Data/hora: 02/06/2024 15:42:30

Provedor de dados: | 74
País: | Brazil
Título: | Genetic differentiation in geographically close populations of the water rat Nectomys squamipes (Rodentia, Sigmodontinae) from the Brazilian Atlantic Forest
Autores: | Maroja,L.S.; Almeida,F.C.; Seuánez,H.N.
Data: | 2003-12-01
Ano: | 2003
Palavras-chave: | Microsatellites; Migration; Population genetics; Schistosoma mansoni host; Sigmodontinae.
Resumo: | We examined the genetic structure and the effects of a bottleneck in populations of the water rat Nectomys squamipes, a primary host of Schistosoma mansoni. Eight microsatellite loci were studied in 7 populations from the Sumidouro region of the Brazilian state of Rio de Janeiro. Our data, covering a four-year period during which a bottleneck occurred, revealed substantial variation (6-31 alleles per locus) and high levels of both observed (0.718-0.789) and expected (0.748-0.832) heterozygosity. Most populations were in Hardy-Weinberg equilibrium without linkage disequilibrium between loci. Overall average genetic differentiation between populations (estimated with the F ST (q) and R ST (r) analogues was 0.037 for q and 0.060 for r. There was significant allelic and genotypic differentiation between populations, especially in pairwise comparisons that included the most geographically isolated population. Direct migration estimates showed a low rate of migration, indicating that infected N. squamipes populations had a limited ability to spread S. mansoni. When the pre- and post-bottleneck populations were compared there was no detectable reduction in heterozygosity or allele number, although a significant excess of heterozygosity was detected in the post-bottleneck population.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400002
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572003000400002
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.26 n.4 2003
Fonte: | info:eu-repo/semantics/openAccess