NO EN

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.

NIBIO's Scientific Publications →

Filter

2003

Lecture – Outline of a resource-based model for Ips typographus population dynamics

Bjørn Økland

, 2003.

Authors

Bjørn Økland

Abstract

No abstract has been registered

Lecture – Spatio-temporal patterns of Ips typographus population dynamics

Bjørn Økland

, 2003.

Authors

Bjørn Økland

Abstract

No abstract has been registered

Academic – Synchrony and geographical variation of the spruce bark beetle (Ips typographus) during a non-epidemic period

Bjørn Økland, Ottar N. Bjørnstad

Population Ecology, 45 2003. 213-219

Authors

Bjørn Økland Ottar N. Bjørnstad

Abstract

Spatio-temporal analyses of non-epidemic bark beetle populations may provide insight in dynamics predisposing for outbreaks. The present article presents a spatio-temporal analysis of the population dynamics of Ips typographus based on pheromone trap data from southeast and mid-Norway in the post-epidemic period 19792002. The analyses include regression analyses, hierarchical cluster analysis, and analysis of spatial synchrony of beetle time series and climatic data by means of nonparametric spatial covariance functions. The mean abundance of beetles declined linearly with latitude. In addition, the time series means were higher in areas with high forest productivity and rocky soils predisposed to drought. The time series patterns differed significantly between northern and southern study areas. The regional synchrony of the time series was fairly high (0.38), indicating that some large-scale climatic factor may influence the dynamics. Windfelling was the external variable showing the most parallel pattern of correlation to the beetle dynamics. We thus posit that large windfall events may be a major instigator and synchronizer of beetle outbreaks in areas subjected to regionalized weather systems.

Lecture – Osmotic blotter Method for detectiuon of Drechslera spp. in barley and oats seed

Guro Brodal

6th ISTA PDC seed health workshop, Christchurch. 10.02.2003 - 13.02.2003

Authors

Guro Brodal

Abstract

No abstract has been registered

Academic – The canopy arthropods of old and mature pine Pinus sylvestris in Norway

Karl Thunes, John Skartveit, Ivar Gjerde

Ecography, 36 2003. p. 490-502

Authors

Karl Thunes John Skartveit Ivar Gjerde

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

Lecture – Red belts. Occurrences in Norway in 2002

Halvor Solheim, Kåre Olav Venn

In: Thomsen, I.M. (ed.): Forest health problems in older forest stands. Proceedings of the Nordic/Baltic Forest Pathology Meeting, Denmark, September 2002. Skov & Landskab. Reports, 13 2003. 52-58

Authors

Halvor Solheim Kåre Olav Venn

Abstract

No abstract has been registered

Lecture – RESROBS: Resistance of spruce to root and butt rot disease, an EU-funded research program

Stephen Woodward, Jan Stenlid, Marco Michelozzi, ...

In: Laflamme, G., Berube, J.A. & Bussieres (eds.): Root and butt rots of forest trees. 10th Int. Conf. Root and Butt Rots. Proc. IUFRO WP 7.02.01, Quebec City, Canada, Sept. 16-22, 2001. Laurentian Forestry Centre. Information Report, LAU-X-126 2003. 375-377

Authors

Stephen Woodward Jan Stenlid Marco Michelozzi Halvor Solheim B. Karlsson Panaghiotis Tsopelas

Abstract

No abstract has been registered

Lecture – Rot and butt rot in Norway spruce stands following thinning done in summer and winter

Halvor Solheim

In: Thomsen, I.M. (ed.): Forest health problems in older forest stands. Proceedings of the Nordic/Baltic Forest Pathology Meeting, Denmark, September 2002. Skov & Landskab. Reports, 13 2003. 13-20

Authors

Halvor Solheim

Abstract

No abstract has been registered

Report – Stress-developed changes in monoterpene composition in stem phloem of Pinus sylvestris

M. Persson, J. Lönnquist, Bo Långström, ...

In: Persson, M.: Chemodiversity and function of monoterpene hydrocarbones in conifers. Doctoral thesis Royal inst. Technol. Dept. Chem., Org. Chem. Forskningsrapport 2003:83 (paper VIII, 10 pp.), 2003.

Authors

M. Persson J. Lönnquist Bo Långström Halvor Solheim M. Kyto Anna-Karin Borg-Karlson

Abstract

No abstract has been registered

Lecture – The needle blight fungusDelphinella abietis attacksAbies species in western Norway

Halvor Solheim

In: Thomsen, I.M. (ed.): Forest health problems in older forest stands. Proceedings of the Nordic/Baltic Forest Pathology Meeting, Denmark, September 2002. Skov & Landskab. Reports, 13 2003. 34-37

Authors

Halvor Solheim

Abstract

No abstract has been registered

Address	Postboks 115 NO-1431 Ås
Phone	+47 406 04 100
E-mail	post@nibio.no