Blar i forfatter Artikler, rapporter og annet (Universitetsmuseet) "Jacobsen, Frode F."

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    • When Older Males Sire More Ofspring—Increased Attractiveness or Higher Fertility? 

      Lifjeld, Jan Terje; Kleven, Oddmund; Fossøy, Frode; Jacobsen, Frode F.; Laskemoen, Terje; Rudolfsen, Geir; Robertson, Raleigh J. (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 ...