I
Leader
Others
II
Leader
Others
III
Leader
Others
IV
Leader
Others
EXERCISES
Diurnal Changes in a Stream Ecosystem
317
Type of data to be collected Materials or method required
Physical
Solar radiation
See Exercises 2 and 4
Air temperature
See Exercises 2 and 4
Water temperature
See Exercises 2 and 4
Channel morphology
See Exercise 5
Length
Slope
Cross-section
Stream water
See Exercise 5
velocity
discharge
Chemical #1
Dissolved oxygen
See Exercise 6
pH
See Exercise 8
P0 4 3 -
See Exercise 7
N0 3 -
See Exercise 7
Alkalinity
See Exercise 8
Chemical #2
Dissolved organic carbon
See Exercise 9
Particulate matter
See below
Biological: Metabolism
Diurnal O 2 curve
See below
gross primary production
respiration
net primary production
One or more of the following options may be undertaken, depending upon the size of the class
and the amount of time to be allotted to this exercise. Nevertheless, the general physical
measurements (i.e., such as channel morphology, current velocity, and discharge) are common to
all options and must be completed. Thus, it might be advantageous to undertake the various
studies outlined in the options below on the same stream that was used in Exercise 5.