English
norskBlar i forfatter "Kleven, Oddmund"
Viser treff 1-6 av 6
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Extra-pair paternity in the boreal, socially monogamous Grey-headed Chickadee (Poecile cinctus)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019)Extra-pair mating is a common alternative reproductive strategy among socially monogamous bird species, but empirical data on the genetic mating systems of most species are still lacking. Here we present the first parentage study in the Grey-headed Chickadee (<i>Poecile cinctus</i>), a socially monogamous passerine breeding at low densities in the boreal region of the Palaearctic and Nearctic. In a ... -
Extra-pair paternity in the boreal, socially monogamous Grey-headed Chickadee (Poecile cinctus)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019)Extra-pairmatingisacommonalternativereproductivestrategyamongsociallymonogamous bird species, but empirical data on the genetic mating systems of most species are still lacking. Here we present the first parentage study in the Grey-headed Chickadee (Poecile cinctus), a socially monogamous passerine breeding at low densities in the borealregionofthePalaearcticandNearctic.Inapopulationinnortheastern ... -
Kongeørn i Finnmark. Årsrapport 2012
(Research report; Forskningsrapport, 2013)Målet med prosjektet er å framskaffe økt kunnskap om bestanden av kongeørn i Finnmark. Gjennom å studere atferd, valg av byttedyr, reproduksjon og trekkmønster er kunnskapen nå betydelig forbedret. Kongeørna er studert over tolv feltsesonger (2001-2012) i de indre områdene av Porsanger, Karasjok og Tana. Det er også gjennomført studier i Alta og Kautokeino av rovfuglgruppa i Alta. I perioden ... -
Resident bird species track inter-annual variation in spring phenology better than long-distance migrants in a subalpine habitat
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-11)The ability to track variation in climate is important for species to persist in a given environment. Lack of responses to both long-term changes and inter-annual variation in climate parameters can result in reduced fitness and population decline. Furthermore, migration strategy can influence the ability to track climatic variation due to the potential to use reliable environmental cues. Here, ... -
Sperm velocity in a promiscuous bird across experimental media of different viscosities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-15)In species with internal fertilization, the female genital tract appears challenging to sperm, possibly resulting from selection on for example ovarian fluid to control sperm behaviour and, ultimately, fertilization. Few studies, however, have examined the effects of swimming media viscosities on sperm performance. We quantified effects of media viscosities on sperm velocity in promiscuous willow ... -
When Older Males Sire More Ofspring—Increased Attractiveness or Higher Fertility?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-23)In birds with extrapair mating, older males usually have higher fertilization success than younger males. Two hypotheses can potentially explain this pattern: 1) females prefer older, and often more ornamented males, or 2) older males invest more in reproduction and fertility than younger males. Here we studied factors associated with age-related male fertilization success in a population of barn ...
