Cyanophyta developed mainly
between April and August 2011 but
remained low (< 10%) since the beginning
of 2012. The main taxa did not
show a cyanotoxic potential (Chroococcus
sp. Nägeli, Merismopedia tenuissima
Lemmermann and Arthrospira sp.
(Gomont) Turpin). However, they
remain an indicator for high trophic status.
Annual trophic status (Tab. VII)
seems to indicate that the NT2 Reservoir’s
trophic status evolved from mesotrophic
(in 2009) to oligo-mesotrophic
(from 2010 to 2012).