Age-dependent trajectories differ between within-pair and extra-pair paternity success

Y. H. Hsu, M. J.P. Simons, J. Schroeder, A. Girndt, I. S. Winney, T. Burke, S. Nakagawa

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7 引文 斯高帕斯(Scopus)

摘要

Reproductive success is associated with age in many taxa, increasing in early life followed by reproductive senescence. In socially monogamous but genetically polygamous species, this generates the interesting possibility of differential trajectories of within-pair and extra-pair siring success with age in males. We investigate these relationships simultaneously using within-individual analyses with 13 years of data from an insular house sparrow (Passer domesticus) population. As expected, we found that both within- and extra-pair paternity success increased with age, followed by a senescence-like decline. However, the age trajectories of within- and extra-pair paternity successes differed significantly, with the extra-pair paternity success increasing faster, although not significantly, in early life, and showing a delayed decline by 1.5 years on average later in life compared to within-pair paternity success. These different trajectories indicate that the two alternative mating tactics should have age-dependent pay-offs. Males may partition their reproductive effort between within- and extra-pair matings depending on their current age to reap the maximal combined benefit from both strategies. The interplay between these mating strategies and age-specific mortality may explain the variation in rates of extra-pair paternity observed within and between species.

原文English
頁(從 - 到)951-959
頁數9
期刊Journal of Evolutionary Biology
30
發行號5
DOIs
出版狀態Published - 2017 五月

All Science Journal Classification (ASJC) codes

  • 生態學、進化論、行為學與系統學

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