The composition and abundance of phytoplankton in the waters are strongly influenced by the supply of phosphorus and light intensity, so observations were made to obtain the optimum phosphorus concentration with a certain level of light which caused the high abundance of phytoplankton in Lake Cikaret. A 2 x 2 factorial design was used to see the effect of three levels of phosphorus (0.03 mg/L, 0.09 mg/L, and 0.15 mg/L) and three levels of light (30%, 70% and 100% luminance). on the abundance and composition of phytoplankton. The parameters observed were the abundance and composition of phytoplankton, dissolved oxygen, pH, temperature, turbidity, light intensity, and total phosphorus. The results showed that the addition of phosphorus in the waters increased the abundance of phytoplankton. Chlorophyta was high in the first week, then Bacillariophyta and Chlorophyta were high in the second week until the end of the observation. Synedra sp. (Bacillariophyta) tended to be high in abundance at a low light intensity, while Mougeotia sp. (Chlorophyta) tend to be high at all light intensities.

The Telaga Wama Natural Reserve (CATWA) at Bogor Regency, West Java Province is a biodiversity conservation area, however, the changed of some of the area's functions into a Nature Tourism Park can affect the quality of its ecosystem. One approach to evaluate ecosystem quality is through the analysis of Anura species diversity. The continuity of the Anuras eggs and larvae is influenced by the presence of pollutants in the waters. The availability of Anura species diversity database can be an indication of the aquatic ecosystem quality at CATWA. This research was conducted using the Visual Encounter Survey method at five sampling locations in CATWA, namely river, lake, swamp, forest pond, and waterfall. Observations of tadpoles were carried out twice a week, for four weeks, accompanied by physical-chemical measurements of the waters, namely DO, BOD, COD, temperature, pH, depth, and turbidity. The Anura diversity database is made up of a time series, combining of this study result, and previous reports. This study had identified 10 species of tadpoles from six Anura families, namely Dicroglossidae, Megophyridae, Ranidae, Bufonidae, Rhachoporidae and Microhylidae. The level of species diversity is moderate (H'=2.29). Turbidity and water temperature have the highest correlation with species diversity. The water quality in CATWA was relatively good, and able to support the life of Anura. This is also evidenced by the presence of species representatives from all Anura families in Java Island.