Mechanism of body cavity temperature regulation of chum salmon (Oncorhynchus keta) during homing migration in the North Pacific Ocean
Mechanism of body cavity temperature regulation of chum salmon (Oncorhynchus keta) during homing migration in the North Pacific Ocean
复制标题
DOI：
10.1111/j.1365-2419.2004.00323.x
复制
发表时间：
2005-03-01
影响因子：
2.6
通讯作者：
Ishida, Y
中科院分区：
文献类型：
--
作者：
Azumaya, T;Ishida, Y
利用档案标签研究了5种大麻哈鱼（Oncorhynchus凯塔）归巢洄游过程中的垂直运动模式。白天的深度、环境温度和体腔温度的标准差均大于夜间。在白天，除了昼夜垂直运动模式，在开阔的海洋中观察到的周期小于1小时的温跃层的垂直运动。在这些短期垂直运动频繁的时期，体腔温度与环境温度之间的差异较大，而体腔温度的方差小于环境温度。根据随机模拟的结果，与随机垂直运动相比，由于这些周期性的高频运动，体腔温度的变化被示出为减小。通过热平衡模型估算的全身传热系数k（s（-1））为1.48 × 10（-3）。鲑鱼的K值比大眼金枪鱼的K值大一个数量级左右。鲑鱼的k值不像金枪鱼那样变化，金枪鱼在生理上适应于保持体腔温度。这表明大麻哈鱼对体腔温度的调节仅依赖于垂直运动。从它们归巢迁移过程中能量输入与输出的关系可以看出，维持体腔温度有利于它们的成熟和生长。
Vertical movement patterns of five chum salmon (Oncorhynchus keta) during homing migration were examined using archival tags. The standard deviation of the depth and ambient and body cavity temperatures during daytime were larger than those during night-time. Vertical movements through the thermocline with a periodicity of less than 1 h were observed during daytime in addition to the diel vertical movement patterns in the open ocean. During these periods of frequent short-term vertical movements, the difference between the body cavity temperature and ambient temperature was large while the variance of the body cavity temperature was less than that of the ambient temperature. From the results of a random simulation, the variation of the body cavity temperature was shown to decrease due to these periodic high frequency movements in comparison with random vertical movements. The whole-body heat-transfer coefficient k (s(-1)), which was estimated by a heat budget model, was 1.48 x 10(-3). The k of chum salmon was larger than that of bigeye tuna (Thunnus obesus) by about one order of magnitude for the cooling of the body. The k of chum salmon did not change like tuna, which are physiologically adapted to conserve body cavity temperature. This indicates that the regulation of body cavity temperature by chum salmon is dependent on the vertical movements only. The maintenance of the body cavity temperature is concluded to be advantageous for their maturation and growth from the relationship between energy input and output during their homing migration.