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In 2008, data covering 66,200,000 acres (268,000 km 2) were added to the Wetlands Geodatabase.These included 28,100,000 acres (114,000 km 2) of updated wetland map information, new data for 6,800,000 acres (28,000 km 2) not previously available and 31,300,000 acres (127,000 km 2) of data that were captured in digital format.
Freshwater marsh, Naselle River, Washington Freshwater marsh in Kittery Point, Maine. A freshwater marsh is a non-forested marsh wetland that contains shallow fresh water, and is continuously or frequently flooded. [1] [2] Freshwater marshes primarily consist of sedges, grasses, and emergent plants.
Freshwater ecosystem. Freshwater ecosystems are a subset of Earth's aquatic ecosystems that include the biological communities inhabiting freshwater waterbodies such as lakes, ponds, rivers, streams, springs, bogs, and wetlands. [1] They can be contrasted with marine ecosystems, which have a much higher salinity. Freshwater habitats can be ...
Wetlands exist on every continent, except Antarctica. [3] The water in wetlands is either freshwater, brackish or saltwater. [2] The main types of wetland are defined based on the dominant plants and the source of the water. For example, marshes are wetlands dominated by emergent herbaceous vegetation such as reeds, cattails and sedges.
Today, FWS serves its data via an on-line data discovery "Wetlands Mapper". GIS users can access wetlands data through an online wetland mapping service or download data for various applications (maps, data analyses, and reports). The techniques used by NWI have recently been adopted by the Federal Geographic Data Committee as the federal ...
A freshwater swamp forest is a type of wetland ecosystem characterized by its unique hydrology and vegetation. These forests are typically found in low-lying areas, riverbanks, and floodplains where there is a consistent supply of freshwater. [3]
Lacustrine wetlands- associated with a lake or other body of fresh water; Palustrine wetlands- freshwater wetlands not associated with a river or lake. The primary purpose of this ecological classification system was to establish consistent terms and definitions used in inventory of wetlands and to provide standard measurements for mapping ...
Atchafalaya Basin. The wetlands of Louisiana are water-saturated coastal and swamp regions of southern Louisiana, often called "Bayou".. The Louisiana coastal zone stretches from the border of Texas to the Mississippi line [1] and comprises two wetland-dominated ecosystems, the Deltaic Plain of the Mississippi River (unit 1, 2, and 3) and the closely linked Chenier Plain (unit 4). [2]