Does the Ability to Metabolically Downregulate Alter the Hypoxia Tolerance of Fishes?: A Comparative Study Using Cunner (T. adspersus) and Greenland Cod (G. ogac)
Does the Ability to Metabolically Downregulate Alter the Hypoxia Tolerance of Fishes?: A Comparative Study Using Cunner (T. adspersus) and Greenland Cod (G. ogac)
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DOI：
10.1002/jez.520
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发表时间：
2009-04-01
影响因子：
2.8
通讯作者：
Gamperl, A. Kurt
中科院分区：
文献类型：
--
作者：
Corkum, Chris P.;Gamperl, A. Kurt
在这项研究中，在两个温度（类似于 1 和 8 摄氏度）下测量了库纳鱼（一种能够代谢抑制的温带濑鱼物种）对分级缺氧（水 O-2 饱和度 100-10%）的代谢反应和耐受性，并与格陵兰鳕鱼 (Gadus ogac) 进行了比较。与格陵兰鳕鱼（64.0 +/- 4.3 和 92.5 +/- 6.3 mg）相比，Cunner 在 1（21.2 +/- 2.4 mg O-2 kg(-0.83) hr(-1)）和 8 摄氏度（31.6 +/- 1.5 mg O-2 kg(-0.83) hr(-1)）的耗氧量 (MO2) 值显着降低在常氧下测量时，分别为 O-2 kg(-0.133) hr(-1))。此外，该物种比格陵兰鳕鱼具有更强的耐缺氧能力，这一点可以从其耐受较低水 O-2 饱和度的能力及其显着较低的临界氧饱和度 (S-crit) 值（1 摄氏度和 8 摄氏度时分别为 16.9 和 21.4% 对比 40.4 和 54.8% 水 O-2 饱和度）来证明。令人惊讶的是，cunner MO2 的常氧 Q(10) 值 (1.77) 并不表示 1 摄氏度时的代谢低下状态（基于之前对该物种的实验）。然而，当水 O-2 饱和度降低时，1 摄氏度时，它们的 MO2 立即降低到新的稳定状态（比正常含氧量低 44%），这导致在 80% 至 20% 饱和度之间的氧水平下 Q(10) 接近 4.5。这项研究提供了第一个数据，表明能够代谢抑制的鱼类具有增强的缺氧耐受性，并且狡猾的鱼在低温下的低代谢状态是可塑的，并且依赖于其他环境参数。 J.Exp。动物园。 311A:231-239, 2009。(C) 2009 Wiley-Liss, Inc.
In this study, the metabolic response and tolerance of cunner (a temperate wrasse species capable of metabolic depression) to graded hypoxia (water O-2 saturation 100-10%) was measured at two temperatures (similar to 1 and 8 degrees C), and compared with that of the Greenland cod (Gadus ogac). Cunner had significantly lower oxygen consumption (MO2) Values at both 1 (21.2 +/- 2.4 mg O-2 kg(-0.83) hr(-1)) and 8 degrees C (31.6 +/- 1.5 mg O-2 kg(-0.83) hr(-1)) as compared with the Greenland cod (64.0 +/- 4.3 and 92.5 +/- 6.3 mg O-2 kg(-0.133) hr(-1), respectively) when measured under normoxia. In addition, this species was considerably more hypoxia tolerant than Greenland cod, as evidenced by an ability to tolerate lower water O-2 saturations and their significantly lower critical oxygen saturation (S-crit) values (16.9 and 21.4% vs. 40.4 and 54.8% water O-2 saturation at 1 and 8 degrees C, respectively). Surprisingly, the normoxic Q(10) value for cunner MO2 (1.77) was not indicative of a hypometabolic state at 1 degrees C (based on previous experiments on this species). However, 1 degrees C cunner immediately decreased their MO2 to a new steady state (44% below normoxic levels) when water O-2 saturation was lowered, and this resulted in a Q(10) of similar to 4.5 at oxygen levels between 80 and 20% saturation. This study provides the first data to suggest that fish capable of metabolic depression have an enhanced hypoxia tolerance, and that the cunner's hypometabolic state at cold temperatures is plastic and dependent on other environmental parameters. J. Exp. Zool. 311A:231-239, 2009. (C) 2009 Wiley-Liss, Inc.