Diversity and Abundance of Microalgae in the Jumpinang River Pasuruan Regency East Java

Abstract

The Jumpinang River originates from several water sources on the slopes of Mount Arjuna, Pasuruan Regency. Rivers are a habitat for various microscopic and macroscopic organisms on land, including microalgae. Microalgae is a type of algae that is microscopic, single-celled, and capable of photosynthesis. This research analyzes the diversity and abundance of microalgae in the Jumpinang River, Pasuruan Regency, East Java. The type of research used is survey research, collecting data by observation. Water conditions in the Jumpinang River have optimal value for the development and growth of microalgae. The average temperature value is 27.0°C, Dissolved Oxygen 36.6 mg/l, pH 7.33, current speed 0.6 m/s, and brightness 97 cm. The composition of microalgae types in the Jumpinang River was found to be 15 genera from 6 classes, namely Cyanophyceae, Zygnematophyceae, Trebouxiophyceae, Ulvophyceae, Chlorophyceae, and Bacillariophyceae. 15 genera, namely Merismopedia Spirogyra Actinastrum Ulothrix Rhizoclonium Chlorococcum Ankistrodesmus Gomphonema Cymbella Fragilaria Synedra Gyrosigma Navicula Cocconeis and Nitzsch. The microalgae diversity index in the Jumpinang River is classified as moderate, with an average value from three observation stations of 2.366 (H'). The Jumpinang River microalgae abundance index is classified as fertile with a value of 35,506.33 cells/L with a high fertility level.