Environmental Engineering Reference
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10
-1
10
0
10
1
10
2
A
1
Oligotrophic Lake
2
3
4
5
6
7
B
1
Mesotrophic Lake
2
3
4
5
6
7
C
1
Eutrophic Lake
2
3
4
5
6
7
FIGURE 3.9
Light transmission as a function of color for an oligotrophic lake (Waldo Lake,
1984; A), a mesotrophic lake (Munsel Lake, 1984; B), and a eutrophic lake, Oregon (Siltcoos
Lake, 1983; C) (R. W. Castenholz, unpublished data).
g L
-1
)
Chlorophyll a (
0 0 0 0 0 0 0
0
1
Chlorophyll
Light
2
3
4
5
6
7
8
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
3
Light (
mol quanta m
-2
s
-1
)
FIGURE 3.10
Profiles of chlorophyll
a
concentration and light with depth at Pottawatomie
State Fishing Lake No. 2, Kansas. The deep chlorophyll peaks are due to the presence of large
populations of cyanobacteria
(Oscillatoria).
The high biomass of algae occurs in a region with
1-0.001% of surface sunlight. Also, note how the attenuation of light increases (shallower
slope of the light curve) because of the dense algal populations.
43
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