WetlandProtection (2)

1、Wetland Protection Wetlands are special areas where water and land come together; where plants can have wet feet while still enjoying a breeze. Wetlands are a gathering place for both upland and aquatic wildlife, providing the most productive habitat possible. Benefits include: Healthy Wildlife - We

2、tlands are essential habitat for many types of ducks, geese, swans, herons, shorebirds, frogs, turtles, snakes, mink, otter, beaver, muskrat and other animals. Wetlands also provide spawning and feeding areas for fish, and homes for rare plants and insects. Wetlands are the base of several major foo

3、d webs. In the Great Lakes region, a large percentage of endangered species depend on wetland habitats for their survival. Wetlands include wet meadows and open marshes, as well as forested swamplands. Great Blue Heron Healthy Tourism - In Wisconsin, the tourism industry is worth $13 billion a year.

4、 Many people recreate in Wisconsin primarily because of its natural beauty, waterfront scenery, clean water, abundant wildlife, and many opportunities for waterfowl hunting and fishing. Wetlands contribute significantly to these benefits. Commercial Fishing - Wetlands are necessary to sustain the Gr

5、eat Lakes commercial fishing industry, as many valuable fish species depend on wetlands as spawning and feeding areas. Many of the food plants, insects, and small fish that they feed on also depend on wetlands. If not for the PCB contamination, the Green Bay fishery has been estimated to be worth $5

6、0 million per year. More than a century ago, the Bay of Green Bay was considered one of the top three commercial fisheries in the Great Lakes (along with the west end of Lake Erie and Saginaw Bay) because it was so productive. Hundreds of commercial fishing companies and fish processing houses opera

7、ted on the Bay shores. Much of that productivity was due to the extensive marshlands of southern Green Bay. Scientists consider the Bay to be the largest freshwater estuary in the United States, because the bay water levels fluctuate due to a tide-like seich (pronounced saysh) created by wind pressu

8、res on the bay. Seiches push the Bay water into the marshes, then drain back out, creating a very active and fertile zone of fish habitat. The system is still very productive, but is badly contaminated with toxic PCB chemicals which are picked up and concentrated by fish. If the PCBs and other pollu

9、tants are cleaned up, the commercial fisheries can be fully restored. (see Fox River Watch) Water Filtration - Wetlands help maintain clean, clear water. Healthy wetland plants create dense carpets of roots and stems, which extend deeply into the marsh soils and sediment. These roots and stems are c

10、onstantly pulling in nutrients from the surrounding water and particles become trapped in the root structure, gradually building up rich marsh soils. This activity has a filtering effect. When polluted water passes through a marsh, it is much cleaner when it exits. Modest amounts of excess manure or

11、 fertilizer runoff (phosphorus, nitrogen, potassium) can be filtered out if it first passes through a wetland before it reaches a river and lake. Even some toxic pollutants can become trapped in a marsh matrix and be pulled out of direct circulation (.this may be toxic to marsh wildlife, however.) A

12、t the same time, wetland plants release oxygen into the water, which is necessary for fish survival. Flood Control - Wetlands are very helpful in reducing flash floods. The dense root structure of marsh plants can act as a sponge, soaking up extra rainfall and releasing it only slowly. A watershed (

13、the land area which drains toward a lake or stream) which has many wetlands along its drainage ways will seldom experience flooding. Flows will increase gradually with rain and will not reach the sudden, damaging high levels seen with flash floods. On the other hand, numerous studies have found that

14、 when a watershed is developed with many hard surfaces (streets, driveways, parking lots, roofs, etc.) the runoff is much more rapid. When wetlands are filled, and the streamsides hardened and straightened with rock or concrete, the runoff flows even faster, never having the chance to soak in. Some

15、communities are creating new marshes along drainage ways, to slow the water down and prevent the high social and economic costs of flooding. Other communities have ordinances to protect existing wetlands upstream, to prevent future flooding problems. Wisconsin Losses Unfortunately, Wisconsin has los

16、t more than 50% of its original wetland acres, with some populous counties having lost much more. Development pressures and highway projects continue to chip away at the remaining wetlands. Scientists report that on lower Green Bay more than 90% of its original wetlands are gone. The entire north en

17、d of the City of Green Bay is built on wetland fill, the Highway 43 expansion in the 1970s over the mouth of the Fox River took hundreds of acres more, and the Bayport Project on the west Bay Shore destroyed a 700 acre wetland parcel in the 1960s and 1970s. Only remnants remain, which need careful protection. Historians report that a century ago, Northeast Wisconsin waterfowl migrations would turn the skies black with huge clouds of Tundra