Data from: Male reproductive senescence in mammals is pervasive and aligned with the slow-fast continuum

Reproductive senescence, the decline in reproductive performance with
increasing age, has been well documented in mammalian females. Male
reproductive senescence, on the other hand, is much less understood,
partly due to the past complexities of getting reliable paternity
assignment in the wild. Through a standardized literature search, we
compiled age-specific reproductive data on both mating and reproductive
success on 57 species encompassing 73 populations. We then explored the
occurrence of male reproductive senescence and sought to identify key
ecological and evolutionary drivers modulating its intensity. We found
evidence of reproductive senescence in 60 % of the studied species, with a
detection probability increasing with larger sample sizes and longer
lifespan coverage (measured as the age range studied relative to
longevity). As expected, both the onset and the rate of male reproductive
senescence were aligned with the species position along the slow-fast
continuum, with fast-living species exhibiting earlier and stronger
reproductive senescence than slow-living species. Moreover, the rate of
reproductive senescence also increased with the level of sexual size
dimorphism, highlighting that males from species displaying a high level
of sexual selection suffer from a steeper rate of reproductive senescence.