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• W2022135688 abstract "The eastern Bering Sea (EBS) and Barents Sea (BS) are both high-latitude, subarctic ecosystems that share many similar biophysical and trophic characteristics, and support valuable commercial fisheries. In this paper we compare system-level characteristics that make the Bering and Barents Sea ecosystems unique. We use Ecopath models and systems ecology macrodescriptor metrics applied to the two marine ecosystems to identify key areas of differences and similarities. Metrics calculated include number of species, number of interactions or trophic links, connectivity of the system, number of interactions per species, a measure of directed connectance, and an assessment of overall web interaction strength. In addition, number of basal species, number of top predators, total number of intermediate species, number of cannibals, number of cycles, number of omnivores, number of predators for a prey item, number of prey items for a predator, predator to prey ratio, and other indices were enumerated. Calculated food-web metrics for the eastern Bering and Barents Seas are compared between systems as well as with other similar metrics from published sources. We attempt to relate these observations to the questions of the uniqueness of marine food webs, implications for system stability, how climate impacts the physical environment, how the physical environment affects the structure of fish communities in each sea, and how changes in the physical environment affect the production of fish and the ability of the Bering and Barents Seas to support stable fisheries and productive ecosystems. Results show that the average number of trophic steps from primary producers to predators is shorter in the EBS. In the EBS, trophic pathways are shorter and more linear, there are more benthic species (flatfish and crabs) and there are both pelagic and benthic food webs. The BS is mainly a pelagic ecosystem. More production flows to the detritus pool in the BS most likely due to its deeper average depth (EBS: 50 m, BS: 200 m deep). The EBS is more efficient at converting primary production into upper trophic level biomass since there are fewer trophic steps and primary production fuels both the pelagic and benthic food webs. Commercial fish species biomass is greater in the EBS (7.6 mt) compared with BS (3.8 mt). Many alternate pathways exist in the BS, thus there are no single critical species creating bottlenecks. Results suggest that the BS may be more stable than the EBS." @default.
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• W2022135688 date "2009-10-01" @default.
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• W2022135688 title "A macrodescriptor perspective of ecological attributes for the Bering and Barents Seas" @default.
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• W2022135688 doi "https://doi.org/10.1016/j.dsr2.2008.11.024" @default.
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