If all conditions are perfect daphnia live approximately 50 days.
If there isn't enough food the daphnia don't live as long.
This relationship is shown in the average life span graph.
Consumption per head is the input. Average life span is the output.
10. How many algae is a daphnia eating each day if it lives about 40 days? Remember each algae represents 1,000 algae.
The number of babies in a brood depends on the amount of food the mother can eat. This relationship is represented in the food factor converter.
Daphnia can have 8 babies in a brood. In the algorithm the brood size equals the food factor times 8.
The number of babies born each day equals the brood size times the number of females.
The babies spend 8 days growing. The model holds the babies in the juvenile conveyer. The conveyer is like the oven at the pizza shop. The raw pizza goes in one side. 15 minutes later the cooked pizza comes out the other side. After 8 days in the conveyer the mature daphnia are moved to the females stock.
Daphnia can live 50 days. If they don't get enough food they don't live as long. The average life span graph determines how long the daphnia can live.
The model calculates how many daphnia die by dividing the number of females by their average life span.
This model simulates putting some daphnia in a tank of algae.
11. Explain what you think would happen if you did this experiment. How would the number of daphnia and algae change? How many daphnia and algae would there be after 1 month, 2 months, 6 months?
