Fig. S1 A two-dimensional genetic network representing the genetic relationship among fishers (Martes pennanti) sampled from 3q locations in Ontario, Canada during 2000–2003 and profiled at 16 microsatellite loci. Edge length is proportional to the genetic distance between populations. The network was built following Dyer &Nason (2004) using the Genetstudio software (Dyer 2009). It was first calculated by Garroway et al. (2008). This network is modified in that here we did not include nodes for the Adirondack region of New York and Gatineau, Quebec, due to differences in data collection nor did we include the Bruce Peninsula, Ontario in order to reduce the effects of artificially inflated resistance values associated with map edges (Koen et al. 2010). We used the shortest path between nodes, with distance calculated as the sum of edge weights, as our measure of genetic distance. This measure has recently been called both ‘graph distance’ (Dyer &Nason 2004; Garroway et al. 2008) and ‘conditional genetic distance (cGD; Dyer et al. 2010) in landscape genetics studies. We used this distance measure as a response variable to model landscape genetic resistance to gene flow in fishers. The network is projected using Cytoscape 2.7.0 (Shannon et al. 2003).

Fig. S2 Labelled map of sample sites. Below are sample sizes from each site. Angelsea-Grimsthorpe (AG; n = 16), Anson-Lutterworth (AL; n = 25), Algonquin (AQ; n = 20), Anstruther (AS; n = 24), Badgerow (BA; n = 22), Burton-McKenzie (BK; n = 16), Belmont (BL; n = 7), Blair-Mowat (BM, n = 26), Broughman (BR; n = 23), Carlow-Bangor (CB; n = 20), Carling-Ferguson (CF; n = 8), Conger-Freeman (CM; n = 15), Dalhousie (DL; n = 20), Darling (DR; n = 22), Escott-Yonge (EY; n = 20), Falconer (FL; n = 22), Fraser-Richards (FR; n = 21), Galway (GW; n = 20), Hungerford-Huntington (HH; n = 14), Kennebec (KB; n = 23); Loughborough-Bedford (LB; n = 31), Lyndoch (LN; n = 19), Monteith-Christie (MC; n = 26), Marmora-Lake (ML; n = 32), McNab (MN; n = 24), Montague (MT; n = 21), Olrig Cluster (OL; n = 14), Orillia-Ramara (OR; n = 17), Prescott (PR; n = 48), Ramsey-Huntley (RH; n = 20), Ross (RO; n = 19).

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