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Water Biomes Marshland is covered with grasses reeds sedges and cattails These plants all have their roots in soil covered or saturated with water and its leaves held above waterMarshes may be freshwater or salt Freshwater marshes develop along the shallow edges of lakes and slow-moving rivers forming when ponds and lakes become filled with sediment Salt marshes occur on coastal tidal flats Inland salt marshes occupy the edges of lakes They affect the supply of nutrients the movement of water and the type and deposition of sediment Salt marshes are best developed on the Atlantic coasts of North America and Europe In eastern North America the low marsh is dominated by a single species salt- marsh cordgrass The high marsh consists of a short cordgrass called hay spike grass and glasswort Glasswort is the dominant plant of Pacific Coast salt marshes Freshwater marshes provide nesting and wintering habitats for waterfowl and shorebirds muskrats frogs and many aquatic insects Salt marshes are wintering grounds for snow geese and ducks a nesting habitat for herons and rails and a source of nutrients for estuarine waters Marshes are important in flood control in sustaining high- water tables and as settling basins to reduce pollution downstream Despite their great environmental value marshes are continually being destroyed by drainage and filling Marine Life plants and animals of the sea from the high-tide mark along the shore to the depths of the ocean These organisms fall into three major groups the benthos plants such as kelp and animals such as brittle stars that live on or depend on the bottom the nekton swimming animals such as fishes and whales that move independently of water currents and plankton various small to microscopic organisms that are carried along
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