RESULTS Models using rainfall data and topographic information simulated the natural expansion and contraction of wetland area in southwest Florida and the effect of drainage on the natural pattern. Field studies, supplemented by material from previous investigations, provided basic data for models of the effect of expansion and contraction of wetland area on concentration and population size of freshwater fish. Observations from an aerial survey of Wood Storks and fish-eating wading birds developed understanding of spatial and temporal patterns of foraging in relation to the regional-scale dry-down. Information from this survey, demographic and biological information on Wood Storks, and the results from models relating expansion and contraction of wetland areas to fish concentration were used to simulate the effect of drainage in southwest Florida on breeding success and population size of the Wood Stork. The following section presents the results of these investigations. Rainfall Pattern Moving Averages Figure 20 is a plot of moving 5-yr averages of total annual rainfall at Corkscrew grove indicating a downward 112