Photo of Dag

Dag Ø. Hjermann

Office and mobile phone: +47 9765 5636
Email: ,
Mail: NIVA, Gaustadalléen 21, NO-0349 Oslo, Norway

I am an ecologist working 80% of my time at Norwegian Institute for Water Research (NIVA) and 20% of my time at CEES, University of Oslo. Since 2001, my main scientific interest has been to study population dynamics of marine populations using statistical analysis of time series. Much of my work has focused on the large fish stocks (cod , capelin and herring) of the Barents Sea, and how they are directly and indirectly affected by climate, interactions within and among fish stocks, fisheries, and possible effects of oil accidents, and the bio-economic analyses of cod fisheries. I have also worked on seabirds (kittiwake) in the Barents Sea, dynamics of fish in the North Sea, and on production modelling of several ocean areas.

At NIVA, I work with statistical analysis and data curation in a number of projects related to marine biology and oceanography, including collection and analysis of toxicological data for EEA, and collection and analysis of oceanographic data from Ferrybox systems and oceanographic stations.

Until 2000, I studied and worked mainly with terrestrial ecology, a field I am still involved in as president of the board of the foundation Biofokus.

Education

University of Oslo

MSc: Ecology (Univ. of Oslo 1994)
PhD: Landscape ecology of the bush-cricket Decticus verrucivorus (Univ. of Oslo 2000)

Work

Norwegian Institute for Water Research (NIVA), Dept. of Biogeochemistry and Oceanography

Researcher 2012-

Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo

Researcher 2008-2011 (full time) and 2012- (part time)

VISTA (Statoil / Norwegian Academy of Science and Letters)

Post-doc 2006-2007 (information on the VISTA program)

Dept. of zoology, Institute of Biology, University of Oslo

Researcher 2004-2005

Dept. of zoology, Institute of Biology, University of Oslo

Post-doc 2001-2003

Norwegian Institute of Land Inventory

Researcher 1999-2000

Past projects at UiO

Spatiotemporal variability in mortality and growth of fish larvae in the Lofoten-Barents Sea ecosystem (SVIM)

  • Role: Project leader
  • Financed by the Norwegian Research Council
  • Partners: CEES, met.no and Institute of Marine Research

Adaptive management of living marine resources (ADMAR)

  • Role: Work package leader
  • Financed by the Norwegian Research Council
  • Partners: CEES and Institute of Marine Research

Entomological inventory of poorly investigated insect groups in upland and sub-arctic forests

  • Role: Project manager
  • Financed by the Norwegian Biodiversity Centre
  • Partners: BioFokus, University of Tromsø and Norwegian Institute of Nature Research (NINA)

Nordic Centre for the Study of Climate Change Effects on Marine Ecosystems and Resource Economics (NorMER)

  • Role: Partipicant, PhD co-supervisor
  • Financed by the Nordic Council of Ministers
  • Partners: CEES and nine other partners

Combined effects of ocean acidification, climate change and oil related discharges

  • Role: Main partipicant at the Univ. of Oslo
  • Financed by the Norwegian Research Council
  • Partners: International Research Institute of Stavanger and others

Integrated Model System: Risk and Ecosystem Based Management of Arctic waters

  • Role: Main partipicant at the Univ. of Oslo
  • Financed by the Norwegian Research Council
  • Partners: International Research Institute of Stavanger and others

Comparison of Marine Ecosystems of NORWAY and the US II (MENU II)

  • Role: Partipicant
  • Financed by the Norwegian Research Council
  • Partners: Institute of Marine Research and others

Match-mismatching of trophic levels as a structuring force of ecosystems (MICO)

  • Role: Project partipicant
  • Financed by the Norwegian Research Council

The possible role of zooplankton in modulating ecosystem effects of acute oil spills in the Norwegian and Barents Seas (OILPLANK)

  • Role: Project partipicant
  • Financed by the Norwegian Research Council

Long-term effects of oil accidents on the pelagic ecosystem of the Norwegian and Barents Seas (LEO)

  • Role: Project partipicant
  • Financed by the Norwegian Research Council

Effects of Oil on the Pelagic Ecosystem

  • Role: Project partipicant
  • Financed by Statoil

Arctic and sub-Arctic climate system and ecological response to the early 20th century warming

  • Role: Project partipicant
  • Financed by the Norwegian Research Council

Economically and ecologically sustainable fisheries management (MADIMA)

  • Role: Project partipicant
  • Financed by the Norwegian Research Council

Methods for assessing environmental risk for fish from acute oil release

  • Role: Project partipicant
  • Financed by the Norwegian Oil Industry Association

Ecological effects of climate fluctuations (EcoClim)

  • Role: Project partipicant
  • Financed by the Norwegian Research Council
Publications
This list is not regularly updated - for an updated list, see Google Scholar

Rouyer T., Ottersen G., Durant J.M., Hidalgo M., Hjermann D.Ø., Persson J., Stige L.C., and Stenseth N.C. 2011. Shifting dynamic forces in fish stock fluctuations driven by age truncation? Global Change Biology in press (published online, doi:10.1111/j.1365-2486.2011.02443.x).

Hidalgo, M., Gusdal, Y., Dingsør, G.E., Hjermann, D.Ø., Ottersen, G., Stige, L.C., Melsom, A., Stenseth, N.C. 2011. A combination of hydrodynamical and statistical modeling reveals nonstationary climate effects on fish larvae distributions. Proceedings of the Royal Society of London, B in press (published online, doi:10.1098/rspb.2011.0750).

Hjermann, D.Ø., Bogstad, B., Dingsør, G.E., Gjøsæter, H., Ottersen, G., Eikeset, A.M. and Stenseth, N.C. 2010. Trophic interactions affecting a key ecosystem component: a multi-stage analysis of the recruitment of the Barents Sea capelin. Canadian Journal of Fisheries and Aquatic Science 67: 1363-1375.

Diekert F.K., Hjermann D.Ø., Nævdal E. & Stenseth N.C. 2010. Non-cooperative exploitation of multi-cohort fisheries - The role of of gear selectivity in the North-East Arctic cod fishery. Resource and Energy Economics 32: 78-92.

Diekert F.K., Hjermann D.Ø., Nævdal E. & Stenseth N.C. 2010. Spare the Young Fish: Optimal Harvesting Policies for North-East Arctic Cod . Environmental and Resource Economics 47: 455-475.

Durant J.M., Hjermann D.Ø., Frederiksen M., Charrassin J.-B., Le Maho Y., Sabarros P.S., Crawford R.J.M. & Stenseth N.C 2009. Pros and cons of using seabirds as ecological indicators. Climate Research 39: 115-129.

Durant J.M., Hjermann D.Ø., Sabarros P.S. & Stenseth N.C. 2008. Northeast Arctic Cod population persistence in the Lofoten-Barents Sea system under fishing. Ecological Applications 18: 662-669.

Hjermann, D.Ø., Melsom, A., DingsØr, G.E., Durant, J.M., Eikeset, A.M., RØed, L.P., Ottersen, G., Storvik, G. and Stenseth, N.C. 2007. Fish and oil in the Lofoten-Barents Sea system: a synoptic review of the effect of oil spills on fish populations. Marine Ecology Progress Series 339: 283-299.

Durant, J.M., Hjermann, D.Ø., Ottersen, G. and Stenseth, N.C. 2005. Climate and the match or mismatch between predator requirements and resource availability. Climate Research 33: 271-283.

Hjermann, D.Ø., Bogstad, B., Eikeset, A.M., Ottersen, G., GjØsæter, H. and Stenseth, N.C. 2007. Food web dynamics affect Northeast Arctic cod recruitment. Proceedings of the Royal Society of London, B 274:661-669.

Stenseth, N.C., Llope, M., Anadon, R., Ciannelli, L., Chan, K.S., Hjermann, D.Ø., BagØien, E., and Ottersen, G. 2006. Seasonal plankton dynamics along a cross-shelf gradient. Proceedings of the Royal Society of London, B 273:2831-2838.

Ottersen, G., Hjermann, D.Ø., Stenseth, N.C. 2006. Changes in spawning stock structure strengthen the link between climate and recruitment in a heavily fished cod (Gadus morhua) stock. Fisheries Oceanography 15:230-243.

Stenseth, N.C., Mysterud, A., Durant, J.M., Hjermann, D.Ø. and Ottersen, G. 2005. Uniting ecologists into a smooth, tasty and potent blend. Marine Ecology Progress Series 304:289-292.

Durant, J.M., Hjermann, D.Ø., Anker-Nilssen, T., Beaugrand, G., Mysterud, A., Pettorelli, N. and Stenseth, N.C. 2005. Timing and abundance as key mechanisms affecting trophic interactions in variable environments. Ecology Letters 8:952-958

Hjermann, D.Ø., Stenseth, N.C. and Ottersen, G. 2004. Indirect climatic forcing of the Barents Sea capelin: a cohort-effect. Marine Ecology Progress Series 273: 229-238.

Durant J.M., Anker-Nilssen T., Hjermann, D.Ø. & Stenseth N.C. 2004. Regime shifts in the breeding of an Atlantic puffin population. Ecology Letters 7: 388-394.

* Hjermann, D.Ø., Ottersen, G. and Stenseth, N.C. 2004. Competition among fishermen and fish causes the collapse of Barents Sea capelin. Proceedings of the National Academy of Sciences 101: 11679-11684.

Hjermann, D.Ø., Stenseth, N.C. and Ottersen, G. 2004. The population dynamics of North-east Arctic cod through two decades: an analysis based on survey data. Canadian Journal of Fisheries and Aquatic Science 61: 1747-1755.

Colman, J.E., Pedersen, C., Hjermann, D., Holand, Ø., Moe, S., and Reimers, E. 2003. Do wild reindeer exhibit grazing compensation during insect harassment? Journal of Wildlife Management 67:11-19.

Stenseth, N.C., Kittilsen, M.O., Viljugrein, H., Saitoh, T., and Hjermann, D.Ø. 2002. Seasonal forcing on the dynamics of voles in Hokkaido: disentangling the geographic structure of the annual density-dependent structure into ots seasonal components. Proceedings of the Royal Society of London, B 269: 1853-1863.

Colman, J. E., Pedersen, C., Hjermann, D.Ø., Holand, Ø., Moe, S.R., and Reimers, E. 2001. Twenty-four-hour feeding and lying patterns of wild reindeer Rangifer tarandus tarandus in summer. Canadian Journal of Zoology 79: 2168-2175.

Hjermann, D.Ø. 2000. Analysing habitat selection in animals without well-defined home ranges. Ecology 81: 1462-1468.

Mysterud, A., Lian, L.-B., and Hjermann, D. Ø. 1999. Scale-dependent trade-offs in foraging by European roe deer (Capreolus capreolus) during winter. Canadian Journal of Zoology 77: 1486-1493.

Hjermann, D.Ø. and Ims, R.A. 1996. Landscape ecology of the wart-biter Decticus verrucivorus in a patchy landscape. Journal of Animal Ecology 65: 768-780.

Book chapters

Ciannelli, L., Hjermann, D. Ø., Lehodey, P., Ottersen, G., Duffy-Anderson, J. T. and Stenseth, N. C. 2005. Climate forcing, food-web structure, and community dynamics in pelagic marine ecosystems. In: Aquatic Food Webs: An Ecosystem Approach (edited by A. Belgrano, U. M. Scharler, J. Dunne and R. E. Ulanowicz). Oxford University Press.

Ims, R.A. and Hjermann, D.Ø. 2001. Condition-dependent dispersal. In: J. Clobert, E. Danchin, A. A. Dhondt and J. D. Nichols: Dispersal. Oxford University Press.

Hjermann, D. Ø. 2009. Metapopulation Theory. In: Gillespie, R.G. and D. Clague (eds) Encyclopedia of Islands. University of California Press, Berkeley, CA

Others

Brude, O.W., Hjermann, D., Skogen, M., VikebØ, F., Sverdrup, L., Rudberg, A., Persson, M., Bohne-Kiersem, A. 2008. Metodikk for miljørisiko på fisk ved akutte oljeutslipp (Methodology for assessing environmenal risk of acute oil release). Det Norske Veritas Report 2007-2075:1-87

Store Norske Leksikon [The main Norwegian Encyclopedia] - author of 80+ articles (responsible for the field Ecology)

Several proceedings papers, papers in Norwegian journals, reports etc.

References
Available on request