English
norskBlar i utgivelsesdato Artikler, rapporter og annet (arktisk og marin biologi)
Viser treff 21-40 av 1513
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Pelagic eutrophication in the Gulf of Riga
(Chapter; Bokkapittel, 2005-01-06)Quantitative estimates of the fluxes and dynamics in the nutrient load on marine environments, their distribution and channelling through the food web and the effect on the increase of new production, are fundamental and constitute a prerequisite for the planning of actions for water protection measures. The Gulf of Riga is no exception. The Gulf is a semi-enclosed part of the eastern Baltic ... -
Cultural eutrophication: perspectives and prospects
(Chapter; Bokkapittel, 2005-01-06)History of cultural eutrophication. Cultural eutrophication is old as Homo sapiens. In particular after the introduction of agriculture and larger settlements eutrophication has been mans faithful companion. During the pre-agricultural hunting and picking stage only probably a couple million humans inhabited the world and cultural eutrophication was negligible. The 3 orders of magnitude ... -
Drainage basin nutrient inputs and eutrophication: an integrated approach
(Book; Bok, 2005-01-06)Eutrophication is an increase in primary production due to increased nutrient supply and its consequences. In its widest sense eutrophication means any increase of nutrient availability that increases primary production. Frequently, however, eutrophication is understood exclusively as the consequence of nutrient input by anthropogenic activities. The primary consequence of eutrophication in aquatic ... -
Røye som langtidsvert og smittereservoar for Gyrodactylus salaris i Skibotnelva i Troms
(Research report; Forskningsrapport, 2005-03)Skibotnelva i Troms var lenge det eneste vassdraget i våre to nordligste fylker med infeksjon av fiskeparasitten Gyrodactylus salaris. Parasitten ble første gang påvist i 1979, og to rotenonbehandlinger i den lakseførende delen (i 1988 og 1995) har vært mislykkede. Di-rektoratet for naturforvaltning vurderer bygging av langtidssperre som et av flere aktuelle utryddingstiltak i Skibotnelva. Imidlertid ... -
Registreringer av lakselus på laks, sjøørret og sjørøye i 2004
(Research report; Forskningsrapport, 2005-06)Results from 2004 showed that the lice infection pressure varied between the different monitoring stations in time and space and that the overall pattern was moderate to high infection in all areas. This is in spite of the fact that the fish farmers have improved their implementation of delousing strategies in fish farms. The density of fish farms is high all along the coast. The total biomass may ... -
Tresatt impediment og livsløpstrær av osp på hogstflater. Effektive tiltak for artsmangfoldet i norsk skog?
(Research report; Forskningsrapport, 2005-07)Skogbruket legger ned betydelige ressurser i form av arbeid og kapital for å ta hensyn til biologisk mangfold. Det er av stor betydning for skogbrukets økonomi og konkurranseevne at disse ressursene benyttes slik at man får best mulig bevaring av biologisk mangfold per krone. Rapporten omhandler to ulike delprosjekter som har vært gjennomført i forbindelse med Forskningsrådets prosjekt ... -
Assessing dental wear in reindeer using geometric morphometrical methods.
(Journal article; Peer reviewed; Tidsskriftartikkel, 2006) -
Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2006)Theoretical models predict that subordinate males should have higher sperm velocity to compensate for their disadvantaged mating role and because they experience sperm competition more frequently than dominant males. Differences in mean velocity between sperm of dominants and subordinates in the predicted direction are also documented for a few species, including the Arctic char, Salvelinus alpinus ... -
Fjellrev i Finnmark : forskning og tiltak 2006
(Research report; Forskningsrapport, 2006) -
Konflikter mellom ærfugl og blåskjelldyrking
(Research report; Forskningsrapport, 2006-01)Oppdrett av blåskjell har i de senere år økt sterkt i omfang i Norge, men kunnskapen om de økologiske konsekvensene av virksomheten er meget begrenset. Et betydelig problem som har oppstått i denne forbindelse er predasjon fra fugl, og da særlig ærfugl. Dette har klare negative konsekvenser for lønnsomheten, samt representerer et kunstig habitat og mulige negative påvirkninger for fugl. Bedre ... -
Ørekyt i Namsenvassdraget. Utbredelse, spredningsrisiko og tiltak
(Research report; Forskningsrapport, 2006-04)Undersøkelser i Namsenvassdraget i 2005 viste at ørekyt forekommer i tette bestander i innsjøer og flyer øverst i vassdraget. I Otersjøen øverst i Sanddøla har ørekyt forekommet i solide bestander siden 1960-tallet. I Tunnsjøen og i Namsvatnet ble arten først registrert på 1990-tallet. Kartleggingen i 2005 viste at ørekyt hadde spredt seg fra Tunnsjøen til Tunnsjøflyan, men ikke videre ned ... -
Biologiske undersøkelser i Altaelva 2005
(Research report; Forskningsrapport, 2006-05)Altaelva er ei av Norges beste elver for sportsfiske etter laks. Elva har en storvokst laksestamme, og en unik kultur og historie knyttet til laksefisket. Stortinget vedtok å utbygge og regulere elva for kraftproduksjon i 1978. Byggingen av kraftverksdammen ble igangsatt i 1983, og Alta kraftverk ble satt i drift i 1987. Det er gjennomført omfattende fiskebiologiske undersøkelser i vassdraget siden ... -
Distribution of overwintering Calanus in the North Norwegian Sea.
(Journal article; Peer reviewed; Tidsskriftartikkel, 2006-07-25)During winter 2003 and 2004, zooplankton and hydrographic data were collected in the northern parts of the Norwegian Sea (68–72º N, 8–17º E) west of the Norwegian shelf break at depths down to 1800 m. The results cover both inter and intra annual changes of hydrography and distribution of Calanus spp. For the whole survey area, average seawater temperature down to 1000mwas higher in 2004 than ... -
Movements of female lumpsucker Cyclopterus lumpus in a Norwegian fjord during the spawning period
(Research report; Forskningsrapport, 2007)Lumpsucker are distributed throughout the North Atlantic Ocean, and migrate considerable distances between offshore feeding areas and shallow inshore spawning areas. In July 2006, a study on the movements of female lumpsucker during the spawning period was carried out in Øksfjord, Northern Norway. Twenty fish (mean body mass 3.2 kg, range 1.5- 4.8 kg) were tagged with acoustic transmitters and ... -
Genetic investigation of swimbladder inflation anomalies in the European sea bass, Dicentrarchus labrax L.
(Journal article; Tidsskriftartikkel; Peer reviewed, 2007)Although the aetiology of swimbladder inflation anomalies in important aquaculture species such as European sea bass D. labrax is not fully determined, culture conditions are commonly suggested as main contributory factors. Little information is available on whether swimbladder inflation has a genetic basis for its expression too. In this work, 24 full-sibling sea bass families from a 4 dams x 6 ... -
Prosjekt ”Fjellrev i Finnmark” : rapport for perioden 2004-2007
(Research report; Forskningsrapport, 2007) -
Fish populations, gill net catches and gill net selectivity in the Lower Orange River, Namibia, from 1995 to 2001
(Research report; Forskningsrapport, 2007-01)The Orange River: The lower part of the Orange River forms the border between Namibia and South Africa from the mouth of the river and 580 km upstream. The river origins in the Lesotho Highlands, and runs for approximately 2300 km from the source to the Orange River Mouth at Oranjemund (Namibia) and Alexander Bay (South Africa), where it discharges into the Atlantic Ocean. The total Orange ... -
A mitogenomic approach to the taxonomy of pollocks. Theragra chalcogramma and T. finnmarchica represent one single species
(Journal article; Tidsskriftartikkel; Peer reviewed, 2007-06-07)Background: The walleye pollock (Theragra chalcogramma) and Norwegian pollock (T. finnmarchica) are confined to the North Pacific and North Atlantic Oceans, respectively, and considered as distinct species within the family Gadidae. We have determined the complete mtDNA nucleotide sequence of two specimens of Norwegian pollock and compared the sequences to that of 10 specimens of walleye pollock ... -
Rabies hos flaggermus. En oversiktsrapport. Revidert utgave av NINA Rapport 76
(Research report; Forskningsrapport, 2007-07)Rabies hos flaggermus er utbredt over store deler av verden og er også registrert i mange områder i Europa. Fjorten av Europas rundt 40 arter er rapportert å ha vært eksponert for rabiesvirus enten ved påvisning av viruset eller ved funn av antistoffer i blod. Rabiesvirus som forekommer hos flaggermus i Europa kalles European Bat Lyssavirus (EBLV) og finnes i to varianter, EBLV1 og EBLV2 (også kalt ... -
Complete DNA sequences of the plastid genomes of two parasitic flowering plant species, Cuscuta reflexa and Cuscuta gronovii
(Journal article; Tidsskriftartikkel; Peer reviewed, 2007-08-22)Background: The holoparasitic plant genus Cuscuta comprises species with photosynthetic capacity and functional chloroplasts as well as achlorophyllous and intermediate forms with restricted photosynthetic activity and degenerated chloroplasts. Previous data indicated significant differences with respect to the plastid genome coding capacity in different Cuscuta species that could correlate with ...
