First published online August 3, 2006
Journal of Experimental Biology 209, 3062-3070 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02371
Seasonal modulation of sickness behavior in free-living northwestern song sparrows (Melospiza melodia morphna)
Noah T. Owen-Ashley* and
John C. Wingfield
Department of Biology, Box 351800, University of Washington, Seattle,
WA 98195-1800, USA

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Fig. 1. Effect of lipopolysaccharide (LPS) or saline (SAL) treatment on aggression
during simulated territorial intrusion (STI) in spring (breeding) and winter
(nonbreeding). Values are means ± s.e.m.; N, values are given
in top left panel. *P<0.05.
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Fig. 2. Effect of lipopolysaccharide (LPS) or saline (SAL) treatment on aggression
after stimulated territorial intrusion (STI) in spring (breeding) and winter
(nonbreeding). Values are means ± s.e.m.; N, values are given
in top left panel. *P<0.05.
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Fig. 3. Effect of lipopolysaccharide (LPS) or saline (SAL) treatment on the %
change in body mass 24 h after injection. Values are means ± s.e.m.
(N values are given above bars). *P<0.05.
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Fig. 4. Seasonal differences in body mass (g), fat depots, and baseline
corticosterone levels (CORT; ng ml-1) before injection. Values are
means ± s.e.m. (N values are given within bars).
*P<0.05, ***P<0.001.
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© The Company of Biologists Ltd 2006