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Table S1 Pairwise population θ/(1–θ) matrix derived from the θ estimator of Weir & Cockerham (1984) for the grassland species Metrioptera roeselii; 1320 permutations, bold values represent significant pairwise genetic differentiation (P = 0.05). P-values were corrected for multiple testing. Calculations were done in FSTAT 2.9.3 (Goudet 1995)

Table S2 Pairwise population θ/(1–θ) matrix derived from the θ estimator of Weir & Cockerham (1984) for the forest edge species Pholidoptera griseoaptera; 1320 permutations, bold values represent significant pairwise genetic differentiation (P = 0.05). P-values were corrected for multiple testing. Calculations were done in FSTAT 2.9.3 (Goudet 1995)

Fig. S1 Results of STRUCTURE analyses for Metrioptera roeselii (A) and Pholidoptera griseoaptera (B, C). A/B: Mean and individual posterior probabilities (LnP(D)) and ΔK values (Evanno et  al. 2005) based on 10 runs (burnin 50 000 + 100 000 MCMC) for = 1–12. C: Typical result of individual cluster membership and admixture for P.  griseoaptera at = 3. Note dominance of a single cluster in most populations of low to high fragmentation (1–8) and strong differentiation of two additional clusters at the high and very high fragmentation level (9–12).

[Correction added after online publication 27 October 2010: the Supporting information file was corrected.]

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