Predatory senescence in ageing wolves

Daniel R. MacNulty, Douglas W. Smith, John A. Vucetich, L. David Mech, Daniel R. Stahler, Craig Packer

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

It is well established that ageing handicaps the ability of prey to escape predators, yet surprisingly little is known about how ageing affects the ability of predators to catch prey. Research into long-lived predators has assumed that adults have uniform impacts on prey regardless of age. Here we use longitudinal data from repeated observations of individually-known wolves (Canis lupus) hunting elk (Cervus elaphus) in Yellowstone National Park to demonstrate that adult predatory performance declines with age and that an increasing ratio of senescent individuals in the wolf population depresses the rate of prey offtake. Because this ratio fluctuates independently of population size, predatory senescence may cause wolf populations of equal size but different age structure to have different impacts on prey populations. These findings suggest that predatory senescence is an important, though overlooked, factor affecting predator-prey dynamics.

Original languageEnglish (US)
Pages (from-to)1347-1356
Number of pages10
JournalEcology letters
Volume12
Issue number12
DOIs
StatePublished - Dec 2009

Keywords

  • Age structure
  • Ageing
  • Elk
  • Hunting ability
  • Life history
  • Predator-prey interaction
  • Senescence
  • Serum albumin
  • Survival
  • Wolf

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