Abstract

A brief historical (1956-2014) review of the Lake Victoria ecological development is presented. The Lake Victoria ecosystem structure was thoroughly modified after the invasion of the predator fish Lates niloticus (Nile perch). The relative capacity and functional activity of the food-web compartments was quantitative and qualitative altered. The trophic status of Lake Victoria ecosystem was shifted toward eutrophication : phytoplankton species composition and densities were modified, fish assemblages were converted from about 400 Haplochromine species diversity to large body predator , Nile perch dominance. Consequently , the fishery was changed accompanied by Socio-Economic consequences. The thermal structure trait shifted towards enhancement of anoxia and Hypolimnetic volume extension.

Highlights

  • The dramatic changes resulted by the introduction of Nile Perch (1954) and the massive species extinction of Haplochromines include many aspects of limnological features especially fishery harvest composition (Table 2)

  • The Haplochromine community in Lake Victoria comprises of approximately 400 species encompassing remarkable wide trophic spectrum

  • Major ecosystem modification in Lake Victoria after the 1960’s induced by the Nile Perch invasion and environmental pollution led to the elimination of the native fish species of Haplochromines and Tilapias and prominent increase of the exotic Nile

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Summary

INTRODUCTION

Lake Victoria is the second-largest lake (excl. Caspian Sea) in the world by surface area and 7th by Volume: Maximum Length-337 km and Maximum Breadth-250 km.

Residence Time m
ECOSYSTEM STRUCTURE MODIFICATIONS
Phytoplankton and Zooplankton
Diatoms Algal dominance
Temperature Range
STRATIFICATION STABILITY
THE DRAINAGE BASIN
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