Extrapair paternity and the opportunity for sexual selection in long-distant migratory passerines |
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Authors: | Albrecht Tomas; Schnitzer Jan; Kreisinger Jakub; Exnerova Alice; Bryja Josef; Munclinger Pavel |
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Institution: | a Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, CZ-675 02, Studenec 122, Czech Republic
b Department of Zoology, Faculty of Sciences, Charles University in Prague, CZ-128 44, Prague, Czech Republic
c Institute of Animal Physiology and Genetics, Academy of Sciences of the Czech Republic, Veve í 97, CZ-60200 Brno, Czech Republic |
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Abstract: | Extrapair fertilizations (EPFs) are frequently documented insongbirds; however, the extent to which this reproductive tacticcontributes to variance in male reproductive success and hencethe strength of sexual selection on males remains little studied.Using 2 approaches, intraspecific and comparative, we test thehypothesis that the contribution of EPFs to variance in malefitness increases with migration distance in north temperatesongbirds. Using data on the genetic mating system of the scarletrosefinch Carpodacus erythrinus, a long-distance migrant, weshow that the number of extrapair mates and within-pair paternityare the most important components of variance in male reproductivesuccess. There was no evidence of a trade-off between extrapairand within-pair success of individual males as males successfulin procuring EPFs were less likely to be cuckolded. Comparativedata reveal that the opportunity for sexual selection due toEPFs is positively associated with both migration distance andbreeding synchrony in north temperate passerines, and we discussseveral mechanisms that could extend these relationships. Ingeneral, these data suggest that EPFs have a potential to playan important role in the evolution of sexually selected traitsin long-distance migratory songbirds such as rosefinches. |
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Keywords: | comparative analysis mate choice parentage assignment promiscuity scarlet rosefinch Carpodacus erythrinus within-pair paternity |
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