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Digestive contents and food webs record the advent of dinosaur supremacy
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-27)The early radiation of dinosaurs remains a complex and poorly understood evolutionary event<sup>1–4</sup> . Here we use hundreds of fossils with direct evidence of feeding to compare trophic dynamics across five vertebrate assemblages that record this event in the Triassic–Jurassic succession of the Polish Basin (central Europe). Bromalites, fossil digestive products, increase in size and diversity ... -
Insights into early animal evolution from the genome of the xenacoelomorph worm Xenoturbella bocki
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-29)The evolutionary origins of Bilateria remain enigmatic. One of the more enduring proposals highlights similarities between a cnidarian-like planula larva and simple acoel-like flatworms. This idea is based in part on the view of the Xenacoelomorpha as an outgroup to all other bilaterians which are themselves designated the Nephrozoa (protostomes and deuterostomes). Genome data can provide important ... -
Drivers of Interspecific Spatial Segregation in Two Closely-Related Seabird Species at a Pan-Atlantic Scale
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-11)Aim - Ecologically similar species living in sympatry are expected to segregate to reduce the effects of competition where resources are limiting. Segregation from heterospecifics commonly occurs in space, but it is often unknown whether such segregation has underlying environmental causes. Indeed, species could segregate because of different fundamental environmental requirements (i.e., ‘niche ... -
Holocene summer temperature reconstruction from plant sedaDNA and chironomids from the northern boreal forest
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-30)Climate-induced ecotonal shifts are expected to occur in the (sub)arctic and boreal zones in the coming decades. Understanding how these ecosystems have previously responded to climate change can provide greater insight into how ecosystems may develop under existing and future pressures. Here we present a Holocene record from Lake Horntjernet, a lake on the northern edge of the boreal forest in ... -
Dynamic home range of the grey-sided vole Craseomys rufocanus: a pilot study
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-15)Background Knowledge about home range size is vital to understand social systems and population dynamics of small mammals, as well as dispersal and a species’ landscape use. Home ranges have been mapped for some species of voles (subfamily Microtinae) but remain virtually unknown for many species, including the grey-sided vole Craseomys rufocanus. <p>Results A small pilot study was carried out ... -
Diversity, toxicity, and distribution of potentially toxic diatoms in Antarctic waters––With description of Pseudo-nitzschia meridionalis sp. nov. and P. glacialis sp. nov.
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-12)Diatoms of the genus Pseudo-nitzschia, known for their potential toxicity, are integral to the phytoplankton community of the Southern Ocean, which surrounds Antarctica. Despite their ecological importance, the diversity and toxicity of Pseudo-nitzschia in this region remain underexplored. Globally, these diatoms are notorious for forming harmful algal blooms in temperate and tropical waters, causing ... -
Papaver recircumscribed: A review of neighbouring Papaveraceae genera, including Afropapaver nom. et stat. nov. and Oreomecon, a large, Arctic-Alpine genus
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-29)Papaveraceae tribus Papavereae includes an American and a mainly Eurasian group of genera. The latter is proposed here to include eight genera. Amongst these, the recently described genus Oreomecon is phylogenetically a sister group to Meconopsis, a genus from Himalaya and central China, which is reviewed here as including 95 species and 21 subspecies. By contrast, Oreomecon has a circumpolar northern ... -
A new species of Dasyhelea Kieffer, 1911 (Diptera: Ceratopogonidae) visiting flowers of Aristolochia in France
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-26)Both sexes of Dasyhelea porczynskii Szadziewski, Blatrix et Dominiak, n. sp. collected from flowers of Aristolochia clematitis L. in southern France are described and illustrated. The new species is closely related to D. leptoclada Remm, 1967 female of which is briefly diagnosed for the first time. -
Boats from bogs in Arctic Norway: depositional contexts and explanatory frameworks in the Late Iron Age and Mediaeval period
(Chapter; Bokkapittel, 2024)A comprehensive assessment of boat-related bog finds from the collection of the Arctic University Museum of Norway (Norges Arktiske Universitetsmuseum, NAU) materialises the entanglement of boat technology and cultural meaning in northern Norway during the Iron Age. Nineteen boat parts and related equipment made of Scots pine (Pinus sylvestris) from 17 bog locations have been documented. As the Early ... -
A renaissance of microRNAs as taxonomic and phylogenetic markers in animals
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-21)Molecular markers for tracing animal sample origins and compositions are critical for applications such as parasite detection, contamination screening, and sample authentication. Among these, microRNAs have emerged as promising candidates due to their deep conservation, near-hierarchical evolution, and sta bility. I here review the suitability of microRNAs as taxonomic and also phylo genetic ... -
Microbial community composition unaffected by mycorrhizal plant removal in sub-arctic tundra
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-11)Vegetation changes in a warming Arctic may affect plant-associated soil microbial communities with possible consequences for the biogeochemical cycling of carbon (C) and nitrogen (N). In a sub-arctic tundra heath, we factorially removed plant species with ecto- and ericoid mycorrhizal associations. After two years, we explored how mycorrhizal type-specific plant removal influences microbial ... -
Extra-pair paternity and sperm length variation in a far northern Great Tit (Parus major) population
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-25)Extra-pair paternity is common among socially monogamous bird species and considered an important driver of post-copulatory sexual selection on ejaculate traits including sperm traits. Patterns of extra-pair paternity and sperm size both show substantial variation among populations, yet we know little about the expression of these key reproductive traits at high latitudes. Here we report patterns ... -
Bakestones in Northern Norway: An Archaeological Witness to Medieval Foodways and Maritime Trade
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-01)BAKESTONES ARE A 11TH-CENTURY EARLY MEDIEVAL INNOVATION associated with flatbread production that reflect a distinctive Norwegian food culture spanning some 600 years. Large scale manufacture of chlorite schist bakestones at Ølve-Hatlestrand, western Norway, was linked to further distribution in Norway from the port of Bergen. Bakestones were an important item of maritime trade transported to northern ... -
Greening of Svalbard
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-21)Svalbard, located between 76°30′N and 80°50′N, is among the regions in the world with the most rapid temperature increase. We processed a cloud-free time-series of MODIS-NDVI for Svalbard. The dataset is interpolated to daily data during the 2000–2022 period with 232 m pixel resolution. The onset of growth, with a clear phenological definition, has been mapped each year. Then the integrated NDVI ... -
Timing and extent of primary moult in breeding Black-legged Kittiwakes Rissa tridactyla at different colonies in the north-east Atlantic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-24)Timing of moult of the inner primaries by breeding Black-legged Kittiwakes is very similar among colonies ranging from southern England to northern Norway, but can be much later at very high-latitude colonies, such as at Svalbard, where breeding is delayed by the late spring thaw. Breeding adult Black-legged Kittiwakes almost all replaced the first and second (innermost) primary feathers on their ... -
Local climate modulates the development of soil nematode communities after glacier retreat
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-08)The worldwide retreat of glaciers is causing a faster than ever increase in ice-free areas that are leading to the emergence of new ecosystems. Understanding the dynamics of these environments is critical to predicting the consequences of climate change on mountains and at high latitudes. Climatic differences between regions of the world could modulate the emergence of biodiversity and functionality ... -
Hagfish genome elucidates vertebrate whole-genome duplication events and their evolutionary consequences
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-12)Polyploidy or whole-genome duplication (WGD) is a major event that drastically reshapes genome architecture and is often assumed to be causally associated with organismal innovations and radiations. The 2R hypothesis suggests that two WGD events (1R and 2R) occurred during early vertebrate evolution. However, the timing of the 2R event relative to the divergence of gnathostomes ( jawed vertebrates) ... -
Ancient DNA and osteological analyses of a unique paleo-archive reveal Early Holocene faunal expansion into the Scandinavian Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-29)Paleo-archives are essential for our understanding of species responses to climate warming, yet such archives are extremely rare in the Arctic. Here, we combine morphological analyses and bulk-bone metabarcoding to investigate a unique chronology of bone deposits sealed in the high-latitude Storsteinhola cave system (68°50′ N 16°22′ E) in Norway. This deposit dates to a period of climate warming ... -
LocoGSE, a sequence-based genome size estimator for plants
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-13)Extensive research has focused on exploring the range of genome sizes in eukaryotes, with a particular emphasis on land plants, where significant variability has been observed. Accurate estimation of genome size is essential for various research purposes, but existing sequence-based methods have limitations, particularly for low-coverage datasets. In this study, we introduce LocoGSE, a novel ... -
Uncovering Holocene climate fluctuations and ancient conifer populations: Insights from a high-resolution multi-proxy record from Northern Finland
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-08)A series of abrupt climate events linked to circum-North Atlantic meltwater forcing have been recognised in Holocene paleoclimate data. To address the paucity of proxy records able to characterise robustly the regional impacts of these events, we retrieved a sub-centennial resolution, well-dated core sequence from Lake Kuutsjarvi, ¨ northeast Finland. By analysing a range of paleo-environmental ...
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