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The oxygen dissolved in lakes, rivers, and oceans is crucial for the organisms and creatures living in it. As the amount of dissolved oxygen drops below normal levels in water bodies, the water quality is harmed and creatures begin to die off.Indeed, a water body can die, a process called eutrophication.he oxygen dissolved in lakes, rivers, and oceans is crucial for the organisms and creatures living in it. As the amount of dissolved oxygen drops below normal levels in water bodies, the water quality is harmed and creatures begin to die off.
Oxygen enters estuarine waters through two natural processes: (1) diffusion from the atmosphere and (2) photosynthesis by aquatic plants. The mixing of surface waters by wind and waves increases the rate at which oxygen from the air can be dissolved or absorbed into the water. The solubility of oxygen, or its ability to dissolve in water, decreases as water temperature and salinity increase. Plants and algae produce oxygen during the day as a by-product of photosynthesis. Microbes reduce DO levels in estuaries when they decompose organic matter using oxygen.