Spatial Distribution of Phytoplankton in Jatigede Reservoir, West Java, Indonesia

Jatigede Reservoir has water input from the Cimanuk River. This river has gone through several anthropogenic activities that can affect its waters. Changes in conditions can occur due to changes in ecosystems carried out by several ecological aspects, one of which is the distribution of biota structures. The purpose of this study is to map the distribution of phytoplankton through spatial distribution both horizontally and vertically at the Jatigede Reservoir, West Java. The study began in July 2019 until September 2019. This research uses survey method. Sampling was carried out at 4 stations on the surface, half of the compensation depth, and compensation depth. The water parameters analyzed are transparency, temperature, depth, current, pH, CO2, BOD, DO, NO3-, PO43-, NH3, fitoplankton abundance, diversity index and dominance index. The results showed that 49 genera from 11 classes and 5 phyla were identified. Diversity index during the study reached between 0.904-2.062 and the dominance index was in the range of 0.267-0.681. The highest phytoplankton composition at each station and depth was found in the Bacillariophyceae class as much as 59.65% with an average abundance of 5523 ind/L.11 phytoplankton classes found during the study were identified at all observation stations, except in the eustigmatophyceae and mediophyceae classes.