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
Piotr Goliński Marek Czerwiński Marit Jørgensen Jørgen A.B. Mølmann Barbara Golińska Gregory TaffSammendrag
We investigated climatic trends in two contrasting locations in Europe at a regional level and at two specific sites, and we analysed how these trends are associated with the dry matter yield (DMY) of agriculturally improved grasslands. Trends of different meteorological variables were evaluated for Wielkopolska province, central Poland (1985-2014) and Troms county, northern Norway (1989-2015), as well as for two research stations located in these regions. Significant trends of increased mean air temperatures annually, and in April, June, July, August and November were identified both at the regional and site levels in Wielkopolska. In addition, growing degree days were increasing in Wielkopolska. In Troms, the common trends for the region and site studied were increase in mean air temperature in May and decrease in January. Grassland DMY was subsequently regressed against those meteorological variables for which significant trends were detected. In the Wielkopolska region, yields were negatively associated with the increase in air temperature in June, August, and the annual air temperature. The last relationship was also detected at the site level. We did not find any significant effects of climate trends on grassland DMY in the Norwegian study site or region.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Bruken av øl i fjellbygdene har mange fellestrekk med resten av landet. Mange av de eldre drikkeskikkene holdt seg likevel lengre der enn ellers. Bygg var det viktige ølkornet, men andre kornslag er brukt i tillegg for å gi et bedre øl. Sentrale ingredienser var einer, or og humle, mens bruken av urter synes mindre. Hovedtrekket etter Langfjellene er at mesk og vørter kokes på østsiden. I de vestnorske fjellbygdene er hovedtrekket at vørteren kokes, men ikke mesken. Råøl er registrert nord og sør av Langfjellene. I noen bygder, som Etnedal og Hemsedal, kan ølbryggingen være preget av en eldre tids bruk. Dersom en skal ha et «helnorskt» malt er Varde en seks-radsbygg som kan dyrkes i dal- og fjellbygder. Humle fra Numedal, Sykkylven, Vestre Gausdal og Vekkom i Ringebu har mest bitterhet. De mest aromatiske er fra Sør-Fron, Alvdal og Sykkylven. De humlene som scorer høyest på begge faktorene er fra Skjolden og Vestre Gausdal.
Forfattere
Melissa MagerøySammendrag
Det er ikke registrert sammendrag
Sammendrag
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Forfattere
Paal KrokeneSammendrag
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Forfattere
Dominique Gravel Benjamin Baiser Jennifer A. Dunne Jens-Peter Kopelke Neo D. Martinez Tommi Nyman Timothee Poisot Daniel B. Stouffer Jason M. Tylianakis Spencer A. Wood Tomas RoslinSammendrag
Biogeography has traditionally focused on the spatial distribution and abundance of species. Both are driven by the way species interact with one another, but only recently community ecologists realized the need to document their spatial and temporal variation. Here, we call for an integrated approach, adopting the view that community structure is best represented as a network of ecological interactions, and show how it translates to biogeography questions. We propose that the ecological niche should encompass the effect of the environment on species distribution (the Grinnellian dimension of the niche) and on the ecological interactions among them (the Eltonian dimension). Starting from this concept, we develop a quantitative theory to explain turnover of interactions in space and time – i.e. a novel approach to interaction distribution modeling. We apply this framework to host–parasite interactions across Europe and find that two aspects of the environment (temperature and precipitation) exert a strong imprint on species co-occurrence, but not on species interactions. Even where species co-occur, interaction proves to be stochastic rather than deterministic, adding to variation in realized network structure. We also find that a large majority of host-parasite pairs are never found together, thus precluding any inferences regarding their probability to interact. This first attempt to explain variation of network structure at large spatial scales opens new perspectives at the interface of species distribution modeling and community ecology.
Forfattere
Atle HaugeSammendrag
Det er ikke registrert sammendrag
Sammendrag
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Forfattere
Annbjørg KristoffersenSammendrag
Det er ikke registrert sammendrag