Geir Odd Johansen

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Forsker
Telefon: +4797060144
Avdeling: Økosystemprosesser

Arbeidsområde

Økosystemtoktet i Barentshavet

Studier av geografisk utbredelse av fisk

Studier av trofiske interaksjoner hos fisk

Klimaeffekter på fisk

Økologi i Barentshavet

Analyse av toktdata

Curriculum Vitae

2005- Forsker ved Havforskningsinstituttet (nåværende stilling)

2010-14 Faggruppeleder for Økosystemprosesser, Havforskningsinstituttet

2004-06 Postdoktor ved strategisk instituttprogram: ”Absolutt mengdeberegning av fisk". Havforskningsinstituttet.

2000-03 Forsker ved EU-prosjekt: ”Development of structurally detailed statistically testable models of marine populations”. Universitetet i Bergen.

2000 Forsker ved ”NORAD Diploma/M. Phil Course in Fisheries Biology and Fisheries Management”, Universitetet i Bergen.

1996-2000 Stipendiat ved Institutt for Fiskeri- og Marinbiologi, Universitetet i Bergen

Publikasjoner

Faglige foredrag

2018

Trophic level of cod in the Barents Sea - Estimates from stomach data, stable isotope data, and an ecosystem model.

Geir Odd Johansen, Edda Johannesen, Kirsteen M. MacKenzie, Cecilie Hansen, Elena Eriksen
2018

Fisheries in a warming Arctic - Distribution shifts in commercial fish stocks and consequences at different scales

Jan Erik Stiansen, Geir Odd Johansen, Asgeir Aglen, Johanna Jennifer Elisabeth Fall, Endre Moen
2017

In situ study of the functional response of cod to capelin using broadband acoustics and trawl sampling

Georg Skaret, Johanna Jennifer Elisabeth Fall, Per Fauchald, Øyvind Fiksen, Harald Gjøsæter, Edda Johannesen, Geir Odd Johansen, Espen Johnsen, Gavin Macaulay
2014

Consumption and growth in a seasonally varying environment

Edda Johannesen, Geir Odd Johansen, Knut Korsbrekke
2013

A framework for data flow from observations to advice – the development of a new, efficient data infrastructure at IMR

Nils Olav Handegard, Harald Gjøsæter, Geir Odd Johansen, Jens-Otto Krakstad, Sjur Ringheim-Lid, Helge Sagen, Trond Westgård, Geir Huse
2011

Future change in the distribution of fish and fisheries in the Barents Sea; experiences from the FishExChange project

Jan-Erik Stiansen, Sigbjørn Mehl, Geir-Odd Johansen, Cecilie Kvamme, Bjørn Ådlandsvik, Nils-Arne Ekerhovd, Røgnvaldur Hannesson
2003

Analysing interactions between capelin and cod in the Barents Sea by individual-based modelling

Geir Huse, Geir Odd Johansen, Bjarte Bogstad, Harald Gjøsæter
2003

Consumption of capelin (Mallotus villotus Muller 1776) by Norteast Arctic cod (Gadus morhua L.) in the Barents Sea

Geir Odd Johansen, Bjarte Bogstad, Harald Gjøsæter, Sigbjørn Mehl, Øyvind Ulltang
2003

Sild som promper: et økosystemperspektiv

Johansen, Geir Odd
2002

Natural mortality of juvenile herring (Clupea harengus L.) in the Barents Sea due to predation by North-east Arctic cod (Gadus morhua L.)

Geir Odd Johansen, Bjarte Bogstad, Sigbjørn Mehl, Øyvind Ulltang
2002

Data for modelling the migration of cod, capelin and herring in the Barents Sea

Johansen, Geir Odd
2002

Consumption of juvenile herring in the Barents Sea

Johansen, Geir Odd
2001

Presentasjon av fiskeribiologiutdannelsen ved Universitetet i Bergen

Johansen, Geir Odd

Vitenskapelige artikler (NVI)

2017

Towards ecosystem-based management: Identifying operational food-web indicators for marine ecosystems

Jamie Tam, Jason S. Link, Axel G. Rossberg, Stuart I Rogers, Phillip Levin, Marie-Joelle Rochet, Alida Bundy, Andrea Belgrano, Simone Libralato, Maciej T. Tomczak, Karen Van De Wolfshaar, Fabio Pranovi, Elena Gorokhova, Scott I. Large, Nathalie Niquil, Simon P.R. Greenstreet, Jean-Noel Druon, Jurate Lesutiene, Marie Johansen, Izaskun Preciado, Joana Patricio, Andreas Palialexis, Paul Tett, Geir Odd Johansen, Jennifer Houle, Anna Rindorf
ICES Journal of Marine Science 74 p. 2040-2052
2017

Towards ecosystem-based management: identifying operational food-web indicators for marine ecosystems

Tam J.C., Link J.S., Rossberg A.G., Rogers S.I., Levin P.S., Joëlle Rochet M., Bundy A., Belgrano A., Libralato S., Tomczak M., van de Wolfshaar K., Pranovi F., Gorokhova E., Large S.I., Niquil N., Greenstreet S.P.R., Druon J.-N., Lesutiene J., Johansen M., Preciado I., Patricio J., Palialexis A., Tett P., Johansen G.O., Houle J., Rindorf, A.
ICES Journal of Marine Science
2015

Seasonal variation in cod feeding and growth in a changing sea

Johannesen E., Johansen G.O. and Korsbrekke K.
Canadian Journal of Fisheries and Aquatic Sciences 72 p. 1-11
2013

Seasonal variation in geographic distribution of North East Arctic (NEA) cod - survey coverage in a warmer Barents Sea

Geir Odd Johansen, Edda Johannesen, Kathrine Michalsen, Asgeir Aglen, Åge Fotland
Marine Biology Research 9 p. 908-919
2013

Dispersal of the radionuclide caesium-137 (Cs-137) from point sources in the Barents and Norwegian Seas and its potential contamination of the Arctic marine food chain: Coupling numerical ocean models with geographical fish distribution data

Hilde Elise Heldal, Frode Bendiksen Vikebø, Geir-Odd Johansen
Environmental Pollution 180 p. 190-198
2012

Dispersal of the radionuclide caesium-137 (Cs-137) from point sources in the Barents and Norwegian Seas and its potential contamination of the Arctic marine food chain: Coupling numerical ocean models with geographical fish distribution data

Hilde Elise Heldal, Frode Bendiksen Vikebø, Geir Odd Johansen
Environmental Pollution 164 p. 1-10
2012

Thermal habitat for 0-group fish in the Barents Sea; how climate variability impacts their density, length, and geographic distribution

Elena Eriksen, Randi Ingvaldsen, Jan Erik Stiansen, Geir Odd Johansen
ICES Journal of Marine Science 69 p. 870-879
2009

Quantifying and reducing the surface blind zone and the seabed dead zone using new technology

Atle Totland, Geir Odd Johansen, Olav Rune Godø, Egil Ona, Terje Torkelsen
ICES Journal of Marine Science 66 p. 1370-1376
2009

Using acoustic technology to improve the modelling of the transportation and distribution of juvenile gadoids in the Barents Sea

Geir-Odd Johansen, Olav Rune Godø, Morten D. Skogen, Terje Torkelsen
ICES Journal of Marine Science 66 p. 1048-1054
2009

Acoustic species identification of schooling fish

Rolf Korneliussen, Yngve Heggelund, Inge K. Eliassen, Geir-Odd Johansen
ICES Journal of Marine Science 66 p. 1111-1118
2004

Studying spatial and trophic interactions between capelin and cod using individual-based modelling

Geir Huse, Geir-Odd Johansen, Bjarte Bogstad, Harald Gjøsæter
ICES Journal of Marine Science 61 p. 1201-1213
2004

Consumption of juvenile herring (Clupea harengus) by cod (Gadus morhua) in the Barents Sea: a new approach to estimating consumption in piscivorous fish

Geir Odd Johansen, Bjarte Bogstad, Sigbjørn Mehl, Øyvind Ulltang
Canadian Journal of Fisheries and Aquatic Sciences 61 p. 343-359
2003

Size-dependent predation on juvenile herring (Clupea harengus L.) by North-east Arctic cod (Gadus morhua L.) in the Barenta Sea

Johansen, Geir Odd
Sarsia 88 p. 136-153
2002

Temporal and spatial variation in predation on juvenile herring (Clupea harengus L.) by Northeast Arctic cod (Gadus morhua L.) in the Barents Sea in 1984-1997

Johansen, Geir Odd
ICES Journal of Marine Science 59
2002

Temporal and spatial variation in predation on juvenile herring (clupea harengus L.) by Northeast Arctic cod (Gadus morhua L.) in the Barents Sea

Johansen, Geir Odd
ICES Journal of Marine Science 59 p. 270-292

Rapporter og avhandlinger

2014

IESSNS international mackerel-ecosystem survey (2014813) 01.07.2014-28.07.2014

Geir Odd Johansen, Endre Grimsbø
2014

Report of the Workshop to develop recommendations for potentially useful Food Web Indicators (WKFooWI), 31 March–3 April 2014, ICES Headquarters, Copenhagen, Denmark. ICES CM 2014\ACOM:48

Organization ICES, Geir Odd Johansen
2014

Report of the Working Group on Integrating Surveys for the Ecosystem Approach (WGISUR), 21-23 January 2014, Nantes, France. ICES CM 2014\SSGESST:03

Organization ICES, Geir Odd Johansen, Elena Eriksen
2005

Estimates of cod's consumption of capelin and herring related to prey density, stock overlap and physical factors

Øyvind Ulltang, Geir Odd Johansen
2003

The predator-prey interaction between Northeast Arctic cod (Gadus morhua L.) and juvenile Norwegian spring-spawning herring (Clupea harengus L.) in the Barents Sea

Johansen, Geir Odd

Poster

2017

ARCtic Marine Resources and Climate Change: Environmental, Socio-Economic Perspectives and Governance

Angelika Renner, Sturla F Kvamsdal, Nils-Arne Ekerhovd, Alf Håkon Hoel, Bjarte Bogstad, Cecilie Hansen, Geir Odd Johansen, Anne Britt Sandø, Jan Erik Stiansen
2010

Ocean temperature, cod stock distribution and cod fisheries in the Barents Sea the last decades

Cecilie Kvamme, Geir Odd Johansen, Jan Erik Stiansen, Trond Westgård, Bjørn Ådlandsvik, Sigrid Lind, Randi Ingvaldsen

Kapitler og bøker

2010

A framework for storing, retrieving and analysing marine ecosystem data of different origin with variable scale and distribution in time and space

Trond Westgård, Geir Odd Johansen, Cecilie Kvamme, Bjørn Ådlandsvik, Jan Erik Stiansen
p. 417-432
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