Katja Enberg
Arbeider med
Please check out our recent papers:
Enberg K., Jørgensen, C., Dunlop, E.S., Varpe, Ø., Boukal, D.S., Baulier, L., Eliassen, S. and Heino, M. 2012. Fishing-induced evolution of growth: concepts, mechanisms, and the empirical evidence. Marine Ecology, 33: 1-25. onlinelibrary.wiley.com/doi/10.1111/j.1439-0485.2011.00460.x/full
Abstract
The interest in fishing-induced life-history evolution has been growing in the last decade, in part because of the increasing number of studies suggesting evolutionary changes in life-history traits, and the potential ecological and economic consequences these changes may have. Among the traits that could evolve in response to fishing, growth has lately received attention. However, critical reading of the literature on growth evolution in fish reveals conceptual confusion about the nature of ‘growth’ itself as an evolving trait, and about the different ways fishing can affect growth and size-at-age of fish, both on ecological and on evolutionary time-scales. It is important to separate the advantages of being big and the costs of growing to a large size, particularly when studying life-history evolution. In this review, we explore the selection pressures on growth and the resultant evolution of growth from a mechanistic viewpoint. We define important concepts and outline the processes that must be accounted for before observed phenotypic changes can be ascribed to growth evolution. When listing traits that could be traded-off with growth rate, we group the mechanisms into those affecting resource acquisition and those governing resource allocation. We summarize potential effects of fishing on traits related to growth and discuss methods for detecting evolution of growth. We also challenge the prevailing expectation that fishing-induced evolution should always lead to slower growth.
Keywords:Fisheries-induced evolution; fishing-induced evolution; growth; maturation; reproductive investment; resource acquisition; resource allocation; size-at-age; trade-offs
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Myrseth, J., Enberg, K., Heino, M. and Fiksen, Ø. 2011. Do accurate stock estimates increase harvest and reduce variability in fisheries yields? Natural Resource Modeling 24: 222–241. http://onlinelibrary.wiley.com/doi/10.1111/j.1939-7445.2011.00089.x/abstract
Abstract: Fisheries managers normally make decisions based on stock abundance estimates subject to process, observation, and model uncertainties. Considerable effort is invested in gathering information about stock size to decrease these uncertainties. However, few studies have evaluated benefits from collecting such information in terms of yield and stability of annual harvest. Here, we develop a strategic age-structured population model for a long-lived fish with stochastic recruitment, resembling the Norwegian spring-spawning herring (NSSH, Clupea harengus L.). We evaluate how uncertainties in population estimates influence annual yield, spawning stock biomass (SSB), and variation in annual harvest, using both the proportional threshold harvesting (PTH) and the current harvest control rule for NSSH as harvest strategies. Results show that the consequences of a biased estimate are sensitive to the harvest strategy employed. If the harvest strategy is suitably chosen, the benefits of accurate information are low, and less information about the stock is necessary to maintain high average yield. Reduced harvest intensity effectively removes the need for accurate stock estimates. PTH (a variant of the constant escapement strategy) with low harvest ratio and the current NSSH harvest control rule both provide remarkable stability in yield and SSB. However, decreased uncertainty will often decrease year-to-year variation in harvest and the frequency of fishing moratoria.
Keywords: Age-structured model; management strategy evaluation; multiple uncertainty; Norwegian spring-spawning herring; optimal harvesting
Curriculum Vitae
Last updated on 16.06. 2011
Katja Enberg PhD
Phone: +47 5523 8692
Mobile: +47 4100 6368
e-mail: katja.enberg@imr.no
Studies and degrees:
2. 6. 2005 PhD, Faculty of Biosciences, Department of Biological and Environmental Sciences, University of Helsinki. Major in morphological-ecological zoology, graded 3/3.
22.12. 2000 MSc, Faculty of Science, Department of Ecology and Systematics, University of Helsinki. Major in morphological-ecological zoology, graded 3/3.
Recent positions:
4/2010- Researcher at Institute of Marine Research, Bergen, Norway
12/2007-3/2010 Researcher at the University of Bergen
4/2007-11/2007 Research scholar at the Institute of Marine Research / University of Bergen, Norway
4/2006-3/2007 Postdoctoral research scholar in the Institute for Applied Systems Analysis, Laxenburg, Austria, in the EU Specific Targeted Research Project “Understanding the Mechanisms of Stock Recovery” (UNCOVER)
Publications:
Refereed articles in peer-reviewed international journals
- Enberg K., C. Jørgensen, E.S. Dunlop, Ø. Varpe, D.S. Boukal, L. Baulier, S. Eliassen and M. Heino. 2012. Fishing-induced evolution of growth: concepts, mechanisms, and the empirical evidence. Marine Ecology, 33: 1-25. onlinelibrary.wiley.com/doi/10.1111/j.1439-0485.2011.00460.x/full
- Myrseth, J., K. Enberg, M. Heino, and Ø. Fiksen. 2011. Do accurate stock estimates increase harvest and reduce variability in fisheries yields? Natural Resource Modeling 24: 222–241. DOI: 10.1111/j.1939-7445.2011.00089.x
- Enberg, K., C. Jørgensen, and M. Mangel. 2010. Fishing-induced evolution and changing reproductive biology of fish: the evolution of steepness. Canadian Journal of Fisheries and Aquatic Sciences 67: 1708–1719.
- Dickey-Collas, M., R.D.M. Nash, T. Brunel, C.J.G. van Damme, C.T. Marshall, M.R. Payne, A. Corten, A.J. Geffen, M.A. Peck, E.M.C. Hatfield, N.T. Hintzen, K. Enberg, L.T. Kell and E.J. Simmonds 2010. Lessons learned from stock collapse and recovery of North Sea herring: a review. ICES Journal of Marine Science, 67(9): 1875-1886.
- Enberg, K., C. Jørgensen, E.S. Dunlop, M. Heino, and U. Dieckmann. 2009. Implications of fisheries-induced evolution for stock rebuilding and recovery. Evolutionary Applications 2: 394-414.
- Tiira, K., A. Laurila, K. Enberg, and J. Piironen. 2009. Short-term dominance: stability and consequences for subsequent growth. Journal of Fish Biology 74: 2374-2385.
- Heino, M., L. Baulier, D.S. Boukal, E.S. Dunlop, S. Eliassen, K. Enberg, C.Jørgensen, and Ø. Varpe. 2008. Evolution of growth in Gulf of St Lawrence cod? Proceedings of the Royal Society B-Biological Sciences 275: 1111-1112.
- Jørgensen, C., K. Enberg, E.S. Dunlop, R. Arlinghaus, D.S. Boukal, K. Brander, B. Ernande, A. Gårdmark, F. Johnston, S. Matsumura, H. Pardoe, K. Raab, A. Silva, A. Vainikka, U. Dieckmann, M. Heino, and A.D. Rijnsdorp. 2007. Managing evolving fish stocks. Science 318: 1247-1248.
- Enberg, K., M.S. Fowler, and E. Ranta. 2006. The impacts of different management strategies and environmental forcing in ecological communities. Proceedings of the Royal Society B-Biological Sciences 273: 2491-2499.
- Tiira, K., A. Laurila, K. Enberg, J. Piironen, S. Aikio, E. Ranta, and C.R. Primmer. 2006. Do dominants have higher heterozygosity? Social status and genetic variation in brown trout, Salmo trutta. Behavioral Ecology and Sociobiology 59: 657-665.
- Enberg, K. 2005. Benefits of threshold strategies and age-selective harvesting in a fluctuating fish stock of Norwegian spring spawning herring Clupea harengus. Marine Ecology-Progress Series 298: 277-286.
- Kaitala, V., K. Enberg, and E. Ranta. 2004. Fish harvesting, marine reserves, and distribution of individuals over space. Biological Letters 41: 3-10.
- Gårdmark, A., K. Enberg, J. Ripa, J. Laakso, and V. Kaitala. 2003. The ecology of recovery. Annales Zoologici Fennici 40: 131-144.
- Kaitala, V., N. Jonzén, and K. Enberg. 2003. Harvesting strategies in a fish stock dominated by low-frequency variability: the Norwegian spring-spawning herring (Clupea harengus). Marine Resource Economics 18: 263-274.
- Lorenzen, K. and K. Enberg. 2002. Density-dependent growth as a key mechanism in the regulation of fish populations: evidence from among-population comparisons. Proceedings of the Royal Society of London Series B-Biological Sciences 269: 49-54.
- Lahti, K., A. Laurila, K. Enberg, and J. Piironen. 2001. Variation in aggressive behaviour and growth rate between populations and migratory forms in the brown trout, Salmo trutta. Animal Behaviour 62: 935-944.
Other contributions in international peer-reviewed journals
- Dunlop, E.S., K. Enberg, C. Jørgensen, and M. Heino. 2009. Toward Darwinian fisheries management. Evolutionary Applications 2: 245-259.
- Jørgensen, C., K. Enberg, E.S. Dunlop, R. Arlinghaus, D.S. Boukal, K. Brander, B. Ernande, A. Gårdmark, F. Johnston, S. Matsumura, H. Pardoe, K. Raab, A. Silva, A. Vainikka, U. Dieckmann, M. Heino, and A.D. Rijnsdorp. 2008. The role of fisheries-induced evolution – response. Science 320: 48-50.
Book chapters
- Heino, M. and K. Enberg. 2008. Sustainable use of populations and overexploitation. In Encyclopedia of life sciences. John Wiley & Sons, Chichester, UK.
- Enberg, K., E.S. Dunlop, and C. Jørgensen. 2008. Fish growth. In Encyclopedia of Ecology, Edited by S.E. Jørgensen and B.D. Fath. Elsevier, Oxford. Pp 1564-1572.
- Lilly, G.R., K. Wieland, B. Rotschild, S. Sundby, K. Drinkwater, K. Brander, G. Ottersen, J. Carscadden, G. Stenson, G. Chouinard, D. Swain, N. Daan, K. Enberg, M. Hammill, A. Rosing-Asvid, H. Svedäng, and A. Vázquez. 2008. Decline and recovery of Atlantic cod (Gadus morhua) stocks throughout the North Atlantic. In Resiliency of gadid stocks to fishing and climate change, Edited by G.H. Kruse, K. Drinkwater, J.N. Ianelli, J.S. Link, D.L. Stram, V. Wespestad, and D. Woodby. Alaska Sea Grant College Program, Fairbanks, Alaska. Pp 39-66.
- Enberg, K. and V. Kaitala. 2003. Managed extinctions in fisheries. In Ecosystems and sustainable development IV, Edited by E. Tiezzi, C.A. Brebbia, and J.L. Usó. WIT Press, Southampton, UK. Pp 981-987.
Conference Proceedings, theses, and reports
- P. Arneberg, O. Korneev, O. Titov, J.E. Stiansen, A. Filin, J.R. Hansen, Å. Høines, and S. Marasaev. 2009. Joint Norwegian-Russian environmental status 2008 report on the Barents Sea ecosystem: Part I - short version (Contributor) IMR/PINRO Joint Report Series 2009/2.
- ICES. 2009. Report of the Study Group on Fisheries Induced Adaptive Change (SGFIAC), 31 March-2 April 2009, ICES Headquarters, Copenhagen
ICES CM 2009/RMC: 03. - J.E. Stiansen, O. Korneev, O. Titov, P. Arneberg, A. Filin, J.R. Hansen, Å. Høines, and S. Marasaev. 2009. Joint Norwegian-Russian environmental status report 2008: Report on the Barents Sea ecosystem; Part II - complete report (Contributor) IMR/PINRO Joint Report Series 2009/3.
- ICES. 2008. Report of the Study Group on Fisheries Induced Adaptive Change (SGFIAC), 21-25 January 2008, ICES, Copenhagen, Denmark
ICES CM 2008/RMC: 01. - Arlinghaus, R., D.S. Boukal, U. Dieckmann, E.S. Dunlop, K. Enberg, B. Ernande, A. Gårdmark, M. Heino, F. Johnston, C. Jørgensen, S. Matsumura, H. Pardoe, K. Raab, A.D. Rijnsdorp, A. Silva, and A. Vainikka. 2007. Report of the ICES Study Group on Fisheries Induced Adaptive Change (SGFIAC) 26 February-2 March 2007, Lisbon, Portugal.
- Enberg, K. and M. Heino. 2007. Fisheries-induced life history changes in herring ICES CM 2007 E: 23.
- Brander, K., P. Budgell, J. Carscadden, G. Chouinard, N. Daan, K. Drinkwater, K. Enberg, M. Hammill, G.R. Lilly, A. Lucas, G. Ottersen, A. Rosing-Asvid, B. Rotschild, G. Stenson, S. Sundby, H. Svedäng, D. Swain, A. Vázquez, and K. Wieland. 2006. Report of the workshop on the decline and recovery of cod stocks throughout the North Atlantic, including trophodynamic effects (WKDRCS) 9-12 May 2006, St. John's, Canada.
- Enberg, K., E.S. Dunlop, M. Heino, and U. Dieckmann. 2006. Ecological and evolutionary recovery of exploited fish stocks. ICES CM 2006 H: 18.
- Enberg, K. 2005. Sustainable harvesting in variable environments. PhD thesis, University of Helsinki, Faculty of Biosciences, Department of Biological and Environmental Sciences. ISBN 952-91-8598-7.
