Salmon louse (Lepeophtheirus salmonis) is a parasitic copepod that causes significant damage to Atlantic salmon (Salmo salar) and incurs significant costs to the salmonid aquaculture industry. In Norway, the industry has been coping with salmon lice issues with various methods such as chemical treatments, but it has resulted in an acquisition of resistance in salmon lice towards the existing delousing ...

Polar cod (Boreogadus saida) are particularly vulnerable to climate change. Increasing our knowledge of polar cod development will help improve our understanding of the impact of climate change and the impacts this might have on the population. This study aimed at characterizing the development of Polar cod from fertilisation to 86 days post fertilisation (dpf) at two temperatures within their ...

The harbour porpoise is a key predator in Norwegian coastal communities, therefore studying its feeding ecology is important to understand its ecological role and may shed light on the dynamics of Norwegian coastal ecosystems. The diet of 134 harbour porpoises bycaught in Autumn 2016 (n = 61) and Spring 2017 (n = 73) in Norwegian coastal waters and fjords was investigated using both stable isotopes ...

Empetrum nigrum is a plant common in northern ecosystems with capacity to produce allelopathic compounds, which among other effects inhibit seed establishment and germination of other plants. Some of the most studied compounds regarding this effect are batatasin-III and phenolic acids, among them caffeic acid, which account for a large proportion of the leaf’s biomass. 5 random sites were established ...

The vast majority of studies in northern lake systems have been carried out on a short-term scale, principally during spring and summer and mostly focusing on a single parasite species. There are few winter studies of fish parasites in the subarctic area, and even less regarding seasonal variations in the sub-communities of intestinal parasites in Arctic charr (Salvelinus alpinus) and brown trout ...

Zooplankton patchiness has been documented in many shelf areas and is of vital importance for understanding predator-prey relationships in pelagic marine systems. By combining hydrographic, acoustic and net data collected in spring 2017, we present a detailed understanding of the extent of this phenomenon in the Lofoten-Vesterålen region. Such patches are of potential interest not only for zooplankton ...

The Arctic ecosystems and its species are under increased anthropogenic pressure from both climate change and industrial activities. Of special interest is pollution from petrogenic substances, and in particular accidental oil spills, that pose a risk to arctic marine organisms. An oil spill in the Arctic may see crude oil encapsulated into the sea ice and over time leaching to surface waters in the ...

Rapidly rising temperatures are having great effects on the high arctic ecosystem, historically characterized by long, cold winter periods, and cold dry summers. Due to the length of the winter season, arctic soils have been an important carbon sink, but may now be facing increased microbial activity due to increasing temperatures. Temperature, moisture, and litter quality play important roles in ...

This study represents one of the first studies that has explored the spatial and temporal differences in diving behaviour of weaned harp seal pups (Pagophilus groenlandicus) from the Greenland Sea stock. The study is also the first to map the weaned harp seal pups from the Greenland Sea population. In April 2017, newly weaned harp seal pups (n=26) from the Greenland Sea stock were tagged with satellite ...

The Common guillemot (Uria aalge) is a monomorphic seabird who exhibits two colour morphs: a bridled and an unbridled. The aim of this study was to investigate which effect parental sex and morph had on the daily chick feeding frequency and during the chick-rearing period. To assess this, two fixed time-lapse cameras were used to document the chick feeding frequency for 27 Common guillemot families ...