Phytoplankton communities as indicator of trophic state in some habitats of Batanghari River system in Sumatera Island, IndonesiaSulastri Sulastri, Reliana Lumbantoruan, Jojok Sudarso and Tedjo SukamtoBIO Web Conf., 156 (2025) 01005DOI: https://doi.org/10.1051/bioconf/202515601005