Buzzelli, C. P. Southeast Environmental Research Program, Florida International University, buzzelli@fiu.edu
Childers, D. P. Southeast Environmental Research Program and Department of Biology, Florida International University, childers@fiu.edu
Dailey, S. Department of Biology, Florida International University, sdaile01@fiu.edu

 
INVESTIGATION OF PERIPHYTON PHOSPHORUS RELATIONSHIPS IN EVERGLADES NATIONAL PARK: MECHANISTIC EXPERIMENTS ON A DESKTOP
 
Periphyton is an enigmatic component of the Everglades landscape. Although algae oftentimes bloom upon nutrient enrichment, periphyton loss is one of the first responses to phosphorus (P) eutrophification in the northern Everglades. Periphyton remains a conspicuous player in the unimpacted southern wetlands of Everglades National Park (ENP). Researchers have dosed mesocosms with P and observed losses, but what are the underlying mechanisms? We are developing a simulation model that accompanies a field research project to elucidate the mechanisms of potential P enrichment in ENP sloughs. The model integrates information, simulates biogeochemical patterns, and predicts impacts of P addition among the periphyton, soils, macrophytes, and consumers. Carbon and phosphorus uptake by the periphyton mat are modulated externally by SRP concentration and internally by the C:P ratio using donor/recipient feedbacks. P is recycled through particulate and dissolved pools back into SRP in the mat and water column, and periphyton access both SRP pools. Presently, we are calibrating the model to represent annual biomass, mat and water column SRP, primary production, and P uptake and removal. We are assembling a data set from field studies and periphyton specific experiments to verify model output.
 
Day: Friday, Feb. 5
Time: 09:30 - 09:45am
Location: Eldorado Hotel
 
Code: SS46FR0930E