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The case for reporting PO (partial pressure of oxygen), in addition to DO (dissolved oxygen), in studies of aquatic systems.

08:00 EDT 16th May 2019 | BioPortfolio

Summary of "The case for reporting PO (partial pressure of oxygen), in addition to DO (dissolved oxygen), in studies of aquatic systems."

In this essay, we question the sole use of mg/L (ppm) and the term DO (dissolved oxygen) when referring to oxygen supply in water, and discuss reasons for also reporting the partial pressure of oxygen (PO). Oxygen moves from water into organisms by diffusion only, and the rate and direction of diffusion is solely dependent upon partial pressure gradients, not concentration gradients. However, the amount of oxygen moved into an organism is both a function of DO and PO. Therefore, to have physiological and ecological relevance, the presence of oxygen in water, when reported as DO, should also include PO.

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Name: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
ISSN: 1531-4332
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