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Mummichog, from a Native American word for "swims in crowds," inhabits any range of water. Fortunately, most states have enacted special laws to protect tidal marshes, but diligence is needed to assure that these protective measures are actively enforced. [1] Freshwater marshes primarily consist of sedges, grasses, and emergent plants. Less than three percent of our planets water is freshwater, and less than half of that is available as a liquid; the rest is locked away as ice in polar caps and glaciers. Massive development in South Florida has reduced the amount of water flowing through the Everglades. The World Bank. They are often inundated with floodwater from nearby rivers and streams. They are joined in their aquatic biome by mollusks like snails, some mussels, and clams; worms including parasitic leeches; reptiles like alligators and crocodiles, turtles and tortoises, and water snakes; mammals like the ever-majestic manatee; and frogs. Florida Wetlands: Freshwater Marshes - University of Florida [4] In a freshwater marsh, there are emergent plants, floating plants, floating leaved and submerged. . Marsh vegetation and microorganisms also use excess nutrients for growth that can otherwise pollute surface water such as nitrogen and phosphorus from fertilizer. Getty Images Jay Fleming They are common boundaries between forests and rivers.Herbaceous plants called sedges dominate the tidal freshwater marsh ecosystem. Application ID: 7-3562-00059/00002. The dead zones that regularly develop in and around the Chesapeake Bay and Gulf of Mexico are not only the result of agricultural and industrial runoff but also a lack of marshland to process such runoff.Tidal Salt MarshesTidal salt marshes form a grassy fringe near river mouths and bays and along coastlines protected from the open ocean. Eventually, these tiny stowaways were carried over land to Lake Mendota, and that is where they unleashed a cascade of havoc.