Blar i forfatter "Kortet, Raine"

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    • Genetic and potential non-genetic benefits increase offspring fitness of polyandrous females in non-resource based mating system 

      Kekäläinen, Jukka; Rudolfsen, Geir; Janhunen, Matti; Figenschou, Lars; Peuhkuri, Nina; Tamper, Nina; Kortet, Raine (Journal article; Tidsskriftartikkel; Peer reviewed, 2010)

    • Hatchery selection may depress the number of motile sperm but intensify selection for their swimming velocity in the Arctic charr 

      Kekäläinen, Jukka; Figenschou, Lars; Janhunen, Matti; Kortet, Raine; Peuhkuri, Nina; Rudolfsen, Geir (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      The ability of captive breeding programs to maintain genetic diversity and fitness has often been questioned. Recent studies suggest that fitness loss can be extremely rapid in various traits, but it is poorly known how captive breeding affects sperm quality and thus male fertility. We studied the potential effects of hatchery-induced selection on traits indicative of semen quality, in four generations ...

    • The relative effect of parasites and social status on sperm traits in Arctic charr 

      Figenschou, Lars; Folstad, Ivar; Rudolfsen, Geir; Hanssen, Sveinn Are; Kortet, Raine; Skau, Philip; Killie, Jan Eirik; Oskam, Irma Caroline; Strand, Harald (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Sperm production and sperm swimming speed, which most likely affect fertilization under sperm competition, are modified by proximate mechanisms. In a comprehensive observational study of free-living and reproductively active Arctic charr (Salvelinus alpinus), we examined the possible modulating effects of male social status (including ornamental development), parasite intensities, and immunity ...

    • Spawning coloration and sperm quality in a large lake population of Arctic charr (Salmonidae: Salvelinus alpinus L.) 

      Janhunen, Matti; Rudolfsen, Geir; Kekäläinen, Jukka; Figenschou, Lars; Peuhkuri, Nina; Kortet, Raine (Journal article; Tidsskriftartikkel; Peer reviewed, 2009)
      The modern theories of sexual selection predict that male sexual ornaments may have evolved as reliable signals of male fertilization efficiency. However, among the studies of fishes with external fertilization, the results have yielded ambiguous evidence. In the present study, we present data on the phenotypic relationships between red spawning coloration and ejaculate quality (spermatocrit, sperm ...