Cardiorespiratory physiology and swimming energetics of a high-energy-demand teleost, the yellowtail kingfish (Seriola lalandi)
Cardiorespiratory physiology and swimming energetics of a high-energy-demand teleost, the yellowtail kingfish (Seriola lalandi)
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DOI：
10.1242/jeb.02440
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发表时间：
2006-10-01
影响因子：
2.8
通讯作者：
Seymour, R. S.
中科院分区：
文献类型：
--
作者：
Clark, T. D.;Seymour, R. S.
利用游泳式呼吸仪研究了运动和温度对活动硬骨鱼--黄尾金鱼(Seriola Lalandi)心肺功能的影响。拉兰迪的标准有氧代谢率(SMR)(平均体重2.1公斤)在20摄氏度时为1.55毫克分(-1)公斤(-1)，在25摄氏度时为3.31毫克分(-1)公斤(-1)。随着温度的升高，标准有氧代谢率增加2.1倍，心率从77次增加到117次分钟(-1)，心脏每搏量保持在0.38毫升搏动(-1)公斤(-1)，动脉血和混合静脉血的含氧量之差[(Ca-O2-CV(O2))]从0.06微升至0.08毫克毫升(-1)。然而，在两种温度下的最大有氧运动(2.3BL S(-1))中，心输出量的增加被限制在大约1.3倍，并且氧耗率的增加(在20℃时高达10.93 mg min(-1)kg(-1)和在25℃时高达13.32 mg min(-1)kg(-1))主要是通过将(Ca-O2-CV(O2))增大到20℃时的0.29 mg ml(-1)和25℃时的0.25 mg ml(-1)来实现的。拉兰迪的心脏通常在给定的温度下接近其最大容量，运动引起的有氧代谢变化在很大程度上依赖于高的血液携氧能力和(Ca-O2-CV(O2))。在最优游泳速度(U-opt)分别为1.2BL·S(-1)和1.7BL·S(-1)的条件下，20℃和25℃时的总有氧运输成本分别为0.06 mg kg(-1)和0.09 mg kg(-1)。这些值与鲑鱼和金枪鱼的报道值相当，这意味着运动模式的种间多样性(例如亚心脉形、心脉形和锥形)并不伴随着游泳效率的相似多样性。当游泳速度增加到Uopt以上时，GCOT保持在较低的水平，这可能部分是由于从盖式换气到公羊换气的渐进式转变所节省的能量。
This study utilizes a swimming respirometer to investigate the effects of exercise and temperature on cardiorespiratory function of an active teleost, the yellowtail kingfish (Seriola lalandi). The standard aerobic metabolic rate (SMR) of S. lalandi ( mean body mass 2.1 kg) ranges from 1.55 mg min(-1) kg(-1) at 20 degrees C to 3.31 mg min(-1) kg(-1) at 25 degrees C. This 2.1-fold increase in SMR with temperature is associated with a 1.5-fold increase in heart rate from 77 to 117 beats min(-1), while cardiac stroke volume remains constant at 0.38 ml beat(-1) kg(-1) and the difference in oxygen content between arterial and mixed venous blood [(Ca-O2-Cv(O2))] increases marginally from 0.06 to 0.08 mg ml(-1). During maximal aerobic exercise (2.3 BL s(-1)) at both temperatures, however, increases in cardiac output are limited to about 1.3-fold, and increases in oxygen consumption rates (up to 10.93 mg min(-1) kg(-1) at 20 degrees C and 13.32 mg min(-1) kg(-1) at 25 degrees C) are mediated primarily through augmentation of (Ca-O2-Cv(O2)) to 0.29 mg ml(-1) at 20 degrees C and 0.25 mg ml(-1) at 25 degrees C. It seems, therefore, that the heart of S. lalandi routinely works close to its maximum capacity at a given temperature, and changes in aerobic metabolism due to exercise are greatly reliant on high blood oxygen-carrying capacity and (Ca-O2-Cv(O2)). Gross aerobic cost of transport (GCOT) is 0.06 mg kg(-1) BL-1 at 20 degrees C and 0.09 mg kg(-1) BL-1 at 25 degrees C at the optimal swimming velocities (U-opt) of 1.2 BL s(-1) and 1.7 BL s(-1), respectively. These values are comparable with those reported for salmon and tuna, implying that the interspecific diversity in locomotor mode ( e. g. sub-carangiform, carangiform and thunniform) is not concomitant with similar diversity in swimming efficiency. A low GCOT is maintained as swimming velocity increases above Uopt, which may partly result from energy savings associated with the progressive transition from opercular ventilation to ram ventilation.