Table S1. Concentration (mg/kg w.w.) of toxic elements in berries, mushrooms, fish, reindeer, and moose from the different sampling sites

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1 Supplementary: Table S. Concentration (mg/kg w.w.) of toxic elements in berries, mushrooms, fish, reindeer, and moose from the different sampling sites Berries Bilberries Jordanfoss (Norway) no. of pools 69.09; ; ; ; ; ; ; < 0.00 Durvatn (Norway) no. of pools 69.60; ; ; ; ; ; ;0.00 < 0.00 Gardsjøen (Norway) 69.04; ; ; ; ; ; ;0.009 < 0.00 Holmvatn (Norway) no. of pools 69.0; ; ; ; ; ; ;0.00 < 0.00

2 Table S.Cont. of 4 Grensa (Norway) no. of pools ; ; ; ; ; ; ;0.00 < 0.00 Børsevatn (Norway) no. of pools 69.6; ; ; ; ; ; ;0.0 < 0.00 Tromsøya, ref. (Norway) no. of pools 69.69; Stålvikbotn Balsfjord, ref. (Norway) no. of pools ; Nikel site (Russia) no. of pools ; < North (Russia) no. of pools 69.44; < < 0.00 < 0.000

3 Table S.Cont. of 4 East (Russia) no. of pools 69.; < South (Russia) 69.00; < Nellim (Finland) 6.64; ; ; ; ;0.000 < ;0.006 Lingonberries Durvatn (Norway) 69.60; ; ; ; ; ; ;0.000 < 0.00 Gardsjøen (Norway) 69.04; ; ; ; ; ; ;0.0 < 0.00

4 Table S.Cont. 4 of 4 Grensa (Norway) ; ; ; ; ; ; ;0.00 < 0.00 Børsevatn (Norway) 69.6; ;....; ; ; ; ;0.06 < 0.00 Sollia Jarfjord (Norway) ; ; ; ; ; ; ;0.00 < 0.00 Stålvikbotn Balsfjord, ref. (Norway) ; Nikel site (Russia) ; < 0.000

5 Table S.Cont. of 4 South (Russia) 69.00; < < East (Russia) 69.; < North (Russia) 69.44; < Inari (Finland) 6.96; < < Nellim (Finland) Cloudberries Jarfjord (Norway) 6.4; ; ; ; ;0....; ; ; ; ; ;0.04 < ; ; < 0.00

6 Table S.Cont. 6 of 4 Pasvik (Norway) 69.66; ; ; ; ; ; ;0.00 < 0.00 Pasvik Skogfoss (Norway) 69.69; Øvre Pasvik (Norway) 69.0; Kjelmøya (Norway) 69.64; Lakseidet Balsfjord, ref. (Norway) ; Storsteines, ref. (Norway) 69.40;

7 Table S.Cont. of 4 Nellim (Finland) 6.64; ; ; ; ;0.0 <0.00; ; Crowberries Jordanfoss (Norway) 69.09; ; ; ; ; ; ;0.006 < 0.00 Durvatn (Norway) 69.60; ; ; ; ; ; ;0.0 < 0.00 Grensa (Norway) ; ; ; ; ; ; ;0.006 < 0.00 Nikel site (Russia) ;

8 Table S.Cont. of 4 Bog bilberry Nikel site (Russia) Mushrooms Orange birch bolete Durvatn (Norway) ; ; ; ; ; ; ; ;0.09 < ;0.0 Grensa (Norway) ; ; ; ; ; ; ; ;0.0 Børsevatn (Norway) 69.6; ;... 0.; ; ; ; ; ;0. Tønsvika, ref. (Norway) 69.49; ; ; ; ; ; ;0.0 < 0.00

9 Table S.Cont. 9 of 4 Orange oak bolete Nikel site (Russia) ; South (Russia) 69.00; East (Russia) 69.; North (Russia) < LOD 69.44; Birch bolete Nikel site (Russia) Gypsy mushroom Durvatn (Norway) ; ; ; ; ; ; ; ; ;0.0

10 Table S.Cont. 0 of 4 Gardsjøen (Norway) 69.04; ; ; ; ; ; ; ;0.0 Grensa (Norway) ; ; ; ; ; ; ; ;0.0 Sollia Jarfjord ;0.9...; ; ; ; ; ; ;0.0 Bearded milkcap South (Russia) 69.00; Rollrim milkcap Nikel site (Russia) ;

11 Table S.Cont. of 4 Russula North (Russia) < LOD 69.44; Rufous milkcap Inari (Finland) 6.96; Mixed mushrooms Nellim (Finland) 6.4; ;0.0...; ; ; ; ;0.0 Fish Whitefish Tjærebukta (Norway) 69.; Ruskebukta (Norway) ;

12 Table S.Cont. of 4 Kuetsjarvi (Russia) ; < Rajakoski (Russia) 69.04;9.004 < < Virtuovoshjarvi (Russia) 6.0; < Kochejaur (Russia) ; < < Inari (Finland) 6.994; ;0.06

13 Table S.Cont. of 4 Perch Tjærebukta (Norway) 69.; ; ; ; ; ; ; ;0.6 Rundvannet (Norway) 69.66; single sample* <0.0; single sample* ; single sample* ; single sample* ; single sample* ; single sample* <0.00; single sample* ;0.6 Ruskebukta (Norway) ; Kuetsjarvi (Russia) ;

14 Table S.Cont. 4 of 4 Shuonojarvi (Russia) 69.46; Virtuovoshjarvi (Russia) 6.0; Kochejaur (Russia) ; Inari (Finland) 6.994; ; ; ; ; < 0.00; ;0.0 Vastusjärvi (Finland) 69.00;

15 Table S.Cont. of 4 Pike Tjærebukta (Norway) 69.; Ruskebukta (Norway) ; Kuetsjarvi (Russia) ; Rajakoski (Russia) 69.04; < Virtuovoshjarvi (Russia) 6.0; <

16 Table S.Cont. 6 of 4 Kochejaur (Russia) ; < Inari (Finland) 6.994; < < Arctic char Durvatn (Norway) ; Rabvatn (Norway) ; Holmvatn (Norway) 69.4;

17 Table S.Cont. of 4 Shuonojarvi (Russia) 69.46; Brown trout Durvatn (Norway) ; Gardsjøen (Norway) ; Rabvatn (Norway) ; Holmvatn (Norway) 69.4;

18 Table S.Cont. of 4 Kuetsjarvi (Russia) ; < < Game Reindeer Pasvik (Norway) 69.; ; ; ; ; ; ; < Paistunturi (Finland) ; ;0.0...; ; ; ; ;0.004 Moose Pasvik (Norway) 69.6; < 0.0; ; ; ; ; ;0.4 < 0.00

19 Table S.Cont. 9 of 4 Russia Unknown < Kyläjoki (Finland) 6.404; Angeli, Kaitavaara (Finland) ; Kuttura, Köysivaara (Finland) Ptarmigan Sevettijärvi (Finland) n of birds in a pool 6.; ; <

20 Table S.Cont. 0 of 4 Utsjoki (Finland) n of birds in a pool 69.64;.04 and ;0.000 and...;. and ;0.00 and ;.0099 (Lat = latitude, Long = longitude, Ni = nickel, Cu = copper, Co = cobalt, As = arsenic, Cd = cadmium, Pb = lead, Hg = total mercury, n = number of pools or samples in a pool, min = minimum, max = maximum, < LOD = concentrations below level of detection, ref. = reference site, conc. = concentration). are approximate since some are for lakes and grazing regions. Concentrations below LOD were substituted with a numeric value (LOD/ ). These values are included in the calculation of the mean and median. * 4 pools with individual fish in each pool and one single sample and < 0.00 and ;0.000

Note that concentration scales are different for the different elements. Figure S. Concentration (mg/kg w.

21 of 4 Figure S. Concentration (mg/kg w.w.) of toxic elements in lingonberries in the border region of Norway, Finland and Russia. The cities Nikel and Zapolyarny are indicated by black stars. Note that concentration scales are different for the different elements. Figure S. Concentration (mg/kg w.w.) of toxic elements in crowberries in the border region of Norway, Finland and Russia. The cities Nikel and Zapolyarny are indicated by black stars. Note that concentration scales are different for the different elements.

22 Figure S. Concentration (mg/kg w.w.) of toxic elements in mushrooms (Leccinum genus) in the border region of Norway, Finland and Russia. The cities Nikel and Zapolyarny are indicated by black stars. Note that concentration scales are different for the different elements. of 4

23 Figure S4. Principal component biplots of (a) food groups (berries: yellow, mushrooms: green, fish: purple, and game: red) and (b) sample location north of the NiCu smelter (north: green), south of the smelter (south: yellow) or at reference sites (ref.: red) in the projection of principal component (.0 % explained variance) and principal component (0.4 % explained variance). of 4

24 4 of 4 Table S. European Union maximum levels for toxic elements in food items [69] compared with results from the present study. w.w. = wet weight. Maximum levels set by the EU Lead (mg/kg w.w.): Fish muscle 0.0 None exceeded Observed data Species Location n > ML / ns * Range of samples > ML Meat 0.0 Moose Pasvik (Norway) / 0.4 Berries and small fruit 0.0 None exceeded Cadmium (mg/kg w.w.) Meat 0.00 None exceeded Fish muscle 0.00 None exceeded Fungi.0 Gypsy mushroom Mercury (mg/kg w.w.) Ptarmigan Russia / 4 0. Gardsjøen (Norway) /.. Durvatn (Norway) /..9 Fish muscle 0.0 Perch Tjærebukta (Norway) / Pike muscle.0 None exceeded Rundvannet (Norway) / * n > ML / ns = number of samples exceeding maximum levels out of the total number of samples of the same species of bovine animals, sheep, pig and poultry (excluding offal) and fishery products

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