During summers phytoplankton are dominated by cyanobacteria and occasionally diatoms, most commonly Aphanizomenon cf gracile but also Pseudanabaena limnetica, Planktolyngbya sp. and various species of Anabaena, of whom only Aphanizomenon is potentially poisonous and Anabaena frequently causes algal bloom.
In the context of summer phytoplankton communities, cyanobacteria usually hold sway, occasionally supplemented by diatoms such as Aphanizomenon cf gracile, Pseudanabaena limnetica, Planktolyngbya sp., and various Anabaena species. Notably, only Aphanizomenon poses a potential threat, while Anabaena frequently leads to algal blooms.