Oligotrophic waters are usually hypoxic.

Name: Oligotrophic waters are usually hypoxic.
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Question

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Oligotrophic waters are nutrient-poor and have low biological productivity, which leads to low levels of organic matter and therefore low levels of oxygen demand. Hypoxia, or low oxygen levels, typically occur in eutrophic or mesotrophic waters that have high biological productivity and nutrient levels.

Oligotrophic Waters Are Usually Hypoxic