Blar i forfatter "Engen, Steinar"

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    • The Nature Index : a general framework for synthesizing knowledge on the State of Biodiversity 

      Certain, Gregoire; Skarpaas, Olav; Bjerke, Jarle Werner; Framstad, Erik; Lindholm, Markus; Nilsen, Jan-Erik; Norderhaug, Ann; Oug, Eivind; Pedersen, Hans-Christian; Schartau, Ann Kristin; van der Meeren, Gro Ingleid; Aslaksen, Iulie; Engen, Steinar; Garnåsjordet, Per-Arild; Kvaløy, Pål; Lillegård, Magnar; Yoccoz, Nigel; Nybø, Signe (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
      The magnitude and urgency of the biodiversity crisis is widely recognized within scientific and political organizations. However, a lack of integrated measures for biodiversity has greatly constrained the national and international response to the biodiversity crisis. Thus, integrated biodiversity indexes will greatly facilitate information transfer from science toward other areas of human society. ...

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

      Bellier, Edwige; Engen, Steinar; Jensen, Thomas Correll (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-26)
      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 the lognormal species abundance distribution to an assemblage of freshwater zooplankton sampled fve times a year (June–October) during the ice-free period over 28 years ...

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

      Bellier, Edwige; Sæther, Bernt-Erik; Engen, Steinar (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-12)
      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 model holds on the fact that predators and prey dynamics are simultaneously affected by correlated environmental noises. Interacting predators and prey are harvested using a proportional ...