Senescence: why and where selection gradients might not decline with age

Proceedings of the Royal Society B: Biological Sciences - Tập 288 Số 1955 - Trang 20210851 - 2021
Mark Roper1, Pol Capdevila1,2, Roberto Salguero‐Gómez3,1,4
1Department of Zoology, University of Oxford, 11a Mansfield Road, Oxford OX1 3SZ, UK
2School of Biological Sciences, University of Bristol, 24 Tyndall Avenue, Bristol BS8 1TQ, UK
3Centre for Biodiversity and Conservation Science, University of Queensland, St Lucia, Queensland 4071, Australia
4Evolutionary Demography Laboratory, Max Plank Institute for Demographic Research, Rostock 18057, Germany

Tóm tắt

Patterns of ageing across the tree of life are much more diverse than previously thought. Yet, we still do not adequately understand how, why and where across the tree of life a particular pattern of ageing will evolve. An ability to predict ageing patterns requires a firmer understanding of how and why different ecological and evolutionary factors alter the sensitivity of fitness to age-related changes in mortality and reproduction. From this understanding, we can ask why and where selection gradients might not decline with age. Here, we begin by summarizing the recent breadth of literature that is unearthing, empirically and theoretically, the mechanisms that drive variation in patters of senescence. We focus on the relevance of two key parameters, population structure and reproductive value, as key to understanding selection gradients, and therefore senescence. We discuss how growth form, individual trade-offs, stage structure and social interactions may all facilitate differing distributions of these two key parameters than those predicted by classical theory. We argue that these four key aspects can help us understand why patterns of negligible and negative senescence can actually be explained under the same evolutionary framework as classical senescence.

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Roper M, Capdevila P, Salguero-Gómez R. 2021 Senescence: why and where selection gradients might not decline with age. Fighsare.

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Proceedings of the Royal Society B: Biological Sciences

Tập 288 Số 1955

20210851

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