细纹狮子鱼（Zoarces viviparus）的热生理学

Thermal physiology of the common eelpout (Zoarces viviparus).

作者信息

Zakhartsev M V, De Wachter B, Sartoris F J, Pörtner H O, Blust R

机构信息

Department of Biology, University of Antwerp, University of Antwerp-RUCA, Groenenborgerlaan 171, 2020 Antwerp, Belgium.

出版信息

J Comp Physiol B. 2003 Jul;173(5):365-78. doi: 10.1007/s00360-003-0342-z. Epub 2003 May 28.

DOI:10.1007/s00360-003-0342-z

PMID:12774171

Abstract

We investigated the temperature dependence of some physiological parameters of common eelpout (Zoarces viviparus) from different locations (North Sea, Baltic Sea and Norwegian Sea) on acclimation temperature (3 degrees C and 12 degrees C) and acute temperature variation. The lethal limit of 12 degrees C-acclimated eelpout was determined as the critical thermal maximum [loss of equilibrium (LE) and onset of muscular spasms (OS)] and it was found to be 26.6 degrees C for LE and 28.8 degrees C for OS for all populations. However, these parameters do not have any relevant ecological interpretation. We therefore investigated the effect of gradually increased water temperature on standard metabolic rate (measured as resting oxygen consumption Mo2) and critical oxygen concentration ([O2]c) of eelpouts. Acclimation to low temperature (3 degrees C) resulted in partial compensation of Mo2, paralleled by a decrease of activation energy for Mo2 (from 82 kJ mol(-1) at 12 degrees C to about 50 kJ mol(-1) at 3 degrees C) in North Sea and Baltic Sea eelpouts. At the same time, Norwegian eelpout showed no acclimation of oxygen demand to warm temperature (12 degrees C) at all. The scope for eelpout aerobic metabolism shrank considerably with increased acclimation temperature, as [O2]c approached water oxygen concentrations. At 22.5+/-1 degrees C the [O2]c reached air saturation, which is equivalent to the upper critical temperature (TcII) and at this temperature the aerobic scope for the metabolism completely disappeared. In line with previous insight, the comparative analysis of the temperature dependence of Mo2 of Z. viviparus from different populations suggests that a pejus (sub-critical) temperature for this species is about 13-15 degrees C. In conclusion, the capacity to adjust aerobic metabolism relates to thermal tolerance and the bio-geographical distribution of the species. Global warming would thus be likely to cause a shift in the distribution of this species to the North.

摘要

我们研究了来自不同地点（北海、波罗的海和挪威海）的普通绵鳚（Zoarces viviparus）的一些生理参数对驯化温度（3摄氏度和12摄氏度）和急性温度变化的温度依赖性。将12摄氏度驯化的绵鳚的致死极限确定为临界热最大值[平衡丧失（LE）和肌肉痉挛发作（OS）]，发现所有种群的LE为26.6摄氏度，OS为28.8摄氏度。然而，这些参数没有任何相关的生态学解释。因此，我们研究了水温逐渐升高对绵鳚标准代谢率（以静息耗氧量Mo2衡量）和临界氧浓度（[O2]c）的影响。北海和波罗的海的绵鳚在低温（3摄氏度）下驯化导致Mo2部分补偿，同时Mo2的活化能降低（从12摄氏度时的82 kJ mol-1降至3摄氏度时的约50 kJ mol-1）。与此同时，挪威绵鳚对温暖温度（12摄氏度）的需氧量完全没有驯化。随着驯化温度升高，绵鳚有氧代谢的范围大幅缩小，因为[O2]c接近水中氧浓度。在22.5±1摄氏度时，[O2]c达到空气饱和度，这相当于上临界温度（TcII），在此温度下，代谢的有氧范围完全消失。与之前的认识一致，对不同种群的Zoarces viviparus的Mo2温度依赖性的比较分析表明，该物种的劣化（亚临界）温度约为13 - 15摄氏度。总之，调节有氧代谢的能力与该物种的热耐受性和生物地理分布有关。因此，全球变暖可能会导致该物种的分布向北转移。