Phytoplankton Community Structure in Estuaries of Kemayungan-Linduk and Adjacent waters of Banten Bay, West Java, Indonesia Sulastri1 and Sulistiono2
1Research Center for Limnology, National Research and Innovation Agency, Republic of Indonesia, Jl. Raya Bogor-Jakarta, Km 46, Cibinong. Indonesia.
2Department of Aquatic Resources Management, Faculty of Fisheries
and Marine Sciences, IPB University (Bogor Agricultural University), Jl. Agatis Darmaga Bogor, Bogor 16680, Indonesia.
Abstract
Abstract. Surrounding area of Banten Bay is an urban area which make estuaries and coastal areas at the bay are very vulnerable to the pollution and sedimentation. This study aims to determine phytoplankton community structure in Kemayungan-Linduk estuaries and the adjacent waters of Banten Bay . Samples were collected at 6 stations in February to April 2021. The data included environmental factors, phytoplankton composition and abundance, species richness, diversity and evenness index. Water quality showed a high variability during observation. Low Transparency (20-47 Cm), turbidity (13-49 NTU, salinity (0 to 9 o/oo and TTS (39.5 to 134 mgL-1) and higher nitrate (concentration was recorded in Linduk estuary. Phytoplankton consisted of Chrysophyceae, Bacillariophyceae, Chlorophyceae, Cyanophyceae, Dinophyceae dan Euglenophyceae with Bacillariophyceae as a dominant group contributed 54.1 % to 100 % of total abundance. The highest percentage of Bacillariophyceae was recorded in coastal water and Estuary of Kemayungan River. Higher percentage of Cyanophyceae was recorded in Linduk Estuary while higher percentage of Euglenophyceae was recorded in Kemanyungan estuary. Phytoplankton abundance (743 to 35076 individualL-1), number of species (16 to 31), diversity index (0.83 to 2.93), species richness (1.32 to 4.39) and evenness ( 0.296 to 0.981) show a large heterogeneity across sampling site and sampling time. Low diversity index and species richness classified as moderately ecological stress was recorded in coastal waters of Kemanyungan estuary.
