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Take-home part of the Limnology Final Exam This part of the exam counts for 16 points of the 75 points on the final exam


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Take-home part of the Limnology Final Exam

This part of the exam counts for 16 points of the 75 points on the final exam

Lake Wooten is a 7-acre lake located in suburban Kennesaw created by an earthen dam constructed more than 25 years ago.



Parameter

Data collected on 1 and 3 December 2015

Historical data collected on

on 4 December 2013

Historical data collected on

29 November 2011

Historical data collected on

3 December 2009

Historical data collected on

27 November 2007

Historical data collected by a previous KSU class in February- March 2004

Aquatic plants:


Zannechellia palustris (Horned Pond Weed)

Myriophyllum aquaticum (parrotfeather watermilfoil)

Small amounts of both along margin of lake




Zannechellia palustris (Horned Pond Weed) abundant in mid-lake

Myriophyllum aquaticum (parrotfeather watermilfoil) along margin of lake


Zannechellia palustris (Horned Pond Weed)


Hygrophila polysperma

(East Indian Hygrophila)



Zannechellia palustris (Horned Pond Weed)

Myriophyllum aquaticum (parrotfeather watermilfoil)

Not reported




Tues / Thursday

Mid-lake / Dock













Temperature:


14.6 / 12.2 °C

10.4 / 12.2°C

12.0°C

10°C

12.8°C

--

Specific Conductivity:


42.5 / 41.8 µs/S

45.9 / 52.0 µS/cm

47.3 µS

38.5 µS

43 µS

--

Dissolved Oxygen:


8.92 / 8.01

9.0 / 7.22 mg/l

5.09 mg/l

7.79 mg/l

7.49 mg/l (71% sat.)

10 mg/l

pH:


7.01 / 8.01

6.36 / 6.44

6.2

6.78

7.04

6.0 – 8.5

Chlorophyll:

10.6 / 11.9 ppb


1.9 ppb / n/a

3.1 ppb


3.2 ppb

4.0 ppb

--

Turbidity:

10.4 / 7.98

9.1, 9.0 / 4.9, 4.7 NTU

7.81, 7.97 NYU

14.8, 14.7 NTU

3.79, 3.49, 3.57, 3.52 NTU

27-210 NTU

Secchi depth

>1.0 m

0.9 m / 1.1 m

0.95 m

0.71, 0.55. 0.58 m

2.0 m

0.2-0.7 m

(1.7 m in summer 2002)



Sediment depth

0.12 m (dock)

0.13 m (dock)

0.16 cm (dock)

0.21 m (dock)

0.24 m (mid lake)

n/a

Total Phosphorus

n/a

79, 76 / 70, 67 ppb

143, 203 ppb (µg/l)

n/a

n/a

n/a

Dissolved Phosphorus

n/a

16, 21 / 35, 46 ppb

31, 33 ppb (µg/l)

n/a

103, 106 ppb (µg/l)

n/a

Ammonia

n/a

94, 105 / 106, 96 ppb

262, 269 ppb (µg/l)

n/a

890, 930, 830 µg/l

150 - 370 µg/l

Nitrate

n/a

217 ppb / n/a

192, 176 ppb (µg/l)

n/a

n/a

120 – 290 µg/l

Fecal Coliform Bacteria

n/a

n/a

n/a

n/a

19 colonies / 100 ml

30 colonies / 100 ml

Fluorescence

127.5 / 87.78

n/a

59.2, 58.7

62.5

n/a

n/a

Alkalinity

n/a

n/a

n/a

70 mg/l as CaCO3


n/a

n/a

Photic depth

n/a

n/a

0.69 at surface

0.35 at 0.35 m

0.21 at 0.60 m

0.12 at 0.75 m



0.63 at surface

0.37 at 0.25 m

0.19 at 0.50 m

0.08 at 0.75 m



n/a

n/a

State standards for swimming are <200 colonies / 100 ml.

State standard for surface D.O. is >4.0 mg/l.

“n/a” = not available

Assignment:

1. Identify the most likely uses (goals) for the lake for property owners living next to the lake.


2. Based on your answer to Question 1 and the data you collected, identify what might be the greatest problem or potential threat to these uses/goals. Explain why you believe this based on the data you collected.
3. Recommend two management strategies to address the problem and achieve the desired goals (or to maintain it against its greatest threat). For each, explain in a paragraph how this strategy will work and why it was chosen. At least one of the strategies should be a standard technique used in lake management (with the other you may be creative, but be sure again to explain how it will logically bring about the desired change). Cite at least one source (other than in-class lectures; web sources are acceptable). Be specific (i.e. don’t just say “dump some herbicides in it, or clean up the watershed).
4. Explain possible negative outcomes that your strategies could result in?
DO THIS EXAM COMPLETELY ON YOUR OWN! You may use historical data as well as this year’s data in your arguments.


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