Kitlope Skeena Kwethluk Kol Utkholok Latitude * 53°15' N 54°12' N 60°49' N 53°49' N 57°43' N Longitude * 127°54' W 129°35' W 116°24' W 155°57' E 156°52' E Catchment area (km2) * 3206 51,383 3787 1502 1371 Channel complexity (nodes per kilometer) ** 18.03 21.65 21.49 16.32 4.96 Non-vegetative cover of floodplain study reach ** 49% 44% 11% 8% 18% Large wood cover of floodplain study reach ** 0.88% 0.55% 0.01% n/a n/a Annual max. water temp. (ºC) 13.5 16.8 16.8 15.1 18.8 Nitrate and nitrite (μg L-1) 23.63 ± 23.60 (13) 88.40 – 96.32 19.80 ± 11.60 (9) 7.53 – 47.53 14.52 ± 6.50 (52) 4.94 – 40.52 167.23 ± 129.27 (27) 8.84 – 591.02 51.65 ± 42.79 (18) 0.49 – 118.658 Ammonium (μg L-1) 19.21± 43.18 (26) 0 – 206.59 13.23±13.81 (52) 0 – 67.42 13.45 ± 13.81 (78) 0 – 65.30 241.26 ± 307.12 (123) 0 – 2600 45.57 ± 28.89 (29) 9.22 – 151.64 Soluble reactive phosphorus (μg L-1) 4.53 ± 5.16 (13) 0.71 – 15.55 2.29 ± 1.56 (9) 0.40 – 5.18 3.28 ± 1.44 (52) 0.51 – 66.54 13.95 ± 14.59 (28) 5.20 – 77.35 26.05 ± 27.18 (18) 7.06 – 107.14 Total organic carbon (mg L-1) 0.79 ± 0.56 (11) 0.17 – 1.65 1.33 ± 0.66 (9) 0.56 – 2.42 2.43 ± 1.66 (51) 0.77 – 6.98 1.32 ± 0.38 (4) 1.02 – 1.86 8.92 ± 4.53 (14) 3.02 – 17.74 Dissolved organic carbon (mg L-1) 0.47 ± 0.47 (24) 0 – 1.72 1.11 ± 0.64 (24) 0.26 – 2.69 1.92 ± 1.42 (77) 0.36 – 6.49 1.75 ± 0.82 1.03 – 3.56 7.46 ± 0.64 0.26 – 2.69 Specific conductance (μS) 15.8 ± 2.1 (22) 68.9 ± 5.9 (28) 105.8 ± 7.7 (87) 54.7 ± 6.9 (129) 71.8 ± 14.1 (98) Juvenile salmonid density (fish per square meter) 0.14 ± 0.08 (19) 0.20 ± 0.10 (11) 2.59 ± 5.70 (16) 3.71 ± 3.13 (16) 3.13 ± 4.04 (17) Riparian plant foliar δ15N (‰) -4.11± 1.94 (74) -5.83 – -3.73 -1.36 ± 1.05 (54) -2.47 – 0.06 0.56 ± 1.48 (57) -2.70 – 1.55 3.32±1.52 (74) 3.29 - 4.43 3.85 ± 2.20 (21) 1.38 - 5.58 Plants sampled for δ15N Co, E, G, D, Sa, W Co, G, D, W Bi, G, Bl, W(3), Co Ch, G, F, Se, N, W G, F, W