How Are the Saline Glades Changing?
While Cape Sable is unique, changes in plant communities in the park are not limited to that environment. Paralleling the shoreline in extreme southeast Florida is a clearly distinct vegetation community known locally as the saline glades. The saline glades is a long, linear zone of sparsely-vegetated marsh, much of which occurs within Everglades National Park. Because this area receives little freshwater flow and lies just out of reach of the tides, it is unfavorable to the growth of most inland and coastal plant species8. The zone is best characterized by the few plants species that can survive there: stunted red mangroves, sawgrass, and spike rush.
Over the past 50 years, the coastal vegetation of red mangroves has expanded its range inland (over 1 km in some areas) and has displaced other freshwater species8. The red mangroves are able to grow farther inland because the exchange of fresh and saline water in the marsh has been influenced by roads, canals, and sea level rise. Roads block the flow of fresh water from the north into the saline glades and canals reroute fresh water away from the area8. Storm surge and overwash from extreme high tides also deposit salt into the soils, making the area inhospitable to freshwater species, and rising seas have helped extend this reach farther inland. This increasingly salty environment makes it easier for saline species to grow, and reduces the overall area of freshwater marsh8. The increased sea level has also brought similar changes elsewhere in south Florida.
Images from Ross, M., J. Meeder, J. Sah, P. Ruiz, and G. Telesnicki 2000. "The Southeast Saline Everglades revisited: 50 years of coastal vegetation change." Journal of Vegetation Science 11:101-112.
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Did You Know?
Limestone is the porous, sedimentary rock you see in the Everglades. These rocks are made of calcium and contain fossils of sea life, evidence of ancient seas that once covered the area. The limestone aquifer under the Everglades acts as the principal water recharge area for all of south Florida.