Getting old gracefully, and risk of dying before getting there: a new guide to theory on extrinsic mortality and senescence

نویسندگان

چکیده

Do environments or species traits that lower the mortality of individuals create selection for delaying senescence? Reading literature creates an impression mathematically oriented biologists cannot agree on validity George Williams' prediction (who claimed 'yes'). The abundance models and opinions may bewilder those are new to field. Here we provide heuristics as well simple outline when Williams holds, why there is a ‘null model’ where extrinsic does not change evolution senescence at all, it also possible expect opposite William’s prediction, increased favours slower senescence. We hope offer intuition by quantifying how much ‘placement’ offspring into population reduces its expected contribution gene pool future. Our first example shows sometimes has no effect (the null result), density dependence can that. Thereafter, model with ten different choices regulation high fast life histories (Williams) if increasing harms production juveniles their chances recruit population. If instead survival older in population, then slow (anti-Williams). discuss possibility empirically found Williams-like patterns indirect evidence operating via harming fitness prospects juveniles, opposed established breeders.

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This Center is co-directed by Howard Adelman and Linda Taylor and operates under the auspices of the School Mental Health Project, Dept. of Psychology, UCLA. Center for Mental Health in Schools, Box 951563, Los Angeles, CA 90095-1563 (310) 825-3634 Fax: (310) 206-5895; E-mail: [email protected] Website: http://smhp.psych.ucla.edu Permission to reproduce this document is granted. Please cite source ...

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ژورنال

عنوان ژورنال: Peer community in evolutionary biology

سال: 2023

ISSN: ['2551-668X']

DOI: https://doi.org/10.24072/pci.evolbiol.100626