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'Marine ecosystems' are part of the earth's aquatic ecosystem. They include oceans, estuaries, salt marshes, lagoons, some tropical ecosystems, such as mangrove forests and coral reefs, rocky, subtidal ecosystems, and shores. The main difference between this and other aquatic ecosystems is its salt content larger than that of fresh water.
See also marine biology.

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★ http://www.epa.gov/bioiweb1/aquatic/marine.html