Anthropogenic activities, water quality and phytoplankton diversity in Lake Calibato, San Pablo and Rizal, Laguna [Philippines]
2018
Chua, Z.R.C. | Dalisay, M.G.S.
The study aimed to contribute to the monitoring research of freshwater ecosystem by identifying the anthropogenic activities, water quality and phytoplankton diversity during the months of July to November 2016. The study area is Lake Calibato, a small crater lake in transboundary of San Pablo; Rizal, Laguna [Philippines] and one of the famous seven lakes of San Pablo. The lake is the deepest among the seven lakes and has been heavily used for economic resource that functions as aquacultures. The presence of informal settlers and illegal fish cages largely affect the quality of Lake Calibato. Nonexistence of development for tourism and usual monitoring in the Lake affected the lifestyle and economic stature of the community. The physiochemical parameters of water were measured in terms of pH, Temperature, water transparency, dissolved oxygen, biological oxygen demand (BOD), nitrate, phosphate, total dissolved solids (TSS), total suspended solids, and bacteriological properties of water (total coliform). Diversity of phytoplankton was assessed using Shannon-Weiner Index and Simpson Index. BOD, Phosphate and Nitrate exceeded the standard limit of DENR while the rest of the parameters (DO, pH, temperature, water transparency, TDS) are within the limits. There are 19 species of phytoplankton identified during the sampling period. General assessment of the anthropogenic activities is recommended. Community awareness in the Lake should also be monitored for the improvement and development of the area that is in need of the support of the related agencies and stakeholders.
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