Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, Brazil
Cytogenetic studies were performed on two sympatric species of Characidium, C. gomesi and C. cf. zebra, from the Grande River basin, Minas Gerais State, Brazil. Although both species had a chromosome number of 50 with a karyotype exclusively consisting of meta- and submetacentric chromosomes, inters...
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| Format: | Article |
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Sociedade Brasileira de Genética
2006-01-01
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| Series: | Genetics and Molecular Biology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300010 |
| _version_ | 1828885678211989504 |
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| author | Alexandre Rodrigues da Silva Edson Luis Maistro |
| author_facet | Alexandre Rodrigues da Silva Edson Luis Maistro |
| author_sort | Alexandre Rodrigues da Silva |
| collection | DOAJ |
| description | Cytogenetic studies were performed on two sympatric species of Characidium, C. gomesi and C. cf. zebra, from the Grande River basin, Minas Gerais State, Brazil. Although both species had a chromosome number of 50 with a karyotype exclusively consisting of meta- and submetacentric chromosomes, interspecific diversity was detected concerning the size of the two first chromosome pairs of the karyotypes. Active nucleolus organizer regions (NORs) were located at the terminal position on the long arm of the 17th pair of C. gomesi and at subterminal position on the long arm of the 23rd pair of C. cf. zebra. For both species the fluorochrome CMA3 stained only the NOR-bearing pair of chromosomes. The heterochromatin pattern also showed some differentiation between these species restricted to the centromeric or pericentromeric region of C. cf. zebra and practically absent in C. gomesi. These data are discussed concerning chromosome diversification in this fish group. |
| first_indexed | 2024-12-13T11:30:57Z |
| format | Article |
| id | doaj.art-d8044b8061aa41eea248184ca7c6c0fc |
| institution | Directory Open Access Journal |
| issn | 1415-4757 1678-4685 |
| language | English |
| last_indexed | 2024-12-13T11:30:57Z |
| publishDate | 2006-01-01 |
| publisher | Sociedade Brasileira de Genética |
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| series | Genetics and Molecular Biology |
| spelling | doaj.art-d8044b8061aa41eea248184ca7c6c0fc2022-12-21T23:47:57ZengSociedade Brasileira de GenéticaGenetics and Molecular Biology1415-47571678-46852006-01-0129345946310.1590/S1415-47572006000300010Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, BrazilAlexandre Rodrigues da SilvaEdson Luis MaistroCytogenetic studies were performed on two sympatric species of Characidium, C. gomesi and C. cf. zebra, from the Grande River basin, Minas Gerais State, Brazil. Although both species had a chromosome number of 50 with a karyotype exclusively consisting of meta- and submetacentric chromosomes, interspecific diversity was detected concerning the size of the two first chromosome pairs of the karyotypes. Active nucleolus organizer regions (NORs) were located at the terminal position on the long arm of the 17th pair of C. gomesi and at subterminal position on the long arm of the 23rd pair of C. cf. zebra. For both species the fluorochrome CMA3 stained only the NOR-bearing pair of chromosomes. The heterochromatin pattern also showed some differentiation between these species restricted to the centromeric or pericentromeric region of C. cf. zebra and practically absent in C. gomesi. These data are discussed concerning chromosome diversification in this fish group.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300010Characidium gomesiCharacidium cf. zebraCrenuchidaeNOR-bandingC-banding |
| spellingShingle | Alexandre Rodrigues da Silva Edson Luis Maistro Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, Brazil Genetics and Molecular Biology Characidium gomesi Characidium cf. zebra Crenuchidae NOR-banding C-banding |
| title | Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, Brazil |
| title_full | Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, Brazil |
| title_fullStr | Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, Brazil |
| title_full_unstemmed | Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, Brazil |
| title_short | Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, Brazil |
| title_sort | cytogenetic divergence between two sympatric species of characidium teleostei characiformes crenuchidae from the machado river minas gerais brazil |
| topic | Characidium gomesi Characidium cf. zebra Crenuchidae NOR-banding C-banding |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300010 |
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