Blar i Vitenskapelige artikler på forfatter "Økland, Bjørn"
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Complex responses of global insect pests to climate warming
Lehmann, Philipp; Ammunet, Tea; Barton, Madeleine; Battisti, Andrea; Eigenbrode, Sanford D.; Jepsen, Jane Uhd; Kalinkat, Gregor; Neuvonen, Seppo; Niemela, Pekka; Terblanche, John s.; Økland, Bjørn; Björkman, Christer (Peer reviewed; Journal article, 2020-02-03)Although it is well known that insects are sensitive to temperature, how they will be affected by ongoing global warming remains uncertain because these responses are multifaceted and ecologically complex. We reviewed the ... -
Range expansion of the small spruce bark beetle Ips amitinus: a newcomer in northern Europe
Økland, Bjørn; Flø, Daniel; Schroeder, Martin; Zach, Peter; Cocos, Dragos; Martikainen, Petri; Siitonen, Juha; Mandelshtam, Michail Y.; Musolin, Dmitry L.; Neuvonen, Seppo; Vakula, Jozef; Nikolov, Christo; Lindelöw, Åke; Voolma, Kaljo (Journal article; Peer reviewed, 2019)1 Ips amitinus arrived in Northern Europe at the beginning of 1900s, although its recent expansions to the northernmost conifers have been rapid. 2 Analyses of recent records, MaxEnt models and regional population size ... -
Successful reproduction and pheromone production by the spruce bark beetle in evolutionary naïve spruce hosts with familiar terpenoid defences
Flø, Daniel; Norli, Hans Ragnar; Økland, Bjørn; Krokene, Paal (Journal article; Peer reviewed, 2018-02)1. The European spruce bark beetle Ips typographus is a damaging pest on spruce in Europe. Beetle interactions with tree species originating outside the natural range of the beetle are largely unknown and may be unpredictable ... -
Trees Wanted—Dead or Alive! Host Selection and Population Dynamics in Tree-Killing Bark Beetles
Kausrud, Kyrre Linné; Grégoire, Jean-Claude; Skarpaas, Olav; Erbilgin, Nadir; Gilbert, Marius; Økland, Bjørn; Stenseth, Nils Christian (Journal article; Peer reviewed, 2011-05-25)Bark beetles (Coleoptera: Curculionidae, Scolytinae) feed and breed in dead or severely weakened host trees. When their population densities are high, some species aggregate on healthy host trees so that their defences may ...