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Male mammals typically have shorter lifespans than females [1]. Sex differences in survival may result, in part, from sex-specific optima in investment in reproduction, with higher male mortality rates from sexual competition selecting for a “live-fast die-young” strategy in this sex [2]. In the wild, lifespan is also influenced by environmental conditions experienced early in life. Poor conditions...
Theories that explain the persistence of ageing in the face of natural selection implicitly assume that there is a genetic basis for ageing. This has now for the first time been shown to be the case in two free-living populations of mammals.
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