Comparative cytogenetics of Hoplias malabaricus (Pisces, Erythrinidae): a population analysis in adjacent hydrographic basins

Genetics and Molecular Biology

Marcelo Ricardo Vicari²  Roberto Ferreira Artoni¹  Luiz Antonio Carlos Bertollo² 

[1] ,Universidade Federal de São Carlos Departamento de Genética e Evolução Laboratório de CitogenéticaSão Carlos SP ,Brazil

关键词: chromosome banding;    FISH;    cytotaxonomy of trahiras;    karyotype;    NOR phenotype;   

DOI  :  10.1590/S1415-47572005000100018

来源: SciELO

【 摘 要 】

The chromosomes of specimens from four Hoplias malabaricus populations from headwaters of adjacent river basins at Ponta Grossa, southern Brazil, were investigated using differential staining techniques (C-banding, AgNO3 and CMA3) and fluorescent in situ hybridization (FISH) with an 18S rDNA probe. The diploid chromosome number in representatives of all four populations was invariably 2n = 42, with karyotypes composed of 12 pairs of metacentrics and 9 pairs of submetacentrics, without heteromorphic sex chromosomes. This kind of karyotype represents cytotype A in regard to cytotypes identified previously in H. malabaricus, exhibiting however, at the same time, some differences in the distribution of constitutive heterochromatin segments and in the locations of nucleolus organizer regions (NORs). The apparent karyotype similarity strongly suggests a close kinship among the studied populations, but the small differences detected in the examined chromosomal markers indicate some evolutionary divergence due to gene flow restriction among them.

【 授权许可】

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