Karyological characterization of four Neotropical fish species of the genus Hisonotus ( Teleostei, Loricariidae, Hypoptopomatinae ) from distinct Brazilian river basins
Genet. mol. biol
; 29(1): 62-66, 2006. ilus, mapas
Article
em En
| LILACS
| ID: lil-424737
Biblioteca responsável:
BR26.1
ABSTRACT
The karyotypes of four Hisonotus species (two provisionally-named species A and D, H. nigricauda, and H. leucofrenatus) were found to have the same diploid number of 2n = 54 and interstitial silver-staining nucleolus organizer regions (Ag-NORs) located on the long arm of the largest metacentric pair. The C-banding pattern appeared to be species-specific, with one group (H. nigricauda and the unnamed species A and D) being characterized by small amounts of positive C-banded segments and containing a sub-group (species A and D) identified by a large positive C-banded segment on a small metacentric chromosome pair. The second group contained different samples of H. leucofrenatus, characterized by a larger amount of C-band positive segments spread over several chromosome arms. Heterochromatin appears to play an important evolutionary role in chromosome differentiation in Hisonotus species, especially in H. leucofrenatus. The geographic isolation of several H. leucofrenatus populations seems to have favored chromosome evolution of each sample analyzed.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Bandeamento Cromossômico
/
Citogenética
/
Peixes
Limite:
Animals
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Genet. mol. biol
Assunto da revista:
GENETICA
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Brasil