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

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.808534
Keywords
  • -
  • (Prey No
  • )/(Total No
  • Of Prey Taxa)
  • Total No
  • = 117 (Tyrolerfjord) And 116 (Dove Bugt)
  • (Prey No
  • )/(Total No
  • Of Prey Taxa)
  • Total No
  • = 324 (Tyrolerfjord) And 211 (Dove Bugt)
  • #N = 19
  • A
  • Glacialis
  • A
  • Glacialis
  • Relative Stomach Content
  • #N = 29
  • A
  • Glacialis D13C T
  • A
  • Glacialis D15N T
  • A
  • Glacialis L
  • A
  • Glacialis M
  • A
  • Glacialis Std Dev
  • A
  • Glacialis Stomach Cont
  • Arctogadus Glacialis
  • D13C
  • Tissue
  • Arctogadus Glacialis
  • D15N
  • Tissue
  • Arctogadus Glacialis
  • Length
  • Arctogadus Glacialis
  • Mass
  • Arctogadus Glacialis
  • Standard Deviation
  • Arctogadus Glacialis
  • Stomach Content
  • B
  • Saida
  • B
  • Saida
  • Relative Stomach Content
  • B
  • Saida D13C T
  • B
  • Saida D15N T
  • B
  • Saida L
  • B
  • Saida M
  • B
  • Saida Std Dev
  • B
  • Saida Stomach Cont
  • Boreogadus Saida
  • D13C
  • Tissue
  • Boreogadus Saida
  • D15N
  • Tissue
  • Boreogadus Saida
  • Length
  • Boreogadus Saida
  • Mass
  • Boreogadus Saida
  • Standard Deviation
  • Boreogadus Saida
  • Stomach Content
  • Calculated After Schoener (1970)
  • D13C
  • D15N
  • F:M Ratio A
  • Glacialis
  • F:M Ratio B
  • Saida
  • Frequency Of Occurrence
  • Gender
  • Index
  • International Polar Year (2007-2008)
  • Ipy
  • Isotope Ratio Mass Spectrometry
  • Mass
  • N Of A
  • Glacialis / B
  • Saida
  • Number Of Taxa
  • Of A
  • Glacialis (Number
  • Range)
  • Of A
  • Glacialis Stomachs With Only 1 Prey Taxon
  • Of B
  • Saida (Number
  • Range)
  • Of B
  • Saida Stomachs With Only 1 Prey Taxon
  • Prey
  • Prey Taxa
  • Prop
  • Proportion
  • Proportion Stom Cont
  • P-Value For Chi-Square Test Of Frequency Of Occurrence
  • Samp Com
  • Sample Comment
  • Schoener'S Index For Sympatric Gadoids
  • Specific To A
  • Glacialis Within Fjord Habitat
  • Specific To B
  • Saida Within Fjord Habitat
  • Taxa
  • Tl
  • Trophic Level

Abstract

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 mil, d15N = 14.92 per mil) and B. saida with the pelagic food web (mean d13C = -21.25 per mil, d15N = 13.64 per mil). The dietary differences and isotopic signals were highly significant in the secluded TF and less clear in the open DB, where prey and predators may be readily advected from adjacent areas with other trophic conditions. This is the first study on the trophic position of A. glacialis inferred from analyses of stable isotopes. The subtle interaction between the Arctic gadoids should be carefully monitored in the light of ocean warming and ongoing invasions of boreal fishes into the Arctic seas.

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