Persistence of Anopheles arabiensis during the severe dry season conditions in Senegal: an indirect approach using microsatellite loci
Article first published online: 25 DEC 2001
Insect Molecular Biology
Volume 9, Issue 5, pages 467–479, October 2000
How to Cite
Simard, F., Lehmann, T., Lemasson,, J.-J., Diatta, M. and Fontenille, D. (2000), Persistence of Anopheles arabiensis during the severe dry season conditions in Senegal: an indirect approach using microsatellite loci. Insect Molecular Biology, 9: 467–479. doi: 10.1046/j.1365-2583.2000.00210.x
- Issue published online: 25 DEC 2001
- Article first published online: 25 DEC 2001
- Received 23 February 2000;accepted following revision 8 June 2000.
- Anopheles arabiensis;
- dry season;
- effective population size
Variation at nine microsatellite loci was investigated to understand how Anopheles arabiensis populations survive the dry season in the sahelian region of Senegal. Low estimates of genetic differentiation (FST = 0.012, RST = 0.009) between two populations, 250 km apart, suggested extensive gene flow across this distance. Despite extreme seasonal fluctuation in abundance with dry season minima in which mosquitoes virtually disappeared, allele frequencies remained stable over time in the village of Barkedji from August 1994 to December 1997 (including four rainy seasons and three dry seasons). The effective population size (Ne) was estimated to be 601 with 95% CI (281, 1592), providing strong evidence against annual bottlenecks. Differences in measures of genetic diversity and linkage disequilibrium between the dry and the rainy seasons were not detected. These results suggest that despite extreme minima in local density, An. arabiensis maintains large permanent deme spread out over large area.