History of phytoplankton and total phosphorus concentrations between 1980 and 2008. (A) Annual mean ± SE biovolume of total phytoplankton, Planktothrix and concentration of total phosphorus in Lake Zürich from 1980 to 2008. Biovolume in mm3 L-1, determined by microscopic counting, total phosphorus in μg L-1. (B) Annual mean ± SE percentage of Planktothrix and chlorophyta out of total phytoplankton.
Ostermaier et al. BMC Biology 2012 10:100 doi:10.1186/1741-7007-10-100