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First published online May 24, 2005
Journal of Experimental Biology 208, 2055-2062 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01602

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Influence of local adaptation and interstock hybridization on the cardiovascular performance of largemouth bass Micropterus salmoides

Steven J. Cooke^* and David P. Philipp

Department of Natural Resources and Environmental Sciences, University of Illinois, and Center for Aquatic Ecology, Illinois Natural History Survey, 607 East Peabody Drive, Champaign, IL 61820, USA

View larger version (29K): [in a new window]   Fig. 1. Effects of water temperature and stock on the resting cardiac performance of largemouth bass. (A) Cardiac output; (B) heart rate; (C) stroke volume. Asterisks indicate significantly different (P<0.05) values within a stock at the two different temperatures. Dissimilar letters indicate significantly different (P<0.05) values between stocks at each temperature. Bold numbers represent stock-specific Q10 values for all three cardiac variables. Additional details on the statistical tests are given in Table 2. Values are means ± 1 S.E.M. Sample sizes are provided in Table 1.

View larger version (26K): [in a new window]   Fig. 2. Effects of water temperature and stock on the maximal cardiac performance of largemouth bass. (A) Cardiac output; (B) heart rate; (C) stroke volume. Asterisks indicate significantly different (P<0.05) values within a stock at the two different temperatures. Dissimilar letters indicate significantly different (P<0.05) values between stocks at each temperature. Additional details on the statistical tests are given in Table 2. Values are means ± 1 S.E.M. Sample sizes are provided in Table 1.

View larger version (24K): [in a new window]   Fig. 3. Effects of water temperature and stock on the recovery of cardiac variables of largemouth bass following exhaustive exercise. Asterisks indicate significantly different (P<0.05) values within a stock at the two different temperatures. Dissimilar letters indicate significantly different (P<0.05) values between stocks at each temperature. Additional details on the statistical tests are given in Table 2. Values are means ± 1 S.E.M. Sample sizes are provided in Table 1.