Colonial expeditions in the 1500s found Native Americans living in the Everglades; in the late 1830s the Everglades was the scene of military operations against the Seminole. Large tracts of land were drained in the late 19th and early 20th cent., when the area was considered rich in agricultural potential, but only lands immediately bordering Lake Okeechobee were farmed. Winter vegetables and sugarcane are now the main crops; some cattle are raised. After great fires in 1939 (abetted by overdrainage), the first thorough studies of the Everglades concluded that most of the southern part was unfit for cultivation.
A ring dike had been constructed around Lake Okeechobee in the 1920s to prevent hurricanes from blowing water out of the lake, and massive additional flood control projects were undertaken following 1947 hurricanes. These, land development, and roadbuilding, especially the Tamiami Trail (U.S. 41), disrupted the shallow, 60-mile (100-km) wide "River of Grass" that had flowed across the Everglades, altering seasonal rhythms, channeling water to the Gulf of Mexico so as to create shortages that have damaged plant and animal life, and causing increased salinity in Florida Bay to the south.
In 1994, Florida—and in 1996 the federal government—launched long-term reclamation projects, aimed at removing levees, reflooding drained swampland, and otherwise "replumbing" the Everglades. Legislation enabling the multibillion-dollar project, whose cost would be split between the state and the U.S. government, was passed by Congress in 2000. At the southwestern end of Florida is Everglades National Park and Expansion, (1,508,580 acres/610,761 hectares), est. 1947. Big Cypress National Preserve and Addition (est. 1974) adjoins it to the north. See National Parks and Monuments (table).
See M. S. Douglas, The Everglades (1947, repr. 1988); C. S. Rom, Everglades (1989); M. Grunwald, The Swamp (2006).
Subtropical saw-grass marsh region, southern Florida, U.S. Covering about 4,000 sq mi (10,000 sq km), the area has water moving slowly through it from the lip of Lake Okeechobee to mangrove swamps bordering the Gulf of Mexico and Florida Bay. Everglades National Park, established in 1934, encompasses the southwestern portion of the marsh, covering 2,354 sq mi (6,097 sq km). The largest subtropical wilderness left in the continental U.S., it has a mild climate, which provides an environment for myriad birds, alligators, snakes, and turtles. A large portion of the glades has been reclaimed by drainage canals, altering the habitats of many species.
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The Everglades are a subtropical wetland located in the southern portion of the U.S. state of Florida, comprising the southern half of a large watershed. The system begins near Orlando with the Kissimmee River, which discharges into the vast but shallow Lake Okeechobee. Water leaving the lake in the wet season forms a slow-moving river wide and over long, flowing southward across a limestone shelf to Florida Bay at the southern end of the state. The ever-changing Everglades are shaped by water and fire, with frequent flooding in the wet season and drought in the dry season. Environmental activist Marjory Stoneman Douglas popularized the term "River of Grass" to describe the sawgrass marshes, part of a complex system of interdependent ecosystems that include cypress swamps, the estuarine mangrove forests of the Ten Thousand Islands, tropical hardwood hammocks, pine rockland, and the marine environment of Florida Bay.
Human habitation in the southern portion of the Florida peninsula dates to 15,000 years ago, when it was an arid landscape. When regular flooding from Lake Okeechobee began roughly 6,500 years ago, two major tribes lived in and around Everglades ecosystems: the Calusa and the Tequesta. After coming into contact with the Spanish in the late 16th century, both tribes declined gradually during the following two centuries, leaving little evidence of their existence other than shell mounds. The Seminoles, a tribe of Creeks who assimilated other peoples into their own, made their living in the Everglades region after being forced there by the U.S. military in the Seminole Wars of the 19th century. Seminoles continue to live in and around the Everglades.
Draining the Everglades was first suggested in 1848, but canals were not attempted until 1882. Canals were constructed throughout the first half of the 20th century, and spurred the South Florida economy, prompting land development. However, problems with canals and floods caused by hurricanes forced engineers to rethink their drainage plans. In 1947, Congress formed the Central and Southern Florida Flood Control Project, which built of canals, levees, and water control devices. The South Florida metropolitan area grew substantially at this time and Everglades water was diverted to cities. Portions of the Everglades were transformed into farmland, where the primary crop was sugarcane. Approximately 50 percent of the original Everglades was turned into agricultural or urban areas. When the construction of a large airport was proposed north of Everglades National Park, an environmental study predicted it would destroy the South Florida ecosystem. Restoring the Everglades then became a priority.
National and international attention turned to the environment in the 1970s, and UNESCO and the Ramsar Convention designated the Everglades as one of only three wetland areas of global importance. Restoration began in the 1980s with the removal of a canal that straightened the Kissimmee River. The water quality of Lake Okeechobee, a water source for South Florida, became a significant concern. The deterioration of the environment was also linked to the diminishing quality of life in South Florida's urban areas. In 2000, a plan to restore the Everglades was submitted to Congress; to date, it is the most expensive and comprehensive environmental repair attempt in history. The Comprehensive Everglades Restoration Plan was signed into law, but the same divisive politics that had affected the region for the previous 50 years have compromised the plan.
The first written record of the Everglades was on Spanish maps made by cartographers who had not seen the land. They named the unknown area between the Gulf and Atlantic coasts of Florida Laguna del Espíritu Santo ("Lake of the Holy Spirit"). The area appeared on maps for decades without being explored. Writer John Grant Forbes in 1811 stated, "The Indians represent [the Southern points] as impenetrable; and the [British] surveyors, wreckers, and coasters, had not the means of exploring beyond the borders of the sea coast, and the mouths of rivers".
British surveyor John Gerard de Brahm, who mapped the coast of Florida in 1773, called the area "River Glades". At the time, and still today, a "glade" commonly meant an open grassy place in a forest, or a natural pasture. Both Marjory Stoneman Douglas and linguist Wallace McMullen suggest that cartographers substituted "Ever" for "River". The name "Everglades" first appeared on a map in 1823, although it was also spelled as "Ever Glades" as late as 1851. The Seminoles call it Pa-hay-okee, meaning "Grassy Water", and the region was labeled "Pa-hai-okee" on an American military map in 1839, although it appeared as "Ever Glades" throughout the Second Seminole War.
The geology of South Florida, together with a typical subtropical climate of warm, wet features, provides conditions well-suited for a large marshland ecosystem. Layers of porous and permeable limestone create water-bearing rock, soil, and aquifers that affect the climate, weather, and hydrology of South Florida. The properties of the rock underneath the Everglades can be explained by the geologic history of the state. The crust underneath Florida was at one point part of the African region of the supercontinent Gondwana. About 300 million years ago, North America merged with Africa, connecting Florida with North America. Volcanic activity centered around the eastern side of Florida covered the prevalent sedimentary rock with igneous rock. Continental rifting began to separate North America from Gondwana about 180 million years ago. When Florida was part of Africa, it was initially above water, but during the cooler Jurassic Period, the Florida Platform became a shallow marine environment. Through the Cretaceous Period, most of Florida remained a tropical sea floor of varying depths. The peninsula has been covered at least seven times by seawater since the bedrock formed.
Fluctuating sea levels compressed numerous layers of calcium carbonate, sand, and shells. The resulting permeable limestone formations that developed between 25 million and 70 million years ago created the Floridan Aquifer, which serves as the main source of fresh water for the northern portion of Florida. However, this aquifer lies beneath thousands of feet of impenetrable sedimentary rock, from Lake Okeechobee to the southern tip of the peninsula.
There are five geologic formations that make up the southern portion of Florida: the Tamiami Formation, Caloosahatchee Formation, Anastasia Formation, Miami Limestone (or Miami Oolite), and the Fort Thompson Formation. The Tamiami Formation is a compression of highly permeable light colored fossiliferous sands and pockets of quartz, thick. It is named for the Tamiami Trail that follows the upper bedrock of the Big Cypress Swamp, and underlies the southern portion of the Everglades. Between the Tamiami Formation and Lake Okeechobee is the Caloosahatchee Formation, named for the river over it. Much less permeable, this formation is highly calcitic and is composed of sandy shell marl, clay, and sand. Water underneath the Caloosahatchee Formation is typically very mineralized. Both the Tamiami and Caloosahatchee Formations developed during the Pliocene Epoch.
Surrounding the southern part of Lake Okeechobee is the Fort Thompson Formation, made of dense, hard limestone, shells, and sand. Rain water is less likely to erode the limestone to form solution holes—smaller versions of sinkholes that do not intersect with the water table. In this formation the beds are generally impermeable. Underneath the metropolitan areas of Palm Beach County is the Anastasia Formation, composed of shelly limestone, coquina, and sand representing a former mangrove or salt marsh. The Anastasia Formation is much more permeable and filled with pocks and solution holes. The Fort Thompson and Anastasia Formations, and Miami Limestone and were formed during the Sangamon interglacial period.
The geologic formations that have the most influence on the Everglades are the Miami Limestone and the Fort Thompson Formation. The Miami Limestone forms the floor of the lower Everglades. Close examination of surface rock of the Miami Limestone reveals that it is made up of ooids: tiny formations of egg-shaped concentric shells and calcium carbonate, formed around a single grain of sand. The Miami Limestone was formerly named the Miami Oolite, which comprises facies of ooids and fossilized bryozoan organisms. The unique structure was some of the first material used in housing in early 20th-century South Florida. The composition of this sedimentary formation affects the hydrology, plant life, and wildlife above it: the rock is especially porous and stores water during the dry season in the Everglades, and its chemical composition determines the vegetation prevalent in the region. The Miami Limestone also acts as a dam between Fort Lauderdale and Coot Bay.
The metropolitan areas of Miami, Fort Lauderdale, and West Palm Beach are located on a rise in elevation along the eastern coast of Florida, called the Eastern Coastal Ridge, that was formed as waves compressed ooids into a single formation. Along the western border of the Big Cypress Swamp is the Immokolee Ridge (or Immokolee Rise), a slight rise of compressed sand that divides the runoff between the Caloosahatchee River and The Big Cypress. This slight rise in elevation on both sides of the Everglades creates a basin, and forces water that overflows Lake Okeechobee to creep towards the southwest. The basin formation is so neatly rounded and so unlike the rest of the topography of Florida that one scientist hypothesized that it was created by an asteroid strike in South Florida approximately 36 million years ago. Under both the Miami Limestone formation and the Fort Thompson limestone is a surface aquifer that serves as the South Florida metropolitan area's fresh water source, called the Biscayne Aquifer. Rainfall and stored water in the Everglades replenish the Biscayne Aquifer directly.
With the rise of sea levels that occurred approximately 17,000 years ago, the runoff of water from Lake Okeechobee slowed and created the vast marshland that is now known as the Everglades. Slower runoff also created an accumulation of almost 18 feet (5.5 m) of peat in the area. The presence of such peat deposits, dated to about 5,000 years ago, is evidence that widespread flooding had occurred by then.
The consistent Everglades flooding is fed by the extensive Kissimmee, Caloosahatchee, Myakka, and Peace Rivers in central Florida. The Kissimmee River is a broad floodplain that empties directly into Lake Okeechobee, which at with an average depth of , is a vast but shallow lake. Soil deposits in the Everglades basin indicate that peat is deposited where the land is flooded consistently throughout the year. Calcium deposits are left behind when flooding is shorter. The deposits occur in areas where water rises and falls depending on rainfall, as opposed to water being stored in the rock from one year to the next. Calcium deposits are present where more limestone is exposed.
The area from Orlando to the tip of the Florida peninsula was at one point a single drainage unit. When rainfall exceeded the capacity of Lake Okeechobee and the Kissimmee River floodplain, it spilled over and flowed in a southwestern direction to empty into Florida Bay. Prior to urban and agricultural development in Florida, the Everglades began at the southern edge of Lake Okeechobee and flowed for approximately , emptying into the Gulf of Mexico. The limestone shelf is wide and slightly angled instead of having a narrow, deep channel characteristic of most rivers. The vertical gradient from Lake Okeechobee to Florida Bay is about per mile, creating an almost wide expanse of river that travels about half a mile (0.8 km) a day. This slow movement of a broad, shallow river is known as sheetflow, and gives the Everglades its nickname, River of Grass. Water leaving Lake Okeechobee may require months or years to reach its final destination, Florida Bay. The sheetflow travels so slowly that water is typically stored from one wet season to the next.
The ebb and flow of water has shaped the land and every ecosystem in South Florida throughout the Everglades' estimated 5,000 years of existence. The motion of water defines plant communities and how animals adapt to their habitats and food sources.
The climate of South Florida is noted for its variability, as average annual temperatures range from to . Temperatures in summer months typically exceed , although coastal locations are cooled by winds from the Gulf of Mexico and the Atlantic Ocean. Freezing in winter months occurs with varying severity and frequency. The region's subtropical to tropical climate features a 7-month wet season from April through October, when 75 percent of precipitation is related to tropical cyclones and thunderstorms. Only 25 percent on average of the annual precipitation falls during the dry season from November to March, usually sparked by cold fronts tracking southward. Annual rainfall averages approximately , with the Eastern Coastal Ridge receiving the majority of precipitation and the area surrounding Lake Okeechobee receiving about .
Unlike any other wetland system on earth, the Everglades are sustained primarily by the atmosphere. Evapotranspiration—a term used to describe the sum of evaporation and plant transpiration from the earth's land surface to atmosphere—associated with thunderstorms, is the key mechanism by which water leaves the region. During a year unaffected by drought, the rate may reach a year. When droughts take place, the rate may peak at over , and exceed the amount of rainfall. As water leaves an area through evaporation from groundwater or from plant matter, activated primarily by solar energy, it is then moved by wind patterns to other areas that border or flow into the Everglades watershed system. Evapotranspiration is responsible for approximately 70–90 percent of water entering undeveloped wetland regions in the Everglades.
Precipitation during the wet season is primarily caused by thunderstorms formed from Bermuda High pressure systems, blown ashore with the anti-clockwise flow. However, precipitation levels are often twice as high from August to October due to tropical depressions, storms, and hurricanes. Storm systems are significantly affected by El Niño and other global climate factors: between 1951 and 1980, precipitation in South Florida varied between and . Tropical storms average one a year, and major hurricanes about once every ten years. Between 1871 and 1981, 138 tropical cyclones struck directly over or close to the Everglades. Strong winds from these storms disperse plant seeds and replenish mangrove forests, coral reefs, and other ecosystems. Dramatic fluctuations in precipitation are characteristic of the South Florida climate. Droughts, floods, freezing, and tropical cyclones are part of the natural water system in the Everglades.
The Everglades are a complex system of interdependent ecosystems. Marjory Stoneman Douglas described the area as a "River of Grass" in 1947, though that metaphor represents only a portion of the system. The area recognized as the Everglades, prior to drainage, was a web of marshes and prairies in size. Borders between ecosystems are subtle or imperceptible. These systems shift, grow and shrink, die, or reappear within years or decades. Geologic factors, climate, and the frequency of fire help to create, maintain, or replace the ecosystems in the Everglades.
Water is the most dominant force and substance in the Everglades, and it shapes the land, vegetation, and animal life in South Florida. At the end of the Wisconsin ice age between 10,000 and 20,000 years ago, sea levels rose, submerging portions of the Florida peninsula and causing the water table to rise. Fresh water saturated the limestone, eroding some of it away, and created springs and sinkholes. The abundance of fresh water allowed new vegetation to take root, and formed convection thunderstorms over the land through evaporation.
As rain continued to fall, the slightly acidic rainwater dissolved the limestone. As limestone wore away, the groundwater came into contact with the surface land and created a massive wetland ecosystem. Although the region appears flat, the wearing away of limestone in some areas creates slight valleys and plateaus, rising or falling only a few inches, that not only affect the flow of water, but what types of vegetation take hold.
The underlying bedrock or limestone of the Everglades basin affects the hydroperiod, or how long an area within the region stays flooded throughout the year. Longer hydroperiods are possible in areas that were submerged beneath seawater for longer periods of time, while the geology of Florida was forming. More water is held within the porous ooids and limestone than older types of rock that spent more time above sea level. A hydroperiod of ten months or more fosters growth of sawgrass, whereas a shorter hydroperiod of six months or less promotes beds of periphyton, a growth of algae and other microscopic organisms. There are only two types of soil in the Everglades, peat and marl. Where there are longer hydroperiods, peat builds up over hundreds or thousands of years due to many generations of decaying plant matter. Where periphyton grows, the soil develops into marl, which is more calcitic in composition.
Initial attempts at developing agriculture near Lake Okeechobee were successful, but the nutrients in the peat quickly deteriorated. In a process called soil subsidence, oxidation of peat causes loss of volume. Bacteria decomposes dead sawgrass slowly underwater without oxygen. When the water was drained in the 1920s and bacteria interacted with oxygen, an aerobic reaction occurred. Microorganisms degraded the peat into carbon dioxide and water. Some of the peat was burned by settlers to clear the land. Some homes built in the areas of early farms had to have their foundations moved to stilts as the peat deteriorated; other areas lost approximately of soil depth.
Fire is an important element in the maintenance of the Everglades. The majority of fires are caused by lightning strikes from thunderstorms during the wet season. Their effects are largely superficial, and serve to foster specific plant growth: sawgrass will burn above water, but the roots are preserved underneath. Fire in the sawgrass marshes serves to keep out larger bushes and trees, and releases nutrients from decaying plant matter more efficiently than decomposition. Whereas in the wet season, dead plant matter and the tips of grasses and trees are burned, in the dry season the fire may be fed by organic peat and burn deeply, destroying root systems. Fires are confined by existing water and rainfall. It takes approximately 225 years for one foot (.30 m) of peat to develop, but in some locations the peat is less dense than it should be for the 5,000 years of the Everglades' existence. Scientists indicate fire as the cause; it is also cited as the reason for the black color of Everglades muck. Layers of charcoal have been detected in the peat in portions of the Everglades that indicate the region endured severe fires for years at a time, although this trend seems to have abated since the last occurrence in 940 BCE.
Several ecosystems are present in the Everglades, and boundaries between them are subtle or do not exist. The primary feature of the Everglades is the sawgrass marsh. The iconic water and sawgrass combination in the shallow river long and wide that spans from Lake Okeechobee to Florida Bay is often referred to as the "true Everglades" or just "the Glades". Prior to the first drainage attempts in 1905, the sheetflow occupied nearly a third of the lower Florida peninsula. Sawgrass thrives in the slowly moving water, but may die in unusually deep floods if oxygen is unable to reach its roots, and it is particularly vulnerable immediately after a fire. The hydroperiod for the marsh is at least nine months, and can last longer. Where sawgrass grows densely, few animals or other plants live, although alligators choose these locations for nesting. Where there is more room, periphyton grows. Periphyton supports larval insects and amphibians, which in turn are used as food by birds, fish, and reptiles. It also absorbs calcium from water, which adds to the calcitic composition of the marl.
Sloughs, or free-flowing channels of water, develop in between sawgrass prairies. Sloughs are about deeper than sawgrass marshes, and may stay flooded for at least 11 months out of the year and sometimes multiple years in a row. Aquatic animals such as turtles, alligators, snakes, and fish thrive in sloughs; they usually feed on aquatic invertebrates. Submerged and floating plants grow here, such as bladderwort (Utricularia), waterlily (Nymphaeaceae), and spatterdock (Nuphar lutea). Major sloughs in the Everglades system include the Shark River Slough flowing out to Florida Bay, Lostmans River Slough bordering The Big Cypress, and Taylor Slough in the eastern Everglades.
Wet prairies are slightly elevated like sawgrass marshes, but with greater plant diversity. The surface is covered in water only three to seven months of the year, and the water is, on average, shallow at only deep. When flooded, the marl can support a variety of water plants. Solution holes, or deep pits where the limestone has worn away, may remain flooded even when the prairies are dry, and they support aquatic invertebrates such as crayfish and snails, and larval amphibians which feed young wading birds. These regions tend to border between sloughs and sawgrass marshes.
Alligators have created a niche in wet prairies. With their claws and snouts they dig at low spots and create ponds free of vegetation that remain submerged throughout the dry season. Alligator holes are integral to the survival of aquatic invertebrates, turtles, fish, small mammals, and birds during extended drought periods. The alligators then feed upon some of what comes to the hole.
Small islands of trees growing on land raised between and above sloughs and prairies are called tropical hardwood hammocks. They may range from one (4,000 m²) to ten acres (.040 km²) in area, and appear in freshwater sloughs, sawgrass prairies, or pineland. Hammocks are slightly elevated on limestone plateaus risen several inches above the surrounding peat, or they may grow on land that has been unharmed by deep peat fires. Hardwood hammocks exhibit a mixture of subtropical and hardwood trees, such as Southern live oak (Quercus virginiana), gumbo limbo (Bursera simaruba), royal palm (Roystonea), and bustic (Dipholis salicifolia) that grow in very dense clumps. Near the base sharp saw palmettos (Serenoa repens), flourish, making the hammocks very difficult for people to penetrate, though small mammals, reptiles, and amphibians find these islands an ideal habitat. Water in sloughs flows around the islands creating moats. Though some ecosystems are maintained and promoted by fire, hammocks may take decades or centuries to recover; the moats around the hammocks protect the trees. The trees are limited in height by weather factors such as frost, lightning, and wind; the majority of trees in hammocks grow no higher than .
The most significant feature of the pineland (also called pine rockland) ecosystem is the single species of South Florida slash pine (Pinus elliotti). Pineland communities require fire to maintain them, and the trees have several adaptations that simultaneously promote and resist fire. They are located in the highest part of the Everglades with little to no hydroperiod, although some floors may have flooded solution holes or puddles for a few months at a time. The sandy floor of the pine forest is covered with dry pine needles that are highly flammable. South Florida slash pines are insulated by their bark to protect them from heat. Fire eliminates competing vegetation on the forest floor, and opens pine cones to germinate seeds. A period without significant fire can turn pineland into a hardwood hammock as larger trees overtake the slash pines. The understory shrubs in pine rocklands are the fire-resistant saw palmetto, cabbage palm, and West Indian lilac. The most diverse group of plants in the pine community are the herbs, of which there are two dozen species. These plants contain tubers and other mechanisms that allow them to sprout quickly after being charred.
Prior to urban development of the South Florida region, pine rocklands covered approximately in Miami-Dade County. Within Everglades National Park, of pine forests are protected, but outside the park, of pine communities remained as of 1990, averaging in area. The misunderstanding of the role of fire also played a part in the disappearance of pine forests in the area, as natural fires were put out and pine rocklands transitioned into hardwood hammocks. Prescribed fires occur in Everglades National Park in pine rocklands every three to seven years.
Cypress swamps can be found throughout the Everglades, but the largest covers most of Collier County. The Big Cypress Swamp is located to the west of the sawgrass prairies and sloughs, and it is commonly called "The Big Cypress. The name refers to its area rather than the height or diameter of the trees; at its most conservative estimate, the swamp measures , but the hydrologic boundary of The Big Cypress can be calculated at over . Most of The Big Cypress sits atop a bedrock covered by a thinner layer of limestone. The limestone underneath the Big Cypress contains quartz, which creates sandy soil that hosts a variety of vegetation different from what is found in other areas of the Everglades. The basin for The Big Cypress receives on average of water in the wet season.
Though The Big Cypress is the largest growth of cypress swamps in South Florida, cypress swamps can be found near the Atlantic Coastal Ridge and between Lake Okeechobee and the Eastern flatwoods, as well as in sawgrass marshes. Cypresses are conifers that are uniquely adapted to thrive in flooded conditions, with buttressed trunks and root projections that protrude out of the water, called "knees". Cypress trees grow in formations with the tallest and thickest trunks in the center, rooted in the deepest peat. As the peat thins out, cypresses grow smaller and thinner, giving the small forest the appearance of a dome from the outside. They also grow in strands, slightly elevated on a ridge of limestone bordered on either side by sloughs. Other hardwood trees can be found in cypress domes, such as red maple, swamp bay, and pop ash. If cypresses are removed, the hardwoods take over, and the ecosystem is recategorized as a mixed swamp forest.
Eventually the water from Lake Okeechobee and The Big Cypress makes its way to the ocean. Mangrove trees are well adapted to the transitional zone of brackish water where fresh water meets salt water. In the wet season the fresh water pours out into Florida Bay, and sawgrass appears closer to the coastline. In the dry season, and particularly in extended periods of drought, the salt water creeps inland into the coastal prairie, an ecosystem that buffers the freshwater marshes by absorbing sea water. Mangrove trees begin to grow in fresh water ecosystems when the salt water goes far enough inland. The Everglades have the most extensive continuous system of mangroves in the world. The estuarine ecosystem of the Ten Thousand Islands, which is comprised almost completely of mangrove forests, covers almost .
There are three species of trees that are considered mangroves: red, black, and white, although all are from different families. All grow in oxygen-poor soil, can survive drastic water level changes, and are tolerant of salt, brackish, and fresh water. All three mangrove species are integral to coastline protection during severe storms. Red mangroves have the farthest-reaching roots, trapping sediments that help build coastlines after and between storms. All three types of trees absorb the energy of waves and storm surges.
Much of the coast and the inner estuaries are built by mangroves; there is no border between the coastal marshes and the bay. Thus the marine ecosystems in Florida Bay are considered to be a part of the Everglades watershed and one of the ecosystems connected to and affected by the Everglades as a whole. More than of Florida Bay is protected by Everglades National Park, representing the largest body of water in the park boundaries. There are approximately a hundred keys in Florida Bay, many of which are mangrove forests. The fresh water coming into Florida Bay from the Everglades creates perfect conditions for vast beds of turtle grass and algae formations that are the foundation for animal life in the bay. Sea turtles and manatees eat the grass, while invertebrate animals, such as worms, clams and other mollusks eat the algae formations and microscopic plankton. Female sea turtles return annually to nest on the shore, and manatees spend the winter months in the warmer water of the bay. Sea grasses also serve to stabilize the sea beds and protect shorelines from erosion by absorbing energy from waves.
People arrived in the Florida peninsula approximately 15,000 years ago. Paleo-Indians came to Florida probably following large game that included giant sloths, saber-toothed cats, and spectacled bears. They found an arid landscape that supported plants and animals adapted for desert conditions. However, 6,500 years ago, climate changes brought a wetter landscape; large animals became extinct in Florida, and the Paleo-Indians slowly adapted and became the Archaic peoples. They conformed to the environmental changes, and created many tools with the various resources available to them. During the Late Archaic period, the climate became wetter again, and approximately 3000 BCE the rise of water tables allowed an increase in population and cultural activity. Florida Indians developed into three distinct but similar cultures that were named for the bodies of water near where they were located: Okeechobee, Caloosahatchee, and Glades.
From the Glades peoples, two major tribes emerged in the area: the Calusa and the Tequesta. The Calusa was the largest and most powerful tribe in South Florida. They controlled fifty villages located on Florida's west coast, around Lake Okeechobee, and on the Florida Keys. Most Calusa villages were located at the mouths of rivers or on key islands. The Calusa were hunter-gatherers who existed on small game, fish, turtles, alligators, shellfish, and various plants. Most of their tools were made of bone or teeth, although sharpened reeds were also effective for hunting or weapons. Calusa weapons consisted of bows and arrows, atlatls, and spears. Canoes were used for transportation, and South Florida tribes often canoed through the Everglades, but rarely lived in them. Canoe trips to Cuba were also common.
Estimated numbers of Calusa at the beginning of the Spanish occupation ranged from 4,000 to 7,000. The society declined in power and population; by 1697 their number was estimated to be about 1,000. In the early 1700s, the Calusa came under attack from the Yamasee to the north, and asked the Spanish to be removed to Cuba where almost 200 died of illness. Soon they were relocated again to the Florida Keys.
Second in power and number to the Calusa in South Florida were the Tequesta. They occupied the southestern portion of the lower peninsula in modern-day Dade and Broward counties. Like the Calusa, the Tequesta societies centered around the mouths of rivers. Their main village was probably on the Miami River or Little River. Spanish depictions of the Tequesta state that they were greatly feared by sailors who suspected them of torturing and killing survivors of shipwrecks. Spanish priests attempted to set up missions in 1743, but noted that the Tequesta were under assault from a neighboring tribe. When only 30 members were left, they were removed to Havana. A British surveyor in 1770 described multiple deserted villages in the region where the Tequesta lived. Common description of Native Americans in Florida by 1820 used only the term "Seminoles".
Following the demise of the Calusa and Tequesta, Native Americans in southern Florida were referred to as "Spanish Indians" in the 1740s, probably due to their friendlier relations with Spain. Creeks invaded the Florida peninsula and conquered and assimilated what was left of pre-Columbian societies into the Creek Confederacy. Seminoles originally settled in the northern portion of the territory, but were forced to live on a reservation north of Lake Okeechobee. They soon ranged farther south where they numbered approximately 300 in the Everglades region. They made a living by hunting and trading with white settlers, and raised domesticated animals. Seminoles made their villages in hardwood hammocks or pinelands, had diets of hominy and coontie roots, fish, turtles, venison, and small game. Their villages were not large, due to the limited size of the hammocks.
In 1817, Andrew Jackson invaded Florida to hasten its annexation to the United States, in what became known as the First Seminole War. After Florida became a U.S. territory in 1821, conflicts between settlers and Seminoles increased, causing the Second Seminole War from 1835 to 1842 and the Third Seminole War from 1855 to 1859. Between the two latter conflicts, almost 4,500 Seminoles were killed or relocated to Indian territory. The Seminole Wars pushed the Indians farther south and directly into the Everglades. By 1913, Seminoles in the Everglades numbered no more than 325.
Between the end of the last Seminole War and 1930, the tribe lived in relative isolation. The construction of the Tamiami Trail, beginning in 1928 and spanning from Tampa to Miami, altered their ways of life. They began to work in local farms, ranches, and souvenir stands. As metropolitan areas in South Florida began to grow, the Seminoles became closely associated with the Everglades, simultaneously seeking privacy and serving as a tourist attraction, wrestling alligators and selling craftworks. As of 2008, there were six Seminole reservations throughout Florida featuring casino gaming that support the tribe.
The military penetration of southern Florida offered the opportunity to map a poorly understood and largely unknown part of the country. An 1840 expedition into the Everglades offered the first printed account for the general public to read about the Everglades. The anonymous writer described the terrain the party was crossing: "No country that I have ever heard of bears any resemblance to it; it seems like a vast sea filled with grass and green trees, and expressly intended as a retreat for the rascally Indian, from which the white man would never seek to drive them".
The land seemed to inspire extreme reactions of both wonder or hatred. During the Second Seminole War an army surgeon wrote, "It is in fact a most hideous region to live in, a perfect paradise for Indians, alligators, serpents, frogs, and every other kind of loathsome reptile. In 1897, explorer Hugh Willoughby spent eight days canoeing with a party from the mouth of the Harney River to the Miami River. He wrote sent his observations to the New Orleans Times-Democrat. Willoughby described the water as healthy and wholesome, with numerous springs, and 10,000 alligators "more or less" in Lake Okeechobee. The party encountered thousands of birds near the Shark River, "killing hundreds, but they continued to return". Willoughby pointed out that much of the rest of the country had been explored and mapped except for this part of Florida, writing, "(w)e have a tract of land one hundred and thirty miles long and seventy miles wide that is as much unknown to the white man as the heart of Africa."
After the Civil War Florida formed an agency called the Internal Improvement Fund (IIF) whose purpose was to improve the state's roads, canals, and rail lines. The IIF found a Pennsylvania real estate developer named Hamilton Disston interested in implementing plans to drain the land for agriculture. Disston purchased of land for $1 million in 1881. Disston began constructing canals near St. Cloud. The canals seemed to work in lowering the water levels in the wetlands surrounding the rivers at first. The canals were effective in lowering the groundwater, but their capacity was insufficient for the wet season. Though Disston's canals did not drain well, his purchase primed the economy of Florida. It made news and attracted tourists and land buyers. Within four years property values doubled, and the population increased significantly.
The IIF was able to invest in projects due to Disston's purchase, and an opportunity presented itself when oil tycoon Henry Flagler began purchasing land and building rail lines along the east coast of Florida, as far south as Palm Beach in 1893. Along the way he built resort hotels, transforming territorial outposts into tourist destinations, and the land bordering the rail lines into citrus farms. By 1896 the rail line had been extended to Biscayne Bay. Three months after the first train had arrived, the residents of Miami voted to incorporate the town. Miami became a prime destination for extremely wealthy people after the Royal Palm Hotel was opened.
During the 1904 gubernatorial race, the strongest candidate, Napoleon Bonaparte Broward, based a significant portion of his campaign on draining the Everglades. He called the future of South Florida the "Empire of the Everglades". Soon after his successful election, he fulfilled his promise to "drain that abominable pestilence-ridden swamp", and pushed the Florida legislature to form a group of commissioners to oversee reclamation of flooded lands. In 1907 they established the Everglades Drainage District and began to study how to build the most effective canals, and how to fund them.
Governor Broward ran for the U.S. Senate in 1908 but lost. Broward was paid by land developer Richard J. Bolles to tour the state to promote drainage. He was elected to the Senate in 1910, but died before he could take office. Land in the Everglades was being sold for $15 an acre a month after Broward died. Meanwhile, Henry Flagler continued to build railway stations at towns as soon as the populations warranted them.
With the construction of canals, newly reclaimed Everglades land was promoted throughout the United States. Land developers sold 20,000 lots in a few months in 1912. Advertisements promised within eight weeks of arrival, a farmer could be making a living, although for many it took at least two months to clear the land. Some burned off the sawgrass or other vegetation to find the peat a source of fuel that continued to burn. Animals and tractors used for plowing got mired in the muck and were useless. When the muck dried, it turned to a fine black powder and created dust storms. Though initially crops sprouted quickly and lushly, they just as quickly wilted and died seemingly without reason.
The increasing population in towns near the Everglades provided hunting opportunities. Raccoons and otters were the most widely hunted for their skins. Hunting often went unchecked; in one trip, a Lake Okeechobee hunter killed 250 alligators and 172 otters. Wading birds were a particular target. Their feathers were used in women's hats in the late 19th century up to the 1920s. In 1886, 5 million birds were estimated to be killed for their feathers. They were shot usually in the spring, when their feathers were colored for mating and nesting. The plumes, or aigrettes, as they were called in the millinery business, sold for $32 an ounce in 1915—also the price of gold. Millinery was a $17 million a year industry that motivated plume harvesters to lay in watch of nests of egrets and many colored birds during the nesting season, shoot the parents with small-bore rifles, and leave the chicks to starve. Plumes from Everglades wading birds could be found in Havana, New York City, London, and Paris. Hunters could collect plumes from a hundred birds on a good day.
Rum-runners used the Everglades as a hiding spot during Prohibition; it was so vast there were never enough law enforcement officers to patrol it. The arrival of the railroad, and the discovery that adding trace elements like copper was the remedy for crops sprouting and dying quickly, soon created a population boom and new towns like Moore Haven, Clewiston, and Belle Glade. Sugarcane became the primary crop grown in South Florida. Miami experienced a second real estate boom that earned a developer in Coral Gables $150 million, and saw undeveloped land north of Miami sell for $30,600 an acre. In 1925, Miami newspapers published editions weighing over , most of it in real estate advertising. Waterfront property was the most highly valued. Mangrove trees were cut down and replaced with palm trees to improve the view. Acres of South Florida slash pine were cleared. Some of the pine was for lumber, but most of the pine forests in Dade County were cleared for development.
Two catastrophic hurricanes in 1926 and 1928 caused Lake Okeechobee to breach its levees, killing thousands of people. The government began to focus on the control of floods rather than drainage. The Okeechobee Flood Control District was created in 1929, financed by both state and federal funds. President Herbert Hoover toured the towns affected by the 1928 Okeechobee Hurricane ordered the Army Corps of Engineers to assist the communities surrounding the lake. Between 1930 and 1937 a dike long was built around the southern edge of the lake. Control of the Hoover Dike and the waters of Lake Okeechobee were delegated to federal powers: the United States declared legal limits of the lake to between . A massive canal was also constructed wide and deep through the Caloosahatchee River; whenever the lake rose too high, the excess water left through the canal. More than $20 million was spent on the entire project. Sugarcane production soared after the dike and canal were built. The populations of the small towns surrounding the lake jumped from 3,000 to 9,000 after World War II.
Immediately the effects of the Hoover Dike were seen. An extended drought occurred in the 1930s, with the wall preventing water leaving Lake Okeechobee and canals and ditches removing other water, parched the Everglades. Peat turned to dust. Salt ocean water intruded into Miami's wells; when the city brought in an expert to explain why, he discovered that the water in the Everglades was the area's groundwater—here, it appeared on the surface. In 1939, a million acres (4,000 km²) of Everglades burned, and the black clouds of peat and sawgrass fires hung over Miami. Scientists who took soil samples before draining did not take into account the organic composition of peat and muck in the Everglades was mixed with a bacteria that added to the process of decomposition under water because it was not mixed with oxygen. As soon as the water was gone and oxygen mixed with the soil, the bacteria began to break down the soil. In some places, homes had to be moved to stilts and of soil was lost.
The idea of a national park for the Everglades was pitched in 1928 when a Miami land developer named Ernest F. Coe established the Everglades Tropical National Park Association. It had enough support to be declared a national park by Congress in 1934. It took another 13 years to be dedicated on December 6, 1947. One month before the dedication of the park, a former editor from The Miami Herald and freelance writer named Marjory Stoneman Douglas released her first book titled The Everglades: River of Grass. After researching the region for five years, she described the history and ecology of the South Florida in great detail. She characterized the Everglades as a river instead of a stagnant swamp. The last chapter was titled, "The Eleventh Hour" and warned that the Everglades were dying, although it could be reversed.
The same year the park was dedicated, two hurricanes and the wet season caused to fall on South Florida. Though there were no human casualties, agricultural interests lost approximately $59 million. In 1948 Congress approved the Central and Southern Florida Project for Flood Control and Other Purposes (C&SF), who divided the Everglades into basins. In the northern Everglades were Water Conservation Areas (WCAs), and the Everglades Agricultural Area (EAA) bordering to the south of Lake Okeechobee. In the southern Everglades was Everglades National Park. Levees and pumping stations bordered each WCA, and released water in dryer times or removed it and pumped it to the ocean in times of flood. The WCAs took up approximately 37 percent of the original Everglades. The C&SF constructed over of canals, and hundreds of pumping stations and levees within three decades. During the 1950s and 1960s the South Florida metropolitan area grew four times as fast as the rest of the nation. Between 1940 and 1965, 6 million people moved to South Florida: 1,000 people moved to Miami every week. Developed areas between the mid 1950s and the late 1960s quadrupled. Much of the water reclaimed from the Everglades was sent to newly developed areas.
The C&SF established for the Everglades Agricultural Area—27 percent of the Everglades prior to development. In the late 1920s, agricultural experiments indicated that adding large amounts of manganese sulfate to Everglades muck produced a profitable harvest for vegetables. The primary cash crop in the EAA is sugarcane, though sod, beans, lettuce, celery, and rice are also grown. Fields in the EAA are typically , bordered by canals on two sides, that are connected to larger canals where water is pumped in or out depending on the needs of the crops. The fertilizers used on vegetables, along with high concentrations of nitrogen and phosphorus that are the byproduct of decayed soil necessary for sugarcane production, were pumped into WCAs south of the EAA. The introduction of large amounts of these chemicals provided opportunities for exotic plants to take hold in the Everglades. One of the defining characteristics of natural Everglades ecology is its ability to support itself in a nutrient-poor environment, and the introduction of fertilizers began to alter the plant life in the region.
A turning point came for development in the Everglades at the proposition of an expanded airport after Miami International Airport outgrew its capacities. The new jetport was planned to be larger than O'Hare, Dulles, JFK, and LAX airports combined, and the chosen location was north of Everglades National Park. The first sentence of the U.S. Department of Interior study of the environmental impact of the jetport read, "Development of the proposed jetport and its attendant facilities ... will inexorably destroy the south Florida ecosystem and thus the Everglades National Park". When studies indicated the proposed jetport would create of raw sewage a day and of jet engine pollutants a year, the project met staunch opposition. The New York Times called it a "blueprint for disaster", and Wisconsin senator Gaylord Nelson wrote to President Richard Nixon voicing his opposition: "It is a test of whether or not we are really committed in this country to protecting our environment." Governor Claude Kirk withdrew his support for the project, and Marjory Stoneman Douglas was persuaded at 79 years old to go on tour to give hundreds of speeches against it. Nixon instead established Big Cypress National Preserve, announcing it in the Special Message to the Congress Outlining the 1972 Environmental Program .
At the same time mercury was found in local fish at such high levels that consumption warnings were posted for fishermen. A Florida panther was found dead with levels of mercury high enough to kill a human. Scientists found that power plants and incinerators using fossil fuels were expelling mercury into the atmosphere, and it fell as rain or dust during droughts. The naturally occurring bacteria that reduce sulfur in the Everglades ecosystem were transforming the mercury into methylmercury, and it was bioaccumulating through the food chain. Stricter emissions standards helped lower mercury coming from power plants and incinerators, which in turn lowered mercury levels found in animals, though they continue to be a concern.
The Everglades Forever Act, introduced by Governor Lawton Chiles in 1994, was an attempt to legislate the lowering of phosphorus in Everglades waterways. The act put the South Florida Water Management District (SFWMD) and the Florida Department of Environmental Protection (DEP) in charge of testing and enforcing low phosphorus levels: 10 parts per billion (ppb) (down from 500 ppb in the 1980s). The SFWMD built Stormwater Treatment Areas (STAs) near sugarcane fields where water leaving the EAA flows into ponds lined with lime rock and layers of peat and calcareous periphyton. Testing has shown this method to be more effective than previously anticipated, bringing levels from 80 ppb to 10 ppb.
The Everglades also face an ongoing threat from the melaleuca tree (Melaleuca quinquenervia), because they take water in greater amounts than other trees. Melaleucas grow taller and more densely in the Everglades than in their native Australia, making them unsuitable as nesting areas for birds with wide wingspans. They also choke out native vegetation. More than $2 million has been spent on keeping them out of Everglades National Park.
Brazilian pepper, or Florida holly (Schinus terebinthifolius), has also wreaked havoc on the Everglades, exhibiting a tendency to spread rapidly and to crowd out native species of plants as well as to create inhospitable environments for native animals. It is especially difficult to eradicate and is readily propagated by birds, which eat its small red berries. The Brazilian Pepper problem is not exclusive to the Everglades; neither is the water hyacinth, which is a widespread problem in Florida's waterways, a major threat to endemic species, and is difficult and costly to eradicate. The Old World climbing fern (Lygodium microphyllum) may be causing the most harm to restoration as it blankets areas thickly, making it impossible for animals to pass through. It also climbs up trees and creates "fire ladders", allowing parts of the trees to burn that would otherwise remain unharmed.
Many pets have escaped or been released into the Everglades from the surrounding urban areas. Some find the conditions quite favorable and have established self-sustaining populations, competing for food and space with native animals. Many tropical fish have been released, but blue tilapias (Oreochromis aureus) cause damage to shallow waterways by creating large nests and consuming aquatic plants that protect native young fish.
Native to southern Asia, the Burmese python (Python molurus bivittatus) is a relatively new invasive species in the Everglades. The species can grow up to long and they compete with alligators for the top of the food chain. Florida wildlife officials speculate that pet owners released their pythons and they have begun reproducing rapidly in an environment for which they are well-suited.
The invasive species that causes the most damage is the cat, both domestic and feral. Cats that are let outside live close to suburban populations and have been estimated to number 640 per square mile. In such close numbers in historic migratory areas, they have devastating effects on migratory bird populations.
Though scientists made headway in decreasing mercury and phosphorus levels in water, the natural environment of South Florida continued to decline in the 1990s, and life in nearby cities reflected this downturn. To address the deterioration of the South Florida metropolitan area, Governor Lawton Chiles commissioned a report on the sustainability of the area. In 1995, Chiles published the commission's findings in a report that related the degradation of the Everglades ecosystems to the lower quality of life in urban areas. The report noted past environmental abuses that brought the state to a position to make a decision. Not acting to improve the South Florida ecosystem, the report predicted, would inevitably cause further and intolerable deterioration that would harm local tourism by 12,000 jobs and $200 million annually, and commercial fishing by 3,300 jobs and $52 million annually. Urban areas had grown beyond their capacities to sustain themselves. Crowded cities were facing problems such as high crime rates, traffic jams, severely overcrowded schools, and overtaxed public services; the report noted that water shortages were ironic, given the of rain the region received annually.
In 1999, an evaluation of the C&SF was submitted to Congress as part of the Water Development Act of 1992. The seven-year report, called the "Restudy", cited indicators of harm to the ecosystem: a 50 percent reduction in the original Everglades, diminished water storage, harmful timing of water releases from canals and pumping stations, an 85 to 90 percent decrease in wading bird populations over the past 50 years, and the decline of output from commercial fisheries. Bodies of water including Lake Okeechobee, the Caloosahatchee River, St. Lucie estuary, Lake Worth Lagoon, Biscayne Bay, Florida Bay and the Everglades reflected drastic water level changes, hypersalinity, and dramatic changes in marine and freshwater ecosystems. The Restudy noted the overall decline in water quality over the past 50 years was due to loss of wetlands that act as filters for polluted water. It predicted that without intervention the entire South Florida ecosystem would deteriorate. Water shortages would become common and some cities would have annual water restrictions.
The Restudy came with a plan to stop the declining environmental quality, and this proposal was to be the most expensive and comprehensive ecological repair project in history. The Comprehensive Everglades Restoration Plan (CERP) proposed more than 60 construction projects over 30 years to store water that was being flushed into the ocean, in reservoirs, underground aquifers, and abandoned quarries; add more Stormwater Treatment Areas to filter water that flowed into the lower Everglades; regulate water released from pumping stations into local waterways and improve water released to Everglades National Park and Water Conservation Areas; remove barriers to sheetflow by raising the Tamiami Trail and destroying the Miami Canal, and reuse wastewater for urban areas. The cost estimate for the entire plan was $7.8 billion, and in a bipartisan show of cooperation, CERP was voted through Congress with an overwhelming margin. It was signed by President Bill Clinton on December 11, 2000.
Since its signing, the State of Florida reports that it has spent more than $2 billion on the various projects. More than of Stormwater Treatment Areas have been constructed to filter of phosphorous from Everglades waters. An STA spanning was constructed in 2004, making it the largest manmade wetland in the world. Fifty-five percent of the land necessary to acquire for restoration has been purchased by the State of Florida, totaling . A plan to hasten the construction and funding of projects was put into place, named "Acceler8", spurring the start of six of eight large construction projects, including that of three large reservoirs. However, federal funds have not been forthcoming; CERP was signed when the U.S. government had a budget surplus, but since then the War in Iraq began, and two of CERP's major supporters in Congress retired. According to a story in The New York Times, state officials say the restoration is lost in a maze of "federal bureaucracy, a victim of 'analysis paralysis'". CERP still remains controversial as the projects slated for Acceler8, environmental activists note, are those that benefit urban areas, and regions in the Everglades in desperate need of water are still being neglected, suggesting that water is being diverted to make room for more people in an already overtaxed environment.
On June 24, 2008 the State of Florida agreed to buy U.S. Sugar and all of its manufacturing and production facilities for an estimated $1.7 billion. Florida officials indicated they intended to allow U.S. Sugar to process for six more years before dismissing its employees and dismantling the plant. The area, which includes of land, would then be rehabilitated and water flow from Lake Okeechobee would be restored.