Document Detail


A lifetime perspective on foraging and mortality.
MedLine Citation:
PMID:  12069483     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Food intake carries many potential risks which may impair an animal's reproductive success not only in the current breeding cycle, but also for the rest of its lifetime. We examine the lifetime trade-off between the costs and benefits of food intake by presenting a simple animal foraging model, where each unit of food eaten carries with it a risk of mortality. We show that the optimal food intake rate over an animal's lifetime, for both semelparous and iteroparous animals, is not maximal. Instead, animals are required to strike a balance between the immediate reproductive benefits of gathering food and the future reproductive costs incurred by the food's mortality risk. This balance depends upon the lifespan of the animal as well as the nature of the risk. Different mortality risks are compared and it is shown that a mortality risk per unit time spent foraging is not, in general, equivalent to a mortality risk per unit of food consumed. The results suggest that a mortality risk per unit of food consumed, such as that presented by the presence of a toxin or of a parasite in the diet, has important consequences for feeding behaviour and is a possible factor involved in food intake regulation.
Authors:
Jonathan Yearsley; Ian M Hastings; Iain J Gordon; Ilias Kyriazakis; Andrew W Illius
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of theoretical biology     Volume:  215     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-06-18     Completed Date:  2002-08-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  385-97     Citation Subset:  IM    
Copyright Information:
Copyright 2002 Elsevier Science Ltd. All rights reserved.
Affiliation:
Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, AB15 8QH, UK. j.yearsley@mluri.sari.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Animals
Bacteria
Death*
Eating*
Feeding Behavior
Models, Biological
Parasites
Risk
Time Factors

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


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