Figure 4. - Simplified diagrams of the food web in the. sub-littoral
area (6-20 m deep) of Lake Victoria in the 1970s and in 1989
(Modified from Ligtvoet and Witte, 1991).
Another ‘example of a trophic cascade is provided
by the introduction of Oreochromis alcalicus grahanzi
-to Lake Nakuru. In this saline lake, previously
devoid of fish, the cichlid introduced in the 1950s
developed quickly, feeding on the high standing crop
of the cyanobacteria Spirulina platensis. All primary
consumers in the lake - Lesser Flamingos, fish