Autoecology of Ceratium furca and Chaetoceros didymus as potential harmful algal blooms in tourism and aquaculture sites at Teluk Pandan Bay, Lampung, Indonesia

Abstract. Hasani Q, Yusup MW, Caesario R, Julian D, Muhtadi A. 2022. Autoecology of Ceratium furca and Chaetoceros didymus as potential harmful algal blooms in tourism aquaculture sites at Teluk Pandan Bay, Lampung, Indonesia. Biodiversitas 23: 5670-5680. Harmful (HABs) phenomenon has been observed around Waters, Lampung Bay. The dominant HABs found waters were didymus. This study aimed to analyze the relationship between environmental physicochemical factors abundance C. HABs. Phytoplankton samples collected from four stations (Hurun Sidodadi Coastal Sari Ringgung Beach Cikunyinyi Bay) during May-August Physical parameters (temperature, depth, brightness, current velocity salinity), well chemical (dissolved oxygen, pH, phosphate, nitrite, nitrate ammonia) all measured conjunction with phytoplankton sampling. Canonical correlation analysis multiple regression used predict effect on density. Blooms highest density 5.417×106 cells/L Cikunyiyi while predominated Hurun Bay (2.890×104 cells/L), Waters (3.923×104 cells/L) (3.531×104 cells/L). main influencing increase population phosphate nitrate. was affected by influenced Beach. Potentially be higher near intensive shrimp farming sites. use fertilizer artificial feed high quantities is thought responsible for increased water eutrophication. Periodic monitoring consistent determination carrying capacity activities are required control ensure sustainability Waters.