Mammalian aging, metabolism, and ecology: Evidence from the bats and marsupials

S. N. Austad, K. E. Fischer

Research output: Contribution to journalArticle

275 Scopus citations

Abstract

This study compared trends in body size, life span, metabolic rate, and ecology of bats and marsupials with those from mammals generally, using a 580 species data base. The linear logarithmic relationship between mammalian body mass and maximum longevity, deleting bats and marsupials, is used as a standard against which to measure life spans of particular mammal groups. Bats have maximum life spans a minimum of 3 times those of nonflying eutherians - a trend resulting from neither low basal metabolic rate, the ability to enter torpor, nor large relative brain size. Marsupials live about 80% as long as nonflying eutherians despite averaging lower basal metabolic rates; similarly, there is no effect of heterothermy or relative brain size. These results directly conflict with predictions of both 'rate of living' and brain-size mediated theories of aging. However, they are consistent with an evolutionary theory that posits exceptionally long life spans among mammals with reduced environmental vulnerability.

Original languageEnglish (US)
Pages (from-to)B47-B53
JournalJournals of Gerontology
Volume46
Issue number2
DOIs
StatePublished - Jan 1 1991

    Fingerprint

ASJC Scopus subject areas

  • Aging

Cite this