Karyological characterization of Mugil trichodon Poey, 1876 (Pisces: Mugilidae)

Authors

  • Mauro Nirchio Escuela de Ciencias Aplicadas del Mar, Universidad de Oriente
  • Ernesto Ron Escuela de Ciencias Aplicadas del Mar, Universidad de Oriente
  • Anna Rita Rosi Dipartimento di Biologia Animale e dell'Uomo, Università di Roma "La Sapienza"

DOI:

https://doi.org/10.3989/scimar.2005.69n4525

Keywords:

karyotype, NOR, C-banding, Mugil trichodon

Abstract


Cytogenetic studies were conducted on Mugil trichodon from Margarita Island, Venezuela. The species showed a karyotype 2n=48 with entirely acrocentric chromosomes (Arm number, NF=48). Chromosomes gradually decreased in size and did not allow a clear distinction of homologues, except for one marker pair, which showed a conspicuous secondary constriction. C-banding showed heterochromatic blocks restricted at the centromeric regions of all the chromosomes. Some were more obvious than others, with the exception of the chromosome pair that had a secondary constriction with entirely heterochromatic short arms. Sequential staining with Giemsa and AgNO3 demonstrated the conspicuous secondary constrictions corresponding to the NORs, and these had significant intraindividual size variations between both homologous chromosomes. The data obtained here support the contention that Mugilidae have a conservative chromosome macrostructure and reinforce the hypothesis that small structural chromosome rearrangements involving active NOR sites are the main cause of the karyotypic diversification seen in this group.

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Published

2005-12-30

How to Cite

1.
Nirchio M, Ron E, Rosi AR. Karyological characterization of Mugil trichodon Poey, 1876 (Pisces: Mugilidae). scimar [Internet]. 2005Dec.30 [cited 2022Aug.10];69(4):525-30. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/281

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