Karyological evidence for interspecific hybridization between Cichla monoculus and C. temensis (Perciformes, Cichlidae) in the Amazon
Cichla monoculus, Cichla temensis (peacock bass or tucunaré), and its presumed hybrids, were cytogenetically analyzed. The fish were collected at three distinct sites in the central Amazon basin, namely in the Uatumã (C. monoculus, C. temensis and their natural hybrid), Jaú (C. temensis), and Solimõ...
| Autores: | , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2004 |
| País: | Brasil |
| Recursos: | Instituto Nacional de Pesquisas da Amazônia (INPA) |
| Repositorio: | Repositório Institucional do INPA |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio:1/16390 |
| Acesso em linha: | https://repositorio.inpa.gov.br/handle/1/16390 |
| Access Level: | acceso abierto |
| Palavra-chave: | Acrocentric Chromosome Bass Brasil C Banding Centromere Chromosome Analysis Chromosome Arm Chromosome Nor Chromosome Number Chromosome Pairing Chromosome Size Chromosome Structure Constitutive Heterochromatin Controlled Study Diploidy Fish Genetics Hybrid Interspecific Hybridization Nonhuman River Species Differentiation Animal Chromosomes Cichlids Female Heterochromatin Hybridization, Genetic Karyotyping Male Nucleolus Organizer Region Bairdiella Ronchus Cichla Monoculus Cichla Temensis Cichlidae Perciformes |
| Resumo: | Cichla monoculus, Cichla temensis (peacock bass or tucunaré), and its presumed hybrids, were cytogenetically analyzed. The fish were collected at three distinct sites in the central Amazon basin, namely in the Uatumã (C. monoculus, C. temensis and their natural hybrid), Jaú (C. temensis), and Solimões rivers (C. monoculus). The two species and the natural hybrid showed the same diploid number, 2n=48 acrocentric chromosomes. Single NORs were detected in the distal region of the long arm in all three species. However, in C. monoculus, the NOR was found on the second pair of the complement, in C. temensis, on the third pair and in the hybrid two NOR patterns were found, one on the second pair and the other on the third pair of chromosomes. The two species and the hybrid have their constitutive heterochromatin located in the pericentromeric region of all chromosomes and an interstitial C-band located on the largest chromosome pair. The great similarity in the chromosome number and morphology, chromosome size class differences, the NOR patterns and C-banding suggested chromosomal stasis during speciation and hybridization of Cichla. |
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