The macroinvertebrate community in the Singal reservoir, Yedang and Juam lake was investigated three times from April 2021 to October 2021. Each lake was investigated by dividing it into inflow, middleflow, and outflow. Additionally, sampling was conducted again by dividing it into the edge and center parts at each inflow, middle-flow, and outflow. Eight families of benthic macroinvertebrates were collected except for chironomids in the sampling sites. Dominant macroinvertebrates were investigated as chironomids, and Tubificidae was sub-dominant organisms. The density of macroinvertebrate community was higher in the edge area than in the center bottom of the lakes. The density of chironomids was low when the water level was high but was high when the water level was low. In the edge area of the middle-flow in Singal reservoir, the density of chironomids was 1,208 ind. m-2 in April when the water level was high, but it increased to 1,401 ind. m-2 in July when the water level was low. Similarly, the density of chironomids at the outflow of Yedang lake was high (1,990 ind. m-2) in July when the water level was low. The density of chironomids also decreased along with the increasing water level at all edge areas of Juam lake. These results indicated that it will be necessary to consider the water level when studying macroinvertebrate communities in the lake.

본 연구에서는 낙동강 수계의 농업용수로 활용되는 수심이 낮은 4개 저수지의 중앙과 연안에서 서식하는 동물플랑크톤 군집을 조사하였다. 4개 지역의 조사기간 동안 평균 동물플랑크톤 현존량은 저수지 중앙에서 477.5±312.4 ind. L-1로 높게 조사되었고, 저수지 중앙과 연안을 비교 시 유의한 차이를 보였다(Fig. 3, t=2.337, p