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I copied the Freshwater Marsh page.

A freshwater marsh is a non-tidal, non-forested marsh that contains fresh water, and is continuously or frequently flooded. Freshwater marshes primarily consist of sedges, grasses and emergent plants. Freshwater marshes are usually found near the mouths of rivers, along lakes and are present in areas with low drainage like abandoned oxbow lakes. It is the counterpart to the salt marsh, an upper coastal intertidal zone of bio-habitat which is regularly flushed with sea water. Freshwater marshes are non-tidal biomes containing little or no peat (unlike bogs and fens, both a kind of mire and mires consisting heavily of moist, biologically active peat).

Vegetation
Freshwater marshes are highly productive and therefore can support a large biodiversity of vegetation. Vegetation is a key component in determining the structure of a freshwater marsh. The primary plant in freshwater marshes are emergent plants. Emergent plants are plants with soft stems and are highly adapted to live in saturated soils. Freshwater marshes have a lengthy growing season and contain high nutrient levels in the water and substrate, which contribute to an overall high net primary production. Some of the most common plants in these areas are cattails, water lilies, arrowheads, and rushes.

Animals
Many types of animals use freshwater marshes for habitat at some point in their life cycles. Birds, amphibians, reptiles, fish and macro-invertebrates can be found within freshwater marshes. Birds use freshwater marshes for nesting. Common species of birds found in a freshwater marsh include ducks, geese, swans, songbirds, swallows, coots, and black ducks. Although shallow marshes do not tend to support many fish, they are used as a nursery for babies. The deeper ones are home to many species, including large fish such as the northern pike and carp.

Hydrology
Freshwater marshes are dynamic ecosystems. Aspects of the water like depth, velocity, oxygen concentration, and temperature change frequently. Marshes can be classified based on their hydrology. Marshes can be flooded permanently, intermittently, temporarily, seasonally, and semi-permanently. Groundwater reserves, water moving across the the surface and precipitation are the three main sources of water in marshes.

Functions and Services
Wetlands have many services and functions that benefit the Earth. With increasing amounts of carbon in the atmosphere becoming a large issue, marshes can rapidly remove carbon from the atmosphere and store it in their biomass or the ground. Many of the wide variety of species that freshwater marshes can support, provide services to humans. Many different types of food are produced within a freshwater marsh like fruits, different varieties of rice, vegetables like taro and fish. Freshwater marshes can also provide clothing in the form of pelts and materials for building such as reeds. Freshwater marshes also provide recreational services like fishing, water fowl hunting and trapping. Another important function of marshes is flood mitigation. Marshes can slow down the rate at which water is travelling and create a buffer zone to stop flooding.

Conservation and Restoration
The Florida Everglades represent the largest contiguous freshwater marsh in the entire world. This immense marsh covers 4200 sqmi and is located in the southern tip of Florida. The remaining parts of the Everglades are grasses, sedges and other emergent hydrophytes.