Fig. 2: Temporal distribution of two filamentous cyanobacteria (log10(1 + N), unit: cells L−1) from 2011 to 2015 separated into seasonal and long-term trends by generalized additive models.

a Seasonal variation of Planktothrix. b Inter-annual dynamics of Planktothrix from 2011 to 2015. c Seasonal variations of Pseudanabaena. d Inter-annual dynamics of Pseudanabaena from 2011 to 2015. Shaded areas represent 95% confidence intervals.