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Larsen J.,Agder Natural History Museum and Botanical Garden | Appleby P.G.,University of Liverpool | Christensen G.N.,Akvaplan Niva | Berg T.,StatoilHydro Research Center | Eide I.,StatoilHydro Research Center
Water, Air, and Soil Pollution | Year: 2010

Sediment cores collected from 12 lakes and eight marine sites along the Norwegian and Svalbard coast as part of a project investigating polycyclic aromatic hydrocarbons (PAH) in sediments were dated radiometrically using 210Pb, 137Cs and 241Am fallout radionuclides. In all lake cores, except on Svalbard, the 137Cs activity versus depth profile appears to have been significantly modified by post-depositional migration within the sediment column. The relatively low 137Cs inventories suggest that these sites were not significantly impacted by fallout from the 1986 Chernobyl accident. All the marine cores have 137Cs inventories that are substantially lower than in lake sediments almost certainly due to leaching of 137Cs from the marine sediments due to higher solubility in the seawater. In the marine surface sediments, the unsupported 210Pb concentrations are up to an order of magnitude lower than in the corresponding lake sediments reflecting the higher (dry mass) sedimentation rate at the marine sites. Five of the cores including marine sites and lakes have unusual high 210Pb flux most likely due to sediment focusing. Most of the irregularities in the 210Pb records seem to be due to slump events but some patterns are also due to possibly increased accumulation rates. Three of the marine cores show systematic increase in their sedimentation rate from c.1960 towards the present while only one lake shows the same systematic increase. © 2009 Springer Science+Business Media B.V. Source


Solheim R.,Agder Natural History Museum and Botanical Garden | Jacobsen K.-O.,Norwegian Institute for Nature Research | Oien I.J.,Norwegian Ornithological Society | Aarvak T.,Norwegian Ornithological Society | Polojarvi P.,Metsahallitus
Ornis Norvegica | Year: 2013

Blackflies (Simuliidae) have been shown to influence birds negatively in several ways. In 2011, during a peak lemming year, we found that two of 28 nests of Snowy Owls Bubo scandiacus in Northern Norway and Finland failed due to blackfly attacks on the incubating female. The observations also suggest that adult survival may be influenced by these insects. The owls' choice of breeding habitat can be decisive in their vulnerability to blackflies. Source


Raberg L.,Lund University | Loman J.,Lund University | Hellgren O.,Lund University | van der Kooij J.,Norwegian Zoological Society | And 2 more authors.
Acta Theriologica | Year: 2013

The harvest mouse (Micromys minutus) occurs throughout most of continental Europe. There are also two isolated and recently discovered populations on the Scandinavian peninsula, in Sweden and Norway. Here, we investigate the origin of these populations through analyses of mitochondrial DNA. We found that the two populations on the Scandinavian peninsula have different mtDNA haplotypes. A comparison of our haplotypes to published sequences from most of Europe showed that all Swedish and Norwegian haplotypes are most closely related to the haplotypes in harvest mice from Denmark. Hence, the two populations seem to represent independent colonisations but originate from the same geographical area. We discuss the age of the Swedish and Norwegian populations and suggest that both have been introduced recently. © 2012 Mammal Research Institute, Polish Academy of Sciences, Białowieża, Poland. Source


Kleven O.,Norwegian Institute for Nature Research | Aarvak T.,BirdLife Norway | Jacobsen K.-O.,Norwegian Institute for Nature Research | Solheim R.,Agder Natural History Museum and Botanical Garden | Oien I.J.,BirdLife Norway
European Journal of Wildlife Research | Year: 2016

Genetic analysis has shown to be an important and efficient method for monitoring species, but the lack of genetic markers constrains such monitoring for many species. Here, we cross-amplified microsatellite loci in the snowy owl (Bubo scandiacus) using primers previously characterized in other species. Among polymorphic loci, we selected 12 loci that amplified relatively short fragments (<250 base pairs) to facilitate genotyping of moulted feathers and other non-invasively collected samples. These 12 loci, and a sex-typing marker, were amplified in two multiplex PCR sets and used to screen 49 snowy owls from a northern European population. The number of alleles observed at single loci was 2 to 17. Expected and observed heterozygosity ranged from 0.12 to 0.91 and from 0.12 to 0.96, respectively. The combined probability of identity for the 12 loci was 5.7 × 10−11. Our multiplex PCR assays are expected to be useful for genetic monitoring, parentage analysis, and population genetic studies of the snowy owl. © 2016 Springer-Verlag Berlin Heidelberg Source


Eide I.,Statoil | Berg T.,Statoil | Thorvaldsen B.,Statoil | Christensen G.N.,Akvaplan Niva | And 2 more authors.
Water, Air, and Soil Pollution | Year: 2011

Polycyclic aromatic hydrocarbons (PAH) have been identified and quantified in dated layers of freshwater and marine sediments in Norway. Furthermore, profiles of the individual PAH (22 different) have been used to evaluate possible PAH sources. There is a significant increase in total PAH levels (sum of the 22 PAH) in freshwater sediments from the south-western part of Norway representing the 1800-1950 period, whereas the concentrations have decreased with a factor of approximately four since the 1950s. This pronounced trend was observed in two independent surveys. In northern Norway, the PAH levels in lake sediments have increased slightly during the past decades. In spite of this, the levels are considerably lower than in lake sediments from the south-western part of Norway. In fact, the PAH levels are decreasing northwards on the Norwegian mainland for both freshwater and marine surface sediments. Generally, the regional total PAH levels are higher (three to four times) in freshwater sites compared to the corresponding marine sites. Results of PAH source allocation indicate that pyrogenic sources are important in almost all sediment samples studied. Sediment samples were also collected at Svalbard where the local coal reserve is the major contributor to PAH. © Springer Science+Business Media B.V. 2010. Source

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