Essay on Mark: Biology and Population Growth Rate

890 WordsOct 14, 20124 Pages
BIOL 1209 Writing Assignment 2 Cover Sheet I certify that the writing in this assignment is my individual work and is my sole intellectual property. It does not contain the ideas, or writing of other individuals/authors. Author: Mark Cooper Jr. Date: 10/24/12 Lab Instructor: Katherine Hovanes Lab Section # 12 Population Ecology Experiment Background: Phosphate is an abiotic factor; therefore, it is a nonliving factor that affects living organism. In this experiment we prose to test the whether variation in environmental phosphate levels affects autotrophic organisms. We ran a lake and Chlamydomonas experiment in order to determine a solution for this question. In our lake experiment we took samples of water…show more content…
Lake Experiment (Ecosystem): Phosphorus Factor Null: Phosphate levels will not influence the abundance of aquatic autotrophic organisms in the lakes. Alternative: Phosphate levels will influence the abundance of aquatic autotrophic organisms in the lakes. Prediction: High levels of phosphate will cause an increase in the abundance of aquatic autotrophic organisms in the lakes. Results: Figure.1: The graphed data represents the growth rate of algae cells (population sizes million cells/mL) in each treatment over 21 day time period. We graphed the population sizes of the control, no-phosphorus, and high-phosphorus treatment. The control group contained 1 ml of Chlamydomonas and 4 ml of phosphate. The no-phosphorus group contained 0.5 ml of Chlamydomonas and 4.5 ml of phosphate . The high-phosphorus treatment contained 3 ml of Chlamydomonas and 2 ml of phosphate. Trend: there is no specific trend represented in the graph. However, No-Phosphorus contained the highest population growth rate with a slope of .19953. The Control and High-Phosphorus treatments had a similar growth rates. However, the Control treatment was higher than the High-Phosphorus treatment. The Control treatment possessed a slope of .1535, and the High-Phosphorus treatment slope of .1407 for. Figure2: The data
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