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Effect of Predator Efficiency on Equilibrium Densities & Pop. Stability
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Screen Shots:

 

 

 User Instructions:

 

 The simulator consists of three regions: the simulator's viewable window, the variables menu and the simulation controls menu.

 

The User Window: 

 

 

The Variables Menu:

 

 

 The values entered in 'Variables' Menu are default values. User can change the values according to the Data to be tested (try to study with different values for the parameters!).

 

 

The Variables Menu contains:

 

  • The drop down menu where the user can choose:
  1.    Equilibrium densities.
  2.    Population stabilities.
     

 

 

The 'Initial prey population' tab lets the user set the initial number of prey individuals that he/she wishes to run.

 

 

The 'Initial predator population' tab lets the user set the initial number of predator individuals that he/she wishes to run.

 

 

The 'Number of steps' tab allows the user the option to run the simulator in as many steps he/she wishes to run.

 

 

The 'Step size' tab allows the user to accomplish the number of steps given in the previous tab in terms of the step size given in this tab, for example say if number of step is 10 and the step size is 10 then the simulation could be over in just one step. For the same number of steps as in previous case if the step size was given as 1 then simulation would have finished in 10 steps only.

 

 

The 'Rate of growth' tab provides the user the option to run the simulator with his/her desired rate of growth of the individuals.

 

 

The 'Theta value' tab provides the user the option to run the simulator with the provided theta value he/she wishes to run.

 

 

The 'Encounters result in kill' tab provides the user the option to run the simulator to set the number of successive kills made by the predator that he/she wishes to run.

 

 

The 'Predator conversion' tab provides the user the option to run the simulator with the amount of prey material consumed by the predator that he/she wishes to run.

 

The 'Predator death rate' tab provides the user the option to run the simulator with the given death rate of the predator that he/she wishes to run.

 

 

The 'Carrying capacity' tab provides the user the option to set the minimum and maximum carrying capacities that he/she wishes to run.

 

 

The below contains the tools for 'Controls'

 

 

'Step run' button is meant for manually running the simulator, step by step (in accordance to the values given in step size). For example, if the models population in every 0.1 year is to be calculated, in each step run, the model population possible change for every 0.1 year is calculated and produced.

 

 

'Run Iteration', as the literal word meaning runs the simulator slowly each step by step with the same previously entered values repeatedly till the T time, can also be paused in between to get the values at the corresponding, desired time.

 

 

 'Play/pause' button as in all cases is for pausing (and continuing) the simulator at any step needed while performing Iterations (slowly, repeatedly calculating the population possible in each step).

 

 

The 'Reset' button resets the simulator to the default values.

 

 

The 'Viewable Window' has some additional buttons meant for various other purposes, The 'Statistics' button is meant for viewing the time varying change in population by each step, for the entered values in the simulator.
A sample for the 'User Window' when checked for the 'Statistics' could be,

 

 

 

 

The next is the 'The next is the 'Data plots' button having a graph symbol, on clicking will change the 'Viewable Window' to a graphical plot.' button having a graph symbol, on clicking will change the 'Viewable Window' to a graphical plot.

 

 

 


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