A weak and marginally significant correlation between geographic distance and gene differentiation was found.
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Stochasticity in space, persistence in time: genetic heterogeneity in harbour populations of the introduced ascidian Styela plicata.
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There is also a highly significant correlation between F ST and D est values for both years (correlation coefficients r > 0.95, Fig. 5 ), indicating that the differentiation level for any given population pair was maintained over the period studied.