Lumpsucker (Cyclopterus lumpus) is a demersal and shallow water spawning fish species with a relatively long egg incubation period. In case of acute oil pollution the embryos will be exposed to PAHs in the water for a relative long period. In this experiment we made a flow through rock column incubation system with oil contaminated gravel and exposed fertilized lumpsucker eggs to the water soluble ...

Formålet med denne oppgaven var å se på kvantitative endringer av makroalge- og lavsamfunnet i littoralsonen på fem lokaliteter i Troms, langs en eksponeringsgradient fra fjord til kyst. Ofte finner man samfunnsendringer innover i fjordene som er nært korrelert med forandringer i substratets stabilitet, tekstur og lokaltopografiske forhold i fjæra (helning) (pers. med. Tor Eiliv Lein). Artsdiversiteten ...

Anthropogenic and natural stressors can affect ecosystems negatively and it is therefore important to have a clear understanding of the responses of organisms to stressors. The Northern Goshawk (Accipiter gentilis) is a common raptor species of the boreal forest ecosystem and its location at the top of its food chain makes it a special target for two important stressors; endoparasitism and environmental ...

The female Common eider (Somateria mollossima) is a drab, lightly coloured bird, easily distinguished from the brightly ornamented male. Unlike the male, the female has white bands on the tips of her wings, and these white wing bands have been shown to reflect individual quality in previous studies. In this study the potential role of the white wing bands in parental care and mate choice is studied, ...

Marine copepods of the genus Pseudocalanus (Calanoida) are common in Svalbard waters as well as throughout the northern hemisphere. They contribute considerably to plankton biomass in addition to Calanus spp. and play an important role in the marine food web as a link between planktivores, such as fish larvae, and microalgae. Pseudocalanus consists of several sibling species, and two of them, ...

Most studies of nest site selection by northern goshawk, Accipiter gentilis, have been done in mixed – or coniferous forests, and emphasis has been put on the importance of large trees and relatively intact, old forest stands for nesting sites. However, goshawks in northern Norway are found in birch forests characterized by relatively small trees and a high natural level of fragmentation. In this ...

There is evidence of a negative population trend for the two neighbouring eider colonies of Håkøya and Grindøya in Troms county, northern Norway. Casual observations suggest that nest predation may be an important factor, and that the hooded crow in particular could be the main egg predator. On this basis, a two year pilot study was conducted to investigate the role of the hooded crow in the nest ...

A pilot project was carried out by the Institute of Marine Research (IMR) to test the functionality of GPS phone tags (by SMRU) on harbour seals (Phoca vitulina) in the Vesterålen archipelago, Norway. Acoustic surveys were performed to investigate the abundance of fish in these waters and scat sampling was used to assess the diet composition of the seal population inhabiting the area. Five juvenile ...

Rhizobiacea utgjør en bakterieslekt der de fleste medlemmene er i stand til å inngå symbioser med diverse legumer. Slekten innbefatter Rhizobium, Sinorhizobium, Mesorhizobium, Bradyrhizobium og Azorhizobium, og kollektivt omtales disse for rhizobia. Partnerskapet med legumer er av mutualistisk karakter, der mikrosymbionten bidrar med fiksert nitrogen i form av NH3, og planteverten sørger for en ...

To lokaliteter i Balsfjorden, Nord-Norge ble sammenlignet med hensyn på fangstmengde, populasjonsstruktur og morfologi til kongsnegl (Buccinum undatum). Til innsamling ble det benyttet walisiske snegleteiner som var egnet med fisk/sild og haneskjell i kombinasjon eller kun fisk/sild. Fangst foregikk månedlig fra mars til og med juni 2004, på 15, 30 og 45 m dyp. Fangsttiden var på 1 døgn. Antall og ...