Bakgrunn
2014 - PhD, UiO
2009 - M.Sc,UiO
2007 - B.Sc, UiO
Emneord:
Ektomykorrhiza,
Mykologi,
Botanikk,
Bakteriar,
High-throughput sequencing
Publikasjoner
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Vik, Unni; Hov, Asbjørn Magnar & Langholm, Guri
(2025).
Stor variasjon i naturfagmateriell i Oslobarnehagar.
Nordic Studies in Science Education (NorDiNa).
ISSN 1504-4556.
21(2),
s. 176–189.
doi:
10.5617/nordina.11402.
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Det fysiske miljøet i barnehagane, inkludert materiell som barna har tilgang på, er ein strukturell kvalitetsindikator for barnehagar og er med på å forme kva leik og læring som barna vert engasjert i. Kva naturfagmateriell som finst, og i kva grad det er tilgjengeleg for barna i barnehagar påverkar leik- og læringspotensialet innan fagområdet Natur, miljø og teknologi, som er eit fagområde i den norske rammeplanen for barnehagar.
Som ein del av Språksterk 1-6 prosjektet svarte 81 pedagogiske leiarar i barnehagar i levekårsutsette bydelar i Oslo på kva naturfagmateriell som fantes i små- og storbarnsavdelingar i barnehagane og kva av materiellet som var tilgjengeleg for barna. Jamvel om plastleiker og byggjemateriell som nyttast i konstruksjonsleik fanst og var tilgjengeleg for barna i dei fleste barnehagane, varierte både tilfang av- og tilgang på naturfagmateriell stort mellom barnehagane. Det var få signifikante skilnadar mellom stor- og småbarnsavdelingar i tilfang på naturfagmateriell, men det var meir utilgjengeleg materiell på småbarnsavdelingane.
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Ronold, Eivind Kverme; Vik, Unni; Vandvik, Vigdis; Kauserud, Håvard & Thoen, Ella
(2025).
Elevational range expansion of Betula pubescens may be slowed by lack of suitable mycorrhizal symbionts in alpine soils.
Fungal ecology.
ISSN 1754-5048.
77.
doi:
10.1016/j.funeco.2025.101454.
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The elevational limit for trees is increasing worldwide due to global warming. The elevational range expansion of obligate ectomycorrhizal trees, such as Betula pubescens, may however be limited by lack of fungal symbionts above the treeline since the vegetation here is often dominated by plants forming other mycorrhizal types. We set up a cross-factorial experiment cultivating Betula pubescens seedlings in alpine and lowland soils, at simulated alpine and lowland temperatures, to test whether the fungal community may limit seedling establishment. We found that alpine soils contained fewer ectomycorrhizal fungi in general and that seedlings cultivated in alpine soil were smaller and recruited fewer ectomycorrhizal fungi compared to seedlings cultivated in lowland soil. Our results indicate a link between seedling success, soil fungal community and mycorrhizal colonization. We suggest that unsuccessful mycorrhization of seedlings above the treeline may be limiting for treeline expansion under increased alpine temperatures.
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Vik, Unni; Botnen, Synnøve Smebye & Sandbakken, Mari
(2021).
Artar som kan skape tilhøyrsle til natur på barnehagen sitt uteområde.
I Jørgensen-Vittersø, Kari Anne & Vik, Unni (Red.),
Barn i by.
Universitetsforlaget.
ISSN 9788215040936.
s. 85–98.
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Sandbakken, Mari; Vik, Unni & Botnen, Synnøve Smebye
(2021).
Dyr i byen. Barns muligheter til å oppleve dyr og dyreliv i byen.
I Jørgensen-Vittersø, Kari Anne & Vik, Unni (Red.),
Barn i by.
Universitetsforlaget.
ISSN 9788215040936.
s. 71–83.
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Thoen, Ella; Harder, Christoffer Bugge; Kauserud, Håvard; Botnen, Synnøve Smebye; Vik, Unni & Taylor, Andy F.S.
[Vis alle 8 forfattere av denne artikkelen]
(2020).
In vitro evidence of root colonization suggests ecological versatility in the genus Mycena.
New Phytologist.
ISSN 0028-646X.
227,
s. 601–612.
doi:
10.1111/nph.16545.
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- The root‐associated habit has evolved on numerous occasions in different fungal lineages, suggesting a strong evolutionary pressure for saprotrophic fungi to switch to symbiotic associations with plants. Species within the ubiquitous, saprotrophic genus Mycena are frequently major components in molecular studies of root‐associated fungal communities, suggesting that an evaluation of their trophic status is warranted. Here, we report on interactions between a range of Mycena species and the plant Betula pendula. - In all, 17 Mycena species were inoculated onto B. pendula seedlings. Physical interactions between hyphae and fine roots were examined using differential staining and fluorescence microscopy. Physiological interactions were investigated using 14C and 32P to show potential transfer between symbionts. - All Mycena species associated closely with fine roots, showing hyphal penetration into the roots, which in some cases were intracellular. Seven species formed mantle‐like structures around root tips, but none formed a Hartig net. Mycena pura and Mycena galopus both enhanced seedling growth, with M. pura showing significant transfer of 32P to the seedlings. - Our results support the view that several Mycena species can associate closely with plant roots and some may potentially occupy a transitional state between saprotrophy and biotrophy.
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Rechsteiner, Aud Helen Halbritter; Boeck, Hans J. De; Eycott, Amy Elizabeth; Reinsch, Sabine; Robinson, David A. & Vicca, Sara
[Vis alle 115 forfattere av denne artikkelen]
(2019).
The handbook for standardized field and laboratory
measurements in terrestrial climate change experiments and
observational studies (ClimEx).
Methods in Ecology and Evolution.
11(1),
s. 22–37.
doi:
10.1111/2041-210X.13331.
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1. Climate change is a world-wide threat to biodiversity and ecosystem structure,
functioning and services. To understand the underlying drivers and mechanisms,
and to predict the consequences for nature and people, we urgently need better
understanding of the direction and magnitude of climate change impacts across
the soil–plant–atmosphere continuum. An increasing number of climate change
studies are creating new opportunities for meaningful and high-quality generalizations
and improved process understanding. However, significant challenges
exist related to data availability and/or compatibility across studies, compromising
opportunities for data re-use, synthesis and upscaling. Many of these challenges
relate to a lack of an established ‘best practice’ for measuring key impacts and
responses. This restrains our current understanding of complex processes and
mechanisms in terrestrial ecosystems related to climate change.
2. To overcome these challenges, we collected best-practice methods emerging
from major ecological research networks and experiments, as synthesized by 115 experts from across a wide range of scientific disciplines. Our handbook contains
guidance on the selection of response variables for different purposes, protocols for
standardized measurements of 66 such response variables and advice on data management.
Specifically, we recommend a minimum subset of variables that should be
collected in all climate change studies to allow data re-use and synthesis, and give
guidance on additional variables critical for different types of synthesis and upscaling.
The goal of this community effort is to facilitate awareness of the importance
and broader application of standardized methods to promote data re-use, availability,
compatibility and transparency. We envision improved research practices
that will increase returns on investments in individual research projects, facilitate
second-order research outputs and create opportunities for collaboration across
scientific communities. Ultimately, this should significantly improve the quality and
impact of the science, which is required to fulfil society's
best practice, coordinated experiments, data management and documentation, ecosystem,
experimental macroecology, methodology, open science, vegetation
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Aas, Anders Bjørnsgard; Andrew, Carrie Joy; Blaalid, Rakel; Vik, Unni; Kauserud, Håvard & Davey, Marie Louise
(2019).
Fine-scale diversity patterns in belowground microbial communities are consistent across kingdoms.
FEMS Microbiology Ecology.
ISSN 0168-6496.
95(6),
s. 1–11.
doi:
10.1093/femsec/fiz058.
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The belowground environment is heterogeneous and complex at fine spatial scales. Physical structures, biotic components
and abiotic conditions create a patchwork mosaic of potential niches for microbes. Questions remain about mechanisms
and patterns of community assembly belowground, including: Do fungal and bacterial communities assemble differently?
How do microbes reach the roots of host plants? Within a 4 m2 plot in alpine vegetation, high throughput sequencing of the
16S (bacteria) and ITS1 (fungal) ribosomal RNA genes was used to characterise microbial community composition in roots
and adjacent soil of a viviparous host plant (Bistorta vivipara). At fine spatial scales, beta-diversity patterns in belowground
bacterial and fungal communities were consistent, although compositional change was greater in bacteria than fungi.
Spatial structure and distance-decay relationships were also similar for bacteria and fungi, with significant spatial structure
detected at <50 cm among root- but not soil-associated microbes. Recruitment of root microbes from the soil community
appeared limited at this sampling and sequencing depth. Possible explanations for this include recruitment from
low-abundance populations of soil microbes, active recruitment from neighbouring plants and/or vertical transmission of
symbionts to new clones, suggesting varied methods of microbial community assembly for viviparous plants. Our results
suggest that even at relatively small spatial scales, deterministic processes play a significant role in belowground microbial
community structure and assembly.
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Botnen, Synnøve Smebye; Davey, Marie Louise; Aas, Anders Bjørnsgard; Carlsen, Tor; Thoen, Ella & Heegaard, Einar
[Vis alle 12 forfattere av denne artikkelen]
(2019).
Biogeography of plant root-associated fungal communities in the North Atlantic region mirrors climatic variability.
Journal of Biogeography.
ISSN 0305-0270.
46(7),
s. 1532–1546.
doi:
10.1111/jbi.13613.
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Aim
Polar and alpine ecosystems appear to be particularly sensitive to increasing temperatures and the altered precipitation patterns linked to climate change. However, little is currently known about how these environmental drivers may affect edaphic organisms within these ecosystems. In this study, we examined communities of plant root‐associated fungi (RAF) over large biogeographical scales and along climatic gradients in the North Atlantic region in order to gain insights into the potential effects of climate variability on these communities. We also investigated whether selected fungal traits were associated with particular climates.
Locations
Austria, Scotland, Mainland Norway, Iceland, Jan Mayen and Svalbard.
Taxa
Root fungi associated with the ectomycorrhizal and herbaceous plant Bistorta vivipara.
Methods
DNA metabarcoding of the ITS1 region was used to characterize the RAF of 302 whole plant root systems, which were analysed by means of ordination methods and linear modelling. Fungal spore length, width, volume and shape, as well as mycelial exploration type (ET) of ectomycorrhizal (ECM) basidiomycetes were summarized at a community level.
Results
The RAF communities exhibited strong biogeographical structuring, and both compositional variation as well as fungal species richness correlated with annual temperature and precipitation. In accordance with general island biogeography theory, the least species‐rich RAF communities were found on Jan Mayen, a remote and small island in the North Atlantic Ocean. Fungal spores tended to be more elongated with increasing latitude. We also observed a climate effect on which mycelial ET was dominating among the ectomycorrhizal fungi.
Main conclusions
Both geographical and environmental variables were important for shaping root‐associated fungal communities at a North Atlantic scale, including the High Arctic. Fungal OTU richness followed general biogeographical patterns and decreased with decreasing size and/or increasing isolation of the host plant population. The probability of possessing more elongated spores increases with latitude, which may be explained by a selection for greater dispersal capacity among more isolated host plant populations in the Arctic.
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Thoen, Ella; Aas, Anders Bjørnsgard; Vik, Unni; Brysting, Anne Krag; Skrede, Inger & Carlsen, Tor
[Vis alle 7 forfattere av denne artikkelen]
(2019).
A single ectomycorrhizal plant root system includes a diverse and spatially structured fungal community.
Mycorrhiza.
ISSN 0940-6360.
29(3),
s. 167–180.
doi:
10.1007/s00572-019-00889-z.
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Although only a relatively small proportion of plant species form ectomycorrhizae with fungi, it is crucial for growth and survival for a number of widespread woody plant species. Few studies have attempted to investigate the fine scale spatial structure of entire root systems of adult ectomycorrhizal (EcM) plants. Here, we use the herbaceous perennial Bistorta vivipara to map the entire root system of an adult EcM plant and investigate the spatial structure of its root-associated fungi. All EcM root tips were sampled, mapped and identified using a direct PCR approach and Sanger sequencing of the internal transcribed spacer region. A total of 32.1% of all sampled root tips (739 of 2302) were successfully sequenced and clustered into 41 operational taxonomic units (OTUs). We observed a clear spatial structuring of the root-associated fungi within the root system. Clusters of individual OTUs were observed in the younger parts of the root system, consistent with observations of priority effects in previous studies, but were absent from the older parts of the root system. This may suggest a succession and fragmentation of the root-associated fungi even at a very fine scale, where competition likely comes into play at different successional stages within the root system.
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Hicks, Natalie; Vik, Unni; Taylor, Peter; Ladoukakis, Efthymios; Park, Joonsang & Kolisis, Frangiskos
[Vis alle 7 forfattere av denne artikkelen]
(2016).
Using Prokaryotes for Carbon Capture Storage.
Trends in Biotechnology.
ISSN 0167-7799.
35(1),
s. 22–32.
doi:
10.1016/j.tibtech.2016.06.011.
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Geological storage of CO2 is a fast-developing technology that can mitigate rising carbon emissions. However, there are environmental concerns with the long-term storage and implications of a leak from a carbon capture storage (CCS) site. Traditional monitoring lacks clear protocols and relies heavily on physical methods. Here, we discuss the potential of biotechnology, focusing on microbes with a natural ability to utilize and assimilate CO2 through different metabolic pathways. We propose the use of natural microbial communities for CCS monitoring and CO2 utilization, and, with examples, demonstrate how synthetic biology may maximize CO2 uptake within and above storage sites. An integrated physical and biological approach, combined with metagenomics data and biotechnological advances, will enhance CO2 sequestration and prevent large-scale leakages.
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Mundra, Sunil; Halvorsen, Rune; Kauserud, Håvard; Müller, Eike; Vik, Unni & Eidesen, Pernille Bronken
(2015).
Arctic fungal communities associated with roots of Bistorta vivipara do not respond to the same fine-scale edaphic gradients as the aboveground vegetation.
New Phytologist.
ISSN 0028-646X.
205(4),
s. 1587–1597.
doi:
10.1111/nph.13216.
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Davey, Marie Louise; Blaalid, Rakel; Vik, Unni; Carlsen, Tor; Kauserud, Håvard & Eidesen, Pernille Bronken
(2015).
Primary succession of Bistorta vivipara (L.) Delabre (Polygonaceae) root-associated fungi mirrors plant succession in two glacial chronosequences.
Environmental Microbiology.
ISSN 1462-2912.
17(8),
s. 2777–2790.
doi:
10.1111/1462-2920.12770.
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Botnen, Synnøve; Vik, Unni; Carlsen, Tor; Eidesen, Pernille Bronken; Davey, Marie Louise & Kauserud, Håvard
(2014).
Low host specificity of root-associated fungi at an Arctic site.
Molecular Ecology.
ISSN 0962-1083.
23(4),
s. 975–985.
doi:
10.1111/mec.12646.
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Fang, Yao; Vik, Unni; Brysting, Anne Krag; Carlsen, Tor; Halvorsen, Rune & Kauserud, Håvard
(2013).
Substantial compositional turnover of fungal communities in an alpine ridge-to-snowbed gradient.
Molecular Ecology.
ISSN 0962-1083.
22(19),
s. 5040–5052.
doi:
10.1111/mec.12437.
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Vik, Unni; Logares, Ramiro; Blaalid, Rakel; Halvorsen, Rune; Carlsen, Tor & Bakke, Ingrid
[Vis alle 9 forfattere av denne artikkelen]
(2013).
Different bacterial communities in ectomycorrhizae and surrounding soil.
Scientific Reports.
3(347).
doi:
10.1038/srep03471.
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Several eukaryotic symbioses have shown to host a rich diversity of prokaryotes that interact with their hosts. Here, we study bacterial communities associated with ectomycorrhizal root systems of Bistorta vivipara compared to bacterial communities in bulk soil using pyrosequencing of 16S rRNA amplicons. A high richness of Operational Taxonomic Units (OTUs) was found in plant roots (3,571 OTUs) and surrounding soil (3,476 OTUs). The community composition differed markedly between these two environments. Actinobacteria, Armatimonadetes, Chloroflexi and OTUs unclassified at phylum level were significantly more abundant in plant roots than in soil. A large proportion of the OTUs, especially those in plant roots, presented low similarity to Sanger 16S rRNA reference sequences, suggesting novel bacterial diversity in ectomycorrhizae. Furthermore, the bacterial communities of the plant roots were spatially structured up to a distance of 60 cm, which may be explained by bacteria using fungal hyphae as a transport vector. The analyzed ectomycorrhizae presents a distinct microbiome, which likely influence the functioning of the plant-fungus symbiosis.
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Vik, Unni; Carlsen, Tor; Eidesen, Pernille Bronken; Brysting, Anne Krag & Kauserud, Håvard
(2012).
Microsatellite markers for Bistorta vivipara (Polygonaceae).
American Journal of Botany.
ISSN 0002-9122.
99(6),
s. E226–E229.
doi:
10.3732/ajb.1100504.
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Vik, Unni; Jørgensen, Marte Holten; Kauserud, Håvard; Nordal, Inger & Brysting, Anne Krag
(2010).
Microsatellite markers show decreasing diversity but unchanged level of clonality in Dryas octopetala (Rosaceas) with increasing latitude.
American Journal of Botany.
ISSN 0002-9122.
97(6),
s. 988–997.
doi:
10.3732/ajb.0900215.
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Se alle arbeider i NVA
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Hagen, Liv Anna; Bergflødt, Sigurd; Anvik, Elisabeth & Vik, Unni
(2025).
Naturfag i bybarnehager.
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Langholm, Guri; Vik, Unni & Hov, Asbjørn Magnar
(2025).
Her kommer vintern!
Verktøykassa : inspirasjon og ideer til barnehagen.
ISSN 1504-8810.
27(4),
s. 58–64.
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Langholm, Guri; Vik, Unni & Hov, Asbjørn Magnar
(2025).
Æsj så ekkelt!
Verktøykassa : inspirasjon og ideer til barnehagen.
ISSN 1504-8810.
27(3),
s. 60–65.
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Vik, Unni; Hov, Asbjørn Magnar & Langholm, Guri
(2025).
Increased teacher comfort towards science teaching following a professional development course (PD) and intervention in Norwegian ECEC centers.
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International studies on Early Childhood Education and Care (ECEC) teachers attitudes toward science have consistently found that positive attitudes towards science relates to both self-efficacy and self-confidence toward science teaching (Oon, Hu and Wei; 2019; Lloyd, 2016; Ultay, et al. 2020). Teachers’ beliefs in what children benefit from when it comes to participating in science activities, and if ECEC teachers perceive challenges regarding performing science activities in ECECs have been less studied. As part of the as part of the [project name], we measured teachers attitudes and beliefs towards science pre- and post a professional development (PD) course and intervention in Norwegian ECEC centers. The participating preschools implemented a PD program, and received pedagogical content, including children's books, suggestions of science activities and of play. As part of the PD the entire staff participated in a total of 11 two-hour long courses, where science and didactical reflections were processed. The Preschool Teacher Attitudes and Beliefs Towards Science (P-TABS) questionnaire (Maier et al 2013) was used pre- and post intervention. The ECEC teachers participating in the professional development (PD) program and intervention significantly increased their comfort towards teaching science, but their perceived challenges and belief in sciences contribution to child benefit remained consistent.
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Hov, Asbjørn Magnar; Langholm, Guri & Vik, Unni
(2025).
Nysgjerrig Friluftsliv.
Verktøykassa/ Pedagogisk Forum.
s. 47–52.
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Vik, Unni; Hov, Asbjørn Magnar & Langholm, Guri
(2025).
Kva kan erfarast i den ville leiken?
Verktøykassa/ Pedagogisk Forum.
s. 37–41.
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Langholm, Guri; Vik, Unni & Hov, Asbjørn Magnar
(2024).
Implementering av de naturfaglige aktivitetene og de pedagogiske ledernes holdninger til å arbeide med naturfaget i barnehagene. Forskningsresultater.
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Langholm, Guri; Hov, Asbjørn Magnar & Vik, Unni
(2024).
Holdninger og overbevisninger til naturfag hos pedagogiske ledere. Resultater fra intervensjonsstudien Språksterk 1-6.
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Vik, Unni
(2024).
Jøss‽ #142 - Godtepose full av grisehud og jentelus, pølser i svelget, og promp som endret livet på jorda.
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Langholm, Guri; Hov, Asbjørn Magnar & Vik, Unni
(2024).
Fysikk, kjemi og teknologi i barnehagen.
Verktøykassa/ Pedagogisk Forum.
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Hov, Asbjørn Magnar; Vik, Unni & Langholm, Guri
(2024).
Aktive voksne i alle årstider.
Verktøykassa/ Pedagogisk Forum.
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Hov, Asbjørn Magnar; Vik, Unni & Langholm, Guri
(2024).
Naturfagsmateriell- nøkkelen til utforskning og oppdagelse.
Verktøykassa/ Pedagogisk Forum.
s. 58–64.
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Ronold, Eivind Kverme; Vik, Unni; Kauserud, Håvard & Thoen, Ella
(2024).
Elevational range expansion of Betula pubescens may be slowed by lack of suitable mycorrhizal symbionts in alpine soils.
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Langholm, Guri; Hov, Asbjørn Magnar & Vik, Unni
(2023).
Naturfagsmateriell i Oslobarnehager.
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Langholm, Guri; Hov, Asbjørn Magnar & Vik, Unni
(2023).
Holdninger og overbevisninger rundt naturfag hos pedagogiske ledere. Foreløpige resultater fra intervensjonsstudien Språksterk 1-6.
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Ronold, Eivind Kverme; Kauserud, Håvard; Thoen, Ella & Vik, Unni
(2022).
Unsuccessful mycorrhization of seedlings slow the advance of the tree- and forest line in alpine ecosystems.
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Vik, Unni; Botnen, Synnøve Smebye & Sandbakken, Mari
(2021).
Planter som kan skape tilhøyrsle til natur på barnehagen sitt uteområde.
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Vik, Unni
(2020).
Løvetann – meir enn eit ufordrageleg ugras?
Tidsskriftet Forskerfrø.
ISSN 2703-8092.
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Vik, Unni; Pérez-Izquierdo, Leticia; Thoen, Ella & Clemmensen, Karina E.
(2018).
Fungal communities in a changing climate.
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Vik, Unni
(2018).
The DRIVE project - The plant root microbiome diversity and resilience in a changing climate.
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Vik, Unni
(2017).
Ørsmå sopptrådar kan halde klimaet i sjakk.
Aftenposten (morgenutg. : trykt utg.).
ISSN 0804-3116.
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Vik, Unni; Jørgensen, Marte Holten; Kauserud, Håvard & Brysting, Anne Krag
(2008).
Phylogeography and population structure of Dryas octopetela analysed by microsatellite markers.
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Hansen, Simen Hyll; Kauserud, Håvard; Davey, Marie Louise; Thoen, Ella; Vik, Unni & Brysting, Anne Krag
(2018).
Climate and host identity structure fungal endophyte communities.
Universitetet i Oslo.
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Publisert
1. juni 2011 10:37
- Sist endret
15. des. 2025 10:17