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Article
Oddmund Kleven, Auteur ; Aksel N. Fiske, Auteur ; Magnus Håvik, Auteur ; Rolf T. Kroglund, Auteur ; Jan E. Østnes, Auteur ; Tim Schmoll, AuteurBasic knowledge about the genetic mating system is lacking for the great majority of the approximately 10,000 extant bird species. Filling this knowledge gap is not only critical for a comprehensive understanding of the reproductive ecology of e[...]
Article
Adriaan De Jong, Auteur ; Oddmund Kleven, Auteur ; Jan Eivind Østnes, Auteur ; Rolf Terje Kroglund, Auteur ; Isak Vahlström, Auteur ; Jan Nilsson, Auteur ; Göran Spong, AuteurDuring their flightless summer moult, Taiga Bean Geese Anser fabalis fabalis gather at communal moulting sites. Individuals from the Nord-Trøndelag breeding area in Norway have been observed to join with local individuals on moulting sites in Vi[...]
Article
Jan Ove Gjershaug, Auteur ; Henrik Brøseth, Auteur ; Oddmund Kleven, Auteur ; John Atle Kålås, Auteur ; Jenny Mattisson, Auteur ; Mari Tovmo, AuteurCapsule: A description of the methods used for monitoring the Golden Eagle Aquila chrysaetos in NorwayAims: To provide a comprehensive description of monitoring methods.Methods: The intensive monitoring of the Golden Eagle in Norway started in 1[...]
Article
Vidar Selås, Auteur ; Oddmund Kleven, Auteur ; Odd Frydenlund Steen, AuteurThe turnover rate of breeding Northern Goshawk Accipiter gentilis females in two study areas in southern Norway, which are assumed to experience different levels of illegal human persecution, was estimated using DNA extracted from moulted feathe[...]
Article
Tim Schmoll, Auteur ; Oddmund Kleven, AuteurInformation about male infertility in free-living bird populations and its underlying causes are poorly documented in the literature. Here, we assessed sperm quality and infertility among males in a wild population of Blue Tits Cyanistes caerule[...]
Article
Oddmund Kleven, Auteur ; Geir Rudolfsen, Auteur ; Tim Schmoll, AuteurExtra-pairmating 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-head[...]
Article
Extra-pair paternity and sperm length variation in a far northern Great Tit (Parus major) population
Oddmund Kleven, Auteur ; Jan Eivind Østnes, Auteur ; Geir Rudolfsen, Auteur ; Sonja Schindler, Auteur ; Tim Schmoll, AuteurExtra-pair paternity is common among socially monogamous bird species and considered an important driver of post-copulatory sexual selection on ejaculate traits including sperm traits. Patterns of extra-pair paternity and sperm size both show su[...]
Article
Eduardo Garcia-Del-Rey, Auteur ; Oddmund Kleven, Auteur ; Jan T. Lifjeld, AuteurBirds breeding on islands often exhibit lower rates of extrapair paternity than their mainland counterparts, perhaps explained by low genetic variation, slower life histories and reduced sexual selection in island populations. Extrapair paternit[...]
Article
Jan T. Lifjeld, Auteur ; Terje Laskemoen, Auteur ; Frode Fossoy, Auteur ; Arild Johnsen, Auteur ; Oddmund Kleven, AuteurInformation about male infertility in free-living birds is scarce, but anecdotal and circumstantial evidence suggests that it does occur regularly at a low frequency. In this paper we document three cases of azoospermia in two passerine species,[...]
Article
Oddmund Kleven, Auteur ; Bjorn-Aksel Bjerke, Auteur ; Jan T. Lifjeld, AuteurExtrapair paternity seems to be common in socially monogamous passerines, but the genetic mating system of most species is currently unknown. Here, we report the first study of paternity in the socially monogamous Common Crossbill (Loxia curviro[...]
Article
Arne Moksnes, Auteur ; Eivin Roskaft, Auteur ; Geir Rudolfsen, Auteur ; Sigrun Skjelseth, Auteur ; Bard G. Stokke, Auteur ; Oddmund Kleven, Auteur ; H. Lisle Gibbs, Auteur ; Marcel Honza, Auteur ; Barbara Taborsky, Auteur ; Yvonne Teuschl, Auteur ; Wolfgang Vogl, Auteur ; Michael Taborsky, AuteurFemales of the obligate brood parasitic common cuckoo Cuculus canorus are assumed to lay eggs of consistent colour and pattern and egg characteristics have been used to separate between different individuals. We tested the "constant egg-type hyp[...]
Article
Terje Laskemoen, Auteur ; Oddmund Kleven, Auteur ; Frode Fossoy, Auteur ; Jan T. Lifjeld, AuteurSperm cells are highly diversified in birds and considerable research effort has focused on variation in sperm morphology between species. However, surprisingly little is known about intraspecific variation in sperm morphology in birds. We analy[...]
Article
Oddmund Kleven, Auteur ; Trond Oigarden, Auteur ; Bjorn E. Foyn, Auteur ; Arne Moksnes, Auteur ; Eivin Roskaft, Auteur ; Geir Rudolfsen, Auteur ; Bard G. Stokke, Auteur ; Jan T. Lifjeld, AuteurSocial monogamy is common among passerines whereas genetic monogamy is regarded as rare. Here we report the first study of paternity in the genus Phoenicurus (Aves, Muscicapidae). In the socially monogamous common redstart (Phoenicurus phoenicur[...]
Article
Tycho Anker-Nilssen, Auteur ; Oddmund Kleven, Auteur ; Tomas Aarvak, Auteur ; Jan T. Lifjeld, AuteurWe investigated extra-pair paternity (EPP) among 46 young in 32 broods of 19 social pairs of Black Guillemot Cepphus grylle, using a combination of three polymorphic microsatellite markers. The analysis was based on blood samples collected over [...]
Article
Oddmund Kleven, Auteur ; Gunnhild Marthinsen, Auteur ; Jan T. Lifjeld, AuteurGenetic studies have shown that extra-pair paternity is widespread among socially monogamous bird species. Yet, the role of males and females and their behavior leading to this mixed reproductive strategy is poorly understood. Here, we analyze p[...]
Article
Jan E. Ostnes, Auteur ; Rolf T. Kroglund, Auteur ; Oddmund Kleven, Auteur ; Torgeir Nygard, AuteurMigratory behaviour is subject to intraspecific variation and may be determined by the age, sex and population origin of individuals. Here we equipped eight juvenile Ospreys (Pandion haliaetus) with GPS-based satellite-transmitters to investigat[...]
Article
Tycho Anker-Nilssen, Auteur ; Oddmund Kleven, Auteur ; Tomas Aarvak, Auteur ; Jan T. Lifjeld, Auteur
Article
Terje Laskemoen, Auteur ; Oddmund Kleven, Auteur ; Lars Erik Johannessen, Auteur ; Frode Fossoy, Auteur ; Raleigh J. Robertson, Auteur ; Jan T. Lifjeld, AuteurSperm morphometry and motility are important male traits affecting fertility and post-copulatory competitive ability. However, studies examining consistency in sperm traits over time for individual males are rather scarce, particularly in free-l[...]
Article
Tim Schmoll, Auteur ; Oddmund Kleven, AuteurThe evolutionary forces that shape and maintain variation in sperm traits across species in birds have recently attracted increased attention. Much less is known about the patterns, the causes and the consequences of variation in sperm traits wi[...]
Article
Oddmund Kleven, Auteur ; Terje Laskemoen, Auteur ; Jan T. Lifjeld, AuteurHow long is a sand martin Riparia riparia spermatozoon? In a recent study, Helfenstein et al. (2008) presented data on the intraspecific variation in sperm length, swimming speed and longevity in this species and some interesting correlations be[...]
Article
Emily R. A. Cramer, Auteur ; Terje Laskemoen, Auteur ; Oddmund Kleven, Auteur ; Jan T. Lifjeld, AuteurIt is well documented that sperm size and structure varies considerably among avian species, but we know much less about the extent of intraspecific variation in sperm morphometry and its possible co-variation with somatic traits like body size [...]
Article
Hanna N. Stostad, Auteur ; Silje L. Rekdal, Auteur ; Oddmund Kleven, Auteur ; Terje Laskemoen, Auteur ; Gunnhild Marthinsen, Auteur ; Arild Johnsen, Auteur ; Jan T. Lifjeld, AuteurSperm morphology is highly diversified among species and at higher taxonomic levels. In birds, there is also increasing evidence of geographical differentiation in sperm traits within species, especially in those with strong sperm competition. G[...]
