Comunidades de plantas nativas de Florida

Eutrophic lakes typically have major inflows and outflows, and their water and vegetation reflect high nutrient content. These lakes often accumulate deep peats and typically support broad vegetated shore zones. Most are considered nutrient-rich (eutrophic).

Vegetation

In shallow areas, vegetation tends to be dense, with emergent species such as cattails ( Typha spp. ) being common. Given the generally murky water, emergent vegetation dominates, while submersed vegetation is rare in deeper areas. Invasive aquatic plants are strongly associated with these lakes (Hoyer et al., 1996). Cypress fringes are also common along lake margins.

Human Impacts

Most eutrophic lakes in Florida have been significantly altered by humans—both in terms of hydrology and nutrient loading from input streams and upland runoff. A study of Little Lake Jackson in south-central Florida (Whitmore et al., 2006) illustrates such changes. Since 1890, land-use practices—including golf course and residential lawn management (liming and irrigation with alkaline well water), stormwater runoff, and septic leaching—have caused the lake to shift from acidic to alkaline, with greatly increased nutrient levels. These changes also likely altered water clarity and vegetation structure.

Ecological Importance

Despite water quality issues, eutrophic lakes support distinct plant communities and provide important habitat for birds, fish, insects, and water for surrounding upland animals. Compared to clear lakes, emergent vegetation here is restricted to very shallow areas, since light penetration is too low to sustain extensive submersed or floating-leaved vegetation.

Example Locations

• Lake Thonotosassa (Hillsborough County)
• Lake Okeechobee
• Lake Istokpoga (Highlands County)
• Most lakes along the St. Johns River

Floodplain Lakes

Floodplain lakes occur along major river systems, with the river itself serving as their primary water source. Nearly all are eutrophic, reflecting the nutrient-rich water quality of their associated streams.