Document Detail

Stopover decision during migration: physiological conditions predict nocturnal restlessness in wild passerines.
MedLine Citation:
PMID:  19324648     Owner:  NLM     Status:  MEDLINE    
During migration, a number of bird species rely on stopover sites for resting and feeding before and after crossing ecological barriers such as deserts or seas. The duration of a stopover depends on the combined effects of environmental factors, endogenous programmes and physiological conditions. Previous studies indicated that lean birds prolong their refuelling stopover compared with fat birds; however, the quantitative relationship between physiological conditions and stopover behaviour has not been studied yet. Here, we tested in a large sample of free-living birds of three European passerines (whinchats, Saxicola rubetra, garden warblers, Sylvia borin and whitethroats, Sylvia communis) whether the amount of migratory restlessness (Zugunruhe) shown at a stopover site depends on physiological conditions. An integrated measure of condition based on body mass, amount of subcutaneous fat and thickness of pectoral muscles strongly predicted the intensity of Zugunruhe shown in recording cages in the night following capture. These results provide novel and robust quantitative evidence in support of the hypothesis that the amount of energy reserves plays a major role in determining the stopover duration in migratory birds.
Leonida Fusani; Massimiliano Cardinale; Claudio Carere; Wolfgang Goymann
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-03-18
Journal Detail:
Title:  Biology letters     Volume:  5     ISSN:  1744-9561     ISO Abbreviation:  Biol. Lett.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-05-12     Completed Date:  2009-07-10     Revised Date:  2013-06-02    
Medline Journal Info:
Nlm Unique ID:  101247722     Medline TA:  Biol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  302-5     Citation Subset:  IM    
Dipartimento di Biologia ed Evoluzione, Università di Ferrara, Via Borsari 46, 44100 Ferrara, Italy.
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MeSH Terms
Adipose Tissue / physiology*
Animal Migration / physiology*
Body Composition / physiology*
Decision Making
Passeriformes / physiology*
Time Factors

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