Estimation of phytoplankton carbon content in Jatigede Reservoir, Sumedang, West Java

Abstract

Jatigede Reservoir is stagnant inland water formed from the damming of the Cimanuk river. Jatigede Reservoir, like any other reservoir, is horizontally divided into three areas, namely riverine, transition, and lacustrine. The different characteristics of each zone also impact the composition and community of phytoplankton, trophic status, and carbon content. This study aims to calculate the carbon content of phytoplankton in the waters of the Jatigede Reservoir in each zone with the composition and community of phytoplankton at a certain trophic status. The research stations were selected using purposive sampling with station selection based on the site in the reservoir, namely riverine, transition, and lacustrine. Analysis of trophic status and carbon content was used to determine the condition and presence of carbon in the Jatiged Reservoir. The trophic position of the Jatigede Reservoir based on the Nygaard Index and TSI (Tropic State Index) is categorized into the eutrophic level. Species from the Cyanophyceae class tend to have high abundances, but the higher carbon content is in the Dinophyceae class. Riverin, transitional, and lacustrine zoning have the same trophic status but have different compositions and phytoplankton communities. Based on the study results, the carbon content of phytoplankton was relatively high in the riverine and lacustrine zones and low in the transition zone.