Consulta: subjectFacets:"Genetic population structure"
Registros recuperados: 2
Data/hora: 09/06/2024 11:38:14

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

Genetic structure of Brazilian populations of white mouth croaker Micropogonias furnieri (Perciformes : Sciaenidae)
Provedor de dados: 52
Autores: Puchnick-Legat,Angela; Levy,José Alberto.
Mitochondrial (mt) DNA population structure was examined by using restriction fragment length polymorphism analysis (RFLP) among 149 white mouth croakers (Micropogonias furnieri) sampled from six locations in the Brazilian coast. Heterogeneity tests revealed no differentiation in mtDNA haplotype frequencies within the region between 23°S and 34°S (P=0.263), but significant heterogeneity was detected between north and south of 23°S (P&lt;0.003). Analysis of molecular variance (AMOVA) indicated a low F ST value (0.008, P=0.180) among south-central localities (23-34°S), but a significant level of population subdivision (F ST = 0.322, P&lt; 0.003) between north and south-central localities. UPGMA analysis of mtDNA sequence divergence revealed differentiation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic population structure; Mitochondrial DNA; RFLP; Micropogonias furnieri.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000400011