Fuglesang er gjentatte ganger blitt vist å være et seksuelt selektert trekk som kan reflektere aspekter av hannlig kvalitet. Lærte sangtrekk, som for eksempel repertoarstørrelse, er foreslått å ha kostnader knyttet til ...

Aposematism is a defence system used by toxic animals where the animals use warning colouration, often combined with warning gestures, to fend off predators. The most probable scenario is that the toxicity was developed ...

Fuglesang blir generelt betraktet som et seksuelt selektert trekk, og hos mange sangfuglarter er hunner vist å foretrekke hanner med høy sangytelse eller kompleks sangstruktur. Utviklingsstresshypotesen foreslår at lærte ...

A total of 20 water traps were set out at four locations around Longyearbyen on the High Arctic island Spitsbergen. The traps sampled aerially dispersed invertebrates during the summer of 2008. These trapping locations ...

Variation in behavioral traits may be genetically or environmentally determined, or both. Previous studies on nest building behaviour in captive birds have proposed that nest building is mainly genetically determined. ...

An upper Ordovician (upper Sandbian) benthic Paleozoic fauna at Langesund in the Oslo graben area has been reviewed. The study area consisted of the uppermost 13 meters of sediments in the Fossum Formation. A species/plot ...

Separate gytedemer av harr har etablert seg over 20-25 generasjoner i Lesjaskogsvatn, Oppland fylke. Gytebekkene har konsistent ulike temperaturregimer. Nylige undersøkelser indikerer motgradient veksttilpasning i tidlige ...

The coastal cod is an important commercial and recreational resource for the local communities in the Skagerrak. The situation of this and neighbouring stocks has worsened for decades, promoting an imperative need for ...

Breeding habitat-choice in two closely related species of passerines, Great Tit (Parus major) and Blue Tit (Cyanistes caereleus) was studied to reveal if their habitat preferences primarily is a hereditary trait, or if ...

In my experiment I studied domestic chicks (Gallus gallus domesticus) to find out how different sounds and colours affect their behaviour in a feeding process. Previous studies have found the wasp’s buzzing to be a negatively ...

1. Many studies have dealt with home range and migratory patterns of Cervid species, but there are few explicit analyses quantifying migratory patterns and home range size as a result of habitat. Red deer is known to perform ...

Abstract A lot of studies have been performed on demographic changes in ungulate population due to density dependence, but little is done on density dependent changes in foraging behaviour which can be a mechanism of such ...

The aim of this study was to investigate to what extent population density and small scale habitat variability affect somatic growth of resident, stream-living brown trout Salmo trutta. There is an ongoing debate whether ...

Abstract The heterospecific attraction hypothesis suggests that migrants cue on residents with similar ecological needs to find suitable breeding sites, and that they have reproductive fitness benefits from doing so. In ...

It is stated that the feral American mink (Mustela vison), an introduced predator to Europe, have seriously affected local densities of birds breeding in coastal areas. I studied the effect of mink removal on breeding ...

Population sizes of large carnivores have increased in Scandinavia during the last century. Increases in predator population sizes can affect prey populations not only through increased mortality, but also through behavioural ...