期刊
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
卷 140, 期 4, 页码 445-451出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpb.2005.02.008
关键词
continuous-flow respirometer; energy expended during SDA; metabolic rate; meal size; peak VO2; SDA duration; specific dynamic action; Silurus meridionalis Chen
Effect of relative meal size (0.6-24%) on specific dynamic action (SDA) was assessed in southern, catfish juveniles (48.2 +/- 3.2 g) at 27.5 degrees C. Cutlets of freshly killed loach species were used as test diet. Energy expended during SDA was linearly correlated with relative meal size (r=0.949, p < 0.001, N=47). There was no significant difference in SDA coefficient (energy expended on SDA quantified as a percentage of the energy content of the meal) among different relative meal size groups. Factorial metabolic scope increased from 1.47 to 4.08 when the relative meal size increased from 0.6% to 24%. The peak VO2 increased with meal size, but levelled when relative meal size gradually increased to the maximum. SDA duration showed a S-type (slow-fast-slow) increase course with increased meal size. The results of this study suggest that the high postprandial factorial metabolic scope and a trapezoid SDA curve might be the adaptation strategy of warmwater sit-and-wait fish under the natural selection of evolution related to long-term food resources. (c) 2005 Elsevier Inc. All rights reserved.
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