Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland ...

• Main Authors: Christiansen, Jørgen S, Hop, Haakon, Nilssen, Einar M, Joensen, John
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: International Polar Year 2007-2008 IPY; Arctogadus glacialis; Boreogadus saida; Dove bugt; Greenland; International Polar Year; IPY
• Online Access: https://dx.doi.org/10.1594/pangaea.808534; https://doi.pangaea.de/10.1594/PANGAEA.808534

Two gadoid fishes, Arctogadus glacialis and Boreogadus saida, often coexist (i.e. sympatric) in the fjords and shelf areas of the Arctic seas, where they likely share the same food resources. Diet composition from stomach contents, i.e. frequency of occurrence (FO) and Schoener's index (SI), and stable isotope signatures (d13C and d15N) in muscle of these sympatric gadoids were examined from two fjords in NE Greenland-Tyrolerfjord (TF, ~74°N, sill present) and Dove Bugt (DB, ~76°N, open). Twenty-three prey taxa and categories were identified and both gadoids ate mostly crustaceans. The SI values of 0.64-0.70 indicated possible resource competition, whereas FO differed significantly. A. glacialis fed mainly on the mysid Mysis oculata and other benthic-associated prey, whereas B. saida ate the copepod Metridia longa and other pelagic prey. Both diet and stable isotopes strongly suggest a spatial segregation in feeding habitat, with A. glacialis being associated with the benthic food web (mean d13C = -20.81 per ... : Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...