Document Detail


Grazing and vigilance by Soay sheep on Lundy island: influence of group size, terrain and the distribution of vegetation.
MedLine Citation:
PMID:  15963661     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Animals allocate the time spent on different behaviours according to nutritional requirements, the distribution of food and the risk of predation. When the perceived predation risk is high, animals primarily behave in ways to increase their safety such as regularly scanning their surroundings, forming large groups and feeding in habitats with cover or high visibility. This study investigated which factors Soay sheep (Ovis aries) are most sensitive to in allocating time to different behaviours when the risk of predation is negligible. Continuous focal sampling was used to record the behaviour of the free-ranging Soay sheep on Lundy Island and measures of vegetation, group size and terrain were also recorded. Stepwise multiple regression produced a model of grazing with terrain and range of grass coverage as predictors and a model of vigilance with terrain as a predictor. Sheep grazed for longer on the slopes and as the range of grass cover decreased. They were more vigilant on the slopes. The results support the view that the group size effect largely depends on anti-predatory vigilance and suggest that time-budgets are more sensitive to other factors in the absence of predation.
Authors:
L Hopewell; R Rossiter; E Blower; L Leaver; K Goto
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Behavioural processes     Volume:  70     ISSN:  0376-6357     ISO Abbreviation:  Behav. Processes     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-08-30     Completed Date:  2006-01-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7703854     Medline TA:  Behav Processes     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  186-93     Citation Subset:  IM    
Affiliation:
School of Psychology, University of Exeter, Washington Singer Laboratories, Devon EX4 4QG, UK. l.j.hopewell@ex.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Animals
Feeding Behavior*
Plants
Population Density
Predatory Behavior
Risk Factors
Sheep*
Social Behavior*
Visual Perception

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


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