Jenni Nordén

Norwegian Institute for Nature Research | NINA · Oslo

Novel methods for sampling and characterizing biodiversity hold great promise for re-evaluating patterns of life across the planet. The sampling of airborne spores with a cyclone sampler, and the sequencing of their DNA, have been suggested as an efficient and well-calibrated tool for surveying fungal diversity across various environments. Here we...

Den 29. april 2022 overleverte VKM rapporten Impacts of climate change on the boreal forest ecosystem1 (VKM Report 2022:15) til Miljødirektoratet som svar på oppdraget som er beskrevet under. I prosessen ble det bestemt at rapporten også skulle utgis i en forkortet versjon på norsk. Dette er denne utgaven. I tillegg til å forkorte og sette søkelys...

Recent global warming affects species compositions at an unprecedented rate. To predict climate‐induced changes in species assemblages, a better understanding of the link between species occurrence and climate is needed. Macrofungal fruit body assemblages are correlated with the thermal environment at the European scale. However, it is still unknow...

In this report, we summarize the current state of knowledge and best estimates of how climate change is expected to impact Norwegian forest ecosystems from now to the year 2100

Global policy for future biodiversity conservation is ultimately implemented at landscape and local scales. In parallel, green infrastructure planning needs to account for socioeconomic dynamics at national and global scales. Progress towards policy goals must, in turn, be evaluated at the landscape scale. Evaluation tools are often environmental q...

The global increase in demand for wood products, calls for a more sustainable management of forests to optimize both the production of wood and the conservation of forest biodiversity. In this paper, we evaluate the status and future trends of forest birds in Central European forests, assuming different forest management scenarios that to a varying...

The panel-based assessment of ecosystem condition (PAEC) is an evidence-based ap-proach to assess the condition of Norwegian ecosystems. The assessment is carried out by an expert panel with broad expertise in the ecosystems to be assessed and is inspired by approaches used in international assessments such as IPCC and IPBES. The assessment follows...

Climate change has considerably dominated science-policy dialogue, public debate, and subsequently environmental policies since the three “Rio Conventions” were born. This has led to practically independent courses of action of climate change mitigation and biodiversity conservation actions, neglecting potential conflicts among outcomes and with mi...

Genome sequencing of spatially distributed individuals sheds light on how evolution structures genetic variation. Populations of Phellopilus nigrolimitatus, a red-listed wood-inhabiting fungus associated with old-growth coniferous forests, have decreased in size over the last century due to a loss of suitable habitats. We assessed the population ge...

Taxonomy of Basidiodendron caesiocinereum complex is revised based on morphological and molecular methods (with the use of nc LSU rDNA, ITS and TEF1 regions). The basidiospore ornamentation is justified as a key morphological character for the species recognition in the group. As redefined here, B. caesiocinereum is an angiosperm-dwelling species w...

Surveying and monitoring biodiversity using new technology: eDNA and camera trapping. NINA Report 1962. Norwegian Institute for Nature Research. Norway has committed to halting the loss of biodiversity. However, preserving biodiversity requires knowledge about species distributions. For some species we have good knowledge of distribution and popul...

There were errors in the name of author László G. Nagy and in affiliation no. 31 in the original publication. The original article has been corrected.

Sporocarps (fruit bodies) are the sexual reproductive stage in the life cycle of many fungi. They are highly nutritious and consequently vulnerable to grazing by birds and small mammals, and invertebrates, and can be infected by microbial and fungal parasites and pathogens. The complexity of communities thriving inside sporocarps is largely unknown...

Long‐term metapopulation persistence is mediated by the dynamics of colonization and extinction. To understand and predict future species occupancy in changing landscapes, we must account for the dynamic rates that shape the occupancy and disentangle their dependence on environmental conditions. Specialist and generalist species may differ in their...

The cryptic lifestyle of most fungi necessitates molecular identiication of the guild in environmental studies. Over the past decades, rapid development and afordability of molecular tools have tremendously improved insights of the fungal diversity in all ecosystems and habitats. Yet, in spite of the progress of molecular methods, knowledge about f...

This report discusses approximate estimations of the carbon budgets within Norway’s mainland ecosystems. It stands as an initial overview of the natural potential of carbon storage and sequestration in Norwegian ecosystems. We describe carbon cycling in five key ecosystem groups: forest, alpine and cryosphere, agriculture and grassland, wetland, an...

Understanding spatiotemporal population trends and their drivers is a key aim in population ecology. We further need to be able to predict how the dynamics and sizes of populations are affected in the long term by changing landscapes and climate. However, predictions of future population trends are sensitive to a range of modeling assumptions. Dead...

Unlike for many other organism groups, conservation translocations of fungi are still rare. Encouraged by recent successful translocations, there is a growing interest in applying this conservation tool to threatened wood-inhabiting fungi. When combined with other conservation or restoration measures, translocation can be an effective measure for p...

Understanding spatiotemporal population trends and their drivers is a key aim in population ecology. We further need to be able to predict how the dynamics and sizes of populations are affected in the long term by changing landscapes and climate. However, predictions of future population trends are sensitive to a range of modelling assumptions. Dea...

Article impact statement: Use occurrence patterns and spatial population dynamics of deadwood‐dependent organisms to evaluate importance of spatial habitat configuration.

p>Thermal melanism theory states that dark-colored ectotherm organisms are at an advantage at low temperature due to increased warming. This theory is generally supported for ectotherm animals, however, the function of colors in the fungal kingdom is largely unknown. Here, we test whether the color lightness of mushroom assemblages is related to cl...

Functional traits are widely recognized as a useful framework for testing mechanisms underlying species community assemblage patterns and ecosystem processes. Functional trait studies in the plant and animal literature have burgeoned in the past 20 years, highlighting a need for standardized ways to measure ecologically meaningful traits across tax...

The taxonomy of the corticioid fungi from the class Atractiellomycetes (Pucciniomycotina, Basidiomycetes) currently addressed to the genus Helicogloea, is revised based on morphological and nuclear ribosomal DNA (ITS and LSU) data. The genus is restricted to 25 species with semitranslucent, gelatinous basidiocarps lacking differentiated cystidia an...

Arters egenskaper er relevant for populasjonsdynamikk på tvers av tid og rom og omfatter bl.a. morfologiske, demografiske, biokjemiske, fysiologiske og atferdsmessige karaktertrekk hos artene. Arter er viktig for økosystemprosesser gjennom å regulere populasjonsnivået av andre arter direkte gjennom biotisk kontroll (sykdom, predasjon, parasittisme)...

Isolation of habitats in space and time affects species globally and in a multitude of ecosystems. It is however often difficult to assess the level of isolation from the point of view of the focal species. Indicator species are often used to assess 'conservation value' of habitats. One such approach involves the use of wood-decaying fungal species...

Species occurrence observations are increasingly available for scientific analyses through citizen science projects and digitization of museum records, representing a largely untapped ecological resource. When combined with open-source data, there is unparalleled potential for understanding many aspects of the ecology and biogeography of organisms....

The extensive spatial and temporal coverage of many citizen science datasets (CSD) makes them appealing for use in species distribution modeling and forecasting. However, a frequent limitation is the inability to validate results. Here, we aim to assess the reliability of CSD for forecasting species occurrence in response to national forest managem...

High amounts of driftwood sail across the oceans and provide habitat for organisms tolerating the rough and saline environment. Fungi have adapted to the extremely cold and saline conditions which driftwood faces in the high north. For the first time, we applied high-throughput sequencing to fungi residing in driftwood to reveal their taxonomic ric...

The first records of Occultifur corticiorum, Spiculogloea occulta, S. subminuta (Pucciniomycotina), Phragmoxenidium mycophilum and Serendipita sigmaspora (Agaricomycotina) from Norway and Sweden are treated, and morphological characters and ecology of these species are discussed. In addition, Spiculogloea limonispora and S. minuta are reported as n...

Figure S1. The change in germinability over time (h) in the control (dark at 25°C), light (simulated sunlight at 25°C) and freezing (dark at −25°C) treatments.

Appendix S1. Sampling the posterior distributions of the Hierarchical Community Model parameters.

Appendix S2. Plots of the species-specific responses to the light and freezing treatments.

Assessment of the costs and benefits of dispersal is central to understanding species' life-history strategies as well as explaining and predicting spatial population dynamics in the changing world. While mortality during active movement has received much attention, few have studied the costs of passive movement such as the airborne transport of fu...

We studied fungal succession in decaying wood by compiling time-series data of fruit body observations. We tested the hypothesis that the presence of a primary species affects the probability of a succeeding species occurring later on the same log. Significant associations were detected for 15 species pairs; these were consistent with earlier findi...

Hitherto fungi have rarely been considered in conservation biology, but this is changing as the field moves from addressing single species issues to an integrative ecosystem‐based approach. The current emphasis on biodiversity as a provider of ecosystem services throws the spotlight on the vast diversity of fungi, their crucial roles in terrestrial...

Marine fungi are severely understudied in the polar regions. We used molecularly identified cultures to study fungi inhabiting 50 intertidal and sea-floor logs along the North Norwegian coast. The aim was to explore the taxonomic and ecological diversity and to examine factors shaping the marine wood-inhabiting fungal communities. The 577 pure cult...

The loss of suitable habitats is one of the main causes behind the loss of species and communities. Habitat fragmentation, that is, the division of the remaining habitat into small and isolated fragments, often co‐occurs with the process of habitat loss. The spatial division of habitats decreases connectivity among local populations and generally h...

Before the recent revolution in molecular biology, field studies on fungal communities were mostly confined to fruit bodies, whereas mycelial interactions were studied in the laboratory. Here we combine high-throughput sequencing with a fruit body inventory to study simultaneously mycelial and fruit body occurrences in a community of fungi inhabiti...

In terrestrial ecosystems, fungi are the major agents of decomposition processes and nutrient cycling and of plant nutrient uptake. Hence, they have a vital impact on ecosystem processes and the terrestrial carbon cycle. Changes in productivity and phenology of fungal fruit bodies can give clues to changes in fungal activity, but understanding thes...

Number of reads obtained from all OTUs, distributed on plant root systems and replicates. Top blast hits are shown along with identity, query coverage, and GC content of the representative sequence.

In this methodological study, we compare 454 sequencing and a conventional cloning and Sanger sequencing approach in their ability to characterize fungal communities PCR amplified from four root systems of the ectomycorrhizal plant Bistorta vivipara. To examine variation introduced by stochastic processes during the laboratory work, we replicated a...

Loss of old-growth forests and greatly reduced volumes of coarse dead wood in managed forests are the main reasons for the decline of many wood-inhabiting species in Europe and elsewhere. To assess the habitat requirements and extinction vulnerability of 13 polypore species associated mainly with spruce, their occurrences were recorded on 96 521 de...

When comparing environmental sequences with fully identified reference sequences, a common practice has been to rely on threshold values for sequence similarity. We develop a modelling approach that utilizes the self-consistency of the reference database to transfer sequence similarity to the probability of correct identification to a given taxonom...

Man has exploited land and forests in Western and Central Europe longer and more intensively than in Northern Europe and further east in Eurasia. We estimated forest naturalness and modelled expected biodiversity loss in seven different landscapes (2500 km2 each) in the Netherlands, Sweden, Finland, Poland, St. Petersburg (Western European Russia),...

Signals of species interactions can be inferred from survey data by asking if some species occur more or less often together than what would be expected by random, or more generally, if any structural aspect of the community deviates from that expected from a set of independent species. However, a positive (or negative) association between two spec...

1. Much of ecological research focuses on the responses of species and species communities to variation in the amount and quality of resources that are required for survival and reproduction. In such research, it is critical to measure the availability of resources in a manner that is relevant in relation to the ecological requirements of the speci...

Many polypores are specialized in their requirements for substrate and environment, and they have been suggested to indicate the continuity of coarse woody debris or naturalness of a forest stand. However, the use of polypores as indicators of conservation value is restricted by the temporally limited appearance of annual fruit bodies. We studied w...

Malagasy dung beetles have evolved with a diverse group of primates (lemurs), the largest extant native herbivores on the island. The two main radiations include the endemic subtribe Helictopleurina (65 species) and the tribe Canthonini with several endemic genera (c. 170 species), both of which occur primarily in forests and feed on lemur faeces a...

Preservation of small habitat patches termed as "woodland key habitats" or "especially important habitats" in the Finnish Forest Act has become an integral part of biodiversity- oriented forest management. Forest Act habitats belong to particular habitat types defined in the act, and they are supposed to have natural-like stand characteristics. How...

Despite much research on forest biodiversity in Fennoscandia, the exact mechanisms of species declines in dead-wood dependent fungi are still poorly understood. In particular, there is only limited information on why certain fungal species have responded negatively to habitat loss and fragmentation, while others have not. Understanding the mechanis...

Preservation of woodland key habitats has become an integral part of biodiversity-oriented forest management in northern Europe. In Finland, brook-side spruce forests constitute the most important key-habitat type in terms of total area and timber volume. Our aim was to compare polypore diversity and the occurrence of red-listed species between bro...

Kaikkialla maailmassa ponnistellaan viimeis- ten vielä jäljellä olevien luonnonmetsien säi- lyttämiseksi. Huoli tropiikin metsäkadosta on globaali, mutta myös luonnontilaisten boreaa- listen metsien säilyminen on uhattuna. Yli 1500 väitellyttä tutkijaa on tänä vuonna esittänyt pe- rustellun vetoomuksen Kanadan boreaalisten luonnonmetsien säilyttämi...