15 Works

Salmon louse infestation levels on sea trout can be predicted from a hydrodynamic lice dispersal model

Thomas Bøhn, Rune Nilsen, Karl Øystein Gjelland, Martin Biuw, Anne Sandvik, Raul Primicerio, Ørjan Karlsen, Rosa Serra-Llinares, Anne Dagrun Sandvik & Rosa Maria Serra‐Llinares
The abundance of the parasitic salmon louse has increased with the growth in aquaculture of salmonids in open net pens. This represents a threat to wild salmonid populations as well as a key limiting factor for salmon farming. The Norwegian ‘traffic light’ management system for salmon farming aims to increase aquaculture production while securing sustainable wild salmonid populations. However, this system is at present solely focusing on mortality in wild Atlantic salmon, while responses of...

Effects of disturbance on plant regrowth along snow pack gradients in alpine habitats

Marianne Evju, Dagmar Hagen & Annika Hofgaard
Human disturbance in alpine habitats is expected to increase, and improved knowledge of short-term recovery after disturbance events is necessary to interpret vegetation responses and formulate planning and mitigation efforts. The ability of a plant community to return to its original state after a disturbance (community resilience) depends on species composition and environmental conditions. The aim of this study is to analyze initial short-term effects of disturbance in alpine plant communities in contrasting climates (oceanic...

Time-series covering up to four decades reveals major changes and drivers of marine growth and proportion of repeat spawners in an Atlantic salmon population

Alison Harvey, Øystein Skaala, Reidar Borgstrøm, Per Tommy Fjeldheim, Kaja Fjeldheim, Kjell Utne, Ingrid Johnsen, Peder Fiske, Synne Winterthun, Sofie Knutar, Harald Sægrov, Kurt Urdal & Kevin Glover
1. Wild Atlantic salmon populations have declined in many regions and are affected by diverse natural and anthropogenic factors. To facilitate management guidelines, precise knowledge of mechanisms driving population changes in demographics and life history traits is needed. 2. Our analyses were conducted on a) age and growth data from scales of salmon caught by angling in the river Etneelva, Norway, covering smolt year classes from 1980 to 2018, b) extensive sampling of the whole...

Variation and correlation in the timing of breeding of North Atlantic seabirds across multiple scales

Katharine Keogan, Francis Daunt, Sarah Wanless, Richard Phillips, David Alvarez, Tycho Anker-Nilssen, Robert Barrett, Claus Bech, Peter Becker, Per-Arvid Berglund, Sandra Bouwhuis, Zofia Burr, Olivier Chastel, Signe Christensen-Dalsgaard, Sébastien Descamps, Tony Diamond, Kyle Elliott, Kjell Einar Erikstad, Mike Harris, Jonas Hentati-Sundberg, Martin Heubeck, Magdalene Langset, Svein Lorentsen, Heather Major, Mark Mallory … & Stephen Kress
Timing of breeding, an important driver of fitness in many populations, is widely studied in the context of global change, yet despite considerable efforts to identify environmental drivers of seabird nesting phenology, for most populations we lack evidence of strong drivers. Here we adopt an alternative approach, examining the degree to which different populations positively covary in their annual phenology to infer whether phenological responses to environmental drivers are likely to be (i) shared across...

A stream-to-sea experiment reveals inhibitory effects of freshwater residency on organic-matter decomposition in the sea

André Frainer & Scott Tiegs
One billion tons of carbon are annually transported to the global ocean, and the fate of this carbon hinges not only on marine processing rates, but also on freshwater processing during downstream transport. Using a cotton-strip assay we assessed the decomposition of organic matter in marine and freshwater sites and simulated its downstream transport from freshwater to the sea by translocating cotton strips approximately half-way through the freshwater incubation period. We observed faster decomposition in...

Monitoring genetic diversity with new indicators applied to an alpine freshwater top predator

Anastasia Andersson, Sten Karlsson, Nils Ryman & Linda Laikre
Genetic diversity is the basis for population adaptation and long-term survival, yet rarely considered in biodiversity monitoring. One key issue is the need for useful and straightforward indicators of genetic diversity. We monitored genetic diversity over 40 years (1970-2010) in metapopulations of brown trout (Salmo trutta) inhabiting 27 small mountain lakes representing 10 lake systems in central Sweden using >1200 fish per time point. We tested six newly proposed indicators; three were designed for broad,...

Timing and synchrony of birth in Eurasian lynx across Europe

Jenny Mattisson, John D.C. Linnell, Ole Anders, Elisa Belotti, Christine Breitenmoser-Würsten, Ludek Bufka, Christian Fuxjäger, Marco Heurich, Gjorge Ivanov, Włodzimierz Jędrzejewski, Radio Kont, Rafał Kowalczyk, Miha Krofel, Dime Melovski, Deniz Mengüllüoğlu, Tomma Lilli Middelhoff, Anja Molinari-Jobin, John Odden, Jānis Ozoliņš, Henryk Okarma, Jens Persson, Krzysztof Schmidt, Kristina Vogt, Fridolin Zimmermann & Henrik Andrén
The ecology and evolution of reproductive timing and synchrony has been a topic of great interest in evolutionary ecology for decades. Originally motivated by questions related to behavioural and reproductive adaptation to environmental conditions, the topic has acquired new relevance in the face of climate change. However, there has been relatively little research on reproductive phenology in mammalian carnivores. The Eurasian lynx (Lynx lynx) occurs across the Eurasian continent, covering three of the four main...

Population genomics of a forest fungus reveals high gene flow and climate adaptation signatures

Jørn Henrik Sønstebø, Emiliano Trucchi, Jenni Nordén, Inger Skrede, Otto Miettinen, Sajeet Haridas, Jasmyn Pangilinan, Igor V. Grigoriev, Francis Martin, Håvard Kauserud & Sundy Maurice
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 genetic structure and investigated local adaptation in P. nigrolimitatus, by establishing a reference genome and genotyping 327 individuals sampled from 24 locations in Northern Europe by RAD sequencing. We...

Climate influence on plant–pollinator interactions in the keystone species Vaccinium myrtillus

Marianne Evju, Siri L. Olsen, Jens Åström, Jørn O. Løkken, Sondre Dahle, Jonas L. Andresen & Nina E. Eide
Background: Climate change is altering the world’s ecosystems through direct effects of climate warming and precipitation changes, but also indirectly through changes in biotic interactions. For instance, climate-driven changes in plant and/or insect communities may alter plant-pollinator interactions, thereby influencing plant reproductive success and ultimately population dynamics of insect-pollinated plants. Methods: To better understand how the importance of insect pollination for plant fruit set varies with climate, we experimentally excluded pollinators from the partly selfing...

Data and R-scripts from: Multiple stressors: negative effects of nest predation on the viability of a threatened gull in different environmental conditions

Bård-Jørgen Bårdsen & Jan Ove Bustnes
This contains data and R-scripts used in: Bård-Jørgen Bårdsen and Jan Ove Bustnes (2022). Multiple stressors: negative effects of nest predation on the viability of a threatened gull in different environmental conditions. Journal of Avian Biology. This study assessed the population viability of a population of the lesser black-backed gull (Larus fuscus fuscus) using data collected during 2005-2020 from a nature reserve in Northern Norway. The study merged results from statistical analyses of empirical data...

Conserving on the edge: genetic variation and structure in northern populations of the endangered plant Dracocephalum ruyschiana L. (Lamiaceae)

Magni Olsen Kyrkjeeide, Kristine Bakke Westergaard, Oddmund Kleven, Marianne Evju, Anders Endrestøl, Marie Kristine Brandrud & Odd Stabbetorp
Loss of biodiversity is accelerating, including the loss of genetic diversity. Conservation of small, isolated populations may be important, as they can provide valuable contributions to overall genetic variation and long-term viability of species. Furthermore, such populations may play an essential role in adaptation to new environments following changes in e.g. land-use and climate. Dracocephalum ruyschiana is a threatened plant species throughout its European distribution, but 25% of the European populations are situated within Norway....

Measures of infrastructure, browsing, and tree recruitment in Norway

Anne Catriona Mehlhoop
The data have been used in a study on a possible trophic cascade of human activity close to human infrasturcture on moose browsing pressure and effects on tree recruitment in Norway. The data includes measures on distances to human infrastructure, browsing pressure, tree recruitment and several environmental variables, as well as variables connected to forestry. The datasets are as used for the analyses, while the original data are available from the Norwegian Forest Inventory, www.nibio.no)....

Estimating abundance in unmarked populations of Golden Eagle

Jennifer Stien, Stien Audun, Torkild Tveraa, Lars Rød-Eriksen & Nina Eide
1. Estimates of species abundance are of key importance in population and ecosystem level research but can be hard to obtain. Study designs using camera-traps are increasingly being used for large-scale monitoring of species that are elusive and/or occur naturally at low densities. 2. Golden eagle (Aquila chrysaetos) is one such species, and we investigate whether existing large-scale monitoring programs using baited camera-traps can be used to estimate the abundance of golden eagles, as an...

Circum-Arctic distribution of chemical anti-herbivore compounds arctic shrubs

Elin Lindén, Mariska Te Beest, Ilka Abreu, Thomas Moritz, Maja Sundqvist, Isabel C Barrio, Julia Boike, John Bryant, Kari Anne Bråthen, Agata Buchwal, Guillermo Bueno, Alain Cuerrier, Dagmar Egelkraut, Bruce Forbes, Martin Hallinger, Monique Heijmans, Luise Hermanutz, David S Hik, Annika Hofgaard, Milena Holmgren, Diane C Huebner, Toke Hoye, Ingibjörg Jónsdóttir, Elina Kaarlejärvi, Emilie Kissler … & Johan Olofsson
Spatial variation in plant chemical defence towards herbivores can help us understand variation in herbivore top-down control of shrubs in the Arctic and possibly also shrub responses to global warming. Less defended, non-resinous shrubs could be more influenced by herbivores than more defended, resinous shrubs. However, sparse field measurements limit our current understanding of how much of the circum-Arctic variation in defence compounds is explained by taxa or defence functional groups (resinous/non-resinous). We measured circum-Arctic...

Spatiotemporal monitoring of the rare Northern dragonhead, Dracocephalum ruyschiana (Lamiaceae): SNP genotyping and environmental niche modelling herbarium specimens

Malene Nygaard, Alexander Kopatz, James M.D. Speed, Michael D. Martin, Tommy Prestø, Oddmund Kleven & Mika Bendiksby
Aim: We have studied spatiotemporal genetic change in the Northern dragonhead, a plant species that has experienced a drastic population decline and habitat loss in Europe. We add a temporal perspective to the monitoring of dragonhead in Norway by genotyping herbarium specimens up to 200 years old. We also assess whether dragonhead has achieved its potential distribution in Norway. Location: Europe (mainly Norway) Methods: We have applied a microfluidic array consisting of 96 SNP markers...

Registration Year

  • 2022

Resource Types

  • Dataset


  • Norwegian Institute for Nature Research
  • Swedish University of Agricultural Sciences
  • The Arctic University of Norway
  • UiT The Arctic University of Norway
  • University of Edinburgh
  • University of Tartu
  • Norwegian University of Life Sciences
  • Bergen Energi (Norway)
  • Nofi Tromsø (Norway)
  • Centre national de la recherche scientifique