Evidence for extensive genetic differentiation among populations of the malaria vector Anopheles arabiensis in Eastern Africa

被引:61
作者
Donnelly, MJ [1 ]
Townson, H [1 ]
机构
[1] Univ Liverpool, Liverpool Sch Trop Med, Div Parasite & Vector Biol, Liverpool L3 5QA, Merseyside, England
关键词
microsatellites; population genetics; Anopheles arabiensis;
D O I
10.1046/j.1365-2583.2000.00197.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
We describe the geographical population structure of the malaria vector Anopheles arabiensis in Eastern Africa. Allelic variation at eight microsatellite loci was scored in samples from nine localities along a 4500 km transect from Sudan to Mozambique. Highly significant differences in genotype frequencies were found between all populations separated by more than 200 km. Populations within Malawi separated by 191 km were indistinguishable, as were those within Sudan separated by 134 km. F-ST and rho(ST) gave significant estimates of isolation by distance. These data, lead us to conclude that there are extensive barriers to gene flow in this region. The high estimates of N-m (9.4 from F-ST and 5.2 from rho(ST)) indicate recent range expansion in this species rather than extensive contemporary gene flow.
引用
收藏
页码:357 / 367
页数:11
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