306
J. Bobbin . F. Recknagel
findings of Reynolds (1984) and Shapiro (1990) suggesting that blue-green algae
such as Microcystis and Anabaena continue to grow above pH values of 9.5 while
green-algae and diatoms become inhibited and cease growth at these pH levels.
Harris (1986) assumes that the tolerance of high pH values by blue-green algae
gives them a competitive advantage over other algal groups and may explain their
tendency to late summer blooms in eutrophie waters. Even though it is very
difficult to prove this assumption by field experiments (Harris 1986) the rulesets
produced by the evolutionary approach certainly support this finding.
1
P04 E (76.4, 193)
132
FILAMENT=O .164
S-DEPTH
2 E (-00,90.12)
1803
FILAMENT=0.164
L
"""
S-DEPTH
pR (-00,8.577)
8 (90.12, (0)
945
3 N03:P04 (-00,24.07) 213
FILAMENT=0.164
FILAMENT=O .164
/'
"'WTEMP
P04
5 (19.5,20.9)
93
4 (14.6,193)
108
FILAMENT=76,800
FILAMENT=76,800
DO (-00,9.196)
6 N03 (-00,595.9)
132
FILAMENT=0.164
I
P04 (-00, 14.6)
7 N03 (-00,595.9)
761
FILAMENT=76,800
Figure 15.11. A typical rule set for the prediction of filamentous algae.