303


17,000 fledglings produced in the 1960-61 season. Of

course the rainfall patterns of 1960-61 and 1974-75 were

not the same.

 Figure 75 shows the analog functions for surface water

area having the same average (present condition), but five

different degrees of damped functions for surface water

area. Figure 76 presents simulations from Model 11 showing

ecosystem response to damping of the water area function.

Damping the oscillation reduced the standing stock of fish,

fish concentration, stork biomass, and the annual number of

young storks the system could produce, even though the

average annual input to the model was the same, indicating

that the same area with permanent wetlands could not

produce as many birds. One measure of the importance of

oscillation to energy'flow in this system is the difference

between fledgling production with the present degree of

oscillation and 1974-75 rainfall, 4,025 birds, and

fledgling production with no oscillation, 920 birds (Figure

76).




 Water Area, Fish, and Storks Model III

 In Figure 77 is the model that most completely

develops the structure of the system at all three described

levels of organization. This diagram of Model III of water

area, fish and storks gives values for initial conditions

for flows and compartments, fall 1950. Equations for the