Please answer 3 and 4. Thank you. 72 3. Suppose someone added nitrates to the \"

Question

Please answer 3 and 4. Thank you.

72 3. Suppose someone added nitrates to the "Daphnia farm. What would we expect to happen to the population size of the algae? Explain. What would we expect to be the subsequent effect on the population size of the Daphnia? Explain. Students took water samples from the creek at an area just downstream from the soc- cer fields on campus. They got a phosphate concentration reading of 2 ppm (parts per million). In the next week, they repeated their water sampling at the same location and found the phosphate concentration to be 4 ppm. 4. What might have caused this increase in phosphate concentration over a week's time? What effect wou growth of aquatic plants in the creek? Explain. ld an increase in phosphate concentration in the water have on the hat effect would an increase in phosphate concentration in the water have on the concentration of dissolved oxygen in the creek? Explain. 5. Concerning Peabody Park: What was the original size of Peabody Park? How does the size of the Park today compare to the original size in 1901? What were the two Nitoric sectons' of Peabody Parka What is the name of the creek that flows through Peabody Park? n to the Peabody Park Ecosystem

Explanation / Answer

3. population size of the algae would increase as they use nitrates as a source of their nutrients and will creat a large proliferation of algae.

Daphnia is a small planktonic crustacean that eat primary producers such as algae, bacteri and yeast. eventhough it can be expected that their population size might also grow due to the increased amount of algae (their food source) daphnia population will decrease. this is becasue due to the increased growth of algae the oxygen level in water will deplete faster and also the temperature might increase. They are extremely sensitive to changes in water
toxicity. When Daphnia are exposed to hypoxic (low oxygen) conditions it causes changes in heartbeat or Daphnia death. and also their mortality increase with the increase temperature.

4. since its located downstream to a scocer field they phosphate in the filed might have washed off and get collected in the water. fertilizer used to maintain the grass field contain higher phosphate level and most of them are not utilized by grass as a nutrient so the excess/ accumulated phosphate might have leached to the underground water or washed off from the surface.

Acquatic plant population might decrease. due to the increased phosphate concentration algae might show a higher growth which will leads to a low dissolved oxygen level in water as algae consume the dissolved oxygen for their growth and increased phospahte will cause a drastic increase in algal population. and also they hinder the entrance of sunlight through water as they increase turbidity (form blankets) so the plants might not be able to do enough photosynthesis.

described above.

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