Cytogenetics Studies inTwo Populations of Astyanax scabripinnis with 2n=48 Chromosomes (Teleostei, Characidae)

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Author(s)

Abstract

Cytogenetic analysis in 2 populations of Astyanax scabripinnis from São Domingos and Tamboara streams, affluents of the Ivai river basin, was carried out. Both populations presented same diploid of 2n=48 chromosomes, although they might be differentiated by karyotypic formulae (10M, 20SM, 8ST, 10A and 10M, 24SM, 6ST, 8A, respectively) and number of nucleolar organizer chromosomes (3 and 7 NORs, respectively). Besides the population from São Domingos showed 1 metacentric B microchromosome restricted to females. Low frequency of this B microchromosome suggets a recent origin in populations of Astyanax scabripinnis and its adaptive function remains unknown. Aspects related to karyotype diversity of this “species complex” are discussed, contributing to the understanding of the mechanisms involved in the diversity and speciation on the group.

Journal

  • CYTOLOGIA

    CYTOLOGIA 67(2), 117-122, 2002-06-25

    Japan Mendel Society, International Society of Cytology

References:  20

Cited by:  3

Codes

  • NII Article ID (NAID)
    10008840421
  • NII NACSIS-CAT ID (NCID)
    AA00622764
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00114545
  • Data Source
    CJP  CJPref  J-STAGE 
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