文獻來源: Pazza R., Kavalco S. A. F., Penteado P. R., Kavalco K. F., De almeida-toledo L. F.:2008. The species complex Astyanax fasciatus Cuvier (Teleostei, Characiformes) – a multidisciplinary approach. Journal of Fish Biology 72(8): DOI: 10.1111/j.1095-8649.2008.01837.xABSTRACT
Cytogenetic data have provided important clues that the Astyanax fasciatus populations from the Upper Paraná River basin could be a part of a more diverse fish group, usually included on the same taxa. Samples collected in Cachoeira de Emas, SP, in Mogi-Guaçu River basin, show two major cytotypes presenting 2n = 46 and 2n = 48 chromosomes, with distinct karyotypic formula, despite the fact that the molecular data suggested some degree of gene flow between these cytotypes. Cytogenetic and morphometric analyses were performed in this species, aiming to contribute to the understanding of the natural history from such fish group. Two allopatric populations with distinct standard cytotypes were analysed, and the data obtained suggest the separation into two groups.
圖片連結: aquarium.ru
