Lab 5 Answer Sheet Essay

698 Words Mar 1st, 2016 3 Pages
Lab 5 Nutrient Pollution – Answer Sheet
The numbers in [brackets] indicate the corresponding question number in the lab notebook
Exercise 2: P in the Water 18pts 1) [6.1] Fill in the data table below. (2pts) Input | Green Algae Population Size | Dissolved Oxygen (mg/L) | 1x | | | 2x | | | 3x | | |

2) [6.2] In Microsoft Excel (I’ve provided an Excel spreadsheet, but you are welcome to use the spreadsheet application of your choice: Google Sheets, OpenOffice, etc.) plot a line graph of your green algae population size data to show how green algae relate to phosphorus input levels. Think about which is the dependent and which is the independent variable. Be sure to label your axes. Copy your completed graph into the
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Explain in 2-3 sentences. (2pts)

Exercise 4: Toxins! 14pts 10) Fill in and interpret the mercury data. a. [2.1, 3.1] Fill in the data table below. (2pts) | Mercury (ng/g) | Time (years) | GREEN ALGAE | CYANOBACTERIA | DAPHNIA | BOSMINA | TROUT | 0 | | | | | | 1 | | | | | | 2 | | | | | | 3 | | | | | |

b. [3.3] Is there more mercury in the phytoplankton at the base of the food chain or in the fish at the top? (2pts)

c. [3.3] Does this change over time? (2pts)

11) [3.2] In Microsoft Excel (or spreadsheet application of your choice: see above), plot a line graph that shows how the mercury concentration of the five species varies over time. Think about which is the dependent and which is the independent variable. Be sure to label your axes. Copy your completed graph into the space below. (4pts)

12) [3.4] Does your graph show evidence for biomagnification of mercury in this lake? Explain in 4-5 sentences. (4pts)

Exercise 5: Mystery Lake 12pts 13) [2.1] Is there a difference in the biology of these two phytoplankton that might be related to what is happening in this lake? (Look back at the natural history if you need to.) d. What is this difference?(2pt)

e. State and explain your hypothesis (2pt)

14) [2.2] If a nutrient is limited for a particular species, what happens when you add more of that nutrient to the

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