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Chromosome Research

, Volume 8, Issue 7, pp 627–634 | Cite as

Frequency increase and mitotic stabilization of a B chromosome in the fish Prochilodus lineatus

  • Z. I. Cavallaro
  • L. A. C. Bertollo
  • F. Perfectti
  • J. P. M. Camacho
Article

Abstract

Six populations of the fish Prochilodus lineatus were analysed for B chromosome frequency. A study of spermatogenesis revealed the absence of B accumulation during the stages analysed. In one of the populations, from the Mogi-Guaçu river where samples have been analysed over a ten-year period, B chromosome frequency doubled between 1979–80 and 1987–89, whereas no additional changes were noticed in samples collected in 1991–92. The analysis of B chromosome mitotic instability, manifested by intraindividual variation in B chromosome number, indicated a very significant decrease during this time period. This suggests that, in the 1980s, this population was in the final stage of B chromosome invasion, and that there was a possible causal relationship between B mitotic instability and the accumulation mechanism that caused its frequency increase. Mitotic stabilization might thus be a way by which a mitotically unstable B chromosome may become neutralized.

B chromosome drive mitotic instability neutralization parasite chromosome Prochilodus lineatus 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Z. I. Cavallaro
    • 1
  • L. A. C. Bertollo
    • 1
  • F. Perfectti
    • 2
  • J. P. M. Camacho
    • 2
  1. 1.Depto. de Genética e EvoluçãoUniversidade Federal de São CarlosSão Carlos, SPBrazil
  2. 2.Departamento de GenéticaUniversidad de GranadaGranadaSpain

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