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Title: Karyotypic variability in Iheringichthys labrosus (Teleostei, Pimelodidae) from the Tibagi River basin (Paraná State, Brazil)
Authors: Braga Ribeiro, Leila
Matoso, D. A.
Almeida, Mara Cristina de
Vicari, Marcelo Ricardo
Moraes-Neto, Américo
Svidnicki, Maria Carolina Costa Melo
Artoni, Roberto Ferreira
Keywords: Chromosome Analysis
Chromosome Pairing
Controlled Study
River Basin
Supernumerary Chromosome
Iheringichthys Labrosus
Issue Date: 2008
metadata.dc.publisher.journal: Genetics and Molecular Research
metadata.dc.relation.ispartof: Volume 7, Número 3, Pags. 718-724
Abstract: Cytogenetic analyses were carried out in a populational sample of Iheringichthys labrosus from the Guaraúna River (Upper Tibagi River; Paraná State, Brazil) in order to provide a karyotypic comparison with another previously studied population from the Lower Tibagi River, characterized by the presence of 32m + 8sm + 6st + 10a (2n = 56, FN = 102) and occurrence of supernumerary chromosomes (80% of individuals). The 17 specimens of I. labrosus (6 females, 10 males and 1 of unknown sex) from the Upper Tibagi River showed 2n = 56 chromosomes, a karyotype formula of 14m + 32sm + 4st + 6a (FN = 106), without evidence of sex chromosome heteromorphism or supernumerary chromosomes. The heterochromatin was detected at telomeric and centromeric positions in several chromosomal pairs. The Ag-nucleolar organizer regions were heteromorphic and located at terminal position on short arms of the 16th chromosomal pair, suggesting a positive association with heterochromatic regions. The inter-populational karyotypic differentiation reported indicates distinct evolutionary pathways within I. labrosus in the Tibagi River basin. ©FUNPEC-RP.
metadata.dc.identifier.doi: 10.4238/vol7-3gmr456
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