Effect of Gated Weir Opening on the Topography and Zooplankton Community of Geum River, South Korea

Hydrological changes affect not only the physicochemical factors and habitat structure of river ecosystems, but also biological communities sensitive to environmental changes, such as zooplankton. In this study, we investigate effects weir opening on variables topographic structures at Sejong Weir in South Korea monitor resulting distribution zooplankton community. led increased dissolved oxygen decreased conductivity, turbidity, chlorophyll a, total phosphorus, nitrogen diversity (reduced pool area increase riffle grassland/bare land areas) section downstream Weir. Prior (2015–2016), cladoceran community was dominated by Chydrous spaeericus Moina microcopa. After (2018–2019), abundance other Bosmina groups (Bosmina longiseta, fatalis, Bosminopsis deitersi), Ceriodaphnia sp., Daphnia obtusa increased. contrast, copepod species (Cyclops vicinus Mesocyclops leukarti) were abundant before opening. We conclude that artificial helped maintain unique characteristics ecosystem terms continuity a different composition new environment.