Some visitors might enjoy riding bicycles through Shark Valley. Others may want to move slowly through shallow waters where they can see insects and wildlife up-close. Park guides also lead visitors on tram rides.
FAITH LAPIDUS: Experts say changes to the Everglades are threatening several different kinds of wildlife. They say the threats are a result of actions the United States government began more than fifty years ago, and settlers began even earlier.
The National Park Service says that early colonial settlers and land developers believed the Everglades had little value. The settlers had plans to remove water from the area. In the eighteen eighties, developers began digging canals to reduce water levels.
At the time, they did not understand the complexity of the Everglades’ ecosystem. As a result, they were not prepared for all the work and caused environmental problems. The ecosystem, however, was able to survive.
STEVE EMBER: Even larger efforts to drain the wetlands continued between nineteen oh five and nineteen ten. Farms were built on large pieces of land. This led to increased development, with more people moving to the Everglades and also more visitors.
More changes came in nineteen forty-eight. At that time, Congress approved the Central and South Florida Project. As part of the plan, the Army Corps of Engineers built roads, canals and water-control systems throughout South Florida.
The aim of the project was to provide water and flood protection for developed areas and agriculture. Workers built a huge system of waterways and pumping stations to control the overflow of Lake Okeechobee, north of the Everglades.
FAITH LAPIDUS: Today, fifty percent of South Florida’s early wetland areas no longer exist. Populations of wading birds have been reduced by ninety percent. Whole populations of animals are in danger of disappearing. The endangered creatures include the manatee, the Miami blackhead snake, the wood stork and the Florida panther.
In recent years, environmental experts have learned about the damage to the Everglades. They say the balance of nature there has been destroyed.
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STEVE EMBER: About ten years ago, Congress approved a plan to restore and improve the Everglades. Federal, state and other organizations are partners in the Comprehensive Everglades Restoration Plan. The project is expected to cost about twelve billion five hundred million dollars.
Early in two thousand ten, work began on the Picayune Strand Restoration Project. A goal of the project is to re-establish natural water flow across more than twenty-two thousand hectares of land. Workers removed water from that area in the early nineteen sixties. At the time, the goal was to develop the land of Picayune Strand for homes. However, the development harmed healthy wetlands.
FAITH LAPIDUS: Project organizers hope to re-create wetlands in Picayune Strand and nearby lands by redirecting the flow of water in that area. At the same time, they are seeking to re-establish natural water flow to the Ten Thousand Islands National Wildlife refuge.
Goals of the project are to make major additions to the size and improve wetland ecosystems in nearby lands. The area includes the Collier Seminole State Park and the Florida Panther National Wildlife Refuge. If the goals are met, the project should help threatened and endangered animals.
STEVE EMBER: For example, the population of one big cat has been falling in recent years. Panthers once existed in much greater numbers. But too much hunting, loss of panther homelands and vehicle strikes have reduced their population. Fewer than one hundred of the animals now live in Florida.
FAITH LAPIDUS: Wildlife experts are working to increase the number of panthers and other animals at risk. At the same time, biologists are attempting to remove Burmese pythons. Officials believe there are as many as one hundred fifty thousand of these large snakes in the Everglades.
However, the snakes are a foreign species, native to Southeast Asia. Owners of pythons left their unwanted snakes in the Everglades years ago. Biologists say adult pythons are able to eat small deer and bobcats. When pythons are found in the Everglades, they are often killed.
Scientists are now experimenting with other ways to remove the snakes, including use of traps and offering payments to hunters.
STEVE EMBER: The future of the Everglades is not clear. However, efforts to protect the area are continuing so people from all over the world may continue visiting this biological treasure.
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FAITH LAPIDUS: This SCIENCE IN THE NEWS was written by Brianna Blake and Jerilyn Watson. Our producer was June Simms. I’m Faith Lapidus.
STEVE EMBER: And I’m Steve Ember. Read and listen to our programs at voaspecialenglish.com. And you can see videos about Everglades National Park and projects to protect and improve the park at
www.evergladesplan.org. Join us again next week for more news about science in Special English on the Voice of America.