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First published online February 27, 2009
Journal of Experimental Biology 212, 808-814 (2009)
Published by The Company of Biologists 2009
doi: 10.1242/jeb.025528
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Phenotypic flexibility of traits related to energy acquisition in mice divergently selected for basal metabolic rate (BMR)

Aneta Ksiazek*, Jan Czerniecki and Marek Konarzewski

Institute of Biology, University of Bialystok, Swierkowa 20b, 15-950 Bialystok, Poland


Figure 1
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  		Fig. 1. Food consumption (A) and apparent digestive efficiency (B) in control mice maintained at 23°C (denoted as 0) and exposed to 5°C for two, four and six days, respectively. Values are least-square means from ANCOVA/ANOVA (± s.e.m.). In this and subsequent graphs, closed circles and solid lines indicate low-basal metabolic rate mice (L-BMR) whereas open squares and broken lines indicate high-BMR (H-BMR) mice.

 

Figure 2
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  		Fig. 2. Metabolic load exerted on small intestine (A), kidneys (B), heart (C) and liver mass (D) following two-, four- and six-day-exposure to 5°C. To demonstrate the magnitude of these loads, the mass of internal organs is plotted against food consumption (small intestine) and digestible food intake (the remaining organs). Here and in Fig. 3 position of points from left to right reflects changes in mass between subsequent two-day periods of the experiment. Values are least-square means from ANCOVA (± s.e.m.) presented in Table 1. Different superscripted characters represent significant differences between groups (within lines) tested by pair-wise t-tests, after applying a Bonferroni correction. For further details, see Fig. 1.

 

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  		Fig. 3. Activity of citrate synthase (CS) in liver (A), kidneys (B) and heart mass (C) following two-, four- and six-day-exposure to 5°C. Specific activity of CS is expressed in international units defined as µmol substrate transformed to product min–1 g–1 of organ wet mass. Values are least-square means from ANOVA (± s.e.m.) presented in Table 1. For further details, see Figs 1 and 2.

 

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