Document Detail

Costs and benefits of within-group spatial position: a feeding competition model.
MedLine Citation:
PMID:  17354992     Owner:  NLM     Status:  MEDLINE    
An animal's within-group spatial position has several important fitness consequences. Risk of predation, time spent engaging in antipredatory behavior and feeding competition can all vary with respect to spatial position. Previous research has found evidence that feeding rates are higher at the group edge in many species, but these studies have not represented the entire breadth of dietary diversity and ecological situations faced by many animals. In particular the presence of concentrated, defendable food patches can lead to increased feeding rates by dominants in the center of the group that are able to monopolize or defend these areas. To fully understand the tradeoffs of within-group spatial position in relation to a variety of factors, it is important to be able to predict where individuals should preferably position themselves in relation to feeding rates and food competition. A qualitative model is presented here to predict how food depletion time, abundance of food patches within a group, and the presence of prior knowledge of feeding sites affect the payoffs of different within-group spatial positions for dominant and subordinate animals. In general, when feeding on small abundant food items, individuals at the front edge of the group should have higher foraging success. When feeding on slowly depleted, rare food items, dominants will often have the highest feeding rates in the center of the group. Between these two extreme points of a continuum, an individual's optimal spatial position is predicted to be influenced by an additional combination of factors, such as group size, group spread, satiation rates, and the presence of producer-scrounger tactics.
Ben T Hirsch
Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  The Quarterly review of biology     Volume:  82     ISSN:  0033-5770     ISO Abbreviation:  Q Rev Biol     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-03-14     Completed Date:  2007-04-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376515     Medline TA:  Q Rev Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9-27     Citation Subset:  IM    
Department of Anthropology, Stony Brook University Stony Brook, New York 11794, USA. BTHIRSCH@IC.SUNYSB.EDU
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MeSH Terms
Competitive Behavior / physiology*
Feeding Behavior / physiology*,  psychology*
Population Dynamics
Predatory Behavior / physiology*

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

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