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.
2004
Abstract
No abstract has been registered
Authors
Svein Solberg Kjell Andreassen Nicholas Clarke Kjetil Tørseth Ole Einar Tveito Geir-Harald Strand Stein Michael TomterAbstract
No abstract has been registered
Authors
Stig Strandli GezeliusAbstract
A comparative qualitative study of Norwegian and Newfoundland inshore fisheries revealed that compliance with the state’s fisheries regulations was governed by a set of moral distinctions which were strikingly similar in the two cases. Violations of government regulations were followed by informal sanctions only in commercial fisheries. Illegal food fishery was generally accepted. A fisherman could also break the law in commercial fisheries without being met with significant sanctions provided that it was generally perceived to be the only way to ensure a necessary outcome. The empirical findings are connected to the moral meanings of money and food, and it is suggested that the economies of natural resource harvesters include two different moral spheres. One of these spheres is linked to subsistence, small-scale operations and local exchange, and is perceived as morally safe. The other sphere is connected with money, large-scale operations, and exchange with strangers, and is seen as morally perilous.
2003
Authors
Erlend Ystrøm Haartveit Dag FjeldAbstract
No abstract has been registered
Abstract
We fogged trees in two pine dominated forests in Norway with a synthetic pyrethroid in order to compare the canopy-dwelling fauna of arthropods between costal (Kvam) and boreal (Sigdal) sites and between old (250-330 years) and mature (60-120 years) trees at Sigdal. Almost 30,000 specimens were assigned to 510 species; only 93 species were present at both sites. Species diversity, as established by rarefaction, was similar in old and mature trees. However, the number of species new to Norway (including nine species new to science) was significantly higher in the old trees. We suggest that the scarcity of old trees, habitat heterogeneity and structural differences between old and mature trees may explain these patterns. Productivity and topographic position at the site of growth explained the between-tree variation in species occurrence for the more abundant species, which were mainly Collembola and Oribatida. Species diversity was similar at the boreal and coastal sites, but there were clear differences in species composition
Abstract
No abstract has been registered
Authors
Trond Knapp Haraldsen Per Anker PedersenAbstract
No abstract has been registered
Authors
Rolf Arnt Olsen Grete RasmussenAbstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
Tron Eid Bernt-Håvard ØyenAbstract
Models for predicting mortality in even-aged stands were developed. The models rely on data from the Norwegian National Forest Inventory, and were designed for use in large-scale forestry scenario models. A two-step modelling strategy was applied: i) logistic regression models predicting the probability of complete survival to occur, and ii) multiplicative regression models for stem number reduction and diameter calibration. A joint model for all species predicting the probability of survival to occur on a plot was developed. Separate models for spruce, pine and broadleaved-dominated forests were developed for stem number reduction, while no appropriate models for diameter calibration were found. The phenomenon mortality is a stochastic, rare and irregular event, and this was reflected as low R2 in the models. However, the model performance appeared logical and the results of validations based on independent data were reasonably good, i.e. the presented models may be applied for large-scale forestry scenario analyses. With new rotations of permanent sample plot measurements, the models should be evaluated and, if necessary, revised.