Evolution of male age-specific reproduction under differential risks and causes of death: males pay the cost of high female fitness

Journal of Evolutionary Biology
H-Y ChenAlexei A Maklakov

Abstract

Classic theories of ageing evolution predict that increased extrinsic mortality due to an environmental hazard selects for increased early reproduction, rapid ageing and short intrinsic lifespan. Conversely, emerging theory maintains that when ageing increases susceptibility to an environmental hazard, increased mortality due to this hazard can select against ageing in physiological condition and prolong intrinsic lifespan. However, evolution of slow ageing under high-condition-dependent mortality is expected to result from reallocation of resources to different traits and such reallocation may be hampered by sex-specific trade-offs. Because same life-history trait values often have different fitness consequences in males and females, sexually antagonistic selection can preserve genetic variance for lifespan and ageing. We previously showed that increased condition-dependent mortality caused by heat shock leads to evolution of long-life, decelerated late-life mortality in both sexes and increased female fecundity in the nematode, Caenorhabditis remanei. Here, we used these cryopreserved lines to show that males evolving under heat shock suffered from reduced early-life and net reproduction, while mortality rate had no effect. O...Continue Reading

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Citations

Dec 23, 2016·Annals of the New York Academy of Sciences·Robert C Brooks, Michael G Garratt
Aug 27, 2019·Ageing Research Reviews·Adiv A JohnsonBoris Shoshitaishvili

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