Paramecium Aurelia Essay

In experiment 1, the growth of Paramecium aurelia fits the curve of the logistic population growth because they have limited resources as the intraspecific competition, influencing negatively on fitness for both individuals. From Day 0 to Day 12, with unlimited resource, Paramecium aurelia is at the acceleration phase, more growing cells than dead cells. Day 12 where the inflection point is indicates the growth rate changes to constant. After Day 12 and until Day 14, the growth enters the deceleration phase that the birth rate almost equals to the birth rate. Beginning at Day 14, there is a steady state because the birth rate equals to the death rate. The number of paramecia goes from 796.1 cells/ml to 851.1cells/ml The growth of Paramecium aurelia is affected by the environment resistance since after the acceleration phase, they compete for the limited resources, like bacteria which live in the …show more content…
According to the competitive exclusion principle, as one population will use the resources more efficiently and have a reproductive advantage which will cuase the elimination of the other population, it can be explained that Paramecium aurelia grows in exponential growth while Paramecium caudatum is finally eliminated (Campbell and Reece 2011). Paramecium aurelia, compared with Paramecium caudatum, takes advantages on biotic potential, and recruitment. And also it is able to adapt to factors that prevent a population from growing better (Wichterman 1953). Therefore, when Paramecium aurelia competes with Paramecium caudatum, Paramecium aurelia uses them more effectively while having a greater resistance to waste products. Consequently, it will survive in the interpecific competition unlike Paramecium caudatum which dies at last resulting from being unable to get sufficient food, having low recruitment, and weak ability to adapt to waste products. The growth of paramecium of two species in one medium meets the