Document Detail

Effects of day-length and food availability on food caching, mass and fat reserves in black-capped chickadees (Poecile atricapillus).
MedLine Citation:
PMID:  15763585     Owner:  NLM     Status:  MEDLINE    
Many animals seasonally change energy stores such as food caches and fat deposits. Two factors that potentially influence energy stores are changes in day-length and food availability. We investigated food storing and fat levels in black-capped chickadees to determine how they are affected by changes in duration of light period and duration of food availability. Because previous studies have confounded the effects of photoperiod and the effects of duration of access to food we manipulated these variables independently. Birds were exposed to either long days (15 h light with 15 h of food availability), long day light exposure with short day food availability (15 h light, 9 h food), or short days (9 h light, 9 h food). We measured mass, body fat and the number of sunflower seeds stored in 1-h test sessions for 2 weeks prior and 3 weeks following this manipulation. Neither photoperiod nor food availability had an effect on food storing behavior. Fat and body mass transiently increased in both groups exposed to short duration of food availability, regardless of photoperiod, but did not increase in birds exposed to long days with long duration food availability. These results indicate that duration of time to feed may affect seasonal changes in energy reserves in addition to any effects of photoperiod.
Helen Karpouzos; Alexandra M Hernandez; Elizabeth A MacDougall-Shackleton; Scott A MacDougall-Shackleton
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Physiology & behavior     Volume:  84     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-03-14     Completed Date:  2005-08-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  465-9     Citation Subset:  IM    
Department of Psychology, University of Western Ontario, London, Canada ON N6A 5C2.
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MeSH Terms
Adipose Tissue / metabolism*
Appetitive Behavior*
Body Composition / physiology
Body Weight / physiology
Energy Metabolism / physiology
Feeding Behavior / physiology*
Food Supply*
Songbirds / physiology*
Stereotyped Behavior*

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

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