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Genetic differentiation of Culex pipiens (Diptera: Culicidae) in China

Published online by Cambridge University Press:  24 May 2007

F. Cui
Affiliation:
State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Graduate School, Chinese Academy of Sciences, Beijing 100080, China Institute of Evolutionary Sciences, Génétique et Environnement, Université de Montpellier II (CC 065), 34095 Montpellier 05, France
C.-L. Qiao
Affiliation:
State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Graduate School, Chinese Academy of Sciences, Beijing 100080, China
B.-C. Shen
Affiliation:
State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Graduate School, Chinese Academy of Sciences, Beijing 100080, China
M. Marquine
Affiliation:
Institute of Evolutionary Sciences, Génétique et Environnement, Université de Montpellier II (CC 065), 34095 Montpellier 05, France
M. Weill
Affiliation:
Institute of Evolutionary Sciences, Génétique et Environnement, Université de Montpellier II (CC 065), 34095 Montpellier 05, France
M. Raymond*
Affiliation:
State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Graduate School, Chinese Academy of Sciences, Beijing 100080, China Institute of Evolutionary Sciences, Génétique et Environnement, Université de Montpellier II (CC 065), 34095 Montpellier 05, France
*
*Author for correspondence Fax: (00 33) 4 67 14 36 22 E-mail: raymond@isem.univ-montp2.fr

Abstract

The population genetic structures of Culex pipiens Linnaeus were evaluated in China over a 2000 km transect that encompasses the two subspecies, C. p. pallens and C. p. quinquefasciatus. Four polymorphic allozyme loci were investigated in 1376 mosquitoes sampled from 20 populations across four provinces. These loci were not statistically dependent with no apparent heterozygote deficit or excess. On a regional scale (intra-province), a low (Fst=0.007–0.016) and significant genetic differentiation was found, with no clear geographical pattern. On a wider scale (inter-province), the genetic differentiation was higher (Fst=0.059), and an isolation by distance emerged. The results are compared with previous population genetic surveys of this mosquito species in different geographic areas over the world. The overall pattern suggests that Culex pipiens requires considerable distance (500–1000 km) to show isolation by distance, irrespective of the subspecies (C. p. pipiens, C. p. quinquefasciatus and C. p. pallens) or the geographic location.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2007

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