, Volume 125, Issue 1, pp 27–32 | Cite as

Comparative Molecular Cytogenetic Analysis of Two Congeneric Species, Mugil Curema and M. Liza (Pisces, Mugiliformes), Characterized by Significant Karyotype Diversity

  • A. R. Rossi
  • E. Gornung
  • L. Sola
  • M. Nirchio


Two congeneric mullet species, Mugil liza and M. curema, respectively with an all-uniarmed and an all-biarmed karyotype, were cytogenetically studied by base-specific fluorochrome staining and FISH-mapping of 45S and 5S ribosomal RNA genes (rDNA) and the (TTAGGG) n telomeric repeats. Whereas 45S rDNA sites might be homeologus in the two species, 5S rDNA sites are not, as they are localized on chromosome arms of different size. In both species, the (TTAGGG) n telomeric probe hybridized to natural telomeres and was found scattered along the NORs. In metacentric chromosomes of M. curema, no pericentromeric signals of the telomeric probe were detected. Data are discussed in relation to the karyotype evolution in Mugilidae and to the mechanisms and the evolutionary implications of Robertsonian rearrangements in M. curema.

Key words

Mugil Mugilidae NORs 5S rDNA Robertsonian fusion telomeric sequences 


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Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Department of Animal and Human BiologyUniversity of Rome I “La Sapienza”RomeItaly
  2. 2.Escuela de Ciencias Aplicadas del Mar.Universidad de OrienteIsla de MargaritaVenezuela

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