Data/hora: 05/06/2024 17:11:12

Biblioteca(s): | Embrapa Pesca e Aquicultura.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | B - 1
Data corrente: | 08/01/2013
Data da última atualização: | 08/01/2013
Autoria: | ALVES, A. L.; BORBA, R. S. de; OLIVEIRA, C.; NIRCHIO, M.; GRANADO, A.; FORESTI, F.
Afiliação: | ANDERSON LUIS ALVES, CNPASA; RAFAEL SPLENDORE DE BORBA, UNESP Rio Claro-SP; CLAUDIO OLIVEIRA, UNESP Botucatu-SP; MAURO NIRCHIO, UNIVERSIDAD DE ORIENTE, Venezuela; ANGEL GRANADO, UNIVERSIDAD DE ORIENTE, Venezuela; FAUSTO FORESTI, UNESP Botucatu-SP.
Título: | Karyotypic diversity and evolutionary trends in the Neotropical catfish genus Hypostomus Lacépède, 1803 (Teleostei, Siluriformes, Loricariidae).
Ano de publicação: | 2012
Fonte/Imprenta: | Comparative Cytogenetics, Sofia, v. 6, n. 4, p. 443-452, 2012.
DOI: | doi: 10.3897/CompCytogen.v6i4.4028
Idioma: | Inglês
Conteúdo: | The family Loricariidae with 813 nominal species is one of the largest fish families of the world. Hypostominae, its more complex subfamily, was recently divided into five tribes. The tribe Hypostomini is composed of a single genus, Hypostomus Lacépède, 1803, which exhibits the largest karyotypic diversity in the family Loricariidae. With the main objective of contributing to a better understanding of the relationship and the patterns of evolution among the karyotypes of Hypostomus species, cytogenetic studies were conducted in six species of the genus from Brazil and Venezuela. The results show a great chromosome variety with diploid numbers ranging from 2n=68 to 2n=76, with a clear predominance of acrocentric chromosomes. The Ag-NORs are located in terminal position in all species analyzed. Three species have single Ag-NORs (Hypostomus albopunctatus (Regan, 1908), H. prope plecostomus (Linnaeus, 1758), and H. prope paulinus (Ihering, 1905)) and three have multiple Ag-NORs (H. ancistroides (Ihering, 1911), H. prope iheringi (Regan, 1908), and H. strigaticeps (Regan, 1908)). In the process of karyotype evolution of the group, the main type of chromosome rearrangements was possibly centric fissions, which may have been facilitated by the putative tetraploid origin of Hypostomus species. The relationship between the karyotype changes and the evolution in the genus is discussed.
Thesagro: | Cariotipo; Peixe.
Thesaurus Nal: | Fish; Karyotyping; Loricariidae; Polyploidy.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/73478/1/alves1.pdf
Registro original: | Embrapa Pesca e Aquicultura (CNPASA)
Exemplares: | CNPASA - (103-1) - UPC - AP - DD - CNPASA-SP48 -  - 2012.048 - DIS