Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2013
Authors
Ingrid Holtsmark Sungsu Lee Kristin Aaser Lunde Kathrine Auestad Jodi Grødem Simon Geir MøllerAbstract
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Authors
Vidar Selås Sverre Kobro Geir Andreas SonerudAbstract
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Ragnhild NærstadAbstract
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Authors
Aruppillai Suthaparan Arne Stensvand Knut Asbjørn Solhaug Nils Bjugstad David Gadoury Hans Ragnar GislerødAbstract
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Authors
Hans Olav EggestadAbstract
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Authors
Tino Schott Lauri Teemu Kapari Snorre Hagen Ole Petter Laksforsmo Vindstad Jane Uhd Jepsen Rolf Anker ImsAbstract
Outbreaks of geometrid defoliators in subarctic birch forest in Fennoscandia often occur at high altitude in a distinct zone along the tree line. At the same time, moth larvae may not have an impact on the forest at lower altitude. Directly adjacent outbreak and nonoutbreak areas offer unique opportunities for studying the underlying mechanisms of outbreaks. Within two altitudinal gradients in coastal northern Norway, we investigated whether altitudinal outbreaks might be caused by release from pupal predation by ground-dwelling invertebrates such as harvestmen (Opiliones), spiders (Araneae), rove beetles (Coleoptera: Staphylinidae), carabid beetles (Coleoptera: Carabidae), and other beetles (Coleoptera). We predicted a consistently higher abundance of such generalist predators at low versus high altitudes. Our results did not support this prediction. There was no consistent altitudinal variation in the abundance of predators that could be related to zonal moth outbreaks in the birch forest slopes. In addition, none of the predator groups investigated showed any numerical response to a distinct outbreak of winter moth that took place during the course of the study. Consequently, localised moth outbreaks at the altitudinal tree line in northern Norway cannot be explained by the release from pupal predation by the predator groups examined here.
Abstract
No abstract has been registered