2.5 Statistical methods
Principal Component Analysis (PCA)
was performed by using XLSTAT software
to establish the relationships
between abiotic variables (DOC, total phosphate, total nitrate, euphotic zone,
reservoir water level, rain and water
temperature) having the highest influence
on the phytoplankton community
(average total biomasses and average
cellular concentrations). For the ordination
analysis, we transformed the abiotic
and phytoplankton data by logx +1.