How do droughts affect small shallow lakes such as Lake Nakuru and Lake Chilwa?

Small, shallow lakes in East Africa are highly sensitive to climatic fluctuations, and the effects of drought are significantly amplified in these systems. Because these lakes often have limited depth and volume, they lack the buffering capacity of larger water bodies, making them prone to drastic reductions in surface area or even complete desiccation during dry periods.1

Historical examples illustrate this vulnerability:
* Lake Nakuru in Kenya dried up completely during the 1939–40 period.1
* Lake Rukwa was reduced to approximately one-fifth of its normal size by the end of 1949.1
* Lake Chilwa in Malawi experienced a drastic reduction in its surface area during 1967–68.1

These fluctuations are driven by the hydrologic balance of the lakes, where high rates of evaporation in hot, dry environments—combined with reduced precipitation—outpace water input. As these lakes shrink, their waters often become increasingly saline, which can have profound impacts on the local wetland environment and the flora and fauna that depend on them.123