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首页> 外文期刊>Marine biology >The effect of acute hypoxia on swimming stamina at optimal swimming speed in flathead grey mullet Mugil cephalus
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The effect of acute hypoxia on swimming stamina at optimal swimming speed in flathead grey mullet Mugil cephalus

机译：急性缺氧对平头Mu鱼Mugil cephalus最佳游泳速度下游泳耐力的影响

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Flathead grey mullets Mugil cephalus are commonly found in Mediterranean lagoons, which are regularly subject to high environmental variations. Oxygen is one of the factors that shows extremely high variation. The objective of this study was to test the effects of acute hypoxia exposure at two experimental temperatures (i.e. 20 and 30℃) on the stamina (time to fatigue) in M. cephalus swimming at the minimal cost of transport (i.e. optimal swimming speed; U_(opt)). At each temperature, a relationship was established between swimming speed and oxygen consumption (MO_2). This allowed estimation of U_(opt) at 45 cm s~(-1) (～1.12 Body Lengths~(-1)). Independent of temperature, stamina at U_(opt) was significantly reduced in severe hypoxia, i.e. at 15% of air saturation (AS). In these conditions, oxygen supply appears therefore to be insufficient to maintain swimming, even at the low speed tested here. After the stamina test, MO_2 measured in fish tested at 15% AS was significantly higher than that measured after the test in normoxia. Therefore, we suggest that in hypoxia, fish used anaerobic metabolism to supplement swimming at U_(opt), leading to an oxygen debt. Since flathead grey mullet is a hypoxia-tolerant species, it is possible that hypoxic conditions less severe than those tested here may reduce stamina at low speed in less tolerant species. In addition, we suggest that testing stamina at these speeds may be relevant in order to understand the effect of hypoxia on behavioural activities carried out at low speed, such as food searching.
机译：扁头灰鱼Mugil cephalus通常在地中海泻湖中发现，它们经常受到高度环境变化的影响。氧气是显示极高变化的因素之一。这项研究的目的是在最小的运输成本（即最佳游泳速度；即最佳游泳速度）下，测试在两个实验温度（即20和30℃）下急性缺氧对头颅分枝杆菌游泳的耐力（疲劳时间）的影响。 U_（opt））。在每个温度下，游泳速度和氧气消耗（MO_2）之间建立了关系。这样就可以估计45 cm s〜（-1）（〜1.12体长〜（-1））的U_（opt）。与温度无关，严重缺氧时，即空气饱和度（AS）的15％时，U_（opt）的耐力显着降低。因此，在这些条件下，即使在此处测试的低速下，氧气供应仍不足以维持游泳。耐力测试后，在15％AS下测试的鱼中测得的MO_2显着高于常氧测试后测得的MO_2。因此，我们建议在缺氧状态下，鱼类使用无氧代谢来补充U_（opt）游泳，从而导致氧负担。由于flat鱼是耐缺氧的物种，因此低氧条件比此处测试的条件低，可能会降低耐性较低的物种的低速耐力。另外，我们建议以这些速度测试耐力可能是有意义的，以便了解缺氧对低速进行的行为活动（例如食物搜索）的影响。

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