Community Structure and Phytoplankton Abundance in Different Estuary in Coast Waters Lekok Pasuruan East Java

Abstract

The quality of water in estuary is influenced by human activities around it which can affect the sustainability of the life of the organisms in these waters and other living things that use it. The aim is to analyze the abundance of phytoplankton and the quality of the waters of the river estuaries with different land uses for ponds, settlements and mangroves. This study was conducted by using survey method and carried out April - May 2020. The results of the abundance of phytoplankton in the coastal waters of Lekok as a whole are 3543 - 7692 cells / ml which are classified into mesotrophic waters. The phytoplankton with the highest abundance was dominated by Ceratium sp, indicating this species as an indicator of polluted waters. The results of water quality in Lekok coastal waters such as temperature, pH, salinity, DO and TOM are suitable for the life of phytoplankton organisms and in accordance with sea water quality standards. Water quality that exceeds the quality standard for nitrate, orthophosphate and TSS is due to the presence of nutrients or organic matter from human activities in different land uses that enter the waters and river estuaries.