Male age alone predicts paternity success under sperm competition when effects of age and past mating effort are experimentally separated.

ABSTRACT: Older males often perform poorly under post-copulatory sexual selection. It is unclear, however, whether reproductive senescence is because of male age itself or the accumulated costs of the higher lifetime mating effort that is usually associated with male age. To date, very few studies have accounted for mating history and sperm storage when testing the effect of male age on sperm traits, and none test how age and past mating history influence paternity success under sperm competition. Here, we experimentally manipulate male mating history to tease apart its effects from that of age on ejaculate traits and paternity in the mosquitofish, Gambusia holbrooki. We found that old, naive males had more sperm than old, experienced males, while the reverse was true for young males. By cont

SUBMITTER: Aich U 

PROVIDER: S-EPMC8316792 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature