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Table S1 Summary of the hatchery program for brown trout within the study area since 1981. While in some years small proportions were stocked as alevins or 1 + fish, the large majority were raised for some weeks in the hatchery or in small streamlets before released into the stream of origin, with the exception that the river Aare was regularly stocked also with fish originating from other streams of the catchment area (mainly Müsche).

Fig. S1 Correspondence between FST and Dest estimates.

Fig. S2 Graphical analyses to infer the most likely K value. a) Mean L(K) (± sd) as a function of the number of clusters (K) across 6 runs obtained with STRUCTURE. The ‘break in slope’ at K = 6 represents the most likely n of K. b) After applying the method described in Evanno et al. (2005), the highest peak represents the most likely K value (= 3). ΔK was calculated as ΔK = m|L′′(K)|/ s[L(K)].

Fig. S3 Same as Figure 3 with photos of example specimens plotted along principal component 1 (x- axis). Deformation grids represent shape at the negative and positive extremes of PC1.

Fig. S4 Same as Figure 3 with photos of example specimens plotted along principal component 2 (y- axis). Photos on the left show females, photos on the right show males. Deformation grids represent shape at the negative and positive extremes of PC2.

Fig. S5 The number of weirs (nweirs) was positively related to waterway distance (geoD) between pairs of populations (Mantel test: R = 0.051, < 0.001). Every data point represents a pairwise population comparison.

FilenameFormatSizeDescription
MEC_5581_sm_TableS1-FigS1-S5.docx426KSupporting info item
MEC_5581_sm_TableS1-FigS1-S5.doc469KSupporting info item

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