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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.
Dissolved Oxygen To survive, fish, crabs, oysters and other aquatic animals must have sufficient levels of dissolved oxygen (DO) in the water. The amount of dissolved oxygen in an estuaryâs water is the major factor that determines the type and abundance of organisms that can live there.ife Science Moduleâ Activity 1 3 Differences in water temperature cause the formation of distinct, non-mixing layers in water, otherwise known as stratification, because the density of water changes with temperature. This stratification leads to chemically and biologically different regions in water.