Is group size related to longevity in mammals?

Life-history theory predicts that reduced extrinsic risk of mortality should increase species longevity over evolutionary time. Increasing group size should reduce an individual's risk of predation, and consequently reduce its extrinsic risk of mortality. Therefore, we should expect a relations...

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Veröffentlicht in:Biology letters (2005) 2010-12, Vol.6 (6), p.736-739
Hauptverfasser: Kamilar, Jason M., Bribiescas, Richard G., Bradley, Brenda J.
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Bradley, Brenda J.
description Life-history theory predicts that reduced extrinsic risk of mortality should increase species longevity over evolutionary time. Increasing group size should reduce an individual's risk of predation, and consequently reduce its extrinsic risk of mortality. Therefore, we should expect a relationship between group size and maximum longevity across species, while controlling for well-known correlates of longevity. We tested this hypothesis using a dataset of 253 mammal species and phylogenetic comparative methods. We found that group size was a poor predictor of maximum longevity across all mammals, as well as within primates and rodents. We found a weak but significant group-size effect on artiodactyl longevity, but in a negative direction. Body mass was consistently the best predictor of maximum longevity, which may be owing to lower predation risk and/or lower basal metabolic rates for large species. Artiodactyls living in large groups may exhibit higher rates of extrinsic mortality because of being more conspicuous to predators in open habitats, resulting in shorter lifespans.
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central
subjects Animal Behaviour
Animals
Artiodactyla - genetics
Artiodactyla - physiology
Biological Evolution
Female
Humans
Life History
Lifespan
Longevity - genetics
Longevity - physiology
Male
Mammals - genetics
Mammals - physiology
Phylogeny
Population Density
Predation
Primates
Primates - genetics
Primates - physiology
Rodentia - genetics
Rodentia - physiology
Senescence
Sociality
title Is group size related to longevity in mammals?
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