Thespecies belonging to Cryptophyta
were also found during the CD season
and thus increased the trophic status during
limited periods of time. These species
were especially abundant early 2009
reaching 16% of relative biomass in April
and in September. Since 2010, their contribution
to the total biomass increased
and reached a maximum of 20% in January
and in July 2012.
Due to Chlorophyta taxa (including
filamentous and Desmids), green algae
reached more than 60% of the total biomasses
regardless of the year or the
month (Fig. 5) – e.g. Monoraphidium
spp. Komárková-Legnerová, Ankistrodesmus
spp. Corda, Tetraedron caudatum
(Corda) Hansgrig, Closterium limneticum
Lemmermann, Staurastrum sp.
(Ralfs) Meyen, Staurodesmus Teiling.
Since 2010 other dominant genera
appeared into the assemblages with
seasonal variations, such as those belonging to the group of Desmids.
They generally occurred at the top of
phytoplanktonic production from May to
June. These algae confirm the mesotrophic
status of the NT2 Reservoir
during WD season.