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

• Published in: Experimental & applied acarology Vol. 35; no. 1-2; pp. 59 - 71
• Main Authors: Nishimura, S, Hinomoto, N, Takafuji, A
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 01-01-2005; Springer Nature B.V
• Subjects: Akebia quinata; Animals; Biological and medical sciences; Clerodendrum; Female; Fundamental and applied biological sciences. Psychology; Gene flow; Gene Frequency; Genetic diversity; Genetic Variation; Genetics of eukaryotes. Biological and molecular evolution; Host plants; host race formation; Hydrangea macrophylla; Invertebrata; microsatellite repeats; Microsatellite Repeats - genetics; mites; Plants - parasitology; Population differentiation; Population Dynamics; population genetics; Population genetics, reproduction patterns; races; Spatial analysis; spatial variation; speciation; sympatric speciation; temporal variation; Tetranychidae; Tetranychidae - genetics; Tetranychus; Tetranychus kanzawai; Time Factors; Japan; Genetic variability; Tetranychidae; Sympatry; Spatial variation; Population genetics; Time variation; Tetranychus kanzawai; Acariformes; Arachnida; Gene flow; Acari; Actinedida; Arthropoda; Microsatellite DNA; Host plant; Invertebrata; Speciation
• ISSN: 0168-8162; 1572-9702
• DOI: 10.1007/s10493-004-2005-5

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.