Do the regular annual extreme water level changes affect the seasonal appearance of Anabaena in Poyang Lake?

摘要

BackgroundPoyang Lake is an ecosystem experiencing annual variations in water level of up to 14 m. Water level changes were 8.03 and 11.22 m, respectively, in the years 2013 and 2014. The biomass and heterocyst frequency of Anabaena increased in the summers of recent years.