Document Detail

Animal movement in dynamic landscapes: interaction between behavioural strategies and resource distributions.
MedLine Citation:
PMID:  18317815     Owner:  NLM     Status:  MEDLINE    
Most ecological and evolutionary processes are thought to critically depend on dispersal and individual movement but there is little empirical information on the movement strategies used by animals to find resources. In particular, it is unclear whether behavioural variation exists at all scales, or whether behavioural decisions are primarily made at small spatial scales and thus broad-scale patterns of movement simply reflect underlying resource distributions. We evaluated animal movement responses to variable resource distributions using the grey teal (Anas gracilis) in agricultural and desert landscapes in Australia as a model system. Birds in the two landscapes differed in the fractal dimension of their movement paths, with teal in the desert landscape moving less tortuously overall than their counterparts in the agricultural landscape. However, the most striking result was the high levels of individual variability in movement strategies, with different animals exhibiting different responses to the same resources. Teal in the agricultural basin moved with both high and low tortuosity, while teal in the desert basin primarily moved using low levels of tortuosity. These results call into question the idea that broad-scale movement patterns simply reflect underlying resource distributions, and suggest that movement responses in some animals may be behaviourally complex regardless of the spatial scale over which movement occurs.
David A Roshier; Veronica A J Doerr; Erik D Doerr
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Oecologia     Volume:  156     ISSN:  0029-8549     ISO Abbreviation:  Oecologia     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-10-10     Completed Date:  2008-11-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  465-77     Citation Subset:  IM    
Institute of Land, Water and Society, Charles Sturt University, Albury, NSW 2640, Australia.
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MeSH Terms
Analysis of Variance
Behavior, Animal / physiology*
Ducks / physiology*
Models, Theoretical*
Movement / physiology*

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