Description Of Vensim Model
To use the Vensim Model slide the sliders from left to right to adjust each rate. Each rate has an a affect on the others, so remember to do reasonable rates. Because birds birth rate relies on the worms, the birds birth rate can fluctuate depending on the worms death rate. The worms can either die from old age or be consumed You can Download the File Here
ScreenShots
Description: This screen shot shows the natural birth and death rates of the worms and birds in the prey and predator relationship. As the Birds consumes the worms, the worm's death rate increases. As birds resources, the worm's population, decreases, the birds birth rate goes down as birds struggle to stay alive.
Description: This screen shot shows the population when the worms death rate, consumption rates are low and birth rate is high. The birds food is replenished frequently, therefore birds birth rates increase frequently. But, because the birds consume faster than the worms can be born, both the population numbers sink.
Description: This screen shot shows a reasonable estimate of the real world. Where the worms population is higer than the birds. The birds depend on the worms to be alive so they can be eaten as food.