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饥饿过程鲇鱼幼鱼静止代谢、身体组成及与力竭性运动后过量耗氧的关系
引用本文:汤洪芬,曹振东,付世建.饥饿过程鲇鱼幼鱼静止代谢、身体组成及与力竭性运动后过量耗氧的关系[J].水生生物学报,2010,34(1):190.
作者姓名:汤洪芬  曹振东  付世建
作者单位:重庆师范大学进化生理与行为学实验室,重庆市动物学重点实验室,重庆,400047
基金项目:国家自然科学基金,重庆市自然科学基金 
摘    要:将33尾鲇鱼(Silurus asotus)幼鱼(32.14±1.40)g在(25±1)℃条件下驯化2周后分5组(0、1、2、4、8周)进行饥饿处理;分别测定了各处理组实验鱼的静止耗氧率、力竭性运动后的过量耗氧(EPOC)并对鱼体组成进行了分析。实验结果显示:各处理组实验鱼的静止耗氧率分别为(2.21±0.15)、(1.63±0.04)、(1.64±0.13)、(1.44±0.08)、(0.98±0.09)mgO2/kg·min,其中饥饿1、2、4周组之间无显著差异,却都显著低于0组、高于8周组的水平(P0.05),呈现一个静止代谢"平台期";鱼体组成的变化表明,该"平台期"的主要供能物质为脂肪,其后则主要由蛋白质供能;各组实验鱼力竭性运动后耗氧率峰值(VO2 peak)立即(2min)出现,随后逐渐下降至稳定耗氧水平(VO2 steady),EPOC总量(Excess VO2)分别为(31.8±6.06)、(76.67±4.34)、(69.2±5.89)、(70.41±3.12)、(38.28±2.72)mgO2/kg,其中饥饿1、2、4周组均显著高于饥饿0和8周组的水平(P0.05),出现无氧运动功能补偿的"效应期"。通过鲇鱼幼鱼静止代谢"平台期"与其功能补偿"效应期"在时间上完全吻合的现象,揭示鱼类的功能补偿效应与其静止代谢水平之间存在的密切关联。

关 键 词:赭纤虫  RNA聚合酶Ⅱ  锌指  多克隆抗体  进化  饥饿  鲇鱼  静止耗氧率  鱼体组成  过量耗氧

THE RELATIONSHIP AMONG RESTING METABOLIC RATE,BODY COMPOSITION AND EXCESS POST-EXCESS OXYGEN CONSUMPTION DURING FASTING IN SILURUS ASOTUS
TANG Hong-Fen,CAO Zhen-Dong,FU Shi-Jian.THE RELATIONSHIP AMONG RESTING METABOLIC RATE,BODY COMPOSITION AND EXCESS POST-EXCESS OXYGEN CONSUMPTION DURING FASTING IN SILURUS ASOTUS[J].Acta Hydrobiologica Sinica,2010,34(1):190.
Authors:TANG Hong-Fen  CAO Zhen-Dong  FU Shi-Jian
Institution:TANG Hong-Fen,CAO Zhen-Dong , FU Shi-Jian(Laboratory of Evolutionary Physiology , Behavior,Chongqing Key Laboratory of Animal Biology,Chongqing Normal University,Chongqing 400047)
Abstract:The resting metabolic rate (VO_(2rest)), body composition and excess post-exercise oxygen consumption(EPOC)of 33 juvenile Silurus asotus (32.14±1.40)g were investigated after 0, 1, 2, 4 and 8 weeks' starvation under (25±1)℃. VO2rest were (2.21±0.15), (1.63±0.04), (1.64±0.13), (1.44±0.08) and (0.98±0.09) mgO_2/kg/min after 0, 1,2, 4 and 8 weeks' starvation, respectively. There were no significant difference in VO_(2rest) among 1, 2 and 4 week starvation groups, whereas, all the three groups were significantly lower than that of 0 week group but significantly higher than that of 8 week group (P<0.05). Combined the above results with which of body composition, it suggested that there existed a "stable period" in VO_(2rest) during long term starvation, and the energy expenditure in this period was mainly provided by catabolism of lipid rather than protein, which might play a more important role in energy supply after "stable period". The oxygen consumption was immediately increased to peak value at 2 rain after exhaustive exercise and slowly decreased to a stabilized level. The excess post-exercise oxygen consumptions were (31.8±6.06), (76.67±4.34),(69.2±5.89), (70.41±3.12) and (38.28±2.72) mgO_2/kg after 0, 1, 2, 4 and 8 weeks' starvation, respectively. The excess post-exercise oxygen consumptions of 1, 2 and 4 week starvation groups were significantly higher than both those of 0 and 8 week groups (P<0.05), which suggested there was a "exhibition period" in function compensation. The time course of "stable period" in VO_(2rest) and "exhibition period" in function compensation were identical, which suggested that there existed close relationship between metabolic expenditure and physiological function compensation in Silurus asotus.
Keywords:Starvation  Silurus asotus  Resting metabolic rate  Body composition  Excess post-exercise oxygen consumption
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