Lake Malawi's Rocky Shores (image) Brown University Share Print E-Mail Caption The water depth of Lake Malawi has fluctuated during the last 800,000 years. When its deep, there are more rocky shoreline habitats. Those niches could have driven the evolution of distinct cichlid species. Credit Andrew Cohen / University of Arizona Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.