1. Lake Victoria East Africa Introduce aspects of the ecology and management of Lake Victoria with special emphasis on changes in its endemic fish fauna.

2. Mean depth = 40m Maximum depth = 79m Surface area = 68,000 km 2 Altitude = 1,134m Shoreline development index = 3. 7

3. Basin size = 263,000 km 2 Population = 27.7 million

4. Start of the rainy season (cool/windy)

5. Lake Victoria – water hyacinth Eichhornia crassipes Lake Victoria – papyrus Cyperus papyrus

6. Source: Bootsma and Hecky 1993

7. Source: Verschuren et al. 2002. History and timing of human impact on lake Victoria. Proc. Royal Society London 269: 289-294 Core taken in 1996 from a depth of 68m Discontinuity near 25cm depth in the core represents a hiatus of ca. 40 years (stippled zone) Note: Increasing abundance of diatoms starting in the 1960s but decrease again in the 1980s. Diatoms replace by bloom-forming cyanobacteria

8. Anabaena Cyanobacteria bloom Microcystis

9. Haplochromine cichlids

12. Lake Victoria food web prior to the introduction of the Nile perch [Haplochromids in black]

13. Lake Victoria food web following the introduction of the Nile perch

14. Witte et al. 1992

16. Goudswaard et al. 2008