International Council for the Exploration of the Sea
WGINORreport2020_with corrigendum.pdf (7.39 MB)

Working Group on the Integrated Assessments of the Norwegian Sea (WGINOR; outputs from 2020 meetings)

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Version 2 2023-06-23, 10:50
Version 1 2022-01-18, 15:10
posted on 2023-06-23, 10:50 authored by ICESICES

Corrigendum (23/06/2023):  An error in the data used to support primary production estimates was detected and corrected in 2022. Increasing trends in net primary production reported in the highlights, in the graphical summary and in the phytoplankton section are erroneous. Readers should refer to the WGINOR 2023 report (ICES, 2023; where the error has been corrected.

The task of the Working Group on Integrated Ecosystem Assessments for the Norwegian Sea (WGINOR) is to advance the understanding of the Norwegian Sea ecosystem and to develop an operational approach for integrated ecosystem assessment (IEA) that is applicable to manage-ment. This includes research on functional connections within the ecosystem, compiling relevant time series and develop models suitable for IEA. The current report contains the results from the second meeting of a 3-year term which has six Terms of Reference (ToRs).An interim assessment of the ecosystem (ToR A) shows that since 2016 the water has become fresher and cooled slightly. Primary production has been higher the last 7 years than previously, while zooplankton biomass remains low as it has since 2003. Biomass of the major pelagic stock shows a declining trend and the decline in seabird populations have continued.Further development of the IEA approach include work with classification of trends in time se-ries of physical and biological ecosystem components (to be used for communication) and warn-ing signal analyses based on trend estimation and an outlier detection analysis of the same time series (ToR A). Work has also been done on a framework for forecasting ocean climate based on statistical models (ToR C) and a foodweb based model assessment with hindcast and forecast properties using a chance and necessity modelling approach (ToR D), and a plan has been made for a framework for exploring multispecies harvest control rules for pelagic fish (ToR B). Further work on these issues will be done in the years 2021-2023 through the research project “Sustaina-ble multispecies harvest from the Norwegian Sea and adjacent ecosystems” at the Institute for Marine Research (Norway).Work on revising the Norwegian Sea ecosystem overview (EO) was continued (ToR F). A work-shop involving experts external to WGINOR will follow up this.Science highlights from the meeting includes two model-based studies, one on harvest patterns in zooplankton fisheries and another exploring the population and ecosystem effects of changes in harvest control rules of two target species; mackerel and hake; in the Norwegian Sea and the California Current system


Published under the auspices of the following ICES Steering Group or Committee


Published under the auspices of the following ICES Expert Group or Strategic Initiative



ICES Scientific Reports





Contributors (Editors)

Per Arneberg; Anna Ólafsdóttir

Contributors (Authors)

Kjell Rong Utne; Tycho Anker-Nilsen; Holly Ann Perryman; Jan Arge Jacobsen; Kjell Arne Mork Per Arneberg; Erik Askov Mousing; Helga Bára Vang; Sigurvin Bjarnason; Cecilie Broms; Jóhannis Danielsen; Solva Eliassen; Elvar Halfredsson; Cecilie Hansen; Hjálmar Hátún; Åge Høines; Eydna í Homrum; Daniell Howell; Dorothy Jane Dankel; Teunis Jansen; Erling Kåre Stenevik; Hiroko Kato Solvang; Anne Kirstine Frie; Svein-Håkon Lorentsen; Sonja Elin Kleven Jakobsen; Inga Kristiansen Mimi Lam; Lisa Libungan; Xiaozi Liu; Mette Mauritzen; Webjørn Melle; Nikolaos Nikolioudakis Leif Nøttestad; Anna Ólafsdóttir; Guðmundur Óskarsson; Alfonso Perez-Rodriguez; Hildur Pétursdóttir; Benjamin Planque; Warsha Singh; Øystein Skagseth; Morten Skogen; Aril Slotte Petur Steingrund; Espen Strand; Szymon Surma; Gro van der Meeren; Knut Yngve Børsheim Fabian Zimmermann



Recommended citation

ICES. 2021. Working Group on the Integrated Assessments of the Norwegian Sea (WGINOR; outputs from 2020 meeting). ICES Scientific Reports. 3:35. 114pp.

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