Evolution of water quality and biota in the Panjiakou Reservoir, China as a consequence of social and economic development: implications for synergies and trade-offs between Sustainable Development Goals

Water shortages caused by poor water quality severely affect the sustainable social and economic development of Tianjin City Tangshan in China. The Panjiakou Reservoir is located Luanhe River mainstream provides to public both cities since 1983. evolution aquatic community structure interactions with its surroundings (Tangshan Chengde City) were analyzed. relations between these changes various interrelated Sustainable Development Goals (SDGs) also evaluated. From 1984 2019, overall trend total nitrogen (TN), phosphorus (TP), chemical oxygen demand (CODMn), ammonia (NH3-N) concentrations first increased then decreased growth. organisms strong ecological adaptability pollution resistance became dominant species community. These included chlorophyta, cyanophyta bacillariophyta among phytoplankton, copepods zooplankton, tubificidae chironomidae zoobenthos. completion satisfied as well benefited surroundings. However, high levels pollutants produced cage fish culture, mineral processing, tourism threatened environment, which would turn harm society economy. Therefore, cages removed other environmental protection measures implemented ensure safety drinking water. This study demonstrated that considering comprehensively individual needs inside across catchments minimize trade-offs maximize synergies was great significance for coordinating society, economy, resources achieve at sub-national scale.