Chromosomal diversity in three species of electric fish (Apteronotidae, Gymnotiformes) from the Amazon Basin

Cytogenetic studies were carried out on samples of Parapteronotus hasemani, Sternarchogiton preto and Sternarchorhamphus muelleri (Apteronotidae, Gymnotiformes) from the Amazon basin. The first two species exhibited both a 2n = 52 karyotype, but differed in their karyotypic formulae, distribution of constitutive heterochromatin, and chromosomal location of the NOR. The third species, Sternarchorhamphus muelleri, was found to have a 2n = 32 karyotype. In all three species the DAPI and chromomycin A3 staining results were consistent with the C-banding results and nucleolar organizer region (NOR) localization. The 18S rDNA probe confirmed that there was only one pair of ribosomal DNA cistron bearers per species. The telomeric probe did not reveal interstitial telomeric sequences (ITS). The karyotypic differences among these species can be used for taxonomic identification. These data will be useful in future studies of these fishes and help understanding the phylogenetic relationships and chromosomal evolution of the Apteronotidae.

Bibliographic Details

Main Authors:	Silva,Fernando Henrique Ramos, Pieczarka,Julio Cesar, Cardoso,Adauto Lima, Silva,Patrícia Corrêa da, Oliveira,Jonas Alves de, Nagamachi,Cleusa Yoshiko
Format:	Digital revista
Language:	English
Published:	Sociedade Brasileira de Genética 2014
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000500006
Tags:	Add Tag No Tags, Be the first to tag this record!