The first and second authors contributed equally to this work.
Late bloomers and baby boomers: ecological drivers of longevity in squamates and the tuatara
Version of Record online: 22 OCT 2014
© 2014 John Wiley & Sons Ltd
Global Ecology and Biogeography
Volume 24, Issue 4, pages 396–405, April 2015
How to Cite
Scharf, I., Feldman, A., Novosolov, M., Pincheira-Donoso, D., Das, I., Böhm, M., Uetz, P., Torres-Carvajal, O., Bauer, A., Roll, U. and Meiri, S. (2015), Late bloomers and baby boomers: ecological drivers of longevity in squamates and the tuatara. Global Ecology and Biogeography, 24: 396–405. doi: 10.1111/geb.12244
Editor: Gavin Thomas
- Issue online: 4 MAR 2015
- Version of Record online: 22 OCT 2014
- People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme. Grant Numbers: FP7/2007–2013, 333442
- Israel Science Foundation. Grant Number: 1005/12
- Body size;
- fast-slow continuum;
- phylogenetic comparisons;
Longevity is an important life-history trait, directly linked to the core attributes of fitness (reproduction and survival), yet large-scale comparative studies quantifying its implications for the ecology and life history of ectotherms are scarce. We tested the allometry of longevity in squamates and the tuatara, and determined how longevity is related to key environmental characteristics and life-history traits. Predictions based on life-history theory are expected to hold true for ectotherms, similarly to mammals and birds.
We assembled from the literature a dataset of the maximum longevities of more than a thousand squamate species, representing c. 10% of their known species diversity, their phylogenetic relationships and multiple life-history and ecological variables. Correcting for phylogeny, we modelled the link between squamate longevity and both key life-history traits, such as body mass and age at first reproduction, and important environmental factors, such as latitude and primary productivity within species distributional ranges.
Large-bodied species live for longer than small ones, but body size explains far less of the variance in longevity than it does in mammals and birds. Accounting for body size, squamate brood frequency is negatively correlated with longevity, while age at first reproduction is positively correlated with longevity. This points to a continuum of slow-to-fast life-history strategies. Squamates in high latitudes and cold regions live for longer, probably because a shorter season of activity translates to slower development, older age at first reproduction and hence to increased longevity. Individuals live longer in captivity than in the wild. Herbivorous and omnivorous squamates live for longer than carnivorous ones. We postulate that low-quality nutrition reduces growth rates, promotes a relative decline in reproductive rates and thus prolongs life.
Our results support key predictions from life-history theory and suggest that reproducing more slowly and at older ages, being herbivorous and, plausibly, lowering metabolism, result in increased longevity.