Document Detail

Temporal scales, trade-offs, and functional responses in red deer habitat selection.
MedLine Citation:
PMID:  19341140     Owner:  NLM     Status:  MEDLINE    
Animals selecting habitats often have to consider many factors, e.g., food and cover for safety. However, each habitat type often lacks an adequate mixture of these factors. Analyses of habitat selection using resource selection functions (RSFs) for animal radiotelemetry data typically ignore trade-offs, and the fact that these may change during an animal's daily foraging and resting rhythm on a short-term basis. This may lead to changes in the relative use of habitat types if availability differs among individual home ranges, called functional responses in habitat selection. Here, we identify such functional responses and their underlying behavioral mechanisms by estimating RSFs through mixed-effects logistic regression of telemetry data on 62 female red deer (Cervus elaphus) in Norway. Habitat selection changed with time of day and activity, suggesting a trade-off in habitat selection related to forage quantity or quality vs. shelter. Red deer frequently used pastures offering abundant forage and little canopy cover during nighttime when actively foraging, while spending much of their time in forested habitats with less forage but more cover during daytime when they are more often inactive. Selection for pastures was higher when availability was low and decreased with increasing availability. Moreover, we show for the first time that in the real world with forest habitats also containing some forage, there was both increasing selection of pastures (i.e., not proportional use) and reduced time spent in pastures (i.e., not constant time use) with lowered availability of pastures within the home range. Our study demonstrates that landscape-level habitat composition modifies the trade-off between food and cover for large herbivorous mammals. Consequently, landscapes are likely to differ in their vulnerability to crop damage and threat to biodiversity from grazing.
Inger Maren Rivrud Godvik; Leif Egil Loe; Jon Olav Vik; Vebjørn Veiberg; Rolf Langvatn; Atle Mysterud
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ecology     Volume:  90     ISSN:  0012-9658     ISO Abbreviation:  Ecology     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-04-03     Completed Date:  2009-05-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043541     Medline TA:  Ecology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  699-710     Citation Subset:  IM    
Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, P.O. Box 1066 Blindern, N-0316 Oslo, Norway.
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MeSH Terms
Behavior, Animal / physiology*
Deer / physiology*
Feeding Behavior / physiology*
Logistic Models
Time Factors

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

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