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First published online June 15, 2007
Journal of Experimental Biology 210, 2361-2367 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.003517
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Relationship between avian growth rate and immune response depends on food availability

Pawel Brzek* and Marek Konarzewski

Department of Animal Ecology, University of Bialystok, Swierkowa 20B, 15-950 Bialystok, Poland


Figure 1
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  		Fig. 1. Graphic scheme of applied experimental design. Body mass of sand martin nestlings at the beginning of the experiment, at the antigen injection (end of day 2, marked as solid vertical line), and at the conclusion of the experiment (end of day 3) are shown. AL, nestlings fed ad libitum; I, nestlings subjected to an intermediate feeding regime; FR, nestlings fed with a limited amount of food. Mean values (connected by broken lines for each feeding regime), and s.e.m. (vertical limits of boxes) are shown. Body mass changes during days 1-2 are referred to as body mass increments before injection, whereas body mass changes during day 3 are referred to as body mass increments after injection.

 

Figure 2
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  		Fig. 2. (A) Total body mass increments (least square means corrected for initial body mass) in the course of our study; (B) body mass increments (least square means corrected for body mass at injection) during day 3, i.e. following the immune challenge, and (C) magnitude of phytohaemagglutinin (PHA)-induced swelling response (an estimate of immune function) in nestlings subjected to three feeding regimes. All variables are log-transformed. Horizontal lines denote mean values, boxes denote s.e.m. Squares, triangles and circles denote food-restricted group (FR), intermediate group (I) and ad libitum fed group (AL), respectively. Different letters above symbols indicate significant between-group differences (P<0.05), tested by pair-wise t-tests.

 

Figure 3
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  		Fig. 3. (A) Relationship between the magnitude of phytohaemagglutinin (PHA)-induced swelling response and total body mass increments in the course of the whole experiment, and (B) relationship between the magnitude of PHA-induced swelling response and body mass increments during day 3, i.e. following the immune challenge in the food-restricted group (FR; squares), intermediate group (I; triangles), and ad libitum fed group (AL; circles). All variables are log-transformed. Broken lines denote within-group trends, whereas solid lines denote the trend across all experimental groups.

 




© The Company of Biologists Ltd 2007