Comparative cytogenetics of Hoplias malabaricus (Pisces, Erythrinidae): apopulation analysis in adjacent hydrographic basins
Genet. mol. biol
;
28(1): 103-110, Jan.-Mar. 2005. ilus
Artículo
en Inglés
| LILACS
| ID: lil-399624
ABSTRACT
The chromosomes of specimens from four Hoplias malabaricus populations from headwaters of adjacent river basins at Ponta Grossa, southern Brazil, were investigated using differential staining techniques (C-banding, AgNO3 and CMA3) and fluorescent in situ hybridization (FISH) with an 18S rDNA probe. The diploid chromosome number in representatives of all four populations was invariably 2n = 42, with karyotypes composed of 12 pairs of metacentrics and 9 pairs of submetacentrics, without heteromorphic sex chromosomes. This kind of karyotype represents cytotype A in regard to cytotypes identified previously in H. malabaricus, exhibiting however, at the same time, some differences in the distribution of constitutive heterochromatin segments and in the locations of nucleolus organizer regions (NORs). The apparent karyotype similarity strongly suggests a close kinship among the studied populations, but the small differences detected in the examined chromosomal markers indicate some evolutionary divergence due to gene flow restriction among them.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Bandeo Cromosómico
/
Peces
Límite:
Animales
Idioma:
Inglés
Revista:
Genet. mol. biol
Asunto de la revista:
Genética
Año:
2005
Tipo del documento:
Artículo
/
Documento de proyecto
País de afiliación:
Brasil
Institución/País de afiliación:
Universidade Estadual de Ponta Grossa/BR
/
Universidade Federal de São Carlos/BR
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