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Microaerophilic ciliates which live in the chemocline of marine sediments and of microbial mats orient themselves in O 2 -gradients where they show a more or less distinct and species-specific preference for an oxygen tension somewhere within the range of 1 to 20% atmospheric saturation. In sufficiently steep O 2 -gradients some of the species maintain their position within ± 200 μm...
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