No Evidence for Paternal Age Effects on Sons or Daughters When Accounting for Paternal Sperm Storage

This is the authors' abstract. We don't add key points for this paper.

to test the separate and interactive effects of paternal age and sexual rest on offspring fitness. As expected, old fathers produce fewer offspring than young fathers; however, paternal age does not influence the survival or age-dependent reproductive success of sons or daughters. Instead, a long duration of paternal sexual rest negatively impacts the reproductive success of the conceived sons. Furthermore, daughters of low reproductive quality selectively disappear with age, but sons do not, highlighting that demographic processes can further modulate paternal age effects. Overall, we highlight that paternal age effects might not be as pervasive as previously assumed and suggest that paternal sexual rest might be more important in influencing offspring phenotypes.