Data from: Evidence that fertility trades off with early offspring fitness as males age

Sheri L. Johnson, Sylvia Zellhuber-McMillan, Joanne Gillum, Jessica Dunleavy, Jonathan P. Evans, Shinichi Nakagawa & Neil J. Gemmell
Models of aging predict that sperm function and fertility should decline with age as sperm are exposed to free radical damage and mutation accumulation. However, theory also suggests that mating with older males should be beneficial for females because survival to old age is a demonstration of a male’s high genetic and/or phenotypic quality. Consequently, declines in sperm fitness may be offset by indirect fitness benefits exhibited in offspring. While numerous studies have investigated age-based...
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