Blar i Brage IMR på forfatter "Ottersen, Geir"
-
Seasonal plankton dynamics along a cross-shelf gradient
Stenseth, Nils Christian; Llope, Marcos; Anadón, Ricardo; Ciannelli, Lorenzo; Chan, Kung-Sik; Hjermann, Dag Ø.; Bagøien, Espen; Ottersen, Geir (Journal article; Peer reviewed, 2006-08-08)Much interest has recently been devoted to reconstructing the dynamic structure of ecological systems on the basis of time-series data. Using 10 years of monthly data on phyto- and zooplankton abundance from the Bay of ... -
Skilful prediction of cod stocks in the North and Barents Sea a decade in advance
Koul, Vimal; Sguotti, Camilla; Årthun, Marius; Brune, Sebastian; Dusterhus, Andre; Bogstad, Bjarte; Ottersen, Geir; Baehr, Johanna; Schrum, Corinna (Peer reviewed; Journal article, 2021)Reliable information about the future state of the ocean and fish stocks is necessary for informed decision-making by fisheries scientists, managers and the industry. However, decadal regional ocean climate and fish stock ... -
Some environmental factors that influence the growth of Arcto-Norwegian cod from the early juvenile to the adult stage
Helle, Kristin; Bogstad, Bjarte; Ottersen, Geir; Pennington, Michael (ICES CM documents, Working paper, 2000)A high growth rate for Arcto-Norwegian cod (Gadus morhua L.) in the Barents Sea and adjacent areas from the larval stage to the 0-group stage enhances survival and ultimately recruitment to the fishery. However, it appears ... -
Spatial patterns of age-0 cod survival in the Barents Sea
Ciannelli, Lorenzo; Dingsør, Gjert Endre; Bogstad, Bjarte; Ottersen, Geir; Chan, Kung-Sik; Gjøsæter, Harald; Stenseth, Nils Christian (ICES CM documents, Working paper, 2005)Apart from human harvest, recruitment dynamics is conceivably recognized as the main source of population variability of marine fish stocks. Factors affecting recruitment dynamics can change over both temporal and spatial ... -
Spawning stock and recruitment in North Sea cod shaped by food and climate
Olsen, Esben Moland; Ottersen, Geir; Llope, Marcos; Chan, Kung-Sik; Beaugrand, Grégory; Stenseth, Nils Christian (Journal article; Peer reviewed, 2010-09-01)In order to provide better fisheries management and conservation decisions, there is a need to discern the underlying relationship between the spawning stock and recruitment of marine fishes, a relationship which is ... -
Spawning stock and recruitment in North Sea cod shaped by food and climate
Olsen, Esben Moland; Ottersen, Geir; Llope, Marcos; Chan, Kung-Sik; Beaugrand, Grégory; Stenseth, Nils Christian (Journal article; Peer reviewed, 2010-09-01)In order to provide better fisheries management and conservation decisions, there is a need to discern the underlying relationship between the spawning stock and recruitment of marine fishes, a relationship which is ... -
Statistical modelling of temperature variability in the Barents Sea
Ottersen, Geir; Ådlandsvik, Bjørn; Loeng, Harald (ICES CM Documents;1994/S:2, Working paper, 1994)During the latter years an effort has been made to find out more about the relations between environmental variation and recruitment, growth, distribution and migration of fish. The rationale has to a large degree been ... -
Status for miljøet i Barentshavet: Rapport fra Overvåkingsgruppen 2020
Jelmert, Anders; Sandø, Anne Britt; Frie, Anne Kirstine Højholt; Bogstad, Bjarte; Grøsvik, Bjørn Einar; Eriksen, Elena; Hallfredsson, Elvar H.; Stenevik, Erling Kåre; Bagøien, Espen; Ottersen, Geir; Skaret, Georg; Höffle, Hannes; Vee, Ida; Johansson, Josefina; Jørgensen, Lis Lindal; McBride, Margaret; Chierici, Melissa; Dalpadado, Padmini; Ingvaldsen, Randi Brunvær; Lien, Vidar Surén; Høines, Åge Sigurd; Fransson, Agneta; Sundfjord, Arild; von Quillfeldt, Cecilie; Lydersen, Christian; Hop, Haakon; Strøm, Hallvard; Johnsen, Hanne; Routti, Heli Anna Irmeli; Danielsen, Ida Kristin; Aars, Jon; Kovacs, Kit M.; Helgason, Lisa Bjørnsdatter; Itkin, Mikhail; Pavlova, Olga; Assmy, Philipp; Descamps, Sebastien; Lind, Sigrid; Gerland, Sebastian; Skotte, Gunnar; Stene, Kristine O.; Leiknes, Øystein; Skjerdal, Hilde Kristin; Jensen, Henning; Jensen, Andre Frantzen; Green, Norman Whitaker; Lorentsen, Svein Håkon (Rapport fra havforskningen;2020 - 13, Research report, 2020)I rapporten dekkes tre hovedtemaer: (1) Dominerende trekk i status og utvikling i økosystemet i Barentshavet siden 2016 med vekt på å beskrive hvordan sentrale prosesser påvirker tilstanden; (2) en mer detaljert beskrivelse ... -
Status report on the Barents Sea Ecosystem, 2004-2005
Stiansen, Jan Erik; Bogstad, Bjarte; Budgell, W. Paul; Dalpadado, Padmini; Gjøsæter, Harald; Hauge, Kjellrun Hiis; Ingvaldsen, Randi; Loeng, Harald; Mauritzen, Mette; Mehl, Sigbjørn; Ottersen, Geir; Skogen, Morten D.; Stenevik, Erling Kåre (Fisken og havet, Research report, 2005)This report is intended as a rough overview of the status of the Barents Sea ecosystem in 2004, compared to a historical perspective. If possible the situation for 2005 is also treated. The aim of this report is to give ... -
The Norwegian plan for integrated ecosystem-based management of the marine environment in the Norwegian Sea
Ottersen, Geir; Olsen, Erik; van der Meeren, Gro; Dommasnes, Are; Loeng, Harald (Journal article; Peer reviewed, 2010-11-30)A White Paper on a new integrated management plan for the Norwegian Sea was launched by the Norwegian government in May 2009. Following international guidelines for ecosystem-based management, the plan provides an overall ... -
The Norwegian plan for integrated ecosystem-based management of the marine environment in the Norwegian Sea
Ottersen, Geir; Olsen, Erik; van der Meeren, Gro; Dommasnes, Are; Loeng, Harald (Journal article; Peer reviewed, 2010-11-30)A White Paper on a new integrated management plan for the Norwegian Sea was launched by the Norwegian government in May 2009. Following international guidelines for ecosystem-based management, the plan provides an overall ... -
The role of cod in the decline in arctic fishes in the Barents sea
Johannesen, Edda; Dolgov, Andrey V.; Ottersen, Geir (Lecture, 2018) -
Trophic interactions affecting a key ecosystem component: a multi-stage analysis of the recruitment of the Barents Sea capelin
Hjermann, Dag Ø.; Bogstad, Bjarte; Dingsør, Gjert Endre; Gjøsæter, Harald; Ottersen, Geir; Eikeset, Anne Maria; Stenseth, Nils Christian (Journal article; Peer reviewed, 2010-08-10)The Barents Sea stock of capelin (Mallotus villosus) has suffered three major collapses (>90% reduction) since 1985 due to recruitment failures. As capelin is a key species in the area, these population collapses have had ... -
Trophic interactions affecting a key ecosystem component: a multi-stage analysis of the recruitment of the Barents Sea capelin
Hjermann, Dag Ø.; Bogstad, Bjarte; Dingsør, Gjert Endre; Gjøsæter, Harald; Ottersen, Geir; Eikeset, Anne Maria; Stenseth, Nils Christian (Journal article; Peer reviewed, 2010-08-10)The Barents Sea stock of capelin (Mallotus villosus) has suffered three major collapses (>90% reduction) since 1985 due to recruitment failures. As capelin is a key species in the area, these population collapses have had ... -
Trophic interactions affecting a key ecosystem component: a multi-stage analysis of the recruitment of the Barents Sea capelin
Hjermann, Dag Ø.; Bogstad, Bjarte; Dingsør, Gjert Endre; Gjøsæter, Harald; Ottersen, Geir; Eikeset, Anne Maria; Stenseth, Nils Christian (ICES CM documents;2009/ C:07, Working paper, 2009) -
Utarbeidelse av et program for overvåkning av eutrofitilstand og- utvikling i norske kystfarvann basert på både tradisjonelle og høyteknologiske metoder
Ottersen, Geir; Aasen, Svein Erik; Aure, Jan; Danielssen, Didrik S.; Johnsen, Torbjørn Martin; Ostrowski, Marek; Skjoldal, Hein Rune; Svendsen, Einar; Søiland, Henrik; Sørensen, Kai; Tangen, Karl (Fisken og havet, Research report, 1998)This report describes methods for enhancement of the curent strategy for cutrophication surveillance through a case study of the Skagerrak region. As a basis for evaluation of different methods for monitoring ...