Blar i NTNU Open på forfatter "Einum, Sigurd"
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Evolutionary change in metabolic rate of Daphnia pulicaria following invasion by the predator Bythotrephes longimanus
Rani, Varsha; Burton, Tim; Walsh, Matthew; Einum, Sigurd (Peer reviewed; Journal article, 2022)Metabolic rate is a trait that may evolve in response to the direct and indirect effects of predator-induced mortality. Predators may indirectly alter selection by lowering prey densities and increasing resource availability ... -
Evolutionary change in metabolism of Daphnia pulicaria in response to the invasive predator Bythotrephes longimanus
Rani, Varsha (Master thesis, 2021)Invasive predators have been identified as one of several threats to global biodiversity. This makes it necessary to understand their potential lethal and non-lethal impacts on native species, communities, and ecosystems. ... -
Genetic and environmental effects on the scaling of metabolic rate with body size
Fossen, Erlend Ignacio Fleck; Pelabon, Christophe; Einum, Sigurd (Peer reviewed; Journal article, 2019)Metabolic rate (MR) often scales with body mass (BM) following a power function of the form MR=aBMb, where log(a) is the allometric intercept and b is the allometric exponent (i.e. slope on a log–log scale). The variational ... -
Genetic Variation in Metabolic Rate and Correlations with Other Energy Budget Components and Life History in Daphnia magna
Einum, Sigurd; Fossen, Erlend Ignacio Fleck; Parry, Victor; Pelabon, Christophe (Peer reviewed; Journal article, 2019)Much is known about the genetic variance in certain components of metabolism, most notably resting and maximum metabolic rate. This is in stark contrast to the lack of information on genetic variance in the metabolic rate ... -
Gross Growth Efficiency of Daphnia magna:Genetic Variance and Effects of Temperature
Parry, Victor (Master thesis, 2017)Gross Growth Efficiency (GGE) is defined as the ratio between Somatic Growth Rate (SGR) and food consumption, and hence represents the quantity of food eaten that is converted to body mass. SGR correlates with intrinsic ... -
Growth and Movement in Brown Trout (Salmo trutta) in two Norwegian Rivers
Skjellevik, Stine Marie (Master thesis, 2012)In the present study, using stream-dwelling brown trout (Salmo trutta) as a model species, movement through the summer and autumn in two large Norwegian rivers, River Glomma and River Gudbrandsdalslågen, was observed. ... -
Historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets
Finstad, Anders Gravbrøt; Sættem, Leif Magnus; Einum, Sigurd (Journal article; Peer reviewed, 2013)Spatial distribution of spawning may have important ramifications for population dynamics in species where early life stages suffer from low mobility and high density-dependent mortality. Here, we use time series of spatial ... -
How to quantify thermal acclimation capacity?
Einum, Sigurd; Ratikainen, Irja Ida; Wright, Jonathan; Pelabon, Christophe; Bech, Claus; Jutfelt, Fredrik; Stawski, Clare; Burton, Tim (Peer reviewed; Journal article, 2019)The capacity of organisms to acclimate will influence their ability to cope with ongoing global changes in thermal regimes. Here we highlight methodological issues associated with recent attempts to quantify variation in ... -
Impact of whitefish on Cladocera communities
Eid, Simon Ormestad (Master thesis, 2019)Introduserte arter har blitt vist å ha effekter på lokal populasjoner både i eksperimenter og i studier av økosystemer. For å kunne ivareta biodiversitet og økosystemtjenester er økt forståelse av menneskelig påvirkning ... -
Inferring temperature adaptation from thermal performance curves of somatic growth rate: The importance of growth measurements and mortality
Einum, Sigurd; Bartuseviciute, Vitalija; Fossen, Erlend Ignacio Fleck; Pelabon, Christophe (Peer reviewed; Journal article, 2022)When comparing somatic growth thermal performance curves (TPCs), higher somatic growth across experimental temperatures is often observed for populations originating from colder environments. Such countergradient variation ... -
Insights into the quantification and reporting of model-related uncertainty across different disciplines
Simmonds, Emily Grace; Dunn-Sigouin, Etienne; Adjei, Kwaku Peprah; Andersen, Christoffer Wold; Aspheim, Janne Cathrin Hetle; Battistin, Claudia; Bulso, Nicola; Christensen, Hannah M.; Cretois, Benjamin; Cubero, Ryan John Abat; Davidovich, Ivan Andres; Dickel, Lisa; Dunn, Benjamin Adric; Dyrstad, Karin; Einum, Sigurd; Giglio, Donata; Gjerløw, Haakon; Godefroidt, Amélie; González-Gil, Ricardo; Gonzalo Cogno, Soledad; Große, Fabian; Halloran, Paul; Jensen, Mari Fjalstad; Kennedy, John James; Langsæther, Peter Egge; Laverick, Jack H; Lederberger, Debora; Li, Camille; Mandeville, Elizabeth G; Mandeville, Caitlin; Moe, Espen; Schröder, Tobias Navarro; Nunan, David; Sicacha-Parada, Jorge; Simpson, Melanie Rae; Skarstein, Emma Sofie; Spensberger, Clemens; Stevens, Richard; Subramanian, Aneesh C.; Svendsen, Lea; Theisen, Ole Magnus; Watret, Connor; O'Hara, Robert B. (Peer reviewed; Journal article, 2022)Quantifying uncertainty associated with our models is the only way we can express how much we know about any phenomenon. Incomplete consideration of model-based uncertainties can lead to overstated conclusions with real-world ... -
Interactions between local population density and limited habitat resources determine movements of juvenile Atlantic salmon
Teichert, Maxim; Foldvik, Anders; Einum, Sigurd; Finstad, Anders Gravbrøt; Forseth, Torbjørn; Ugedal, Ola (Journal article; Peer reviewed, 2017)Competition for limited resources and the resulting density-dependent processes are key factors in driving stream salmonid population dynamics. Here we test for the combined effects of density and shelter availability on ... -
Interactive Effects of Inorganic Mercury and Temperature on Production of Resting Eggs and Population Dynamics in Daphnia magna
Simonsen, Ane (Master thesis, 2018)Freshwater ecosystems are particularly vulnerable to the effects of climate change. In addition to the predicted increase in global surface temperatures, expected change in patterns of precipitation and wind can significantly ... -
Is there genetic variation in the response to competition intensity in juvenile brown trout Salmo trutta?
Robertsen, Grethe; Kvingedal, Eli; Einum, Sigurd (Journal article; Peer reviewed, 2011)Effects of intraspecific competition intensities on the relative performance (growth and movement) of juvenile brown trout Salmo trutta originating from nine different families were tested in tank experiments and in ... -
Is there plasticity in developmental instability? The effect of daily thermal fluctuations in an ectotherm
Kielland, Øystein Nordeide; Bech, Claus; Einum, Sigurd (Journal article; Peer reviewed, 2017)Diversified bet‐hedging (DBH) by production of within‐genotype phenotypic variance may evolve to maximize fitness in stochastic environments. Bet‐hedging is generally associated with parental effects, but phenotypic variation ... -
Maternal dopamine exposure provides offspring starvation resistance in Daphnia
Issa, Semona; Chaabani, Safa; Asimakopoulos, Alexandros; Jaspers, Veerle; Einum, Sigurd (Peer reviewed; Journal article, 2022)The neurotransmitter dopamine has been shown to play an important role in modulating behavioral, morphological, and life history responses to food abundance. However, costs of expressing high dopamine levels remain poorly ... -
Movement and growth of European grayling Thymallus thymallus in two Norwegian rivers
Nygård, Kenneth (Master thesis, 2012)Dersom forflytningsmønster er et trekk som er stabilt gjennom livet, er det flere årsaker til å anta at det kan påvirke vekst i de tidligere livsstadiene hos harr (Thymallus thymallus). Siden vekst før kjønnsmodning hos ... -
Negative relationships between population density and metabolic rates are not general
Yashchenko, Varvara; Fossen, Erlend Ignacio Fleck; Kielland, Øystein Nordeide; Einum, Sigurd (Journal article; Peer reviewed, 2016)Population density has recently been suggested to be an important factor influencing metabolic rates and to represent an important ‘third axis’ explaining variation beyond that explained by body mass and temperature. In ... -
No Evidence for Activity Adjustment in Response to Increased Density in Daphnia magna
Sereni, Laura; Einum, Sigurd (Journal article; Peer reviewed, 2015)Increased population density may lead to a decrease in energy available for growth and reproduction via effects on the activity level of individuals. Whilst this may be of particular importance for organisms that compete ... -
No evidence for thermal transgenerational plasticity in metabolism when minimizing the potential for confounding effects
Kielland, Øystein Nordeide; Bech, Claus; Einum, Sigurd (Journal article; Peer reviewed, 2017)Environmental change may cause phenotypic changes that are inherited across generations through transgenerational plasticity (TGP). If TGP is adaptive, offspring fitness increases with an increasing match between parent ...