Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2008
Sammendrag
Bestanden av granbarkbiller i Norge overvåkes av Norsk institutt for skog og landskap og skogbruksetaten i 12 fylker. Hvert år fanges det biller i mer enn 400 feller i nesten 100 kommuner. Takket være stor innsats fra de mange som har utført fangstarbeidet, har vi nå årlige data helt siden 1979.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Bjørn ØklandSammendrag
In recent years several forest insects have been recorded as newcomers or as more abundant than before towards northern latitudes and higher elevations in Norway. Such observations are from different groups of forest insect, including herbivorous geometrids, phloeophagous bark beetles and insects in cone seed .......
Sammendrag
The current report is a background for a Pest Risk Assessment (PRA) of the bark beetle species Ips amitinus in the PRA area of Norway, following the International Standards for Phytosanitary Measures ISPM 11 (FAO 2004). The report is based on updated information about distribution, pathogenicity and ecological information, which add to a previous PRA for this species. It is concluded that the risk of establishment is high with the current import and management practices. I. amitinus may potentially cause significant tree damage alone or in interaction with Ips typographus; however, the outcome is very much dependent on scenarios of climate development and population dynamics.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Extensive timber imports represent potential introduction pathways for exotic bark beetles (Col: Scolytidae) that may pose ecological hazards and economical risks to native forests. One such species, Ips amitinus Eichh., has been intercepted several times at Norwegian ports of entry in the years since 2002, the year of the first Scandinavian record. Detection of overwintering individuals of I. amitinus at the timber storage site of import timber and preliminary results of a stepwise import model may suggest a high risk of establishment and spread in Norway spruce forests in Scandinavia.Using various modeling approaches, our goal is to reduce the risk of introduction, establishment, and spread of introduced bark beetles. Our objectives are to:model the processes of dispersal and establishment of arriving bark beetlesexplore to what extent an introduced species interacting with native Ips typographus L., the most dominant species in Norway spruce, will lead to stronger and more frequent outbreaks of I. typographusassess potential patterns of spread of newly established bark beetle species and the spatiotemporal outbreak dynamics resulting from interactions between native and introduced species; andadvise on the implications for forest industry and management.Here we present current efforts to model dispersal (objective 1). Dispersal patterns, and hence rates of establishment and spread, may vary considerably depending on dispersal behaviors of insects, such as directionality of movement and aggregation propensity. To assess underlying assumptions of dispersal models, we are using an individual-based model where traits governing dispersal are inherited with random mutations. Individual reproductive success is determined by resource availability and density-dependence in a simulated landscape governed by external forces (e.g., windfellings) and beetle activity (consumption of resources). Evolvable traits include straight line vs. random-walk flight paths and aggregation propensity.Model simulations show that the chance of successful reproduction is greatest for intermediate to high levels of directionality, and that directionality increases over time up to a certain point determined by the landscape features as well as other traits of the species. Assuming limited (local) information in a stochastic landscape, intermediate to high degree of flight directionality is selected for.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Kirsten TørresenSammendrag
Oppspiring av av ugraset meldestokk før og etter simulert jordarbeiding for et felles europeisk/nord-amerikansk forsøk utført i 2005-2006 oppsummert.
Forfattere
Kirsten TørresenSammendrag
Effekt av jordarbeiding til ulik tid på våren på oppspiring av lokal (norsk) og felles (dansk) populasjon av meldestokk fra høsten 2007 til om med august 2008 i Ås, Norge ble presentert. Samme forsøk gjøres i 10-12 europeiske og nord-amerikanske land.