|Title||A model of trophic interactions in the North Sea in 1981, the Year of the Stomach|
|Publication Type||Journal Article|
|Year of Publication||1995|
|Keywords||ANE, North Sea, biomass, Clupea harengus, collections, Copepoda, data, ecological balance, energy transfer, Euphausiacea, Gadus morhua, marine, multispecies fisheries, Polychaeta, primary production, Q1 01482 Ecosystems and energetics, stomach content, trophic structure|
This paper gives an overview of the trophic interactions in the North Sea in 1981 when 55 000 fish stomachs were sampled and analysed. The study is based on the data base of the ICES Multispecies Assessment Working Group (MS WG), and published information. A balanced, steady-state model of interactions and biomasses at all trophic levels is constructed using the ECOPATH II software. The results indicate that the food consumption rates used by the MS WG for three of the important gadoid species are unrealistically low, whereas other parameters appear very reasonable. Results from mixed trophic impact analysis, trophic aggregation, and other network analyses are presented, and the results are compared with earlier studies of the North Sea food web. Summaries are given to illustrate the distribution of flows between demersal and pelagic components, and between large ecological groupings.