jbi12048-sup-0001-AppendixS1.docWord document55KAppendix S1 Results of Fu's FS and Fu and Li's F* neutrality tests in Metrioptera roeselii populations including associated P-values.
jbi12048-sup-0002-AppendixS2.docWord document631KAppendix S2 Bayesian phylogenetic tree of 245 individuals of Metrioptera roeselii sampled along the Baltic Sea coast based on mtDNA COI sequences inferred by MrBayes.
jbi12048-sup-0003-AppendixS3.docWord document233KAppendix S3 Genetic diversity of Metrioptera roeselii populations (Table S1), pairwise genetic differences between populations (Table S2), and a plot illustrating the genetic isolation of populations by geographical distance (Fig. S1).

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