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      Cytogenetics analyses among populations of the fish Iheringichtys labrosus (Kröyer, 1874) (Siluriformes, Pimelodidae). Karyotype analysis, C- banding and AgRONs distribution Translated title: Análise citogenética entre populações de peixes Iheringichtys labrosus (Kröyer, 1874) (Siluriformes, Pimelodidae). Análise cariotípica, bandamento C e distribuição das AgRONs

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          Abstract

          Karyotypic data on Iheringichthys labrosus from several populations of Paraná River/Argentina are presented. The diploid number was 2n=56 and the karyotype consisted of 42m/sm + 14st/a (NF= 98). The AgNORs were observed in telomeres of the long arm of a st/a chromosome pair. These sites were also positive after C-banding. Heterochromatin was observed in the telomeric position in some chromosomal pairs and can be found in one or both metacentric chromosome arms. The obtained results were compared with those reported for different populations from Brazilian rivers and the similarity among them was evident. However, discordant chromosome formulae and karyotype features between samples should be carefully taken because, in some cases, they seem to be more technical artifacts than real differences.

          Translated abstract

          Dados cariotípicos de Iheringichthys labrosus de várias populações do Rio Paraná/Argentina são apresentados. O número diploide foi 2n=56 e o cariótipo constituído de 42m/sm + 14st/a (NF= 98). As AgNORs foram observadas telomericamente no braço longo de um par cromossômico st/a. Estes sítios também apresentaram bandas positivas após bandamento C. Heterocromatina foi observada em posição telomérica em alguns pares cromossômicos e podem ser encontradas em um ou ambos os braços de cromossomos metacêntricos. Os resultados obtidos foram comparados com aqueles reportados em diferentes populações de rios brasileiros e foi evidente uma similaridade entre eles. Entretanto, fórmulas cariotípicas discordantes e características cariotípicas entre exemplares deveriam ser cuidadosamente observadas porque, em alguns casos, eles parecem ser mais artefatos de técnica que diferenças reais.

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          Most cited references27

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          Chromosomal Evolution in North American Catfishes (Siluriformes: Ictaluridae) with Particular Emphasis on the Madtoms, Noturus

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            Cytogenetic studies on fishes of the family Pimelodidae (Siluroidei)

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              Cytogenetic Aspects in Species of the Genus Pimelodus(Pisces, Siluriformes, Pimelodidae) of the River Parana Basin.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                bjb
                Brazilian Journal of Biology
                Braz. J. Biol.
                Instituto Internacional de Ecologia (São Carlos )
                1678-4375
                February 2014
                : 74
                : 1
                : 212-216
                Affiliations
                [1 ] Universidad Nacional del Nordeste Argentina
                [2 ] Universidade Estadual de Londrina Brazil
                [3 ] Universidad Nacional de Misiones Argentina
                Article
                S1519-69842014000100026
                10.1590/1519-6984.13212
                926280b4-7549-4002-83ea-70e68a60e54a

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1519-6984&lng=en
                Categories
                BIOLOGY

                General life sciences
                Pimelodidae,I. labrosus,karyotype conservatism,conservantismo cariotípico

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