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Assignment 12-1

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4.1.
Which species in the simulation is capable of nitrogen fixation?
Cyanobacteria.
4.2.
Members of which species in the simulation are commonly known as “water fleas”?
Daphnia
5.1.
Briefly describe what happens in the simulation when phytoplankton die.

7.1.
Based on your sampling, what do Bosmina in the lake eat?
Green Algae.
7.2.
Based on your sampling, what do Daphnia in the lake eat?
Green Algae.
7.3.
Based on your sampling, what do Trout in the lake eat?
Daphnia and Bosmina.

8.1.
After reading the above statement, did you miss any species in your gut content sampling? If so, which ones?
The specie I missed was cyanobacteria.
Exercise 2: P in the Water.
3.1.
When the simulation stops, record the population…show more content…
The dissolved oxygen levels are much higher in this experiment than in the previous experiment.
6.1.
Why could having consumers as well as producers present change the amount of dissolved oxygen in the lake?
Consumers will consume oxygen and these will take the oxygen from the lake. This in turn will cause the dissolved oxygen level.
8.1.
Does the dissolved oxygen continue to drop over time?
The dissolved oxygen level continued to drop until it went 2.9. Once it got bottomed out it started to rise again.
8.2.
What happens when the dissolved oxygen drops below 2.0?
When the dissolved oxygen level drops below 2.0 the trout seem to lose all their coloring. Once they lose their coloring they do not get it back.

Toxins
1.1.
If mercury biomagnifies, in which of the organisms would you expect to find the highest mercury levels in a lake with mercury contamination?
Trout.

2.1. | Population Size | Mercury | Green Algae | 130 | 0 ng/g | Cyanobacteria | 20 | 0 ng/g | Daphnia | 10 | 0 ng/g | Bosmina | 20 | 0 ng/g | Trout | 5 | 0 ng/g |

3.1. Toxin analysis data: Time = 1 year | Population Size | Mercury | Green Algae | 130 | 53 ng/g | Cyanobacteria | 14 | 30 ng/g | Daphnia | 3 | 42 ng/g | Bosmina | 15 | 88 ng/g | Trout | 5 | 29 |

Toxin Analysis data: Time = 2 years | Population Size | Mercury | Green Algae | 123 | 60 ng/g | Cyanobacteria | 11 | 40 ng/g
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