Diverse aging rates in ectothermic tetrapods provide insights for the evolution of aging and longevity

Document Type

Article

Publication Date

6-24-2022

Abstract

Comparative studies of mortality in the wild are necessary to understand the evolution of aging; yet, ectothermic tetrapods are underrepresented in this comparative landscape, despite their suitability for testing evolutionary hypotheses. We present a study of aging rates and longevity across wild tetrapod ectotherms, using data from 107 populations (77 species) of nonavian reptiles and amphibians. We test hypotheses of how thermoregulatory mode, environmental temperature, protective phenotypes, and pace of life history contribute to demographic aging. Controlling for phylogeny and body size, ectotherms display a higher diversity of aging rates compared with endotherms and include phylogenetically widespread evidence of negligible aging. Protective phenotypes and life-history strategies further explain macroevolutionary patterns of aging. Analyzing ectothermic tetrapods in a comparative context enhances our understanding of the evolution of aging.

Version

The Version of Record (VoR) of this Author Manuscript has been published and can be accessed using the DOI below.

DOI

doi:10.1126/science.abm0151

Publication Title

Science

Volume Number

376

Issue Number

6600

First Page

1459

ISSN

0036-8075

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