Hongfeng Reservoir is located at Guizhou Province,which has the most widely distributed and the most complex types of karst.The reservoir is one of the sources for drinking water for Guiyang city.Besides,it has many other functions,such as agricultural irrigation,flood control,and tourism.Management of the eco-environment and water resources of this reservoir are important for sustainable development of this area.This study identifiedfunctional groups of phytoplankton to understand the distribution patterns...