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Bio 130iu Essay

2641 words - 11 pages

[4] Click on the names in the Species Legend in the upper right corner of the screen to bring up library pages for each group of species. Use the library to complete the following questions:
[ 4.1 ] Which species in the simulation is capable of nitrogen fixation?
[ 4.2 ] Members of which species in the simulation are commonly known as “water fleas”?
[5] Start the simulation by clicking the GO button in the CONTROL PANEL and watch the action for a
[ 5.1 ] Briefly describe what happens in the simulation when phytoplankton die. (Hint: They change color.)
© 2013, SimBio. All Rights Reserved. 5
SimBio Virtual Labs® | Nutrient Pollution
[ 6 ] [7]
Click the STOP button to pause the ...view middle of the document...

Because green algae tend to outcompete cyanobacteria, algal blooms are usually dominated by green algae. Therefore, your first set of experiments focuses on what happens to green algae when phosphorus (P) is increased. While you’re at it, you will record oxygen levels at the bottom of the lake to see any links between anoxia (lack of oxygen) and water pollution.
[1] Select P IN THE WATER from the SELECT AN EXERCISE menu at the top of the screen.
[2] Click PHOSPHORUS in the Chemical Input options (to the right of the TOOLS). Make sure it is set
to 1x (i.e., no extra phosphorus).
[3] Click the STEP 52 WEEKS button to run the simulation for one year. (Note: You can adjust the speed
of the simulation with the SPEED SLIDER tool in the CONTROL PANEL.)
[3.1] When the simulation stops, record the population size of green algae (from the graph), and the dissolved oxygen (DO) level (from the graph or from the meter at the bottom of the lake) in the first row of the data table which follows.
HINT: if you click on the colored bars in the Population Size graph, the numbers (population sizes) that the bars represent will pop up!
[4] Click the RESET button to start again with a new experimental lake.
[5] Increase PHOSPHORUS to 2x (double the starting concentration). Then click the STEP 52 WEEKS
button to run the simulation for one year.
[ 5.1 ] Record your data in the second row of the following data table.
[6] Click the RESET button, then increase PHOSPHORUS to 3x (triple the starting concentration). Then
click the STEP 52 WEEKS button.
[ 6.1 ] Record your data in the third row of the following data table.
© 2013, SimBio. All Rights Reserved. 7
SimBio Virtual Labs® | Nutrient Pollution
[ 6.2 ]
Data Table for Phosphorus Input Experiment
1X 2X 3X
Draw a line graph of your green algae population size data to show how green algae relate to phosphorus input levels. Don’t worry about being too precise; you can graph approximate values.
Does the relationship between green algae population size and phosphorus level indicate that phosphorus was a limiting nutrient for green algae in the lake? Explain.
[ 6.3 ]
© 2013, SimBio. All Rights Reserved. 8
SimBio Virtual Labs® | Nutrient Pollution
[ 6.4 ]
You also have recorded data from the oxygen meter at the bottom of the lake. Now draw a line graph showing how oxygen relates to phytoplankton population size. Again, don’t worry about being too precise; you can use approximate values of your data.
What is the relationship between dissolved oxygen and phosphorus in the lake?
Based on your two graphs, what is the relationship between green algae population size and dissolved oxygen the lake? Provide a biological explanation for your answer.
[ 6.5 ]
[ 6.6 ]
[7] Click the TEST YOUR UNDERSTANDING button in the bottom right corner of the screen and answer the question in the window that pops up.
© 2013,...

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