Article #64This paper provides a synthesis of current knowledge on phytoplankton production, seasonality,
and stratification in tropical African lakes and considers the effects of nutrient enrichment and the
potential impacts of climate warming on phytoplankton production and composition. Tropical
African lakes are especially sensitive to climate warming as they experience wide fluctuations in the
thermocline over a narrow range of high water temperatures. Recent climate warming has reduced
phytoplankton biomass and production in the lakes. A decline in the production of palatable
chlorophytes and an increase in cyanobacteria has led to reduced zooplankton production and a
consequent decline in fish stocks, all of which can be associated with the elevated water temperatures.
This indicates that even moderate climate warming may destabilise phytoplankton dynamics in
tropical African lakes, thereby reducing water quality and food resources for planktivorous fish,
with consequent negative impacts on human livelihoods
