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Nicole Borkowski WA2

Nicole Borkowski WA2 - Nicole Borkowski Bio Lab 1209 Maria...

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Nicole Borkowski Bio Lab 1209 Maria Mercedes Gavilanez Section 17 For organization purposes: A. Chlamydomonas Population Growth B. Aquatic Community Ecology Scenario : A. Is population growth of Chlamydomonas affected by a change in temperature? Chlamydomonas is a genus of unicellular green algae (Chlorophyta). Optimal growth for algae is usually between 20-25 o C, though the cells can survive exposure to 35 o C and may be grown at lower temperatures ("Chlamy Connection"). As stated above, when the temperature of these Chlamydomonas populations changes, the populations can still grow. This experiment will be conducted in the lab and the goal is to determine if the growth rate will change at different temperatures. Also, we’re trying to determine at what temperature the Chlamydomonas will have the highest growth rate, ultimately determining the optimal temperature for the Chlamydomonas algae to grow. B. How does the temperature of University Lake affect Chlorophyll abundance in the fall compared to the spring? Chlorophyll is a measure of the abundance of phytoplankton, a suspended microscopic alga found in University Lake. Chlorophyll is the pigment in phytoplankton that captures sunlight for the process of photosynthesis (Grove 2001). The abundance of chlorophyll in University Lake will ultimately tell us the population size of the phytoplankton algae, which will be used to determine the optimal temperature at which organisms survive and grow in an aquatic ecosystem. The water temperatures of University Lake in the fall and spring of 2009-2011 will be incorporated into the experiment by giving us a temperature change to compare the chlorophyll abundance to. Null Hypothesis: A. The growth rate of Chlamydomonas will not change when placed in low, high, or control (room temperature) environments. There will be no change in the rate of population growth regardless of the temperature the algae is placed in. B. The abundance of Chlorophyll will not change in University Lake when the temperature changes in the spring and fall seasons. Alternate Hypothesis: A. The temperature in which the Chlamydomonas is placed (high, low, or room temperature) will affect the rate of growth of the population.
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B. The abundance of Chlorophyll in University Lake will change when the temperature changes in the fall and the spring.
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