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A swamp is a forested wetland. Swamps are considered to be transition zones because both land and water play a role in creating this environment. Swamps vary in size and are located all around the world. The water of a swamp may be fresh water, brackish water, or seawater. Freshwater swamps form along large rivers or lakes where they are critically dependent upon rainwater and seasonal flooding to maintain natural water level fluctuations. Saltwater swamps are found along tropical and subtropical coastlines. Some swamps have hammocks, or dry-land protrusions, covered by aquatic vegetation, or vegetation that tolerates periodic inundation or soil saturation. The two main types of swamp are "true" or swamp forests and "transitional" or shrub swamps. In the boreal regions of Canada, the word swamp is colloquially used for what is more formally termed a bog, fen, or muskeg. Some of the world's largest swamps are found along major rivers such as the Amazon, the Mississippi, and the Congo.
Wetlands, or simply a wetland, is a distinct ecosystem that is flooded or saturated by water, either permanently or seasonally. Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The primary factor that distinguishes wetlands from terrestrial land forms or water bodies is the characteristic vegetation of aquatic plants, adapted to the unique anoxic hydric soils. Wetlands are considered among the most biologically diverse of all ecosystems, serving as home to a wide range of plant and animal species. Methods for assessing wetland functions, wetland ecological health, and general wetland condition have been developed for many regions of the world. These methods have contributed to wetland conservation partly by raising public awareness of the functions some wetlands provide. Constructed wetlands are designed and built to treat municipal and industrial wastewater as well as to divert stormwater runoff. Constructed wetlands may also play a role in water-sensitive urban design.
Aquatic plants are plants that have adapted to living in aquatic environments. They are also referred to as hydrophytes or macrophytes to distinguish them from algae and other microphytes. A macrophyte is a plant that grows in or near water and is either emergent, submergent, or floating. In lakes and rivers macrophytes provide cover for fish, substrate for aquatic invertebrates, produce oxygen, and act as food for some fish and wildlife.
Pelican Island National Wildlife Refuge is a United States National Wildlife Refuge (NWR), and part of the Everglades Headwaters NWR complex, located just off the western coast of North Hutchinson Island in the Indian River Lagoon east of Sebastian, Florida. The refuge consists of a 3-acre (12,000 m2) island that includes an additional 2.5 acres (10,000 m2) of surrounding water and is located off the east coast of Florida of the Indian River Lagoon. Established by an executive order of President Theodore Roosevelt on March 14, 1903, Pelican Island was the first National wildlife refuge in the United States. It was created to protect egrets and other birds from extinction through plume hunting.
A Ramsar site is a wetland site designated to be of international importance under the Ramsar Convention, also known as "The Convention on Wetlands", an international environmental treaty signed on 2 February 1971 in Ramsar, Iran, under the auspices of UNESCO. It came into force on 21 December 1975, when it was ratified by a sufficient number of nations. It provides for national action and international cooperation regarding the conservation of wetlands, and wise sustainable use of their resources. Ramsar identifies wetlands of international importance, especially those providing waterfowl habitat.
The Charles M. Russell National Wildlife Refuge is a National Wildlife Refuge in the U.S. state of Montana on the Missouri River. The refuge surrounds Fort Peck Reservoir and is 915,814 acres (3,706.17 km2) in size. It is the second-largest National Wildlife Refuge in the lower 48 states of the United States, and the largest in Montana. Created in 1936, it was originally called the Fort Peck Game Range. It was renamed in 1963 after Montana artist Charles M. Russell, a famous painter of the American West. In 1976, the "range" was made a "refuge".
Hewitt Lake National Wildlife Refuge is a 1,360-acre (550 ha) National Wildlife Refuge in the northern region of the U.S. state of Montana. This refuge is a part of the Bowdoin Wetland Management District (WMD), and is unstaffed. The refuge is partly owned by the U.S. Government, while the rest is an easement with local landowners. The refuge is managed from Bowdoin National Wildlife Refuge.
Lake Thibadeau National Wildlife Refuge is a 3,868-acre (1,565 ha) National Wildlife Refuge in the U.S. state of Montana, 15 mi (24 km) northeast of Havre, Montana. This refuge is a part of the Bowdoin Wetland Management District (WMD), and is managed from Bowdoin National Wildlife Refuge. The refuge is an easement refuge almost entirely on privately owned property and consists of grassland, marshes and cropland.
The Sibley Lake National Wildlife Refuge is located in the U.S. state of North Dakota and consists of 1,077 acres (4.35 km2). Sibley Lake is a privately owned easement refuge, managed with by the U.S. Fish and Wildlife Service. The refuge was established to protect habitat for migratory bird species, white-tail deer, and other mammals. The refuge contains a 525-acre (2.12 km2) fresh water marsh that provides excellent migratory bird habitat. Valley City Wetland Management District oversees the refuge, which in turn is a part of the Arrowwood National Wildlife Refuge Complex.
Palustrine wetlands include any inland wetland that contains ocean-derived salts in concentrations of less than 0.5 parts per thousand, and is non-tidal. The word palustrine comes from the Latin word palus or marsh. Wetlands within this category include inland marshes and swamps as well as bogs, fens, pocosins, tundra and floodplains.
Lake Ilo National Wildlife Refuge (NWR) is located in the U.S. state of North Dakota and is managed from Audubon National Wildlife Refuge by the U.S. Fish and Wildlife Service. The refuge consists of Lake Ilo, surrounding wetlands and some upland range, providing habitat for hundreds of species of birds, and numerous fish and mammal species. An average of over 16 inches (40 cm) of precipitation falls annually, supporting a prairie ecosystem.
Summer Lake is a large, shallow, alkali lake in Lake County, Oregon, United States located 5 miles (8 km) south of the small, unincorporated community of Summer Lake, Oregon. At high water it is about 15 miles (24 km) long and 5 miles (8 km) wide, and supports a wide variety of birds and other wildlife in its marshes. The lake was named by explorer John C. Fremont on his expedition into Central Oregon in 1843.
Lake Earl is a lagoon on the extreme northern California coast, just south of the Oregon border. A navigable body of water, it lies partly within Tolowa Dunes State Park and partly within Lake Earl Wildlife Area in Del Norte County, California and the third-most important seabird area on the West Coast after the Farallons and the Channel Islands.
Classification of wetlands has been a problematical task, with the commonly accepted definition of what constitutes a wetland being among the major difficulties. A number of national wetland classifications exist. In the 1970s, the Ramsar Convention on Wetlands of International Importance introduced a first attempt to establish an internationally acceptable wetland classification scheme.
The National Wetlands Inventory (NWI) was established by the United States Fish and Wildlife Service (FWS) to conduct a nationwide inventory of U.S. wetlands to provide biologists and others with information on the distribution and type of wetlands to aid in conservation efforts. To do this, the NWI developed a wetland classification system that is now the official FWS wetland classification system and the Federal standard for wetland classification. The NWI also developed techniques for mapping and recording the inventory findings. The NWI relies on trained image analysts to identify and classify wetlands and deepwater habitats from aerial imagery. NWI started mapping wetlands at a small scale. Eventually, large-scale maps became the standard product delivered by NWI. As computerized mapping and geospatial technology evolved, NWI discontinued production of paper maps in favor of distributing data via online "mapping tools" where information can be viewed and downloaded. 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. The techniques used by NWI have recently been adopted by the Federal Geographic Data Committee as the federal wetland mapping standard. This standard applies to all federal grants involving wetland mapping to insure the data can be added to the Wetlands Layer of the National Spatial Data Infrastructure. NWI also produces national wetlands status and trends reports required by the United States Congress.
Hart Lake is a shallow lake in the Warner Valley of eastern Lake County, Oregon, United States. The lake covers 7,324 acres (29.64 km2) and has the most stable water level within the valley's Warner Lakes chain. The lake is named for the heart-shaped brand used by the pioneer Wilson and Alexander cattle ranch established near the lake. Much of the land around Hart Lake is administered by the Bureau of Land Management (BLM) and the United States Fish and Wildlife Service (FWS). The lake and the surrounding wetlands support a wide variety of birds and other wildlife. Recreational opportunities on and near Hart Lake include hunting, fishing, bird watching, and boating.
Conboy Lake National Wildlife Refuge is located on the east slope of the Cascade Mountains at the base of 12,281-foot (3,743 m) Mount Adams in southern Washington state.
Slade National Wildlife Refuge is a 3,000-acre (12 km2) National Wildlife Refuge in Kidder County, North Dakota. It was established in 1941 when the property was donated by G.T. Slade, a Northern Pacific Railroad executive. It is managed under the Long Lake National Wildlife Refuge. It contains Harker Lake and Upper Harker Lake.
The Summer Lake Wildlife Area is a 29.6-square-mile (77 km2) wildlife refuge located on the northwestern edge of the Great Basin drainage in south-central Oregon. It is administered by the Oregon Department of Fish and Wildlife. The refuge is an important stop for waterfowl traveling along the Pacific Flyway during their spring and fall migrations. The Summer Lake Wildlife Area also provides habitat for shorebirds and other bird species as well as wide variety of mammals and several fish species. The Ana River supplies the water for the refuge wetlands.
Crump Lake is a shallow lake in the Warner Valley of eastern Lake County, Oregon, United States. The lake covers 7,680 acres (31.1 km2). It is the largest of the Warner Lakes system. The lake is named for pioneer rancher Thomas Crump. Crump Lake is owned by the Oregon Department of State Lands. Much of the land around the lake is administered by the Bureau of Land Management and the United States Fish and Wildlife Service. The lake and the surrounding wetlands support a wide variety of birds and other wildlife. Recreational opportunities on or near Crump Lake include fishing, bird watching, and camping.
References
- Cowardin, L. M.; Carter, V.; Golet, F. C.; LaRoe, E. T. "Classification of wetlands and deepwater habitats of the United States". U.S. Department of the Interior, Fish and Wildlife Service. Archived from the original on 21 January 2014. Retrieved 26 April 2015.
- Notes
- ↑ Cowardin, Lewis M.; Golet, Francis C. (1995-06-01). "US Fish and Wildlife Service 1979 wetland classification: A review". Vegetatio. 118 (1–2): 139–152. doi:10.1007/BF00045196. ISSN 0042-3106. S2CID 6422120.
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