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Published in: Malaria Journal 1/2005

Open Access 01-12-2005 | Research

Genetic structure of Anopheles gambiae populations on islands in northwestern Lake Victoria, Uganda

Authors: Jonathan K Kayondo, Louis G Mukwaya, Aram Stump, Andrew P Michel, Mamadou B Coulibaly, Nora J Besansky, Frank H Collins

Published in: Malaria Journal | Issue 1/2005

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Abstract

Background

Alternative means of malaria control are urgently needed. Evaluating the effectiveness of measures that involve genetic manipulation of vector populations will be facilitated by identifying small, genetically isolated vector populations. The study was designed to use variation in microsatellite markers to look at genetic structure across four Lake Victoria islands and two surrounding mainland populations and for evidence of any restriction to free gene flow.

Methods

Four Islands (from 20–50 km apart) and two surrounding mainland populations (96 km apart) were studied. Samples of indoor resting adult mosquitoes, collected over two consecutive years, were genotyped at microsatellite loci distributed broadly throughout the genome and analysed for genetic structure, effective migration (Nem) and effective population size (Ne).

Results

Ne estimates showed island populations to consist of smaller demes compared to the mainland ones. Most populations were significantly differentiated geographically, and from one year to the other. Average geographic pair-wise F ST ranged from 0.014–0.105 and several pairs of populations had Ne m < 3. The loci showed broad heterogeneity at capturing or estimating population differences.

Conclusion

These island populations are significantly genetically differentiated. Differences reoccurred over the study period, between the two mainland populations and between each other. This appears to be the product of their separation by water, dynamics of small populations and local adaptation. With further characterisation these islands could become possible sites for applying measures evaluating effectiveness of control by genetic manipulation.
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Metadata
Title
Genetic structure of Anopheles gambiae populations on islands in northwestern Lake Victoria, Uganda
Authors
Jonathan K Kayondo
Louis G Mukwaya
Aram Stump
Andrew P Michel
Mamadou B Coulibaly
Nora J Besansky
Frank H Collins
Publication date
01-12-2005
Publisher
BioMed Central
Published in
Malaria Journal / Issue 1/2005
Electronic ISSN: 1475-2875
DOI
https://doi.org/10.1186/1475-2875-4-59

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