Table 2 3-way Mantel’s t test [23] for cophenetic comparisons among genetic distance matrices comparing genetic distances calculated via 6-, 7-, 8-, 10-, and 12-markers (X-matrix, no missing markers) to that of a matrix calculated with 1006 SNP markers (Y-matrix, no missing markers) using a Z-matrix calculated from 32,217 markers (20 % missing marker data allowed)