Gene flow and spatio-temporal genetic variation among sympatric populations of Tetranychus kanzawai (Acari: Tetranychidae) occurring on different host plants, as estimated by microsatellite gene diversity |
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Authors: | Shinya Nishimura Norihide Hinomoto Akio Takafuji |
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Institution: | (1) Laboratory of Ecological Information, Graduate School of Agriculture, Kyoto University, Kyoto Japan, 606-8502;(2) National Institute of Agrobiological Sciences, Tsukuba, Ibaraki Japan, 305-8634;(3) Present address: Agricultural Chemical Research Laboratory, Sumitomo Chemical Co., Ltd., Takarazuka, Hyogo Japan, 665-0051 |
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Abstract: | We investigated spatio-temporal genetic variation in allele frequency and estimated gene flow among sympatric populations of Tetranychus kanzawai on different host plants by the use of microsatellite markers. In the analysis of spatial genetic variation, no isolation by distance was detected among the populations. Gene flow between populations on Hydrangea macrophylla and those on other host plants was relatively restricted, whereas the populations on Akebia quinata and Clerodendrum trichotomum were almost panmictic. Our study on temporal genetic variation showed (1) that population differentiation was slightly reduced during the period from April to May owing to frequent gene flow among populations; and (2) that population differentiation was greatly enhanced from May to October because of bottleneck effects. Genetic differentiation among T. kanzawai populations was caused by the effect of host plants rather than by the effect of geographic distance among populations, suggesting possibility of sympatric host race formation in this species.This revised version was published online in May 2005 with a corrected cover date. |
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Keywords: | Gene flow Genetic differentiation Host race Microsatellite markers Sympatric speciation Tetranychus kanzawai |
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