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.
2000
Authors
Bjørn ØklandAbstract
Insect species in 20 families of Diptera were collected by an equal number of interception traps in spruce forests of different management practice:young regrowth 5-10 years after logging and replantingmanaged old-growth forestgap opening of old-growth forest with plenty of even-aged dead wooda shady remnant biotope of uncultivated old-growth forest with plenty of dead wood in various levels of decay. Forest cultivation seems to favour saprophagous generalists on behalf of the specialised fungal fauna. The species in mycorrhizal fungi were clearly reduced in young regrowth, while species in wood-inhabiting fungi were most diverse in the remnant biotope with a heterogeneous composition of dead wood.The abundance of saprophagous generalists was significantly increased in the managed forest variants (young regrowth and managed old-growth forest). More studies are necessary to evaluate how the shift in decomposer fauna influence nutrient cycling and other ecosystem processes in forests.
Abstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
Bjørn ØklandAbstract
No abstract has been registered
Authors
Bjørn ØklandAbstract
No abstract has been registered
Authors
Bjørn ØklandAbstract
No abstract has been registered
1999
Authors
Torstein KvammeAbstract
No abstract has been registered
Authors
Bjørn ØklandAbstract
Information about larval ecology is fundamental in entomological research; however, in many insect species the larval habitat is still unknown. In the present project, Diptera insects were reared from various microhabitats and substrates of coniferous and deciduous forests of southern Norway. The material included 54 species that have not been reared earlier and 213 new species-microhabitat relationships. Many new records were found in dead wood of common tree species, such as Picea abies, Populus tremula and Fraxinus excelsior. Microhabitats associated with the root zone of windfelled trees showed the highest number of new species-microhabitat relationships.
1998
Abstract
The genus Bryomyia comprises altogether eight species in the Palearctic region, including one new species Bryomyia amurensis Mamaev et Økland described in the present article. A revised key to the species of Bryomyia in the Holarctic region is presented.
Authors
Bjørn ØklandAbstract
A short survey shows a lack of continuity in research on the dipteran family Milichiidae in Norway. One common species has several records from the last century, while little else is found before recent time and the new material presented in this article. The number of Norwegian species in Milichiidae is hereby raised to five, and in addition one possible new species. Comparisons with species numbers in neighbouring countries give an indication that still new species for Norway may be found. Rearing habitats for Neophyllomyza acyglossa (Villeneuve, 1920) and the possible new species Leptometopa sp. are presented for the first time.