Cytotaxonomy and karyoevolution of the genus Crenicichla (Perciformes, Cichlidae)

• Autor(a) principal: Benzequem, Denise Corrêa
• Data de Publicação: 2008
• Outros Autores: Feldberg, Eliana, Porto, Jorge Ivan Rebelo, Gross, Maria Claudia, Zuanon, Jansen
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional do INPA
• Texto Completo: https://repositorio.inpa.gov.br/handle/1/14957
• topic: C Banding; Chromosomal Localization; Chromosome Analysis; Chromosome Marker; Chromosome Nor; Chromosome Pairing; Cichlid; Cistron; Constitutive Heterochromatin; Controlled Study; Crenicichla; Crenicichla Britskii; Crenicichla Cincta; Crenicichla Inpa; Crenicichla Johanna; Crenicichla Lugubris; Crenicichla Reticulata; Cytotaxonomy; Female; Fish Genetics; Karyotype; Male; Evolution, Molecular; Nonhuman; Perciformes; River; Species Comparison; Species Difference; Cichlidae; Crenicara; Crenicichla; Crenicichla Lugubris; Perciformes

Karyotypes of six cichlid species of the genus Crenicichla were investigated. The species C. cincta, C. inpa, C. reticulata, C. lugubris, and C. cf. johanna were collected from Amazon basin, and C. britskii was collected from the Paraná-Paraguai basin. All of the analysed species showed 2n = 48 chromosomes; however, C. cincta, C. lugubris, C. cf. johanna, and C. britskii had a karyotype formula of 8M-SM+40ST-A, FN = 56, while C. inpa and C. reticulata exhibited the formula 6M-SM+42ST-A, FN = 54. Analysis of active Ag-NORs revealed two NOR-bearing chromosomes in all species; however, theses cistrons were located on different chromosome pairs and/or in different chromosome locations in each species. This condition bears evolutionary significance, since it is the main chromosome marker of the process of karyotypic evolution among the species of the genus Crenicichla. In general, C-banding revealed a similar constitutive heterochromatin pattern in all species, although it was possible to detect some features that led us to infer that Crenicichla also presents a species-specific heterochromatin pattern. Copyright © 2008, Sociedade Brasileira de Genética.