Oxygen limited thermal tolerance in fish?: Answers obtained by nuclear magnetic resonance techniques

摘要: In various phyla of marine invertebrates limited capacities both ventilatory and circulatory performance were found to set the borders thermal tolerance window with limitations in aerobic scope onset hypoxia as a first line sensitivity cold warm temperature extremes. The hypothesis oxygen has recently been investigated fish using combination non-invasive nuclear magnetic resonance (NMR) methodology invasive techniques. contrast observations arterial tensions independent temperature, while venous displayed optimum. As heart relies on supply, cardio-circulatory capacity is concluded level intolerance fish. Nonetheless, maximized seen support circulation maintaining width windows. interdependent setting low high limits interpreted result from trade-offs between optimized tissue functional baseline demand energy turnover co-determined by adjustment mitochondrial densities properties species-specific range. At extremes, systemic will elicit metabolic depression, thereby widening transiently sustained especially those species preadapted hypoxic environments.