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First published online October 19, 2007
Journal of Experimental Biology 210, 3798-3804 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.003897

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Allometric scaling in centrarchid fish: origins of intra- and inter-specific variation in oxidative and glycolytic enzyme levels in muscle

Rhiannon Davies and Christopher D. Moyes^*

Department of Biology, Queen's University, Kingston, Ontario, K7L 3N6, Canada

View larger version (11K): [in this window] [in a new window]   Fig. 1. Whole animal metabolic rate. (A) Estimates of metabolic rate as calculated by O2 consumption (mg O2 h–1) at 21°C. BG, bluegill sunfish: y=0.93x–0.72, N=10, R2=0.81; PS, pumpkinseed sunfish: y=0.87x–0.50, N=18, R2=0.62; LM, largemouth bass: y=0.94x–0.54, N=14, R2=0.93; SM, smallmouth bass: y=0.96x–0.51, N=9, R2=0.97. (B) Log–log relationships were used to predict metabolic rate (mg O2 kg–1 h–1) of a standardized 15 g, 50 g and 150 g fish (±95% confidence interval).

View larger version (15K): [in this window] [in a new window]   Fig. 2. Activities of (A,C) pyruvate kinase (PK) and (B,D) citrate synthase (CS), relative to (A,B) mass (U g–1 body mass) and (C,D) DNA (U g–1 DNA). Symbols for species are the same as in Fig. 1. Linear regression equations: (A) bluegill sunfish, y=0.19x+1.89, N=15, R2=0.47; pumpkinseed sunfish, y=0.22x+2.02, N=19, R2=0.39; largemouth bass, y=0.12x+1.94, N=11, R2=0.56; smallmouth bass, y=0.08x+2.58, N=11, R2=0.17; (B) bluegill sunfish, y=0.34x+2.54, N=15, R2=0.62; pumpkinseed sunfish, y=0.36x+2.70, N=19, R2=0.58; largemouth bass, y=0.37x+2.71, N=11, R2=0.61; smallmouth bass, y=0.37x+2.97, N=11, R2=0.54; (C) bluegill sunfish, y=–0.17x+0.25, N=15, R2=0.48; pumpkinseed sunfish, y=–0.19x+0.32, N=19, R2=0.39; largemouth bass, y=–0.17x+0.55, N=11, R2=0.42; smallmouth bass, y=–016x+0.75, N=11, R2=0.77. (D) Bluegill sunfish, y=–0.02x+0.91, N=15, R2=0.01; pumpkinseed sunfish, y=–0.05x+0.99, N=19, R2=0.04; largemouth bass, y=–0.07x+1.33, N=11, R2=0.08; smallmouth bass, y=–0.13x+1.14, N=11, R2=0.32.

View larger version (15K): [in this window] [in a new window]   Fig. 3. (A,B) Relative PK and CS catalytic activities (U) and mRNA levels and (C,D) PK and CS catalytic activities relative to mRNA levels for each enzyme. Symbols for species are the same as in Fig. 1. The regression lines for panel C are for illustrative purposes.

View larger version (7K): [in this window] [in a new window]   Fig. 4. mg DNA:g tissue (A) and RNA:DNA ratios (B) for each centrarchid species. Symbols for species are the same as in Fig. 1. Linear regression equations: (A) bluegill sunfish, y=–0.15x–0.66, N=15, R2=0.39; pumpkinseed sunfish, y=–0.14x–0.68, N=19, R2=0.22; largemouth bass, y=–0.24x–0.78, N=11, R2=0.52; smallmouth bass, y=–0.28x–0.39, N=11, R2=0.67; (B) bluegill sunfish y=0.09x+0.44, N=15, R2=0.06; pumpkinseed sunfish, y=0.21x+0.24, N=17, R2=0.16; largemouth bass, y=0.18x+0.62, N=11, R2=0.59; smallmouth bass, y=0.10x+0.65, N=11, R2=0.08.

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