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.
2018
Forfattere
Shane C. Frank Martin Leclerc Fanie Pelletier Frank Narve Rosell Jon Swenson Richard Bischof Jonas Kindberg Hans Geir Eiken Snorre Hagen Andreas ZedrosserSammendrag
1. There is a growing recognition of the importance of indirect effects from hunting on wildlife populations, e.g., social and behavioral changes due to harvest, which occur after the initial offtake. Nonetheless, little is known about how the removal of members of a population influences the spatial configuration of the survivors. 2. We studied how surviving brown bears (Ursus arctos) used former home ranges that had belonged to casualties of the annual bear hunting season in southcentral Sweden (2007-2015). We used resource selection functions to explore the effects of the casualty's and survivor's sex, age, and their pairwise genetic relatedness, population density, and hunting intensity on survivors' spatial responses to vacated home ranges. 3. We tested the competitive release hypothesis, whereby survivors that increase their use of a killed bear’s home range are presumed to have been released from intraspecific competition. We found strong support for this hypothesis, as survivors of the same sex as the casualty consistently increased their use of its vacant home range. Patterns were less pronounced or absent when the survivor and casualty were of opposite sex. 4. Genetic relatedness between the survivor and the casualty emerged as the most important factor explaining increased use of vacated male home ranges by males, with a stronger response from survivors of lower relatedness. Relatedness was also important for females, but it did not influence use following removal; female survivors used home ranges of higher related female casualties more, both before and after death. Spatial responses by survivors were further influenced by bear age, population density, and hunting intensity. 5. We have showed that survivors exhibit a spatial response to vacated home ranges caused by hunting casualties, even in non-territorial species such as the brown bear. This spatial reorganization can have unintended consequences for population dynamics and interfere with management goals. Altogether, our results underscore the need to better understand the shortand long-term indirect effects of hunting on animal social structure and their resulting distribution in space. Spatial response, kinship, competition, spatial reorganization, harvest, social structure
Forfattere
Nicholas Clarke Silje Skår O. Janne Kjønaas Kjersti Holt Hanssen Tonje Økland Jørn-Frode Nordbakken Toril Drabløs Eldhuset Holger LangeSammendrag
Short-term (three to four years) effects of forest harvesting on soil solution chemistry were investigated at two Norway spruce sites in southern Norway, differing in precipitation amount and topography. Experimental plots were either harvested conventionally (stem-only harvesting, SOH) or whole trees, including crowns, twigs and branches were removed (whole-tree harvesting, WTH), leaving residue piles on the ground for some months before removal. The WTH treatment had two sub-treatments: WTH-pile where there had been piles and WTH-removal, from where residues had been removed to make piles. Increased soil solution concentrations of NO3–N, total N, Ca, Mg and K at 30 cm depth, shown by peaks in concentrations in the years after harvesting, were found at the drier, less steep site in eastern Norway after SOH and WTH-pile, but less so after WTH-removal. At the wetter, steeper site in western Norway, peaks were often observed also at WTH-removal plots, which might reflect within-site differences in water pathways due largely to site topography.
2017
Forfattere
Bjørn Kløve Hanne Margrethe Lund Kvitsand Maria J. Gunnarsdottir Sylvi Gaut Tarja Pitkänen Sigurdur Gardarsson P. Rossi Ilkka MiettinenSammendrag
Det er ikke registrert sammendrag
Forfattere
Anders AasSammendrag
Det er ikke registrert sammendrag
Forfattere
Csilla Farkas Rain Elken Juan Manuel Garcia Diaz Anatoli Vassiljev Attila Nemes Johannes Deelstra Andreas Porman Tiia Pedusaar Per Stålnacke Peeter EnnetSammendrag
submittedVersion
Sammendrag
Miljømål i landbruksvassdrag oppgis gjerne som grenseverdier for gjennomsnittskonsentrasjoner av fosfor og nitrogen. For å finne miljømålet må vi vite noe om hva som er naturlige bakgrunnsverdier for disse næringsstoffene, altså hva ‘referansetilstanden’ er. På landbruksareal med marin leire er dette en stor utfordring. Dette skyldes dels at disse områdene gjerne har vært dyrket opp i århundrer; og dels at marin leire inneholder fosforrike mineraler. Vår målsetning har vært å anslå hvor mye fosfor som ville ha blitt tilført vannforekomstene fra et areal med marin leire hvis arealet ikke var oppdyrket, men befant seg i en naturtilstand (skog/utmark). Spørsmålet er relevant i forbindelse med gjennomføring av arbeidet med vannforskriften, og er viktig både for miljø‐ og landbruksforvaltningen. Prosjektets hovedfinansiører er Norges forskningsråd (Matprogrammet) og Stiftelsen fondet for jord‐ og myrundersøkelser.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Anne-Grete Buseth BlankenbergSammendrag
Det er ikke registrert sammendrag
Forfattere
Anne-Grete Buseth BlankenbergSammendrag
Det er ikke registrert sammendrag