ANALISIS KELIMPAHAN FITOPLANKTON BERDASARKAN KETERSEDIAAN NUTRIEN DI RANU GRATI DENGAN GENERALIZED POISSON REGRESSION

Abstract

Phytoplankton are aquatic organisms that play an important role in aquatic ecosystems because they are the main producers of the food web. Phytoplankton growth is highly dependent on the availability of nutrients (nitrates and phosphates) in the waters. Ranu Grati is a volcanic lake located in East Java which is widely used by the community for various activities. These activities generally produce organic matter which will affect the concentration of nitrate and phosphate as well as affect the structure of phytoplankton communities in lake. This study aimed to model the relationship between phytoplankton abundance and nutrient availability and to predict the composition of phytoplankton by division to determine the community structure using the Generalized Linear Regression approach. The analysis showed that the nutrient that had a significant effect on the number of phytoplankton observed was the concentration of phosphate, while the abundance of phytoplankton in Ranu Grati tended to be dominated by phytoplankton from the Chlorophyta division.