Data/hora: 16/06/2024 19:06:35

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