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

Genetics and Molecular Biology

Denise Corrêa Benzaquem²  Eliana Feldberg²  Jorge Ivan Rebelo Porto²  Maria Claudia Gross²  Jansen Alfredo Sampaio Zuanon¹ 

[1] ,, Instituto Nacional de Pesquisas da Amazônia Laboratório de Genética de Peixes Manaus AM ,Brazil

关键词: karyotype;    pike cichlid;    chromosome marker;    Amazon;   

DOI  :  10.1590/S1415-47572008000200016

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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