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Nutrient and sediment pollution are the main causes of the Chesapeake Bay’s poor water clarity. Nutrients fuel the growth of water-clouding algae blooms, while particles of sediment can float in the water. Weather also plays a role in water clarity: rain storms wash dirt and pollutants into the Bay, muddying the water.
Underwater grasses are a critical part of the Chesapeake Bay ecosystem. Without them, underwater creatures such as fish and blue crabs do not have the shelter they need to survive, and migratory waterfowl do not have enough food to eat.
Another important role of underwater grasses is to hold bottom sediments in place. If they are gone, waves can stir up bottom sediments and make the water cloudy. This can affect grass beds growing in other areas, because they need clear water to survive.