Abstract
In this study, we explored the population genetics of Dendrothrips minowai Priesner, one of the most destructive horticultural pests, in Guizhou Province of China. We have analyzed the data of mitochondrial cytochrome c oxidase subunit I (COI) gene sequences of D. minowai from 27 populations sampled over two years in Guizhou. The results confirmed that the thrips retained moderate levels of genetic diversity (including number of haplotypes, haplotype diversity and nucleotide diversity). Three population groups could be identified according to spatial analysis of molecular variance (SAMOVA). A similar tendency was found according to phylogenetic trees. The AMOVA revealed that >52% and 38% of variation was attributed to groups and individuals within populations, respectively. Gene flow among populations, estimated using the coalescent method, was relatively high (M=196.8–825.4). Star-like networks and the demographic analysis (including neutrality testing and mismatch distribution) indicated that thrips underwent a recent population expansion in Guizhou and began to diverge in the Late Pleistocene. The results provided evidence that the eastern region of Guizhou was the source area for the species.
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