Blar i NTNU Open på forfatter "Engen, Steinar"

Viser treff 21-30 av 30

    • Population responses to harvesting in fluctuating environments 

      Lee, Aline Magdalena; jarillo, j; Peeters, Bart; Hansen, Brage Bremset; cao-garcia, francisco; Sæther, Bernt-Erik; Engen, Steinar (Peer reviewed; Journal article, 2021)
      Achieving sustainable harvesting of natural populations depends on our ability to predict population responses to the combined effects of harvesting and environmental fluctuations while accounting for other internal and ...

    • Reversal of response to artificial selection on body size in a wild passerine bird 

      Kvalnes, Thomas; Ringsby, Thor Harald; Jensen, Henrik; Hagen, Ingerid Julie; Rønning, Bernt; Pärn, Henrik; Holand, Håkon; Engen, Steinar; Sæther, Bernt-Erik (Journal article, 2017)
      A general assumption in quantitative genetics is the existence of an intermediate phenotype with higher mean individual fitness in the average environment than more extreme phenotypes. Here we investigate the evolvability ...

    • Seasonal diversity dynamics of a boreal zooplankton community under climate impact 

      Bellier, Edwige; Engen, Steinar; Jensen, Thomas Correll (Journal article; Peer reviewed, 2022)
      Seasonality and long-term environmental variability afect species diversity through their efects on the dynamics of species. To investigate such efects, we ftted a dynamic and heterogeneous species abundance model generating ...

    • Spatial covariation of competing species in a fluctuating environment 

      Lee, Aline Magdalena; Sæther, Bernt-Erik; Engen, Steinar (Journal article; Peer reviewed, 2020)
      Understanding how stochastic fluctuations in the environment influence population dynamics is crucial for sustainable management of biological diversity. However, because species do not live in isolation, this requires ...

    • Spatial scales of population synchrony in predator-prey systems 

      Jarillo, Javier Diaz; Sæther, Bernt-Erik; Engen, Steinar; Cao-Garcia, Francisco (Peer reviewed; Journal article, 2020)
      Many species show synchronous fluctuations in population size over large geographical areas, which are likely to increase their regional extinction risk. Here we examine how the degree of spatial synchrony in population ...

    • Spatial scaling of population synchrony in marine fish depends on their life history 

      Fredricson Marquez, Jonatan; Lee, Aline Magdalena; Aanes, Sondre; Engen, Steinar; Herfindal, Ivar; Salthaug, Are; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2019)
      The synchrony of population dynamics in space has important implications for ecological processes, for example affecting the spread of diseases, spatial distributions and risk of extinction. Here, we studied the relationship ...

    • Structure of the G-matrix in relation to phenotypic contributions to fitness 

      Engen, Steinar; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2021)
      Classical theory in population genetics includes derivation of the stationary distribution of allele frequencies under balance between selection, genetic drift, and mutation. Here we investigate the simplest generalization ...

    • Sustainable strategies for harvesting predators and prey in a fluctuating environment 

      Bellier, Edwige; Sæther, Bernt-Erik; Engen, Steinar (Peer reviewed; Journal article, 2021)
      The effects of harvest and fluctuating environment on inter-dependent predators and prey are complex and not well-known. We define a stochastic model where the predators and prey dynamically interact. The novelty of the ...

    • Temporal changes in parameters describing stochastic population dynamics 

      Solbu, Erik Blystad (Master thesis, 2011)
      The solution of a stochastic differential equation with temporally dependent parameters is the basis for the following analysis of stochastic population dynamics with temporal changes in the parameters. A discrete density ...

    • Towards a predictive conservation biology: the devil is in the behaviour 

      Sæther, Bernt-Erik; Engen, Steinar (Peer reviewed; Journal article, 2019)
      One of the most important challenges in conservation biology is to predict the viability of populations of vulnerable and threatened species. This requires that the demographic stochasticity strongly affecting the ecological ...