5 documents found, page 1 of 1
Comparative Cytogenetics Among Three Sympatric Hypostomus Species (Siluriformes...
Lorscheider,Carla Andreia; Oliveira,Jordana Inácio Nascimento; Dulz,Thais Aparecida; Nogaroto,Viviane; Martins-Santos,Isabel CristinaABSTRACT The karyotypes of three armored catfish species (Loricariidae) from the Iguaçu river, southern of the Brazil, were compared using different techniques: C-banding, Ag-NOR and fluorescence in situ hybridization (FISH), which used 5S and 18S rDNAs and total Cot-1 fraction as probes. Hypostomus commersoni and Hypostomus derbyi presented 2n = 68 chromosomes, with karyotype formulae 12m+12sm+14st+30a and 12m...
B chromosome and NORs polymorphism in Callichthys callichthys (Linnaeus, 1758) ...
Konerat,Jocicléia Thums; Bueno,Vanessa; Baumgartner,Lucas; Martins-Santos,Isabel Cristina; Margarido,Vladimir PavanB chromosomes are extra chromosomes from the normal chromosomal set, found in different organisms, highlighting their presence on the group of fishes. Callichthys callichthys from the upper Paraná River has a diploid number of 56 chromosomes (26 m-sm + 30 st-a) for both sexes, with the presence of a sporadically acrocentric B chromosome. Moreover, one individual presented a diploid number of 57 chromosomes, wit...
Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characida...
Rosa,Renata da; Rubert,Marceléia; Malabarba,Luiz R.; Martins-Santos,Isabel Cristina; Giuliano-Caetano,LuciaThe genus Astyanax is prominent among Characiformes, due to the large number of species found and its wide geographic distribution. In this work, Astyanax laticeps specimens from the laguna dos Patos system were cytogenetically analyzed. A diploid number of 2n = 50 chromosomes distributed into 6m+16sm+16st+12a (FN = 88) was found, without differences between males and females. A few small heterochromatin blocks...
Mapping of the 18S and 5S ribosomal RNA genes in Astyanax altiparanae Garutti &...
Fernandes,Carlos Alexandre; Martins-Santos,Isabel CristinaFluorescence in situ hybridization (FISH) was undertaken in order to determinate the chromosomal distribution pattern of 18S and 5S ribosomal DNAs (rDNA) in four populations of the characid fish Astyanax altiparanae from the upper Paraná river basin, Brazil. The 18S rDNA probe FISH revealed numerical and positional variations among specimens from the Keçaba stream compared to specimens of the other populations ...
Cytogenetic and morphometric differences in populations of Astyanax "scabripinn...
Mizoguchi,Sônia Maria Hiromi Nakagawa; Martins-Santos,Isabel CristinaA cytogenetic and morphometric study of four populations of characid fish assigned to the "complex" of Astyanax scabripinnis originating from three riverine basins, namely Ivaí (populations A and B), Paranapanema (C) and Paraná (D), was carried out. Karyological analysis showed the diploid chromosome number 2n = 48 for population B and 2n = 50 for the remaining populations. All populations under study differed ...