Consulta: creatorFacets:"Torres,Rodrigo A."
Registros recuperados: 2
Data/hora: 16/06/2024 20:12:42

Cytotaxonomic diagnosis of Trichomycterus diabolus (Teleostei: Trichomycteridae) with comments about its evolutionary relationships with co-generic species
Provedor de dados: 83
Autores: Torres,Rodrigo A.; Oliveira,Claudio; Foresti,Fausto.
The karyotype and the Ag-NOR location of a sample of Trichomycterus diabolus collected in the córrego Hortelã (Botucatu, São Paulo, Brazil) are described. The species exhibited 2n=56 chromosomes (42 metacentrics, 12 submetacentrics and 2 subtelocentrics) and the nucleolus organizing region located near to the centromere on the long arm of the largest metacentric pair. The presence of 2n=56 chromosomes in T. diabolus is an interesting characteristic since until now all cis-Andean species karyotyped presented 2n=54 chromosomes while almost all trans-Andean species presented different diploid numbers. The possible origin of this unexpected karyotypic form is discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichomycterinae; Karyotype; Chromosome evolution; Fish cytogenetic.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000300003

Molecular taxonomy of Plagioscion Heckel (Perciformes, Sciaenidae) and evidence from mtDNA RFLP markers for an invasive species in the Paraná river, Southern Brazil
Provedor de dados: 104
Autores: Torres,Rodrigo A.
Mitochondrial RFLP markers were developed to examine whether Plagioscion squamosissimus (Heckel, 1840) is invasive in natural environments of the congener P. ternetzi in the Paraná river, in southern Brazil. Specimens of P. squamosissimus and of the putative P. ternetzi (Boulenger, 1895) were obtained from the Negro river (Manaus, Amazonas, Brazil) and from Paraná river, respectively. Fragments of the cytochrome b gene (900bp) were amplified by PCR and four restriction enzymes (Eco RI, Mbo I, Bam HI and Alu I) yielded the mitochondrial markers. An additional RFLP analysis with a cytochrome b gene sequence of Plagioncion sp. from GeneBank was carried out to validate the prior analysis. No genetic differentiation was found among either sample. While...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plagioscion squamosissimus; Cytochrome b; Genetic identity; Biological invasions.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000400034