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Article
Anton Antonov, Auteur ; Bard G. Stokke, Auteur ; Peter S. Ranke, Auteur ; Frode Fossoy, Auteur ; Arne Moksnes, Auteur ; Eivin Roskaft, AuteurThere is at present considerable variation in the level of antiparasite defences among different host species of avian brood parasites, but in many potential hosts some individuals reject poorly matching parasite eggs. Here we present unique abs[...]
Article
Terje Laskemoen, Auteur ; Frode Fossoy, Auteur ; Geir Rudolfsen, Auteur ; Jan T. Lifjeld, AuteurIn passerine species with frequent extrapair mating, young (second calendar year) males often have a lower fertilization success than older (after second calendar year) males. This pattern might be explained by male- or female-driven mechanisms,[...]
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
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
Petr Procházka, Auteur ; Bard G. Stokke, Auteur ; Henrik Jensen, Auteur ; Drahomira Fainova, Auteur ; Erica Bellinvia, Auteur ; Frode Fossoy, Auteur ; Johan R. Vikan, Auteur ; Josef Bryja, Auteur ; Manuel Soler, AuteurMigratory birds generally have higher dispersal propensity than resident species and are thus expected to show less genetic differentiation. On the other hand, specific migration patterns may promote genetic structure, such as in situations wher[...]
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[...]
