Blar i Bergen Open Research Archive på forfatter "Jørgensen, Christian"
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Bioeconomic consequences of fishing-induced evolution: a model predicts limited impact on net present value
Zimmermann, Fabian; Jørgensen, Christian (Peer reviewed; Journal article, 2015-04)Fishing reduces stock size and shifts demographics, and selective mortality may also lead to evolutionary changes. Previous studies suggest that traits may change evolutionarily because of fishing on decadal time scales. ... -
Body size adaptions under climate change: Zooplankton community more important than temperature or food abundance in model of a zooplanktivorous fish
Ljungström, Anna Jeja Gabriella; Claireaux, Marion; Fiksen, Øyvind; Jørgensen, Christian (Journal article; Peer reviewed, 2020)One of the most well-studied biogeographic patterns is increasing body size with latitude, and recent body size declines in marine and terrestrial organisms have received growing attention. Spatial and temporal variation ... -
Climate change in fish: effects of respiratory constraints on optimal life history and behaviour
Holt, Rebecca; Jørgensen, Christian (Peer reviewed; Journal article, 2015)The difference between maximum metabolic rate and standard metabolic rate is referred to as aerobic scope, and because it constrains performance it is suggested to constitute a key limiting process prescribing how fish may ... -
Climate warming causes life-history evolution in a model for Atlantic cod (Gadus morhua)
Holt, Rebecca E.; Jørgensen, Christian (Peer reviewed; Journal article, 2014)Climate change influences the marine environment, with ocean warming being the foremost driving factor governing changes in the physiology and ecology of fish. At the individual level, increasing temperature influences ... -
Dying from the lesser of three evils: facilitation and non-consumptive effects emerge in a model with multiple predators
Fouzai, Nadia; Opdal, Anders Frugård; Jørgensen, Christian; Fiksen, Øyvind (Peer reviewed; Journal article, 2019)Prey modify their behaviour to avoid predation, but dilemmas arise when predators vary in hunting style. Behaviours that successfully evade one predator sometimes facilitate exposure to another predator, forcing the prey ... -
Effects of copepod size on fish growth: A model based on data for North Sea sandeel
Van Deurs, Mikael; Jørgensen, Christian; Fiksen, Øyvind (Peer reviewed; Journal article, 2015-02-03)In productive marine off-shore ecosystems, the flow of energy from zooplankton to large predators is channeled through a few species of short-lived, highly abundant schooling planktivorous fish. There are indications that ... -
Effects of temperature and food availability on larval cod survival: A model for behaviour in vertical gradients
Fouzai, Nadia; Opdal, Anders Frugård; Jørgensen, Christian; Fiksen, Øyvind (Peer reviewed; Journal article, 2015-06-08)Recruitment success in living marine resources is variable due to high survival variability of early life stages. Improving our understanding of how environmental and ecological factors mechanistically interact and influence ... -
The emotion system promotes diversity and evolvability
Giske, Jarl; Eliassen, Sigrunn; Fiksen, Øyvind; Jakobsen, Per Johan; Aksnes, Dag Lorents; Mangel, Marc; Jørgensen, Christian (Peer reviewed; Journal article, 2014-08-06)Studies on the relationship between the optimal phenotype and its environment have had limited focus on genotype-to-phenotype pathways and their evolutionary consequences. Here, we study how multi-layered trait architecture ... -
Evolutionary effects of fishing gear on foraging behavior and life-history traits
Claireaux, Marion; Jørgensen, Christian; Enberg, Katja (Peer reviewed; Journal article, 2018-11)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 ... -
Extra-pair mating and evolution of cooperative neighbourhoods
Eliassen, Sigrunn; Jørgensen, Christian (Peer reviewed; Journal article, 2014-07-02)A striking but unexplained pattern in biology is the promiscuous mating behaviour in socially monogamous species. Although females commonly solicit extra-pair copulations, the adaptive reason has remained elusive. We use ... -
Fishing for answers
Jørgensen, Christian; Enberg, Katja (Journal article, 2019) -
From sensing to emergent adaptations: Modelling the proximate architecture for decision-making
Eliassen, Sigrunn; Andersen, Bjørn Snorre; Jørgensen, Christian; Giske, Jarl (Peer reviewed; Journal article, 2016-04)During the past 50 years, evolutionary theory for animal behaviour has branched into different methodological frameworks focussing on age-, state-, density-, and frequency-dependent processes. These approaches have led to ... -
Gender gaps in the performance of Norwegian biology students: the roles of test anxiety and science confidence
Cotner, Sehoya Harris; Jeno, Lucas Matias; Walker, J. D; Jørgensen, Christian; Vandvik, Vigdis (Journal article; Peer reviewed, 2020)Background: Understanding student motivational factors such as test anxiety and science confidence is important for increasing retention in science, technology, engineering, and math (STEM), especially for underrepresented ... -
Hormones as adaptive control systems in juvenile fish
Weidner, Jacqueline; Jensen, Camilla Håkonsrud; Giske, Jarl; Eliassen, Sigrunn; Jørgensen, Christian (Peer reviewed; Journal article, 2020-02-17)Growth is an important theme in biology. Physiologists often relate growth rates to hormonal control of essential processes. Ecologists often study growth as a function of gradients or combinations of environmental factors. ... -
Life-history implications of the allometric scaling of growth
Boukal, David S.; Dieckmann, Ulf; Enberg, Katja; Heino, Mikko Petteri; Jørgensen, Christian (Peer reviewed; Journal article, 2014-10-21)Several phenomenological descriptions, such as the von Bertalanffy growth model, have been widely used to describe size-at-age and individual growth across a diverse range of organisms. However, for modelling life histories, ... -
Light comfort zone in a mesopelagic fish emerges from adaptive behaviour along a latitudinal gradient
Langbehn, Tom; Aksnes, Dag Lorents; Kaartvedt, Stein; Fiksen, Øyvind; Jørgensen, Christian (Peer reviewed; Journal article, 2019)Throughout the oceans, small fish and other micronekton migrate between daytime depths of several hundred meters and near-surface waters at night. These diel vertical migrations of mesopelagic organisms structure pelagic ... -
Long-term change in a behavioural trait: truncated spawning distribution and demography in Northeast Arctic cod
Opdal, Anders Frugård; Jørgensen, Christian (Peer reviewed; Journal article, 2015-04)Harvesting may be a potent driver of demographic change and contemporary evolution, which both may have great impacts on animal populations. Research has focused on changes in phenotypic traits that are easily quantifiable ... -
Modelling and interpreting fish bioenergetics: a role for behaviour, life-history traits and survival trade-offs
Jørgensen, Christian; Enberg, Katja; Mangel, Marc (Peer reviewed; Journal article, 2016-01)Bioenergetics is used as the mechanistic foundation of many models of fishes. As the context of a model gradually extends beyond pure bioenergetics to include behaviour, life-history traits and function and performance of ... -
Natural mortality: Its ecology, how it shapes fish life histories, and why it may be increased by fishing
Jørgensen, Christian; Holt, Rebecca (Peer reviewed; Journal article, 2013-01)A stronger focus on natural mortality may be required to better understand contemporary changes in fish life histories and behaviour and their responses to anthropogenic drivers. Firstly, natural mortality is the selection ... -
Parent-offspring conflict over reproductive timing: ecological dynamics far away and at other times may explain spawning variability in Pacific herring
Ljungström, Anna Jeja Gabriella; Francis, Tessa; Mangel, Marc; Jørgensen, Christian (Peer reviewed; Journal article, 2019)Timing of reproduction may be of crucial importance for fitness, particularly in environments that vary seasonally in food availability or predation risk. However, for animals with spatially separated feeding and breeding ...