Now showing items 1-10 of 103
Where do the treeless tundra areas of northern highlands fit in the global biome system: toward an ecologically natural subdivision of the tundra biome
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-12-15)
According to some treatises, arctic and alpine sub-biomes are ecologically similar, whereas others find them highly dissimilar. Most peculiarly, large areas of northern tundra highlands fall outside of the two recent subdivisions of the tundra biome. We seek an ecologically natural resolution to this long-standing and far-reaching problem. We studied broad-scale patterns in climate and ...
Benthic algal vegetation in Isfjorden, Svalbard
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-08-11)
Benthic algal vegetation was investigated at 10 sites in Isfjorden, Svalbard. Five sites were visited during summer 2010 and five during summer 2012. Both the littoral and sublittoral vegetation were sampled, the littoral by hand-picking and use of a throwable rake and the sublittoral using a triangular dredge. A total of 88 different taxa were registered, comprising 17 Chlorophyta, 40 Ochrophyta, 30 ...
A Simulation Model to Evaluate an Emergency Response System for Offshore Helicopter Ditches
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-12-06)
A simulation model that supports the planning of an offshore emergency response system is presented. This model is based on official guidelines for offshore preparedness and can be used to evaluate different designs of an emergency system in respect to quantity, performance and location of Search-and-Rescue helicopters by modeling the coverage of the area under consideration. The model is ...
The relationship between patterns of benthic fauna and zooplankton in the Chukchi Sea and physical forcing
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09)
Using data from a number of summer surveys of the Chukchi Sea over the past decade, we investigate aspects in which the benthic fauna, sediment structure, and zooplankton there are related to circulation patterns and shelf hydrographic conditions. A flow speed map is constructed that reveals the major pathways on the shelf. Regions of enhanced flow speed are dictated by lateral constrictions—i ...
Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-03-23)
Prey preference of top predators and energy flow across habitat boundaries are of fundamental importance for structure and function of aquatic and terrestrial ecosystems, as they may have strong effects on production, species diversity, and food-web stability. In lakes, littoral and pelagic food-web compartments are typically coupled and controlled by generalist fish top predators. However, the ...
A deliberative approach to valuation and precautionary management of cold water corals in Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-06-17)
This paper explores management challenges in relation to human impacts on cold water corals (CWC) in Norway. CWC are a slow growing organism about which there is uncertainty regarding distribution and values. We discuss area closures to protect this environmental public good against destructive fishing practices. Focus groups were combined with questionnaires to inform precautionary management ...
Mapping species distributions: a comparison of skilled naturalist and lay citizen science recording
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-27)
To assess the ability of traditional biological recording schemes and lay citizen science approaches to gather data on species distributions and changes therein, we examined bumblebee records from the UK’s national repository (National Biodiversity Network) and from BeeWatch. The two recording approaches revealed similar relative abundances of bumblebee species but different geographical distributions. ...
Deeper snow alters soil nutrient availability and leaf nutrient status in high Arctic tundra
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-02-24)
Nitrogen (N) mineralization, nutrient availability, and plant growth in the Arctic are often restricted by low temperatures. Predicted increases of cold-season temperatures may be important for plant nutrient availability and growth, given that N mineralization is also taking place during the cold season. Changing nutrient availability may be reflected in plant N and chlorophyll content and lead to ...
Highly overlapping winter diet in two sympatric lemming species revealed by DNA metabarcoding
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-01-30)
Sympatric species are expected to minimize competition by partitioning resources, especially when these are limited. Herbivores inhabiting the High Arctic in winter are a prime example of a situation where food availability is anticipated to be low, and thus reduced diet overlap is expected. We present here the first assessment of diet overlap of high arctic lemmings during winter based on DNA ...
Case Sensitive? A review of the literature on the use of case method in entrepreneurship research
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015)