The information on changes in total phosphorus and total nitrogen concentrations of lake in response to variations of different nutrients loading is critical for the selection of an appropriate lake management strategy. This study aimed to evaluate the influence of internal and external nutrients loading in controlling in-lake nutrient concentrations in a shallow lake system. This study was conducted in Slim River Lake for 12 months to quantify internal, external total phosphorus and total nitrogen loading, and in-lake total phosphorus and total nitrogen concentrations. Total phosphorus and total nitrogen in storm water and grab water samples were quantified using ascorbic acid and hydrazine reduction method. Study results indicated that internal total phosphorus and total nitrogen loading fluctuated from 150.17 kg to 7,538.33 kg and 2.72 kg to 42.23 kg, respectively, thus suggesting the significant sediment phosphorus and nitrogen released into the water column. Mobilization of nutrie.....

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Cyanobacterial bloom is a serious threat to the safety of public drinking water resources due to potential cyanotoxin microcystin contamination. Water operators inadequately monitor occurrences and dynamics of cyanobacterial blooms and their toxic potential. An effective monitoring and risk assessment can be challenging as the commonly used cyanobacterial biomass indicator might not explain the actual bloom_s toxicity. This study aimed to determine a reliable cyanobacterial biomass indicator for monitoring toxigenic blooms in the reservoir used for public drinking water supply. The reservoir was sampled for 12 months at three sampling sites to determine its water physicochemical properties, cyanobacterial biomass abundance, and toxigenic potential estimated by mcyE gene copy numbers. Cyanobacterial biomass was quantified as total chlorophyll-a and blue-green algae phycocyanin (BGA-PC). The results showed that total chlorophyll-a and BGA-PC are highly variable on temporal and spatial sc.....

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