Fire is the primary natural disturbance in interior Florida
scrub and sandhill, but hurricanes also periodically impact these xeric upland
ecosystems. In this study we investigated the effects of the 2004 hurricanes on
central Florida's
Lake Wales Ridge. In 2004-5, we sampled damage to trees in hundreds of demography
plots in different upland habitats. We also characterized disturbed microsites in 250 tip-up mounds and control plots in 2005-6.
Tree damage was most pronounced in long unburned scrub habitats with dense
canopies of sand pine (Pinus clausa), but
was also found in more open savanna-like sandhills. Rosemary
scrub and scrubby flatwoods- the primary habitats for many endemics- support
few trees and had minimal debris. Tip-up mounds were found mainly in
long-unburned sand pine scrub. In these sites, the size of tip-up mounds and
the disturbed area associated with them was related to tipped tree size and
site fire/disturbance history. Bare sand cover on tip-ups was about 14 % in
contrast to <2 % for control sites. Despite the creation of bare-sand microsites, seedling recruitment for nearly all species was
not different on tip-ups in comparison to controls, nor in bare sand in
comparison to other microsites. Rare endemics were not found in tip-ups or
controls. There may be a disconnect between hurricane
damage and fire which prevents tip-ups from serving as key open microhabitats
for most rare plants. Stands where trees are large enough to be blown over are
long-unburned and generally have not provided rare plant habitat for decades.