<![CDATA[The southern coastal ecosystem of Jember plays an important ecological role but is vulnerable to environmental pressures resulting from natural and anthropogenic activities. This study aimed to inventory mangrove and plankton communities and to analyze their relationships with water quality parameters as coastal bioindicators. Sampling was conducted using a purposive approach at six observation stations. Mangrove data were collected using transect methods, while plankton samples were obtained using a plankton net. Water quality parameters analyzed included temperature, pH, salinity, DO, and BOD, with relationships among variables assessed using Principal Component Analysis (PCA). The results showed that mangrove vegetation consisted of eight species belonging to four families, with Acanthaceae as the dominant family, while the plankton community was dominated by phytoplankton from the class Bacillariophyceae. PCA results indicated that Stations 3 and 6 were influenced by BOD, whereas mangrove and plankton distributions were more strongly correlated with salinity, pH, and DO. These findings demonstrate that the integration of mangrove and plankton communities is effective as a bioindicator of coastal water quality and provides a scientific basis for sustainable coastal ecosystem management.]]>
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