Organic carbon content (Corg), total nitrogen content (Ntot) and their stable isotopes (δ13C and δ15N) from two depth zones in Isfjord, Malangen, Saltfjord and Selbjørnfjord.

Benthic fauna and sediment was collected with a Van Veen grab in the outer parts of four fjords. Water was collected with a Niskin bottle from surface (~20 m depth) and bottom (~5 m above the seafloor) and suspended particulate organic matter was collected by filtration through pre-combusted GF/F filters. In each fjord, samples were collected from two depth zones (100-150 m & 200-250 m) at the following positions: Isfjord (100-150 m: 78.249°N, 13.978°E; 200-250 m: 78.213°N, 14.388°E & 78.162°N, 14.174°E), Malangen (100-150 m: 69.535°N, 18.510°E; 200-250 m: 69.468°N, 18.372°E), Saltfjord (100-150 m: 67.155°N, 14.152°E; 200-250 m: 67.175°N, 14.130°E), and Selbjørnfjord (100-150 m: 59.995°N, 5.234°E; 200-250 m: 59.986°N, 5.246°E). Samples were repeatedly treated with 2 M HCl to remove carbonates and then analyzed for their organic carbon content (Corg), total nitrogen content (Ntot) as well as their stable isotopes (δ13C and δ15N) with an Elemental Analyzer Flash EA 1112 Series interfaced to an Isotopic Ratio Mass Spectrometer IRMS Delta V Advantage (Thermo Electron Corp., Germany). Corg [in % for fauna and sediment; in mg L-1 for suspended particulate organic matter], Ntot [in % for fauna and sediment; in mg L-1 for suspended particulate organic matter], and their stable isotope ratios δ13C and δ15N [both in ‰] are given in the presented data.