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.
2025
Forfattere
Priyanka Trivedi Gang-Shuai Liu Linards Klavins Raktim Bhattacharya Soile Jokipii-Lukkari Adinpunya Mitra Maris Klavins Da-qi Fu Laura Jaakola Anna Szakiel Katja KarppinenSammendrag
Abstract The cuticle and cuticular waxes play vital roles as the interface between a plant and its environment. Cuticular waxes are composed of very long-chain fatty acids (VLCFAs) and their derivatives as well as triterpenoids, which are specialized metabolites. Although triterpenoids constitute a major fraction of cuticular waxes, their functions remain poorly understood. In this review, we provide an overview of the chemical diversity of triterpenoids in the cuticular waxes of leaves and fruits of angiosperms and discuss changes in triterpenoid content during their development. The methods and challenges for the analysis of cuticular wax triterpenoids are summarized. The biosynthesis of triterpenoids is also reviewed along with recent knowledge of the potential mechanisms of triterpenoid transportation and secretion from the site of biosynthesis to the plant surface. Considering ongoing climate change, the current understanding of the effects of environmental conditions and abiotic stress factors on cuticular wax triterpenoids is reviewed. We also present an overview of the current knowledge on the roles of triterpenoids in cuticular waxes in transpiration and defense against biotic stressors and their possible role in cuticle stabilization. Moreover, owing to the generally high levels of triterpenoids in fruit cuticular waxes, the provided information on the variation and role of cuticular wax triterpenoids during postharvest fruit storage might help in the development of strategies for better fruit quality maintenance and preservation.
Forfattere
Laura Jaakola Katja Karppinen N. Nguyen S. Jokipii-LukkariSammendrag
Det er ikke registrert sammendrag
Forfattere
Katja Karppinen Hilary Edema Muhammad Furqan Ashraf Laura JaakolaSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Adam Klimes Joseph Chipperfield Joachim Paul Töpper Marc Macias‐Fauria Marcus Spiegel Vigdis Vandvik Liv Guri Velle Alistair William Robin SeddonSammendrag
A number of modelling frameworks exist to estimate resilience from ecological datasets. A subset of these frameworks seeks to estimate the whole ‘stability landscape', which can be used to calculate resilience and identify stable states and tipping points. These methods provide opportunities for insights into possible causes and consequences of variation in ecosystem resilience and dynamics. However, because such models can be complex to implement, there has so far been a substantial barrier to their application in ecological research. Here, we present the ‘mixglm' package for R software, which parametrizes stability landscapes using a mixture model approach. It provides tools for the calculation of resilience, identification of stable states and tipping points, as well as visualization functions. Flexible model specification allows the mean, precision, and probability of each mixture component to be linked to multiple predictors, such as environmental covariates. ‘mixglm' is based on Bayesian inference via NIMBLE and supports normal, beta, gamma, and negative binomial distributed response variables. We illustrate the use of ‘mixglm' with a published case of tree cover in South America, which reports a stability landscape with distinct stable states. Using ‘mixglm', we replicated the identification of these states. Moreover, we quantified the uncertainty of our estimates, and computed resilience estimates of South America's forests. We also conducted a power analysis to provide guidance regarding required sample sizes. ‘mixglm' can be readily used to describe stability landscapes and identify stable states in most spatial datasets, and it is accompanied by tools for the calculation of resilience estimates.
Forfattere
Ellen Johanne SvalheimSammendrag
Foredrag på Beitekonferansen 2025
Forfattere
Catharina Caspara Vloon Rune Halvorsen Jørn-Frode Nordbakken Joachim Paul Töpper Inger Auestad Knut RydgrenSammendrag
Question How do vascular plant and cryptogam cover, bare peat area and species composition in different microforms on a boreal raised bog change over a 34‐year period (1988–2022)? We discuss the observed patterns in the light of ongoing climate change. Location Rønnåsmyra Nature Reserve, south‐eastern Norway. Methods We recorded total vascular plant and cryptogam cover, bare peat area and species composition in 51 permanent 0.5 × 0.5 m plots in 1988, 2004 and 2022. The plots were assigned to microform classes (carpet, lawn, hummock) based on their characteristics in 1988 and 2022. We analysed changes over time and explored the relationship between change in species composition and change in the relative distance from the bog surface to the groundwater table (rDWT) in each microform using linear mixed‐effect models and ordination (GNMDS). Results No shifts between microforms had occurred during the 34‐year period, but the number of observed taxa had decreased from 51 to 38. While the vegetation changed very little between 1988 and 2004, substantial changes occurred from 2004 to 2022. During this period, carpets showed a substantial increase in bare peat at the cost of cryptogam and vascular plant cover. Lawns showed a similar but less strong trend. Hummocks showed no such changes. The species composition of all microforms changed towards vegetation typical of wetter bog surfaces. In hummocks, this implied a shift from dominance by lichens to dominance by strongly peat‐producing Sphagnum species of section Acutifolia , coupled with an increase in rDWT. Conclusion We demonstrate that bog vegetation can change substantially within two decades. The observed, divergent successions—retrogressive in carpets and lawns and progressive in hummocks—may result from the responses of the cryptogam layer to a combination of increased temperature and increased precipitation. Extreme weather events may have contributed to the increase in bare peat.
Forfattere
Svein Eilertsen Jan Åge Riseth Mildrid Elvik Svoen Risten-Marja Inga Magne Haukås Simen Olafsen Håvard Alexander Hagen Marit Østby NilsenSammendrag
Rapporten er et forslag til metodikk for vurderinger av temaet reindrift i konsekvensutredninger.
Forfattere
Svein Eilertsen Elle Matsson-Valio Jan Åge Riseth Mildrid Elvik Svoen Simen Olafsen Risten-Marja Inga Håvard Alexander Hagen Marit Østby Nilsen Jo Jorem Aarseth Magne HaukåsSammendrag
Basert på gjennomgang av gjennomførte konsekvensutredninger innenfor temaet reindrift, er sentrale årsaker til at berørte reinbeitedistrikt mente at det var mangler/svakheter ved disse utredningene beskrevet. Basert på denne kartleggingen er det utarbeide et forslag til en metodikk for vurderinger av temaet reindrift i konsekvensutredninger.