Spread of a new parasitic B chromosome variant is facilitated by high gene flow.

Spearman non-parametric correlation tests showed a marginally significant negative correlation between the geographical distance to the center of origin and the mean frequency of the B 24 chromosomes found in 2004 ( r s = −0.77, t = −2.43, P = 0.07), but this association was significant for the 2006 sample ( r s = −0.93, t = −4.97, P = 0.0077).

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the population closest to Torrox, showing B 2 frequency decrease approaching significance ( Table 2 ).

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