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Freshwater algae are diverse group of organisms which impart important a functions in the ecosystem pertaining to water quality. Cultured freshwater algae were used to determine the effects of nitrogen in different levels on the pigment composition, , and total carotenoids. A three-month study chlorophyll a chlorophyll b of some physico-chemical properties of Palhi River as well as pigment content of freshwater algae conducted to find correlations on the different parameters was with that of the pigment concentration. Results of the study showed a strong positive correlation between chlorophyll a and nitrogen level, yet a weak correlation with and total carotenoids on chlorophyll b cultured freshwater algae. oth pH (6.06-6.92) and total dissolved solids (249-397 B ppm) are within the standard limits set by DENR, WHO and of Palhi river USEPA. However, the average total suspended solids (63.0 ppm) and total nitrogen (10.3 ppm) exceeded that of the tolerable limits set by national and international standards. he pigment composition of the freshwater algae showed T a strong negative correlation with the nitrogen level in Palhi River which could be attributed to the dynamics, biodiversity and complexities of the river system.

Pigmental Composition at of Freshwater Algae Different Levels of Nitrogen and Physicochemical Parameters of Palhi River, Baybay, Leyte