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Dryad

Parental age effects on offspring fitness in a wild population of a short-lived reptile

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Oct 07, 2025 version files 946.39 KB
Oct 15, 2025 version files 12.51 MB

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Abstract

As organisms age, the fitness of the offspring they produce can decline, which is often attributed to parental senescence. However, few studies have tested for effects of parental age on offspring fitness in wild populations or in short-lived vertebrates, and only recently have studies begun to examine such effects in male and female offspring independently. Here, we use five generations of mark-recapture and genetic parentage data from an island population of a short-lived lizard, the brown anole (Anolis sagrei), to test for effects of maternal and paternal age on the survival to adulthood, first-year reproductive success, longevity, and lifetime fitness of their offspring. We tested for effects of maternal and paternal age on components of offspring fitness using two methods: 1) “within-year” analyses of parents of different ages within the same annual reproductive season, and 2) “within-parent” repeated-measures analyses of the same parents at different ages across successive reproductive seasons. Our study adds to the growing literature suggesting that negative effects of parental age on offspring fitness may not be as prevalent as once thought, particularly in wild populations.