Refer to the Figure

question 17

Essay

Refer to the figure.
Figure 1
You are studying a river in its natural state, unaffected by human activities. Your data are graphed in Figure 1. You began collecting data at the source of the river ("0 km" on the figure) and continued to sample the river every 1 km.
- Use your knowledge of nutrient cycles to answer the following questions:
a) Why is the nutrient cycle in a lake depicted as a circular cycle, while in a river it is depicted as a spiral?
b) In general, when would you expect the structure of the nutrient cycle of a river to most closely resemble that of a lake? In the case of your data, which location in the river most closely fits the conditions seen in a lake?

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