Blar i Brage IMR på forfatter "Enberg, Katja"
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Adaptive management of living marine resources by integrating different data sources and key ecological processes (ADMAR): A joint effort by IMR and CEES
Handegard, Nils Olav; Stenseth, Nils Christian; Dankel, Dorothy Jane; Durant, Joël M.; Eikeset, Anne Maria; Enberg, Katja; Hjermann, Dag Ø.; Huse, Geir; Pennington, Michael; Skern-Mauritzen, Mette; Stige, Leif Christian; Subbey, Samuel; Vølstad, Jon Helge (ICES CM documents;2010/R:26 Poster;, Working paper, 2010-09) -
Benefits of threshold strategies and age-selective harvesting in a fluctuating fish stock of Norwegian spring spawning herring Clupea harengus
Enberg, Katja (Journal article; Peer reviewed, 2005-08-15)The current state of the world’s fisheries resources requires further investigation into the means and methods for sustainable use of fish stocks. In this study, I assess the performance of different harvesting strategies ... -
Can less be more? Effects of reduced frequency of surveys andstock assessments
Zimmermann, Fabian; Enberg, Katja (Journal article; Peer reviewed, 2016-08-07)Uncertain and inaccurate estimates are a prevailing problem in stock assessment, despite increasingly sophisticated estimation methods and substantial usage of scientific and financial resources. Annual scientific surveys ... -
Common trends in recruitment dynamics of north-east Atlantic fish stocks and their links to environment, ecology and management
Zimmermann, Fabian; Claireaux, Marion; Enberg, Katja (Journal article; Peer reviewed, 2019)Recruitment dynamics are challenging to assess or predict because of the many underlying drivers that vary in their relevance over time and space. Stock size, demographic and trait composition, condition and distribution ... -
Decline and Recovery of Atlantic Cod (Gadus morhua) Stocks throughout the North Atlantic
Lilly, George R.; Wieland, Kai; Rothschild, Brian J.; Sundby, Svein; Drinkwater, Ken; Brander, Keith; Ottersen, Geir; Carscadden, James E.; Stenson, Garry B.; Chouinard, Ghislain A.; Swain, Douglas P.; Daan, N.; Enberg, Katja; Hammill, Michael O.; Rosing-Asvid, Aqqalu; Svedäng, Henrik; Vázquez, Antonio (Chapter, 2008)Many stocks of Atlantic cod (Gadus morhua) on both sides of the North Atlantic are currently at much reduced levels of biomass, but this situation is not in all instances the result of long, continuous decline. Most Northwest ... -
Decline and Recovery of Atlantic Cod (Gadus morhua) Stocks throughout the North Atlantic
Lilly, George R.; Wieland, Kai; Rothschild, Brian J.; Sundby, Svein; Drinkwater, Ken; Brander, Keith; Ottersen, Geir; Carscadden, James E.; Stenson, Garry B.; Chouinard, Ghislain A.; Swain, Douglas P.; Daan, N.; Enberg, Katja; Hammill, Michael O.; Rosing-Asvid, Aqqalu; Svedäng, Henrik; Vázquez, Antonio (Chapter, 2008)Many stocks of Atlantic cod (Gadus morhua) on both sides of the North Atlantic are currently at much reduced levels of biomass, but this situation is not in all instances the result of long, continuous decline. Most Northwest ... -
Density-dependent growth as a key mechanism in the regulation of sh populations: evidence from among-population comparisons
Lorenzen, Kai; Enberg, Katja (Journal article; Peer reviewed, 2001-11-30)It is generally assumed that fish populations are regulated primarily in the juvenile (pre-recruit) phase of the life cycle, although density dependence in growth and reproductive parameters within the recruited phase has ... -
Density-independent mortality at early life stages increases the probability of overlooking an underlying stock-recruitment relationship
Zimmermann, Fabian; Enberg, Katja; Mangel, Marc (Peer reviewed; Journal article, 2021)Abstract Beverton and Holt’s (1957) monograph contributed a widely used stock–recruitment relationship (BH-SRR) to fisheries science. However, because of variation around a presumed relationship between spawning biomass ... -
Do accurate stock estimates increase harvest and reduce variability in fisheries yields?
Myrseth, Johanna; Enberg, Katja; Heino, Mikko; Fiksen, Øyvind (Journal article; Peer reviewed, 2011-03-22)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 ... -
Drivers of the summer-distribution of Northeast Atlantic mackerel (Scomber scombrus) in the Nordic Seas from 2011 to 2017; a Bayesian hierarchical modelling approach.
Nikolioudakis, Nikolaos; Skaug, Hans J.; Olafsdottir, Anna H.; Jansen, Teunis; Jacobsen, Jan Arge; Enberg, Katja (Journal article; Peer reviewed, 2019)Identifying factors that are statistically correlated with the geographical distribution dynamics of a species can facilitate our understanding of causal physiological and ecological relationships. Northeast Atlantic (NEA) ... -
Ecological and Evolutionary Recovery of Exploited Fish Stocks
Enberg, Katja; Dunlop, Erin S.; Heino, Mikko; Dieckmann, Ulf (ICES CM documents, Working paper, 2006) -
The ecology of recovery
Gårdmark, Anna; Enberg, Katja; Ripa, Jörgen; Laakso, Jouni; Kaitala, Veijo (Journal article; Peer reviewed, 2003-04-30)The current high rate of population declines and attempts to `manage' their recovery, call for a better understanding of recovery dynamics of populations. In many cases, recovery of a population may primarily be determined ... -
Eight decades of adaptive changes in herring reproductive investment: the joint effect of environment and exploitation
Claireaux, Marion; dos Santos Schmidt, Thassya Christina; Olsen, Esben Moland; Slotte, Aril; Varpe, Øystein; Heino, Mikko Petteri; Enberg, Katja (Peer reviewed; Journal article, 2020)Reproductive investment is a central trait for population dynamics and productivity. Fishing and environmental variations are major drivers affecting population structure, dynamics, and adaptation of life-history and ... -
Environmental drivers of herring growth and how the perception shifts with time series length
Claireaux, Marion; Zimmermann, Fabian; Ernande, Bruno; Heino, Mikko Petteri; Enberg, Katja (Peer reviewed; Journal article, 2022)Growth is a key component of population dynamics and, thus, fisheries management, yet drivers of its variations are often poorly understood. Using individual data collected over 80 years, we explored how environmental ... -
Environmental stressors may cause unpredicted, notably lagged life-history responses in adults of the planktivorous Atlantic herring
dos Santos Schmidt, Thassya Christina; Devine, Jennifer Ann; Slotte, Aril; Claireaux, Marion; Johannessen, A; Enberg, Katja; Oskarsson, Gudmundur; Kennedy, James; Kurita, Yutaka; Kjesbu, Olav Sigurd (Peer reviewed; Journal article, 2020)Here we challenge traditional views on the direction of change in teleost body condition and reproductive traits in response to abiotic and biotic factors by studying the data-rich, planktivorous Norwegian spring-spawning ... -
Evolution of growth in Gulf of St Lawrence cod?
Heino, Mikko; Baulier, Loïc; Boukal, David S.; Dunlop, Erin S.; Eliassen, Sigrunn; Enberg, Katja; Jørgensen, Christian; Varpe, Øystein (Journal article; Peer reviewed, 2008-06-22)Fishing is often size selective such that the likelihood of capture increases with body size. It has therefore been postulated that fishing could favour evolution of slower growth because smaller size would reduce exposure ... -
Evolutionary effects of fishing gear on foraging behavior and life-history traits
Claireaux, Marion; Jørgensen, Christian; Enberg, Katja (Journal article; Peer reviewed, 2018)Fishing gears are designed to exploit the natural behaviors of fish, and the concern that fishing may cause evolution of behavioral traits has been receiving increasing attention. The first intuitive expectation is that ... -
Fine-scale diet data reveal spatial variation in predator–prey interactions in Norwegian fjords
Tengvall, Jessica; Søvik, Guldborg; Enberg, Katja; Lindstrøm, Ulf Ove; Strand, Mette; Pedersen, Torstein; Strand, Hans Kristian; Zimmermann, Fabian (Peer reviewed; Journal article, 2024)Predator–prey interactions in time and space determine stock productivity, making them an important consideration when managing marine resources, rebuilding stocks or considering reopening a fishery. We analysed fine-scale ... -
Fine-scale diet data reveals spatial variation in predator-prey interactions in Norwegian fjords
Tengvall, Jessica; Søvik, Guldborg; Enberg, Katja; Lindstrøm, Ulf; Strand, Mette; Pedersen, Torstein; Strand, Hans Kristian; Zimmermann, Fabian (Dataset, 2024)We explored the diet composition of higher-trophic demersal fish (e.g., Atlantic cod) in three large fjord ecosystems in northern Norway, using spatially and taxonomically highly resolved data and geostatistical modelling. ... -
Fish harvesting, marine reserves, and distribution of individuals over space
Kaitala, Veijo; Enberg, Katja; Ranta, Esa (Journal article; Peer reviewed, 2004-08-05)We analysed exploitation of populations that are partly protected in a marine harvest refuge to prevent their over-harvesting in the remaining unprotected area. We carried out our analysis by introducing the model of ideal ...