From the coast to the deep sea, changing oxygen levels affect marine life in different ways

By Marco Fusi, Senior Lecturer in Marine Biology, Newcastle University

Earth’s atmosphere maintains a constant level of oxygen, whether it is a wintry, rainy day or hot summer. Across the ocean, oxygen concentrations vary enormously between different places and over time. Sometimes oxygen levels change within the course of a day, while in some deep parts of the ocean, oxygen concentrations remain constant. In certain places, there’s no oxygen at all but life still thrives.

Marine species respond to ocean deoxygenation (the decrease of oxygen levels in seawater) differently depending on where they live. With seas under…

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