4. Why do you think the ratio of floating algae to sea floor algae levels in the Bay began to increase around 1750? (Hint: In the 1700s Europeans settlers began to establish farms in the Chesapeake region).
6. The ratio of floating algae to sea floor algae held steady for a very long time at around three and then suddenly increased towards eight starting after 1930. Use your graph to determine what happened to the oyster catch over the same time period.
7. How might the decline of oysters lead to the sudden increase in the ratio of floating algae to sea floor algae levels? Use what you know about the role of oysters in the Bay food web to answer this question.