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• W2021497648 abstract "Among catfish species of the genus Rhamdia reported for the Brazilian territory, R. quelen is the most widespread, being found in nearly all hydrographic basins of Brazil. Nowadays, R. quelen is a synonym for at least 47 other species in this genus, its taxonomic status still being controversial. The available cytogenetic reports show a wide variation in the karyotypic macrostructure, with the frequent presence of supernumerary chromosomes. The remarkable cytogenetic variability associated with taxonomic issues in this species indicates that R. quelen is actually a species complex. In order to carry out a wide comparative cytogenetic study in R. quelen from southern and southeastern Brazil and examine a species complex, we analyzed the chromosomes of 14 populations from the main hydrographic basins of these two regions. Using classic and molecular cytogenetic techniques, we found seven distinct karyotypic formulae, all bearing 2n = 58 chromosomes. Supernumerary chromosomes were present in most of the populations; their number, size and C-banding pattern allowed us to differentiate populations with similar karyotypic compositions. We examined patterns of chromosomal evolution as well as the probable mechanisms involved in the origin and morphological differentiation of their supernumerary chromosomes." @default.
• W2021497648 created "2016-06-24" @default.
• W2021497648 creator A5015268908 @default.
• W2021497648 creator A5025964427 @default.
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• W2021497648 date "2010-01-01" @default.
• W2021497648 modified "2023-09-28" @default.
• W2021497648 title "Karyotypic evolution trends in Rhamdia quelen (Siluriformes, Heptapteridae) with considerations about the origin and differentiation of its supernumerary chromosomes" @default.
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• W2021497648 doi "https://doi.org/10.4238/vol9-1gmr750" @default.
• W2021497648 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20309823" @default.
• W2021497648 hasPublicationYear "2010" @default.
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