Everglades

Everglades. The Everglades is a vast, slow-moving river of grass that encompasses a unique and fragile ecosystem in southern Florida. Often described as a subtropical wilderness, it is the largest tropical wilderness of any kind in the United States and has been designated an International Biosphere Reserve, a World Heritage Site, and a Wetland of International Importance. The system's health is intrinsically linked to the flow of freshwater from Lake Okeechobee southward across a limestone shelf to the estuaries of Florida Bay and the Gulf of Mexico.

Geography and ecology

The region spans from the Kissimmee River basin near Orlando down through Lake Okeechobee and across the southern peninsula. The defining feature is the expansive sawgrass marsh, interspersed with wet prairies, tropical hardwood hammocks, and elevated pine rockland communities. A complex network of sloughs, including the principal channel known as Shark River Slough, facilitates the vital southward water flow. The southern terminus of the system includes the coastal mangrove forests and seagrass beds of Florida Bay, which are ecologically connected to the adjacent Florida Keys and the reefs of the John Pennekamp Coral Reef State Park.

History and human impact

For thousands of years, the region was inhabited by Native American tribes, most notably the Miccosukee and the Seminole. Significant modern alteration began in the late 19th and early 20th centuries with ambitious drainage projects promoted by figures like Napoleon Bonaparte Broward, aiming to convert wetlands for agriculture and development. The Army Corps of Engineers later constructed an extensive system of canals, levees, and water control structures, such as the Tamiami Trail, which severely disrupted natural hydrology. This engineering, coupled with rapid urban growth of cities like Miami and Fort Lauderdale, led to dramatic habitat loss, pollution from agricultural runoff, and a decline in freshwater flows.

Conservation and restoration

Conservation efforts were championed by early advocates like Marjory Stoneman Douglas, whose book *The Everglades: River of Grass* transformed public perception. This led to the establishment of Everglades National Park in 1947, spearheaded by President Harry S. Truman. The later creation of the Big Cypress National Preserve and the Arthur R. Marshall Loxahatchee National Wildlife Refuge provided further protection. The monumental federal and state Comprehensive Everglades Restoration Plan (CERP), authorized by the Water Resources Development Act of 2000, is a multi-decade initiative to store and redirect water to mimic natural flows, involving projects like the C-44 Reservoir and modifications to the Tamiami Trail.

Flora and fauna

The ecosystem supports a remarkable array of species, many of which are endangered. Iconic fauna includes the American alligator, the critically endangered Florida panther, and the West Indian manatee. The region is a crucial habitat for wading birds like the roseate spoonbill, the wood stork, and the great blue heron. Noteworthy flora ranges from the ubiquitous sawgrass and spiky saw palmetto to rare orchids found in hardwood hammocks and the ancient cypress trees of Big Cypress Swamp. Invasive species such as the Burmese python and the melaleuca tree pose severe ongoing threats to native biodiversity.

Hydrology and climate

The system is a rain-fed, low-gradient watershed where the seasonal interplay of wet and dry periods dictates ecological cycles. The climate is subtropical, with a distinct wet season from May to October, influenced by the North Atlantic tropical cyclone season, which can include hurricanes like Hurricane Andrew. The primary water source is rainfall, historically filtered through the Kissimmee River into Lake Okeechobee and then slowly southward. Altered drainage now forces large volumes of water to be discharged to coastal estuaries like the Caloosahatchee River and St. Lucie Estuary, causing ecological damage, while the core marshes suffer from dehydration and saltwater intrusion from rising sea levels.

Category:Everglades Category:National parks in Florida Category:Ramsar sites in the United States Category:World Heritage Sites in the United States