Carrying Capacity and Paramecium Aurelia Population

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Journal Questions

1. Make a hypothesis about how you think the two species of Paramecium will grow alone and how they will grow when they are grown together. (Make sure you understand what a hypothesis is before you address this!)

If Caudatum and Aurelia grow alone and they grow differently, how would they grow together?

2. Explain how you tested your hypothesis. (Give details of how you conducted your experiment. Consider this the “Methods” section of a lab report.)

I first look at all three test sample and see how many cells were there. I figure that at least one of them would grow faster than the other one. Caudatum grew the slowest and Aurelia grew the fastest. After looking at the two species alone, I look at the one with both of them. I could see that Aurelia was growing more than Caudatum.

3. On what day did the Paramecium caudatum population reach the carrying capacity of the environment when it was grown alone? How do you know?

Day 5, was the last day the count on the specie was high.

4. On what day did the Paramecium aurelia population reach the carrying capacity of the environment? How do you know?

Day 12, was the last day that the count on the specie was the highest.

5. Explain the differences in the population growth patterns of the two Paramecium species. What does this tell you about how Paramecium aurelia uses available resources?

The Caudatum grew the slowest and the count never got as high as the Aurelia. The Aurelia was at the highest count on the specie. Aurelia uses available resources and use another food source survives because they do not have to compete with individuals of the Caudatum for the food.

6. Describe what happened when the Paramecium populations were mixed in the same test tube. Do the results support the principle of competitive exclusion?

Aurelia grew the most with the mixed in the same test tube. You can see that Caudatum grew slower and the count was not as high from Aurelia....
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