Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, Brazil

Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, Brazil

The genus Astyanax is one of the most numerous of the family Characidae, comprising a large number of similar-shaped species, but displaying innumerable karyotypic variations in its chromosome number and/or structure. The literature describes A. fasciatus populations with diploid chromosome numbers varying from 2n = 45 to 2n = 48. In this study, A. fasciatus specimens captured in the Araguari River (Alto Paraná basin) were cytogenetically characterized, revealing a diploid chromosome number of 2n = 46. The nucleolar organizing regions (NORs), detected with silver nitrate staining, showed a multiple system with two pairs of marked chromosomes. These findings are congruent with those of other studies involving populations of the same species.

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Auteurs principaux: Torres-Mariano,A. R., Morelli,S.
Format: Digital revista
Langue:English
Publié: Instituto Internacional de Ecologia 2006
Accès en ligne:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842006000100020
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spelling oai:scielo:S1519-698420060001000202006-05-02Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, BrazilTorres-Mariano,A. R.Morelli,S. cytogenetics Astyanax Astyanax fasciatus The genus Astyanax is one of the most numerous of the family Characidae, comprising a large number of similar-shaped species, but displaying innumerable karyotypic variations in its chromosome number and/or structure. The literature describes A. fasciatus populations with diploid chromosome numbers varying from 2n = 45 to 2n = 48. In this study, A. fasciatus specimens captured in the Araguari River (Alto Paraná basin) were cytogenetically characterized, revealing a diploid chromosome number of 2n = 46. The nucleolar organizing regions (NORs), detected with silver nitrate staining, showed a multiple system with two pairs of marked chromosomes. These findings are congruent with those of other studies involving populations of the same species.info:eu-repo/semantics/openAccessInstituto Internacional de EcologiaBrazilian Journal of Biology v.66 n.1a 20062006-02-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842006000100020en10.1590/S1519-69842006000100020
institution SCIELO
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country Brasil
countrycode BR
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region America del Sur
libraryname SciELO
language English
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author Torres-Mariano,A. R.
Morelli,S.
spellingShingle Torres-Mariano,A. R.
Morelli,S.
Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, Brazil
author_facet Torres-Mariano,A. R.
Morelli,S.
author_sort Torres-Mariano,A. R.
title Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, Brazil
title_short Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, Brazil
title_full Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, Brazil
title_fullStr Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, Brazil
title_full_unstemmed Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, Brazil
title_sort chromosomal analysis of astyanax fasciatus (pisces, characidae) from the araguari river, uberlândia, mg, brazil
description The genus Astyanax is one of the most numerous of the family Characidae, comprising a large number of similar-shaped species, but displaying innumerable karyotypic variations in its chromosome number and/or structure. The literature describes A. fasciatus populations with diploid chromosome numbers varying from 2n = 45 to 2n = 48. In this study, A. fasciatus specimens captured in the Araguari River (Alto Paraná basin) were cytogenetically characterized, revealing a diploid chromosome number of 2n = 46. The nucleolar organizing regions (NORs), detected with silver nitrate staining, showed a multiple system with two pairs of marked chromosomes. These findings are congruent with those of other studies involving populations of the same species.
publisher Instituto Internacional de Ecologia
publishDate 2006
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842006000100020
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AT morellis chromosomalanalysisofastyanaxfasciatuspiscescharacidaefromthearaguaririveruberlandiamgbrazil
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