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First published online March 21, 2005
Journal of Experimental Biology 208, 1277-1285 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01493
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Effect of dietary fatty acid composition on depot fat and exercise performance in a migrating songbird, the red-eyed vireo

Barbara J. Pierce1,*, Scott R. McWilliams1, Timothy P. O'Connor2, Allen R. Place3 and Christopher G. Guglielmo4

1 Department of Natural Resources Science, University of Rhode Island, Kingston, RI, USA
2 Department of Genetic Medicine, Weill Cornell Medical College, New York, NY, USA
3 Center of Marine Biotechnology, University of Maryland, Baltimore, MD, USA
4 Division of Biological Sciences, University of Montana, Missoula, MT, USA



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  		Fig. 1. Percentage of dietary fat and furcular fat in birds composed of saturated and unsaturated fat for red-eyed vireos fed the 58%U and 82%U diets. Values are means ± S.E.M. (diet N=3, fat N=5). Inset white line within each bar is the percentage of dietary fat and furcular fat in birds composed of 18:2n6 fatty acid (S.E.M. is less than bar width). Different letters above the bars denote significant differences (P<0.05) in percentage unsaturated fat and 18:2n6 between diet groups.

 


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  		Fig. 2. Plasma metabolite concentrations in red-eyed vireos prior to and immediately following exercise. Values are means ± S.E.M. (N=5). Asterisks above the bars denote significant differences in plasma metabolite concentrations (P<0.05) just prior to and immediately following exercise. Diet did not influence plasma metabolite concentrations prior to or immediately following exercise (P>0.21 for each metabolite) and so is not shown.

 


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  		Fig. 3. Mass-specific resting metabolic rate (RMR) and mass-specific peak metabolic rate (MRpeak) for two groups of red-eyed vireos fed diets with different fatty acid composition (see Table 2). The asterisk denotes a significant difference (P<0.05, N=5) between diet groups. Boxes show the 25th, 50th and 75th percentile, whiskers show the 10th and 90th percentile, and means are closed circles.

 

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© The Company of Biologists Ltd 2005