High Genetic Diversity despite Conserved Karyotype Organization in the Giant Trahiras from Genus Hoplias (Characiformes, Erythrinidae).

摘要: In the fish genus Hoplias, two major general groups can be found, one of which is formed by "common trahiras" (Hoplias malabaricus group) and other "giant lacerdae group, in addition to Hoplias aimara), usually comprises specimens larger body size. Previous investigations from giant trahiras group recovered 2n = 50 meta/submetacentric chromosomes no sex chromosome differentiation, indicating a probable conservative pattern for their karyotype organization. Here, we conducted comparative cytogenetic studies six species, them first time. We employed standard advanced molecular cytogenetics procedures, including genomic hybridization (CGH), as well assessments diversity levels phylogenetic relationships among them. The results strongly suggest that have particular differentiated evolutionary pathway inside genus. While these species share same karyotypes, congeneric H. show notable chromosomal number, morphology, systems. However, at time, significant changes were characterized inner level, genetic diversity, highlighting current resulting different histories.