Table S1 Top US state exporters of goods to China from 2000 to 2005 (expressed as millions of USU+0024).

Table S2 Assignment of colonies collected from outlier sites using different genetic analyses.

Fig. S1 Principal components analyses (PCA) showing clustering of individuals based on microsatellite data.

Fig. S2 Results from analysis of molecular variance (amova) for different pre-defined groups as follows: (a) Main sites that are in close geographic proximity; (b) Same as (a) but data for individuals from sites ZH and ZS excluded; (c) Sites assigned to China_B1 and B2 clusters; *P < 0.05 (see text for various P values).

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