Comparative cytogenetics of Hoplias malabaricus (Pisces, Erythrinidae): apopulation analysis in adjacent hydrographic basins
Genet. mol. biol
;
28(1): 103-110, Jan.-Mar. 2005. ilus
Article
in English
| 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.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Chromosome Banding
/
Fishes
Limits:
Animals
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2005
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Estadual de Ponta Grossa/BR
/
Universidade Federal de São Carlos/BR
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