, Volume 72, Issue 6, pp 680–685 | Cite as

Chromosomal characteristics of rDNA in a conserved karyotype of two Sternopygus macrurus (Gymnotiformes: Sternopygidae) populations from upper Paraná River basin

  • Carlos Alexandre FernandesEmail author
  • Lucas Baumgärtner
  • Leonardo Marcel Paiz
  • Vladimir Pavan Margarido
  • Ana Luiza de Brito Portela-Castro
Section Zoology


Karyotype and chromosomal characteristics of both minor and major rDNA of Sternopygus macrurus, a weakly electric South American fish, from two populations of the upper Paraná River basin, were investigated using conventional (Giemsa staining, silver staining, C-banding and base-specific fluorochromes) and molecular (fluorescent in situ hybridization (FISH) with 5S and 18S rDNA probes) cytogenetic techniques. Diploid chromosome number was invariably 2n = 46 and karyotype composed of 23 pairs of biarmed chromosomes (28m+18sm). The nucleolus organizer regions (NORs) were located in the secondary constriction of the p arm of pair No. 2; this site corresponded with CMA3 positive as well as with 18S rDNA signals, respectively. This 18S rDNA cluster was not syntenic to the 5S rDNA sites located at pairs Nos. 1, 5 and 15. The karyotypes and other chromosomal characteristics of individuals from the two populations in the upper Paraná River basin were identical. The karyotype differences among individuals identified as S. macrurus from Paraná River and the S˜ao Francisco and Amazon River basins, respectively, may indicate that these taxa might represent distinct species.

Key words

fish cytogenetics chromosome banding NORs repeitive sequences Neotropical fishes 


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Copyright information

© Slovak Academy of Sciences 2017

Authors and Affiliations

  • Carlos Alexandre Fernandes
    • 1
    Email author
  • Lucas Baumgärtner
    • 2
  • Leonardo Marcel Paiz
    • 2
    • 3
  • Vladimir Pavan Margarido
    • 2
    • 3
  • Ana Luiza de Brito Portela-Castro
    • 4
  1. 1.Unidade Universitária de Mundo NovoUniversidade Estadual de Mato Grosso do SulMundo Novo, Mato Grosso do SulBrazil
  2. 2.Centro de Cięencias Biológicas e da SaúdeUniversidade Estadual do Oeste do ParanáCascavel, ParanáBrazil
  3. 3.Centro de Cięencias BiológicasUniversidade Estadual de MaringáMaringá, ParanáBrazil
  4. 4.Departamento de Biotecnologia, Genética e Biologia CelularUniversidade Estadual de MaringáMaringá, ParanáBrazil

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