Population analysis of a chromosome polymorphism in Astyanax (Teleostei, Characiformes) species endemic to the Iguaçu River
Genet. mol. biol
; 31(1,suppl): 239-242, 2008. ilus, tab
Article
in En
| LILACS
| ID: lil-484593
Responsible library:
BR26.1
ABSTRACT
Chromosomal analyses were performed in the fish Astyanax sp.D collected from three different points two streams from the right bank and one from the left bank of the Upper Iguaçu River, Paraná State, Brazil. The individuals from all localities possess 2n = 50 chromosomes and a FN = 84 (4m+24sm+6st+16a). The C-banding pattern was similar in all populations. However, within each population, an interindividual variation concerning the number and localization of heterochromatic bands was observed. Some of these variations were quantified in each population, and the results indicate that the samples were not different when studying the variable frequencies. Considering that Astyanax sp.D is typical in the headwaters of the Iguaçu River, these results were not expected. The data indicate that gene flow is occurring and that the Iguaçu River is not an ecological barrier among the Astyanax sp. D populations.
Key words
Full text:
1
Index:
LILACS
Main subject:
Chromosome Banding
/
Fishes
/
Genetics, Population
Limits:
Animals
Language:
En
Journal:
Genet. mol. biol
Journal subject:
GENETICA
Year:
2008
Type:
Article