Stratified dispersal and increasing genetic variation during the invasion of Central Europe by the western corn rootworm, Diabrotica virgifera virgifera.

After combining the two transect probabilities by Fisher's method, overall genetic isolation by temporal distance was highly significant ( P = 0.004).

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Allele size variance ( V ) displayed a positive correlation of marginal significance with the year of first observation and with geographic distance from Belgrade, in the western transect (Spearman's r = 0.65 and P = 0.07 for both tests), but not in the eastern transect (Spearman's r ≤ 0.33 and P ≥ 0.35) ( Fig. 3C,D ).

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