Sawgrass Prairie: The Everglades' Defining Ecosystem

"River of Grass" — A Unique Freshwater Marsh

Sawgrass prairie is the signature ecosystem of the Florida Everglades and adjacent southeastern US wetlands. Dominated by Cladium jamaicense (sawgrass)—not a true grass but a sedge—it forms vast, seasonally flooded expanses teeming with life.

Defining Characteristics

• Vegetation: Monoculture of sawgrass, 6–10 ft tall, serrated edges (hence "saw"), rhizomatous, perennial.
• Hydrology: Sheet flow — slow (100 ft/day), shallow (6–18 in) water moving south over limestone bedrock. Wet season (May–Oct) floods; dry season (Nov–Apr) exposes peat.
• Microtopography: Tree islands (hammocks) — slightly elevated teardrop-shaped ridges with tropical hardwoods (gumbo limbo, mahogany, live oak). Critical dry-season refugia.
• Fire: Natural lightning fires every 3–7 years. Clears dead biomass, recycles nutrients, prevents woody encroachment, stimulates sawgrass flowering. Suppressed fire → shrub invasion.
• Soil: Peat (organic) over limestone. Oxidizes/subsides when drained.

Biodiversity Hotspot

• Birds: Snail kite (endemic, eats apple snails), wood stork, roseate spoonbill, herons, egrets, limpkin.
• Reptiles: American alligator (keystone—creates "gator holes" holding water in dry season), turtles, snakes.
• Mammals: Florida panther (critical habitat), white-tailed deer, raccoon, otter, marsh rabbit.
• Fish/Inverts: Apple snails, crayfish, mosquitofish, gar, bowfin.

Ecosystem Services

• Water filtration & aquifer recharge (Biscayne Aquifer → 8M South Floridians)
• Flood attenuation (slow release)
• Carbon sequestration (peat)
• Nutrient cycling (N, P retention)
• Recreation (airboating, birding, photography)

Threats & Restoration

50% lost to drainage (agriculture/EAA), development, altered hydrology (canals, levees), nutrient pollution (P from farms → cattail invasion), invasive species (Burmese python, melaleuca). CERP (Comprehensive Everglades Restoration Plan) — $20B+, largest ecosystem restoration ever — aims to restore sheet flow, water quality, and spatial extent.