Karyotypic variability in Iheringichthys labrosus (Teleostei, Pimelodidae) from the Tibagi River basin (Parana State, Brazil)

被引：11
|
作者：
Ribeiro, L. B. [3 ]
Matoso, D. A. [2 ]
Almeida, M. C. [1 ]
Vicari, M. R. [1 ]
Moraes-Neto, A. [1 ]
Svidnicki, M. C. C. M. [1 ]
Artoni, R. F. [1 ]
机构：
[1] Univ Estadual Ponta Grossa, Dept Biol Estrutural Mol & Genet, Ponta Grossa, PR, Brazil
[2] Univ Fed Parana, Ctr Politecn, Programa Posgraduacao Genet, BR-80060000 Curitiba, Parana, Brazil
[3] Inst Nacl de Pesquisas da Amazonia, Programa Posgraduacao Genet Conservacao & Biol Ev, Manaus, Amazonas, Brazil
来源：
GENETICS AND MOLECULAR RESEARCH | 2008年 / 7卷 / 03期
关键词：
Karyotypic evolution; Cytotaxonomy; Heterochromatin; Ag-nucleolar organizer regions;
D O I：
10.4238/vol7-3gmr456
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Cytogenetic analyses were carried out in a populational sample of Iheringichthys labrosus from the Guara na River (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.Upper Tibagi River; Parana 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
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页码：718 / 724
页数：7
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