Fire Ecology of South Florida Wetlands

The project objective is to determine the importance that season of burning has on the response of vegetation to fire. We have addressed this through the use of experimental prescribed fires at different times of the year. In Big Cypress National Preserve we have established a long-term study of season and frequency of burning in the unlogged hydric pinelands of the Raccoon Point area. This study includes three seasonal treatments: winter (dry season), spring (early wet season) and summer (mid wet season). A shorter study comparing the response to winter and summer burns was carried out in the pine rocklands on Big Pine Key. We are also studying the effect of season of burning on muhly grass (Muhlenbergia filipes), a component of hydric pinelands and often a dominant in short-hydroperiod wetlands known as muhly or marl prairies. We are conducting field and nursery studies to determine how the season of burning effects the rate of recovery of muhly and its ability to tolerate flooding.

Prescribed fire constitutes one of the most pervasive management actions influencing the restoration and maintenance of the Greater Everglades Ecosystem. It is generally assumed that lightning-ignited fires were common at the beginning of the rainy season, but there have probably been human-caused fires at other times for the last several thousand years. Since lighting-ignited fire cannot be allowed to operate naturally in South Florida, prescribed (or management-ignited) fire must be used to maintain these habitats. The seasonal occurrence of fire can have an important influence on ecological responses. We have conducted a set of experimental studies to determine the response of vegetation to different seasons of burning. The results of this work will influence the fire management of the publicly owned lands in the Greater Everglades ecosystem.