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Dryad

Longer telomeres during early life predict higher lifetime fitness in females but not males

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May 13, 2021 version files 1.16 MB

Abstract

The mechanisms that contribute to variation in lifetime reproductive success are not well understood. One possibility is that telomeres, conserved DNA sequences at chromosome ends that often shorten with age and stress exposures, may reflect differences in vital processes or themselves influence fitness. Telomere length often predicts longevity, but longevity is only one component of fitness and little is known about how longevity and lifetime reproductive success relate to telomere dynamics in wild populations. We examined the relationships between telomere length beginning in early life, telomere loss into adulthood, and lifetime reproductive success in free-living house sparrows (Passer domesticus). We found that females, but not males, with longer telomeres during early life had higher lifetime reproductive success, due to associations with longevity and not reproduction per year or attempt. Telomeres decreased with age in both sexes, but telomere loss was not associated with lifetime fitness. Sparrow telomeres may reflect differences in quality or condition rather than in pace of life, but only in females. Sexually discordant selection on telomeres is expected to influence the stability and maintenance of within population variation in telomere dynamics and suggests that any role telomeres play in mediating life-history trade-offs may be sex specific.