In order to understand the environmental factors affecting the waterbird community in winter, we divided the watershed
into 6 sections and investigated the size of the stream, the water quality, benthic invertebrates, and fish including birds.
The influences on the community of water birds in Wonju stream were river structure, temperature and water quality.
Among the structure of the river, the factors affecting the waterbird community in winter were the width of the stream
and the width of the flowing water. The wider the width, the more species and the number of the winter waterbirds were.
As the width of river water was wide, the smaller the width and width of the waterway, the fewer the population. The
temperature changes of the wintering season affected the community of water birds because it led to freezing of rivers.
The sections that were not frozen showed a significant increase and decrease in the temperature drop and rise. The values
of pH, water temperature, COD, BOD, TN, TP and total E. coli increased with the increase of the downstream waterbirds
population in the water quality survey. The water quality of S6 was affected by the downstream sewage treatment plant
The number of wintering waterbirds was also highest. The effluent from the sewage treatment plant seems to have a
considerable influence on the water quality. The increase of several items such as TN promotes the nutrition of the river,
which leads to the accumulation of organic matter and the proliferation of aquatic organisms. This may be the cause of
the increase in winter waterbirds as a food source. The benthic macroinvertebrate communities and fish communities did
not show any correlation with the wintering water-birds communities.