title: Comparative cytogenetics among populations of Astyanax altiparanae (Characiformes, Characidae, Incertae sedis).
abstract: Cytogenetic data are presented for Astyanax altiparanae populations from three Brazilian hydrographic systems. The chromosomal data obtained in A. altiparanae support the hypothesis of diploid number conservation. However, small differences in the karyotype formula and number of nucleolar organizer regions were observed in these populations. The apparent karyotypical similarity among the studied populations strongly suggests a close relationship among them with some chromosomal divergences due to gene flow restriction.
authors.affiliation: Laboratório de Citogenética, Departamento de Genética e Evolução, Universidade Federal de São Carlos, São Carlos, SP Brazil.
authors.forename: Maressa
authors.initials: M
authors.lastname: Ferreira
authors.forename: Marcelo Ricardo
authors.initials: MR
authors.lastname: Vicari
authors.forename: Edemar Furquim
authors.initials: EF
authors.lastname: de Camargo
authors.forename: Roberto Ferreira
authors.initials: RF
authors.lastname: Artoni
authors.forename: Orlando
authors.initials: O
authors.lastname: Moreira-Filho