Table S1 Allele frequency and heterozygosity data for microsatellite DNA loci.

Table S2 Pairwise t-tests in the traits among the main sub-populations studied.

Figure S1 Traits measured in the skulls of harbor porpoises. [Correction added 23 February 2012 after online publication: `Bilateral traits measured' changed to `Traits measured'.]

Figure S2 Analysis of STRUCTURE using methods from Evanno et al. (2005).

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