Mark: Biology and Population Growth Rate

Topics: Biology, Organism, Population growth Pages: 4 (904 words) Published: October 25, 2012
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
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 from University Lake a recorded the phosphate level and the chlorophyll absorbance readings. Chlorophyll absorbance readings are used to indirectly measures autotrophic organism levels within different situations. Similarly, in the Chlamydomonas experiment we added a control, low phosphorus, and high phosphorus treatments to populations of Chlamydomonas. Chlamydomonas are a genus of unicellular green algae called Chlorophyta. (Wishchusen) In the Chlamydomonas experiment, we recorded the chlorophyll absorbance readings for each treatment over 21 day time span. General Question:

How does variation in environmental phosphate levels affect autotrophic organism? Specific Question:
How does phosphate levels influence population growth rate of Chlamydomonas in a laboratory setting? How do phosphate levels influence the abundance of aquatic autotrophic organisms in the lakes? Hypothesis:

Chlamydomonas Experiment (Population): Phosphorus Factor
Null: The level of phosphate will not affect the population growth rate in a laboratory setting. Alternative: The level of phosphate will affect the population growth rate in laboratory setting Prediction: The high phosphorus treatment will have the highest level of population growth rate...
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