Geir Odd Johansen
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.
2018
Fisheries in a warming Arctic - Distribution shifts in commercial fish stocks and consequences at different scales
2017
In situ study of the functional response of cod to capelin using broadband acoustics and trawl sampling
2014
Consumption and growth in a seasonally varying environment
2013
A framework for data flow from observations to advice – the development of a new, efficient data infrastructure at IMR
2011
Future change in the distribution of fish and fisheries in the Barents Sea; experiences from the FishExChange project
2003
Analysing interactions between capelin and cod in the Barents Sea by individual-based modelling
2003
Consumption of capelin (Mallotus villotus Muller 1776) by Norteast Arctic cod (Gadus morhua L.) in the Barents Sea
2003
Sild som promper: et økosystemperspektiv
2002
Natural mortality of juvenile herring (Clupea harengus L.) in the Barents Sea due to predation by North-east Arctic cod (Gadus morhua L.)
2002
Data for modelling the migration of cod, capelin and herring in the Barents Sea
2002
Consumption of juvenile herring in the Barents Sea
2001
Presentasjon av fiskeribiologiutdannelsen ved Universitetet i Bergen
Vitenskapelige artikler (NVI)
2017
Towards ecosystem-based management: Identifying operational food-web indicators for marine ecosystems
ICES Journal of Marine Science
74
p. 2040-2052
2017
Towards ecosystem-based management: identifying operational food-web indicators for marine ecosystems
ICES Journal of Marine Science
2015
Seasonal variation in cod feeding and growth in a changing sea
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
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
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
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
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
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
ICES Journal of Marine Science
66
p. 1048-1054
2009
Acoustic species identification of schooling fish
ICES Journal of Marine Science
66
p. 1111-1118
2004
Studying spatial and trophic interactions between capelin and cod using individual-based modelling
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
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
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
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
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
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
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
2005
Estimates of cod's consumption of capelin and herring related to prey density, stock overlap and physical factors
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
Poster
2017
ARCtic Marine Resources and Climate Change: Environmental, Socio-Economic Perspectives and Governance
2010
Ocean temperature, cod stock distribution and cod fisheries in the Barents Sea the last decades
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
p. 417-432
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