气候变化领域集成服务门户(CCPortal): Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland

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DOI	https://doi.org/10.1594/PANGAEA.808534
	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
发布日期	2012-03-06
数据集类型	dataset
英文简介	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.
空间范围	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
时间范围	2003-10-07T00:00:00 - 2003-10-11T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215538
推荐引用方式 GB/T 7714	Christiansen,Jørgen S,Hop,et al. Biometry, stable isotopes and stomach contents of A. glacialis and B. saida from Northeast Greenland.2012-03-06.https://doi.org/10.1594/PANGAEA.808534.