ArticleBMC ecology and evolution2025
Timing of mortality during development alters the evolution of aging.
Article in BMC ecology and evolution, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundFor most animals, intrinsic senescence-induced mortality increases with age, while deaths from extrinsic threats, such as predation or accidents, decline during development as individuals grow and mature. Age-dependent modulation of extrinsic mortality is known to influence the evolution of aging. Yet, how the precise timing of changes in mortality shapes evolutionary forces, i.e., when they enhance and when they slow-down aging, remains poorly understood.
resultsTo address this, we developed two complementary mathematical models that integrate survival benefits arising during development with the progressive increase in mortality associated with senescence. Agent-based simulations and deterministic analyses revealed a strong and consistent influence of the timing of developmental survival benefits on their evolutionary impact: early-life survival benefits accelerate the rate of ageing, while late-acting benefits slow it down. This difference arises because early-life benefits more strongly enhance individual reproductive success. Early-life benefits thereby increase the overall growth potential of the population more strongly than late-life benefits, thereby diminishing the relative evolutionary advantage of increased longevity.
conclusionsOur results underscore the importance of mortality timing in the evolution of aging and provide a theoretical framework for connecting developmental trajectories to aging dynamics.
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