Saprobic plankton index as bioindicator determines pollution status in Green Canyon River, Pangandaran, Indonesia

Rivers generally have pollution potential, which from industrial waste, domestic waste or high human activities, especially in rivers designated as tourist destinations, such as along the Green Canyon River which is used as a research location. The purpose of this research was to determine the level of pollution along the Green Canyon River, Pangandaran. This research focuses on the saprobic index method using plankton as a group composer of saprobic waters which is become a pollution indicator. This research was conducted from September up to November 2018. Sampling was taken at five different stations. The results of this research indicate that the saprobic value of the index along the Green Canyon River, Pangandaran River ranges from 1.0 to 1.5 which indicates that waters are being in very low pollution up to low pollution. The lowest saprobic index value was found at station 4 with the use of the mangrove area and the highest saprobic index value was found at station 2 which was the first brackish point that dominated with forest and far from residential settlements. Identified plankton consists of 8 genera of phytoplankton and 2 genera of zooplankton with abundance until 2495 individual/L. The average of diversity index in range 0.99-1.02 with an average of dominance in range 0.103-0.121.