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Article
Trond Oigarden, Auteur ; Thomas Borge, Auteur ; Jan T. Lifjeld, AuteurPasserine bird species vary considerably in the frequency of extrapair paternity, but the factors causing this variation are not well understood. There is some comparative evidence that extrapair paternity is associated with the population level[...]
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
Primary sex ratios vary with clutch size in the size-dimorphic White-throated Dipper Cinclus cinclus
Trond Oigarden, Auteur ; Jan T. Lifjeld, AuteurSex allocation theory explains how parents should allocate reproductive effort to the rearing of sons and daughters. A central premise is that there is room for individual optimization of brood sex ratios as a function of the relative rearing co[...]
