Document Detail

Predatory senescence in ageing wolves.
MedLine Citation:
PMID:  19780789     Owner:  NLM     Status:  MEDLINE    
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.
Daniel R MacNulty; Douglas W Smith; John A Vucetich; L David Mech; Daniel R Stahler; Craig Packer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-09-23
Journal Detail:
Title:  Ecology letters     Volume:  12     ISSN:  1461-0248     ISO Abbreviation:  Ecol. Lett.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-11-25     Completed Date:  2010-02-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101121949     Medline TA:  Ecol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  1347-56     Citation Subset:  IM    
Department of Ecology, Evolution, and Behaviour, University of Minnesota, St. Paul, MN 55108, USA.
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MeSH Terms
Aging / physiology*
Albumins / metabolism
Predatory Behavior*
Wolves / physiology*,  psychology*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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