LIMNOLOGICAL STUDIES OF KAKLUK LAKE 
427 
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Figure 3.— Vertical distribution 
A, Diaptomus; B, Cyclops; C, nauplii; D, Cladocera; E, Rotifera; F, green algae; 0, diatoms 
These diagrams 
show that Diapto- 
mus, nauplii and 
Cladocera were 
most abundant in 
the upper 40 to 50 
meters of water; 
Cyclops was more 
uniformly distrib- 
uted from surface 
to bottom, but Fig- 
ure 6 shows a more 
marked difference 
between the upper 
and lower strata 
than the other 
three figures. A rel- 
atively small num- 
ber of nauplii are 
shown in Figure 5 
and they are rather 
evenly distributed 
from surface to bottom; larger numbers are represented in Figures 3, 4, and 6, and 
they are more abundant in the upper strata 
in these cases. The Eotifera have been 
omitted from Figure 4 and they are repre- 
sented only by a comparatively small num- 
ber in Figure 3; they are present in con- 
siderable numbers in Figures 5 and 6, the 
largest numbers being found in the upper 
strata. 
Figures 3, 5, and 6 bring out clearly the 
fact that the algae were most abundant in 
the upper 20 meters, but there were large 
numbers of green algae and diatoms below 
this depth as shown in Figures 3 and 5. At- 
tention may be called to the maximum of 
blue-green algae in the 10-20-meter stratum 
in Figure 5 and to the marked decline in 
the number of green algae in the 5-10-meter 
stratum in Figure 5; similar decreases are 
shown for the diatoms in the 15-20-meter 
stratum of Figure 3 and in the 10-1 5-meter 
stratum of Figure 5. 
For purposes of comparison with the 
results obtained at station 1 several verti- 
figure 4 . — Vertical distribution of zooplankton in Kariuk cal senes of catches were taken at station 2 
Lake, station l, September 8, 1929. a, Diaptomus; b, located in The Thumb Basin which has a 
Cyclops; C, nauplii; D, Cladocera. Note the large number . , _ . 
of nauplii in the upper stratum DI&X1I1111I11 QBptll Ol 46 H16t6rSJ tllG S6I*16S 
