Structural chromosome polymorphism in a Pimelodus maculatus La Cepède, 1803 population (Siluriformes, Pimelodidae) from the Paranapanema River basin, PR, Brazil

Brazilian Journal of Biology

J. Mazzuchelli²  Ac. Swarça¹  Al. Dias² 

[1] ,Universidade Estadual de Londrina Centro de Ciências Biológicas Departamento de Biologia GeralLondrina PR ,Brazil

关键词: Pimelodus;    Pimelodidae;    polymorphism;    cytotype;    Pimelodus;    Pimelodidae;    polimorfismo;    citótipo;   

DOI  :  10.1590/S1519-69842007000500018

来源: SciELO

【 摘 要 】

In the present cytogenetic study of Pimelodus maculatus, 13 specimens (8 males and 5 females) from the Congonhas Stream in Paraná State, Brazil, were examined using conventional staining. All of them showed a karyotype of 2n = 56, with a chromosome distribution of 20m + 20sm + 10st + 6a. However, four individuals (2 males and 2 females) were found to have a variant karyotype (cytotype) with two heteromorphic chromosomes in the group of submetacentric chromosomes - one of them corresponds to the second largest chromosome of this group and the other is a chromosome of small size. This variation suggests the existence of a structural polymorphism in the studied population.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License