06/2024 03:52:02

Low genetic variability in the endangered Colombian endemic freshwater turtle Podocnemis lewyana (Testudines, Podocnemididae)
Provedor de dados: 16
Autores: Vargas-Ramírez, M.; Chiari, Y.; Castaño-Mora, O.V.; Menken, S.B.J.
The Magdalena River Turtle (Podocnemis lewyana) is a Colombian endemic species, endangered due to human exploitation and habitat destruction. To date, this species is poorly known ecologically and data on its genetic diversity are lacking. Here we report on the first genetic survey of the species across its distribution range. We obtained mitochondrial DNA sequences (488 bp) of the cytochrome b gene from 109 individuals. Samples belong to populations located at several different localities, grouped in five regions, along the four main river basins: Magdalena, Cauca, San Jorge, and Sinú drainages. We found two haplotypes, which differ in only one nucleotide substitution and which are represented with different frequencies in the five geographic regions....
Tipo: Article / Letter to the editor
Palavras-chave: Reptilia; Genetic population structure; Cytochrome b; MtDNA; Podocnemis; 42.82.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/217421

Comportamento e preferência alimentar em Podocnemis expansa (Schweigger), P. unifilis (Troschel) e P. sextuberculata (Cornalia) em cativeiro (Testudines, Pelomedusidae)
Provedor de dados: 104
Autores: Malvasio,Adriana; Souza,Ana Maria de; Molina,Flavio de Barros; Sampaio,Francisco de Arruda.
The feeding behavior and the food preference was studied in P. expansa (Schweigger, 1812) P. unifilis (Troschel, 1848) and P. sextuberculata (Cornalia, 1849). The method used for feeding behavior and food preference was the sampling of all occurrences. The Students' t test was applied on the food items, to compare differences during the development of each species. The main conclusions are: feeding behavior for food, except alive animals, is divided in foraging, approach, olfactory recognition, capture, laceration and ingestion; the persecution behavior was observed for prey activity; cleptoparasitism occurs in the three species and neustophagia mechanism was detected in P. unifilis; P. sextuberculata shows to be almost only carnivorous and P. expansa and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Captivity; Food behavior; Food preference; Podocnemis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000100021

Geological control of Podocnemis expansa and Podocnemis unifilis nesting areas in Rio Javaés, Bananal Island, Brazil
Provedor de dados: 36
Autores: Ferreira Júnior,Paulo Dias; Castro,Paulo de Tarso Amorim.
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...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Podocnemis; Turtle; Sediment; Nesting place; Incubation duration.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000300010