Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland
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), an...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.808534 2023-05-15T14:26:05+02:00 Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland Christiansen, Jørgen S Hop, Haakon Nilssen, Einar M Joensen, John MEDIAN LATITUDE: 75.458335 * MEDIAN LONGITUDE: -20.383330 * SOUTH-BOUND LATITUDE: 74.466670 * WEST-BOUND LONGITUDE: -21.183330 * NORTH-BOUND LATITUDE: 76.450000 * EAST-BOUND LONGITUDE: -19.583330 * DATE/TIME START: 2003-10-07T00:00:00 * DATE/TIME END: 2003-10-11T00:00:00 2012-03-06 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.808534 https://doi.org/10.1594/PANGAEA.808534 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.808534 https://doi.org/10.1594/PANGAEA.808534 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Christiansen, Jørgen S; Hop, Haakon; Nilssen, Einar M; Joensen, John (2012): Trophic ecology of sympatric Arctic gadoids, Arctogadus glacialis (Peters, 1872) and Boreogadus saida (Lepechin, 1774), in NE Greenland. Polar Biology, 35(8), 1247-1257, https://doi.org/10.1007/s00300-012-1170-y International Polar Year (2007-2008) IPY Dataset 2012 ftpangaea https://doi.org/10.1594/PANGAEA.808534 https://doi.org/10.1007/s00300-012-1170-y 2023-01-20T07:32:55Z 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. Dataset Arctic Arctic Arctogadus glacialis Boreogadus saida Dove bugt Greenland International Polar Year IPY Polar Biology PANGAEA - Data Publisher for Earth & Environmental Science Arctic Greenland Tyrolerfjord ENVELOPE(-21.883,-21.883,74.517,74.517) Dove Bugt ENVELOPE(-20.407,-20.407,76.712,76.712) ENVELOPE(-21.183330,-19.583330,76.450000,74.466670) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
International Polar Year (2007-2008) IPY |
spellingShingle |
International Polar Year (2007-2008) IPY Christiansen, Jørgen S Hop, Haakon Nilssen, Einar M Joensen, John Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland |
topic_facet |
International Polar Year (2007-2008) IPY |
description |
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. |
format |
Dataset |
author |
Christiansen, Jørgen S Hop, Haakon Nilssen, Einar M Joensen, John |
author_facet |
Christiansen, Jørgen S Hop, Haakon Nilssen, Einar M Joensen, John |
author_sort |
Christiansen, Jørgen S |
title |
Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland |
title_short |
Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland |
title_full |
Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland |
title_fullStr |
Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland |
title_full_unstemmed |
Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland |
title_sort |
biometry, stable isotopes and stomach contents of a. glacialis and b. saida from northeast greenland |
publisher |
PANGAEA |
publishDate |
2012 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.808534 https://doi.org/10.1594/PANGAEA.808534 |
op_coverage |
MEDIAN LATITUDE: 75.458335 * MEDIAN LONGITUDE: -20.383330 * SOUTH-BOUND LATITUDE: 74.466670 * WEST-BOUND LONGITUDE: -21.183330 * NORTH-BOUND LATITUDE: 76.450000 * EAST-BOUND LONGITUDE: -19.583330 * DATE/TIME START: 2003-10-07T00:00:00 * DATE/TIME END: 2003-10-11T00:00:00 |
long_lat |
ENVELOPE(-21.883,-21.883,74.517,74.517) ENVELOPE(-20.407,-20.407,76.712,76.712) ENVELOPE(-21.183330,-19.583330,76.450000,74.466670) |
geographic |
Arctic Greenland Tyrolerfjord Dove Bugt |
geographic_facet |
Arctic Greenland Tyrolerfjord Dove Bugt |
genre |
Arctic Arctic Arctogadus glacialis Boreogadus saida Dove bugt Greenland International Polar Year IPY Polar Biology |
genre_facet |
Arctic Arctic Arctogadus glacialis Boreogadus saida Dove bugt Greenland International Polar Year IPY Polar Biology |
op_source |
Supplement to: Christiansen, Jørgen S; Hop, Haakon; Nilssen, Einar M; Joensen, John (2012): Trophic ecology of sympatric Arctic gadoids, Arctogadus glacialis (Peters, 1872) and Boreogadus saida (Lepechin, 1774), in NE Greenland. Polar Biology, 35(8), 1247-1257, https://doi.org/10.1007/s00300-012-1170-y |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.808534 https://doi.org/10.1594/PANGAEA.808534 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.808534 https://doi.org/10.1007/s00300-012-1170-y |
_version_ |
1766298561246396416 |