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 English
| LILACS
| ID: lil-484593
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.
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Index:
LILACS (Americas)
Main subject:
Chromosome Banding
/
Fishes
/
Genetics, Population
Limits:
Animals
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2008
Type:
Article
Affiliation country:
Argentina
/
Brazil
Institution/Affiliation country:
Universidad Nacional de Misiones/AR
/
Universidade Estadual de Ponta Grossa/BR
/
Universidade Federal de São Carlos/BR
/
Universidade Federal do Paraná/BR
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