Exam 22: Nutrient Supply and Cycling

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. -Answer the following questions: a) At what distance from the source is the river water moving the fastest? b) At what distance from the source is the river water moving the slowest? c) At what distance from the source is the river the deepest? d) At what distance from the source is the river the shallowest? e) Where is the river most likely flowing over the steepest terrain? f) Where is the river most likely flowing over the most level terrain?

Of nitrogen and phosphorus, which is the most limiting nutrient to primary production early in primary succession, and why?

A nutrient-poor lake with low primary productivity is referred to as

Refer to the table and the figure. Table 1 Figure 2 You are studying a river that has been dammed to form a reservoir. You have compiled data collected on this system over time (Table 1 and Figure 2). -Use the data in Table 1 and Figure 2 to answer the following questions about the effect of changes in water depth on the nutrient status of the reservoir: a) How did the average water depth change between 1970 and 1985? How can you explain this change in water depth? b) How do you think this change in water depth affected the nutrient status of the reservoir?

Refer to the table and the figure. Table 1 Figure 2 You are studying a river that has been dammed to form a reservoir. You have compiled data collected on this system over time (Table 1 and Figure 2). -Use your knowledge of nutrient cycles in aquatic systems and the data in Table 1 and Figure 2 to report summary data for this new system. a) Between which two sample years did dam construction begin? How did you deduce this? b) Prior to dam construction, what was the natural average flow rate of the river (round to one decimal place)? c) Prior to dam construction, what was the natural average water depth of the river (round to one decimal place)? d) By which year had the reservoir likely filled to capacity?

Which element is required by all (or almost all) animals but required by only C₄ and CAM plants?

Earthworms contribute to decomposition by

The residence times of nutrients in the soils of boreal forests are influenced the most by the

Refer to the table and the figure. Table 1 Figure 2 You are studying a river that has been dammed to form a reservoir. You have compiled data collected on this system over time (Table 1 and Figure 2). - Use the data in Table 1 and Figure 2 to answer the following questions about the effect of changes in water depth on the nutrient status and water clarity of the reservoir compared to the changes observed in Lake Washington: a) Compare the changes in the nutrient status of the reservoir to the changes in nutrient status observed in Lake Washington. How are they similar and how do they differ? b) Based on the changes in water clarity observed in Lake Washington, how would you expect water clarity in the reservoir to change as water depth decreases?

Which statement about color change during leaf senescence is false?

Why is upwelling important for the commercial fishery industry?

Lake Condor is at 3,000 meters of elevation. The area around it has a short growing season and the lake is rather deep. Based on this information, we would expect the lake to be

What would be the mean residence time of phosphorus in a pond if the total pool is 1,250 grams and the mean rate of input is 2,500 grams? (Assume that rates of input, output, and the total pool size have remained constant.)

Suppose that the mean residence time of nitrogen in a section of soil is 3.5 years, and the mean rate of input is 150 kilograms per year. If rates of input and output as well as the total pool size have remained roughly constant, what is the expected size of the total pool of nitrogen in that soil?

Why is there likely to be a higher diversity of plant species in soil derived from limestone than in soil derived from granite?

Organic matter with a _______ ratio results in a low net release of nutrients during decomposition. This is because microbial growth is more limited by _______ than it is by _______.