Artikler, rapporter og annet (arktisk og marin biologi): Nye registreringer
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Brucella pinnipedialis in hooded seal (Cystophora cristata) primary epithelial cells
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-01-25)Background: Marine Brucella spp. have been isolated from numerous pinniped and cetacean species, but pathological findings in association with infection with Brucella pinnipedialis in pinnipeds have been sparse. The capacity of brucellae to survive and replicate within host macrophages underlies their important ability to produce chronic infections, but previous work has shown that B. pinnipedialis ... -
A critical review of the Mediterranean sea turtle rescue network: a web looking for a weaver
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-06-16)A key issue in conservation biology is recognizing and bridging the gap between scientific results and specific action. We examine sea turtles—charismatic yet endangered flagship species—in the Mediterranean, a sea with historically high levels of exploitation and 22 coastal nations. We take sea turtle rescue facilities as a visible measure for implemented conservation action. Our study yielded ... -
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 ... -
Modification of sunlight radiation through colored photo-selective nets affects anthocyanin profile in Vaccinium spp. berries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-08-19)<p>Objectives In recent years, the interest on the effects of the specific wavelengths of the light spectrum on growth and metabolism of plants has been increasing markedly. The present study covers the effect of modified sunlight conditions on the accumulation of anthocyanin pigments in two Vaccinium species: the European wild bilberry (V. myrtillus L.) and the cultivated highbush blueberry ... -
Own,but not foreign seminal fluid inhibits sperm activation in a vertebrate with external fertilization
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-08-03)Seminal fluids are known to have a variety of effects on rival sperm, but in externally fertilizing species it is still unclear what effects seminal fluid can induce under sperm competition. We recorded sperm activity from natural ejaculates (including own seminal fluid) of an external fertilizer, the Arctic charr (Salvelinus alpinus), after activation either in water (the natural medium for ... -
Detection of Transgenes in Local Maize Varieties of Small-Scale Farmers in Eastern Cape, South Africa
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-12-31)Small-scale subsistence farmers in South Africa have been introduced to genetically modified (GM) crops for more than a decade. Little is known about i) the extent of transgene introgression into locally recycled seed, ii) what short and longterm ecological and socioeconomic impacts such mixing of seeds might have, iii) how the farmers perceive GM crops, and iv) to what degree approval conditions ... -
The intensity of horizontal and vertical search in a diving forager the harbour seal
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-05-27)<p>Background: Free ranging foraging animals can vary their searching intensity in response to the profitability of the environment by modifying their movements. Marine diving animals forage in a three dimensional space and searching intensity can be varied in both the horizontal and vertical planes. Therefore understanding the relationship between the allocation of searching effort in these two ... -
Phylogenetic and genomic analysis of Methanomassiliicoccales in wetlands and animal intestinal tracts reveals clade-specific habitat preferences
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-27)Methanogenic Thermoplasmata of the novel order Methanomassiliicoccales were recently discovered in human and animal gastro-intestinal tracts (GITs). However, their distribution in other methanogenic environments has not been addressed systematically. Here, we surveyed Methanomassiliicoccales presence in wetland soils, a globally important source of methane emissions to the atmosphere, and in the ... -
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 ... -
Restructuring of a zooplankton community by perturbation from a wind-forced coastal jet
(Journal article; Tidsskriftartikkel; Peer reviewed, 2010-09)The impact of transient wind events on an established zooplankton community was observed during a, field survey in a, coastal region off northern Norway in May 2002. A transient wind event induced a coastal jet/filament intrusion of warm, saline water into our survey area where a semi-permanent eddy was present. There was an abrupt change in zooplankton community structure within 4-7 days of the ... -
Tree thinking cannot taken for granted: challenges for teaching phylogenetics
(Journal article; Tidsskriftartikkel; Peer reviewed, 2008-02-05)Tree thinking is an integral part of modern evolutionary biology, and a necessary precondition for phylogenetics and comparative analyses. Tree thinking has during the 20th century largely replaced group thinking, developmental thinking and anthropocentricism in biology. Unfortunately, however, this does not imply that tree thinking can be taken for granted. The findings reported here indicate ... -
The role of a dominant predator in shaping biodiversity over space and time in a marine ecosystem
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-06-24)Exploitation of living marine resources has resulted in major changes to populations of targeted species and functional groups of large-bodied species in the ocean. However, the effects of overfishing and collapse of large top predators on the broad-scale biodiversity of oceanic ecosystems remain largely unexplored. Populations of the Atlantic cod (Gadus morhua) were overfished and several collapsed ... -
Takvatnprosjektet - Forskning og kultivering av en overbefolka røyeberstand
(Research report; Forskningsrapport, 2015)Overbefolka fiskebestander er et stort problem i mange av våre innsjøer. Det typiske kjennetegnet er en stor tetthet av gammel, småvokst og mager fisk, gjerne med en høy infeksjon av parasitter. Hardt uttynningsfiske har vært foreslått som et mulig botemiddel, men selv om det har vært gjort mange forsøk på å komme problemet til livs, er det få som har lyktes. Denne rapporten ... -
Effects of mortality changes on biomass and production in Calanus spp. populations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2011-04-28)Calanus species are the main link between primary producers and higher trophic-level organisms in the Barents Sea. The natural mortality rate is an essential parameter for determining the standing stock of Calanus, but it is also one of the most uncertain parameters in present knowledge. The level of human activity, and the associated risk of pollution, is increasing in the Barents Sea, and knowledge ... -
Marine migration and habitat use of anadromous brown trout Salmo trutta
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-05-22)The biology and ecology of anadromous brown trout Salmo trutta at sea is poorly understood. This study provided information on spatial and temporal distribution of sea trout in the ocean. The behaviour of 115 individuals (veteran migrants, 270-700 mm) was tracked by using acoustic telemetry in a fjord system during April-September in 2012-2013. Overall, fish spent 68% of their marine residence ... -
"Being the master in one’s own house:" Opinions and experiences with the Finnmark Estate
(Conference object; Konferansebidrag, 2015-08-26)In northernmost Norway the right to own and manage the land in Finnmark, was transferred from the state to the the Finnmark Estate (FeFo) in 2005. The land tenure arrangement was a result of land claims made by the indigenous Sami people of Norway. The resources and the land that was previously managed to the best for all Norwegian citizens by the state, is now managed to the best for the ... -
Habitat selection by a marine copepod during the productive season in the Subarctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2010-10-14)Few studies have analysed the depth distribution of marine zooplankton at high-resolution, and knowledge obtained from theoretical modelling studies predominates over that from empirical field studies. We analysed depth selection by the marine copepod Calanus finmarchicus during spring and summer in neritic and oceanic Subarctic regions. Data on hydrography and zooplankton distribution in the upper ... -
Identification and Evaluation of 21 Novel Microsatellite Markers from the Autumnal Moth (Epirrita autumnata) (Lepidoptera: Geometridae)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09-17)The autumnal moth (Epirrita autumnata) is a cyclically outbreaking forest Lepidoptera with circumpolar distribution and substantial impact on Northern ecosystems. We have isolated 21 microsatellites from the species to facilitate population genetic studies of population cycles, outbreaks, and crashes. First, PCR primers and PCR conditions were developed to amplify 19 trinucleotide loci and two ... -
No evidence for leaf-trait dissimilarity effects on litter decomposition, fungal decomposers, and nutrient dynamics
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-02)Biodiversity and ecosystem-functioning theory suggest that litter mixtures composed of dissimilar leaf species can enhance decomposition due to species trait complementarity. Here we created a continuous gradient of litter chemistry trait variability within species mixtures to assess effects of litter dissimilarity on three related processes in a natural stream: litter decomposition, fungal biomass ... -
Status for småblankbestanden i Namsen
(Research report; Forskningsrapport, 2009-01)Småblanken, som finnes kun i Namsenvassdraget, er den eneste bestanden av ferskvannsstasjonær laks i Europa som lever hele livet i elva og ikke har vandringer til innsjøer. Her utredes status for bestanden basert på 1) oppsummering kjent kunnskap, 2) materiale samlet inn ved overvåking i 2007-2008 (el-fiske på 17 stasjoner og garnfiske på 13 stasjoner), 3) noe tilleggs-materiale samlet inn i ...