Inferring the evolution of reproductive isolation in a lineage of fossil threespine stickleback, <i>Gasterosteus doryssus</i>.

(b) Trait-by-trait divergence The first and last samples of lineage II were significantly different for 12 of 16 traits at the p < 0.003 level; a 13th trait was marginally non-significant with p = 0.005 ( figure 2 and table 1 ).

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