The most widespread injurious effect of rising ocean temperatures are oxygen-poor, or “hypoxic,” marine zones, because warm water holds far less oxygen. A 2008 study warned that the spread of hypoxic waters that suffocate marine life is consistent with climate models forecasting what would happen as greenhouse gases accumulate in the atmosphere. The hypoxic zones are inhospitable to most fish and marine life, and allow certain predators to dominate the food chain. Humboldt squid, for instance, which can grow 6 feet long, appear to be taking advantage of their tolerance for oxygen-poor waters to devour local fish.
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