The resting metabolic rate ( RMR ) of birds correlates broadly with the climate of origin. In order to study the characteristics of thermoregulation in Little buntings and Chestnut buntings, are measured their resting...The resting metabolic rate ( RMR ) of birds correlates broadly with the climate of origin. In order to study the characteristics of thermoregulation in Little buntings and Chestnut buntings, are measured their resting metabolic rate ( RMR )at ambient temperature ( T a) ranged from 5℃ to 30℃ and calculated thermal conductance. The results are mainly as follows. 1. Thermal neutral zone ( TNZ ) for Little buntings ranged from 20℃ to 25℃ and for Chestnut buntings from 25℃ to 32 5℃. 2. The minimum metabolic rate of Little buntings and Chestnut buntings were 4 19 ml O 2/g·hr and 3 99 ml O 2/g·hr, respectively, which were 181% and 146% of the expected values that calculated from their body mass according to Aschoff and Pohl (1970). Above the upper critical temperature, RMR and T b increased. 3. The minimum thermal conductance ( C ) of Little buntings and Chestnut buntings were 0 26 ml O 2/g·hr·℃ and 0 23 ml O 2/g·hr·℃, respectively, which were 138% and 140% of the predicted values calcalated according to Aschoff (1981). In conclusion, the adaptation of Little buntings and Chestnut buntings to environmental climate were by the means of the slight higher level RMR and thermal conductance, and high intensity of chemical thermoregulation.展开更多
为了检验力竭性运动锻炼和饥饿是否对南方鲇Silurus meridonalisChen维持能量消耗和无氧代谢能力产生影响,在25℃条件下测定了维持日粮(1.5%body mass per day)和饥饿条件下南方鲇15d力竭性锻炼(5min chasing)和随后5d恢复过程静止代谢...为了检验力竭性运动锻炼和饥饿是否对南方鲇Silurus meridonalisChen维持能量消耗和无氧代谢能力产生影响,在25℃条件下测定了维持日粮(1.5%body mass per day)和饥饿条件下南方鲇15d力竭性锻炼(5min chasing)和随后5d恢复过程静止代谢率(VO2rest)和运动后过量耗氧(Excess post-exerciseVO2,EPOC)的变化。另外两组非锻炼组分别作为摄食和饥饿对照组。实验过程中摄食和饥饿对照组VO2rest显著下降(P<0.05),而摄食和饥饿对照组经过15d的锻炼显著上升(P<0.05)。经过5d的恢复2锻炼组VO2rest显著下降与对照组无显著差异。摄食和饥饿对照组力竭运动后代谢率峰值(VO2peak)在实验过程中显著下降(P<0.05),而摄食和饥饿锻炼组经过15d没有显著变化。锻炼取消后2锻炼组VO2peak显著下降至对照组水平。各锻炼组和对照组间过量耗氧均无显著差异。实验提示:(1)锻炼导致VO2rest和VO2peak显著提高,但影响可塑性大,5d恢复期后影响消失;(2)锻炼导致力竭运动后代谢恢复速率加快,5d恢复期后锻炼影响依然存在;(3)对饥饿和摄食组,锻炼的生理影响相似,但饥饿组VO2rest对锻炼更为敏感。展开更多
文摘The resting metabolic rate ( RMR ) of birds correlates broadly with the climate of origin. In order to study the characteristics of thermoregulation in Little buntings and Chestnut buntings, are measured their resting metabolic rate ( RMR )at ambient temperature ( T a) ranged from 5℃ to 30℃ and calculated thermal conductance. The results are mainly as follows. 1. Thermal neutral zone ( TNZ ) for Little buntings ranged from 20℃ to 25℃ and for Chestnut buntings from 25℃ to 32 5℃. 2. The minimum metabolic rate of Little buntings and Chestnut buntings were 4 19 ml O 2/g·hr and 3 99 ml O 2/g·hr, respectively, which were 181% and 146% of the expected values that calculated from their body mass according to Aschoff and Pohl (1970). Above the upper critical temperature, RMR and T b increased. 3. The minimum thermal conductance ( C ) of Little buntings and Chestnut buntings were 0 26 ml O 2/g·hr·℃ and 0 23 ml O 2/g·hr·℃, respectively, which were 138% and 140% of the predicted values calcalated according to Aschoff (1981). In conclusion, the adaptation of Little buntings and Chestnut buntings to environmental climate were by the means of the slight higher level RMR and thermal conductance, and high intensity of chemical thermoregulation.
文摘为了检验力竭性运动锻炼和饥饿是否对南方鲇Silurus meridonalisChen维持能量消耗和无氧代谢能力产生影响,在25℃条件下测定了维持日粮(1.5%body mass per day)和饥饿条件下南方鲇15d力竭性锻炼(5min chasing)和随后5d恢复过程静止代谢率(VO2rest)和运动后过量耗氧(Excess post-exerciseVO2,EPOC)的变化。另外两组非锻炼组分别作为摄食和饥饿对照组。实验过程中摄食和饥饿对照组VO2rest显著下降(P<0.05),而摄食和饥饿对照组经过15d的锻炼显著上升(P<0.05)。经过5d的恢复2锻炼组VO2rest显著下降与对照组无显著差异。摄食和饥饿对照组力竭运动后代谢率峰值(VO2peak)在实验过程中显著下降(P<0.05),而摄食和饥饿锻炼组经过15d没有显著变化。锻炼取消后2锻炼组VO2peak显著下降至对照组水平。各锻炼组和对照组间过量耗氧均无显著差异。实验提示:(1)锻炼导致VO2rest和VO2peak显著提高,但影响可塑性大,5d恢复期后影响消失;(2)锻炼导致力竭运动后代谢恢复速率加快,5d恢复期后锻炼影响依然存在;(3)对饥饿和摄食组,锻炼的生理影响相似,但饥饿组VO2rest对锻炼更为敏感。
