Mangrove ecosystem conditions in Batu Bara district (case study in Lima Puluh Pesisir, Talawi and Tanjung Tiram sub-district)Rumondang Rumondang, Feli Feliatra, Trisla Warningsih and Dessy YoswatiBIO Web Conf., 74 (2023) 04010DOI: https://doi.org/10.1051/bioconf/20237404010