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magnitudes of the curves from the two models are

approximately the same but the shapes of the curves differ,

those from Model I being broader, and those from Model II

showing greater extremes. Simulation results of bird

biomass in both models approach zero during the summer

months, suggesting that the study region cannot support

Wood Storks during this time, which may reflect conditions

that cause the birds, in reality, to leave the area in the

early summer and not return until fall.

 Figure 72 gives the analog functions for the five

conditions of drainage used in the models to test ecosystem

response. Also given in Figure 72 are the simulated

products of solar radiation and the five conditions of

drainage. The labels for the curves on these and the

following four figures correspond to the alphabetic

characters in Figure 70 and Appendix Table B-1. Figure 73

demonstrates ecosystem response to the different conditions

in Model I, and Figure 74 shows ecosystem response to the

different conditions in Model II.

 Maximum values of fish biomass, fish density, bird

biomass and bird number differ markedly under the different

conditions of drainage. Differences are greater in Model I

than in Model II, suggesting that the second model is much

more sensitive to change in drainage conditions. In Model

I, (Figure 73), fish biomass varies from a maximum of

approximately 1 g/sq-m under primitive conditions to a

maximum of 0.05 g/sq-m under most extreme drainage