Box 15.2 (continued)
(continued)
Box 15.2 (continued)
(continued)
Nitrogen limitation
0
25
50
75
100
EXPERIMENT 1: Non growth-limiting conditions
T°=20°C, light = 60 μmol photons m
-2 s
-1
Nitrogen : Non limiting
EXPERIMENT 2: Growth-limiting conditions
Temperature and light limitation: T°=10°C, light = 10 μmol photons m
-2
s
-1
or
Nitrogen limitation (N/100, N=0)
0
25
50
75
100
0
25
50
75
100
Beginning
of the experiments (T0)
End of the experiments in
non growth-limiting conditions
End of the experiments
Temperature and light limitations
Addition
of
Nitrogen
Non-MC-producing
strain (NCTC)
MC-producing
strain (TC)
NTC1/TC1
NTC1/TC2
NTC1/TC3
NTC2/TC1
NTC2/TC2
NTC2/TC3
NTC1/TC1
NTC1/TC2
NTC1/TC3
NTC2/TC1
NTC2/TC2
NTC2/TC3
NTC1/TC1
NTC1/TC1
NTC1/TC1
NTC1/TC1
No more limitation
Box Fig. 15.4 Co-culture experiments among several strains of Planktothrix agardhii producing or nonproducing microcystins under
different environmental conditions (From Briand et al. 2008)
Box Fig. 15.3 Chemical
structures of microcystins (a);
cylindrospermopsin (b);
anatoxin-a (c); lyngbyatoxin-a (d)
15 Environmental and Human Pathogenic Microorganisms
627