作者
Hans-Otto Pörtner, Felix Christopher Mark, Christian Bock
发表日期
2004/8/12
期刊
Respiratory physiology & neurobiology
卷号
141
期号
3
页码范围
243-260
出版商
Elsevier
简介
In various phyla of marine invertebrates limited capacities of both ventilatory and circulatory performance were found to set the borders of the thermal tolerance window with limitations in aerobic scope and onset of hypoxia as a first line of sensitivity to both cold and warm temperature extremes. The hypothesis of oxygen limited thermal tolerance has recently been investigated in fish using a combination of non-invasive nuclear magnetic resonance (NMR) methodology with invasive techniques. In contrast to observations in marine invertebrates arterial oxygen tensions in fish were independent of temperature, while venous oxygen tensions displayed a thermal optimum. As the fish heart relies on venous oxygen supply, limited cardio-circulatory capacity is concluded to set the first level of thermal intolerance in fish. Nonetheless, maximized ventilatory capacity is seen to support circulation in maintaining the width of …
引用总数
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Oxygen limited thermal tolerance in fish?: Answers obtained by nuclear magnetic resonance techniques
HO Pörtner, FC Mark, C Bock - Respiratory physiology & neurobiology, 2004