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Dead Zones that Choke Marine Life Also Found in Freshwater Streams

Hypoxic dead zones, which occur when dissolved oxygen levels in water drop so low that fish and other aquatic animals living there suffocate, are well-documented problems in many coastal waters. Now, a Duke University-led study reveals that they also occur in freshwater urban streams. The study measured dissolved oxygen concentrations, light levels, water chemistry and stream flow in six streams

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