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freshwater ecosystems
lakes and ponds
fresh water wetlands
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swamps
marshes
marine ecosystems
coastal wetlands
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estuary
salt marshes
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rocky and sandy shores
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artic ecosystem
antarctic ecosystem
Salt marshes develop in estuaires .The salt marshes support homes for clams,fish and aquatic birds.It also acts as a nursery for clams ,shrimp and fishes.Like other wetlands it absorbs pollutants and protect inland.