Oxygen supply capacity breathes new life into the critical oxygen partial pressure (Pcrit).
Oxygen supply capacity breathes new life into the critical oxygen partial pressure (Pcrit).
复制标题
供氧能力为临界氧分压 (Pcrit) 注入了新的活力。
DOI：
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发表时间：
2021
影响因子：
2.8
通讯作者：
Christina J Welsh
中科院分区：
文献类型：
--
作者：
B. A. Seibel;A. Andres;Matthew A. Birk;A. L. Burns;C. Shaw;A. Timpe;Christina J Welsh
临界氧分压（Pcrit）通常被定义为动物的代谢率（MR）低于不可持续的临界点，被广泛解释为缺氧耐受性的衡量标准。这里，Pcrit被定义为生理供氧（α 0）达到其最大容量（α；µmol O2 g-1h-1kPa-1）时的PO2。α是一个物种和温度特异性常数，描述最大代谢率（MMR= PO2 * α）的氧依赖性，或等价地，Pcrit的代谢率依赖性（Pcrit=MR/α）。我们描述了α-方法，其中MR在氧气下降时进行监测，并在每个测量周期内除以相应的PO2以提供并发氧气供应（α 0 =MR/PO2）。最高的α 0值（或者更保守地说，三个最高值的平均值）被指定为α。无论之前或随后的代谢活动如何，任何MR在Pcrit时都达到相同的α值。α-方法相对于Pcrit测定和非线性分析有几个优点，包括：1)更少的歧义和更高的准确性；2)呼吸测量方法和分析的限制更少；3)更强的预测能力和对生态和生理的洞察力。在这里评估的物种中，α值与MR相关，但与Pcrit无关。Pcrit不是缺氧耐受性的指标，而是α的反映，α的进化支持在当前温度和氧气水平下的最大能量需求和有氧范围。
The critical oxygen partial pressure (Pcrit), typically defined as that below which an animal's metabolic rate (MR) is unsustainable, is widely interpreted as a measure of hypoxia tolerance. Here, Pcrit is defined as the PO2 at which physiological oxygen supply (α 0 ) reaches its maximum capacity (α; µmol O2 g-1h-1kPa-1). The α is a species- and temperature-specific constant describing the oxygen dependency of the maximum metabolic rate (MMR= PO2 * α) or, equivalently, the metabolic rate-dependence of Pcrit (Pcrit=MR/α). We describe the α-method, in which the MR is monitored as oxygen declines and, for each measurement period, is divided by the corresponding PO2 to provide the concurrent oxygen supply (α 0 =MR/PO2). The highest α 0 value (or, more conservatively, the mean of the three highest values) is designated as α The same value of α is reached at Pcrit for any MR regardless of previous or subsequent metabolic activity. The metabolic rate needn't be constant (regulated), standardized, nor exhibit a clear-breakpoint at Pcrit for accurate determination of α The α-method has several advantages over Pcrit determination and non-linear analyses, including: 1) less ambiguity and greater accuracy, 2) fewer constraints in respirometry methodology and analysis, and 3) greater predictive power and ecological and physiological insight. Across the species evaluated here, α values are correlated with MR, but not Pcrit Rather than an index of hypoxia tolerance, Pcrit is a reflection of α, which evolves to support maximum energy demands and aerobic scope at the prevailing temperature and oxygen level.
影响因子：
13.6
作者：
K. Wishner;B. Seibel;C. Roman;C. Deutsch;Dawn M. Outram;C. Shaw;Matthew A. Birk;K. Mislan;
通讯作者：
K. Wishner;B. Seibel;C. Roman;C. Deutsch;Dawn M. Outram;C. Shaw;Matthew A. Birk;K. Mislan;
影响因子：
13.6
作者：
Howard, Evan M.;Penn, Justin L.;Deutsch, Curtis
通讯作者：
Deutsch, Curtis
海洋无脊椎动物幼虫的视觉对氧气的可用性高度敏感
DOI：
10.1242/jeb.200899
发表时间：
2019
期刊：
The Journal of Experimental Biology
影响因子：
--
作者：
McCormick, Lillian R.;Levin, Lisa A.;Oesch, Nicholas W.
通讯作者：
Oesch, Nicholas W.