A5070241337- Botany and Plant Ecology Studies
- Species Distribution and Climate Change
- Peatlands and Wetlands Ecology
- Forest Ecology and Biodiversity Studies
- Lichen and fungal ecology
- Marine and fisheries research
- Forest Management and Policy
- Land Use and Ecosystem Services
- Ecology and Vegetation Dynamics Studies
- Fish Ecology and Management Studies
- Ecology and biodiversity studies
- Marine and coastal plant biology
- Indigenous Studies and Ecology
- Wildlife-Road Interactions and Conservation
- Wildlife Ecology and Conservation
- Plant and animal studies
- Soil and Water Nutrient Dynamics
- Geographic Information Systems Studies
- Coastal wetland ecosystem dynamics
- Environmental Conservation and Management
- Aquatic Ecosystems and Phytoplankton Dynamics
- Environmental DNA in Biodiversity Studies
- Remote Sensing and Land Use
- Genetic diversity and population structure
- Plant Ecology and Soil Science
Norwegian Institute for Nature Research
2009-2024
University of Oslo
2008-2021
American Museum of Natural History
2008-2014
Natural History Museum
2008
We provide the first comparative multispecies analysis of spatial genetic structure and diversity in circumpolar Arctic using a common strategy for sampling analyses. aimed to identify explain potential general patterns discontinuity/connectivity diversity, compare our findings with previously published hypotheses. collected analyzed 7707 samples 17 widespread arctic-alpine plant species amplified fragment length polymorphisms (AFLPs). Genetic structure, distinctiveness were each species,...
Abstract The main aim of this paper is to address consequences climate warming on loss habitat and genetic diversity in the enigmatic tropical alpine giant rosette plants using Ethiopian endemic Lobelia rhynchopetalum as a model. We modeled suitability L . assessed how its range affected under two models four emission scenarios. used three statistical algorithms calibrated represent different complexity levels response. analyzed amplified fragment length polymorphisms impact projected loss....
Abstract Globally, climate change greatly impacts the production of major crops, and there have been many attempts to model future yields under warming scenarios in recent years. However, projections may not be generalisable all crop growing regions, particularly those with diverse topography bioclimates. In this study, we demonstrate by evaluating links between changes temperature precipitation wheat, barley, potato at county-level during 1980–2019 Norway, a Nordic country range climates...
Abstract The state of sea trout in 1251 Norwegian watercourses was assessed based on a scoring system for human pressures, abundance data, and local knowledge. Over 16,000 km rivers lakes were available to these watercourses, spanning from the temperate Arctic regions. Sea classified be good or very fewer than 25% poor almost 40%. Twenty‐nine had lost their populations. Salmon lice aquaculture salmon farms by far largest adverse effect among impact factors, both number (83%) river area...
Pelagic crustacean zooplankton were collected from 336 Norwegian lakes covering a wide range of latitude, altitude, lake area, mean depth, production (as chlorophyll a), and fish community structure. Mean species richness during the ice-free season was generally low at high latitudes altitudes. Further, lower recorded in western lakes, possibly reflecting constraints on migration dispersal. However, despite obvious spatial limitations, geographic boundaries only weak predictors richness....
Abstract Aim The main aims of this study are: (1) to test if temperature and related parameters are the primary determinants regional distribution macrofungi (as is commonly recognized for plants); (2) success modelling fungal patterns depends on species characteristics; (3) explore potential using herbarium data predicting species’ distributions. Location area, Norway, spans 58–71° N latitude 4–32° E longitude, embraces extensive ecological gradients in a small area. Methods based 1020...
Human population expansion and associated degradation of the habitat many wildlife species cause loss biodiversity extinctions. The small Simen Mountains National Park in Ethiopia is one last strongholds for preservation a number afro-alpine mammals, plants birds, it home to rare endemic Walia ibex, Capra walie. narrow distribution range this as well potential competition resources with livestock, especially domestic goat, hircus, may compromise its future survival. Based on curated...
Maximum entropy (MaxEnt) modelling, as implemented in the Maxent software, has rapidly become one of most popular methods for distribution modelling. Originally, MaxEnt was described a machine‐learning method. More recently, it been explained from principles Bayesian estimation. offers numerous options (variants method) and settings (tuning parameters) to users. A widespread practice accepting software's default established, likely because ecologists’ lack familiarity with statistical...
Abstract Aim To assess the scale of variation for major environmental gradients in Norway. obtain a step‐less model this and to use evaluate extent which consensus expert classification Norway into vegetation regions can be predicted from variables. discuss potential models understanding natural at regional scales, stratification predictive modelling species distributions land‐cover types. Location The mainland Methods Fifty‐four climatic, topographical, hydrological geological variables...
What are the relative contribution of temperature and solar irradiance as types energy deliveries for species richness at ecosystem level? In order to reveal this question in lake ecosystems, we assessed zooplankton 1891 Norwegian lakes covering a wide range latitude, altitude, area. Geographical variables could largely be replaced by temperature‐related variables, e.g. annual monthly maximum or growth season. Multivariate analysis (PCA) revealed that not only temperature, but also input...
Abstract Bekkby, T., Rinde, E., Erikstad, L., and Bakkestuen, V. 2009. Spatial predictive distribution modelling of the kelp species Laminaria hyperborea. – ICES Journal Marine Science, 66: 2106–2115. The hyperborea constitutes highly productive forest systems hosting a broad diversity providing basis for commercial harvesting and, through its productivity, fishing industry. planning management this important habitat resource needs to be based on maps detailed knowledge main factors...
Abstract Bekkby, T., Rinde, E., Erikstad, L., Bakkestuen, V., Longva, O., Christensen, Isæus, M., and Isachsen, P. E. 2008. Spatial probability modelling of eelgrass (Zostera marina) distribution on the west coast Norway. – ICES Journal Marine Science, 65: 1093–1101. Based modelled measured geophysical variables presence/absence data Zostera marina, we developed a spatial predictive model for Z. marina. Our analyses confirm previous reports show that finding marina is at its highest in...
Riverine biofilms remain one of the least-studied habitats despite significant increase in examination aquatic microbial communities recent years. In this study, dynamics epilithic biofilm native on rocks from a low-order upland stream were examined over period 3 Spatial and temporal variations bacterial assessed using terminal restriction fragment length polymorphism, based analysis 16S rRNA gene. total, 108 samples analysed 170 different ribotypes detected. A strong gradient ribotype...
Abstract Aim Previous research on how climatic niches vary across species ranges has focused a limited number of species, mostly invasive, and not, to date, been very conclusive. Here we assess the degree niche conservatism between distant populations native alpine plant that have separated for thousands years. Location European A lps F ennoscandia. Methods Of studied pool 888 terrestrial vascular occurring in both ennoscandia, used two complementary approaches test quantify climatic‐niche...
The delineating of bedrock from sediment is one the most important phases in fundamental process regional identification and mapping, it usually manually performed using high-resolution optical remote-sensing images or Light Detection Ranging (LiDAR) data. This task, although straightforward, time consuming requires extensive specialized labor. We contribute to this line research by proposing an automated approach that uses cloud computing, deep learning, fully convolutional neural networks,...
Several studies have documented relationships between wave exposure and distribution, density, size of marine species. Hence, this factor is at a high level in the hierarchical habitat classification system EUNIS one Water Framework Directive water typology criteria coastal waters. Isæus (2004) Isæus, M. 2004. Factors structuring Fucus communities open complex coastlines Baltic Sea. Doctoral thesis, Department Botany, Stockholm University, Sweden. Downloadable from...
Abstract Reddin, D. G., Hansen, L. P., Bakkestuen, V., Russell, I., White, J., Potter, E. C. E., Dempson, J. B., Sheehan, T. F., Ó Maoiléidigh, N., Smith, G. W., Isaksson, A., Jacobsen, Fowler, M., Mork, K. and Amiro, P. 2012. Distribution biological characteristics of Atlantic salmon (Salmo salar) at Greenland based on the analysis historical tag recoveries. – ICES Journal Marine Science, 69: 1589–1597. In this study, we examined 5481 records recoveries from a new tagging database held by...
A 1680 km 2 coastal archipelago area in Norway around Sandøy (62°N 6°E), with a resident population of approximately 750 harbour seals was modelled geographic information system (GIS). The proportions different habitat types available to for foraging were estimated. Empirical data on levels activity and VHF radio-tracked used parameterise an energetics simulation model based activity, body size, composition. harbour-seal energy requirement simulated period from 20 June 31 August. diet the...
Abstract: Question: Does the understorey vegetation of Norwegian boreal forests change in relation to broad‐scale, long‐term changes? Location: Norway. Methods: Permanently marked 1‐m 2 plots from 17 monitoring reference areas dominated by Picea abies (11 areas, 620 plots) and Betula spp. (six 300 were analysed twice, at start 1988–1997 5 yr later (1993–2002). Species subplot frequency data separately for each area univariate multivariate statistical methods; 5‐yr changes single species...
Abstract Jacobsen, J. A., Hansen, L. P., Bakkestuen, V., Halvorsen, R., Reddin, D. G., White, J., Ó Maoiléidigh, N., Russell, I.C., Potter, E. C. E., Fowler, M., Smith, G. W., Mork, K. Isaksson, Oskarsson, S., Karlsson, L., and Pedersen, S. 2012. Distribution by origin sea age of Atlantic salmon (Salmo salar) in the around Faroe Islands based on analysis historical tag recoveries. – ICES Journal Marine Science, 69: 1598–1608. A database 2651 tags applied to smolts 13 countries or...
We explored the applied use of distribution modelling as a tool for making spatial predictions occurrences red‐listed vascular plant species Scorzonera humilis in study area southeast Norway. is typical extensively managed semi‐natural grasslands. A Maxent model was trained on all known records species, accurately georeferenced and gridded to fine resolution (grid cells 25×25 m). Model performance assessed training data by data‐splitting (by which some were set off evaluation) independent...