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
Dans Anglais
| 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.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Zébrage chromosomique
/
Poissons
/
Génétique des populations
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Genet. mol. biol
Thème du journal:
Génétique
Année:
2008
Type:
Article
Pays d'affiliation:
Argentine
/
Brésil
Institution/Pays d'affiliation:
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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