The results of CCA to fid the relationship between physico-chemical and biological variable as well as the dominant species of phytoplankton were shown in Figures 6 and 7. At sampling sites 1 and 2, C. raciborskii, P. limnetica and T. volvocina had a positive correlation with soluble reactive phosphorus (SRP). Similar report on this correlation also found by Burkholder et al. (2008), Pooarlai
(1999) and Malaiwan (2010) who found that C. raciborskii showed a positive correlation with soluble reactive phosphorus in the water because phosphorus is main nutrient phytoplankton require to thrive. It functions as one of the major players in the process of photosynthesis, nutrient transport and energy transfer. Phosphorus also effects the phytoplankton’s structure at a cellular level
(Clark et al., 1977). And according to Sommer (1989) reported that these phytoplankton need to use high amounts of phosphorus for growth. Therefore, the amount of these species increased with relation to higher soluble reactive phosphorus in the water. In addition, P. cunningtonii was found to have a positive correlation with NO 3-N at sampling site 2. Those species can use nitrate-nitrogen for growth, which nitrogen is essential for phytoplankton to synthesis amino acid of proteins and
nucleic acids (Darley, 1982).