The study aims to assess the spatial distribution of benthic macroinvertebrate communities
in response to the surrounding environmental factors related to land use and water quality. A total
of 124 sites were surveyed at the Seomjin River basin in May and September 2017, respectively.
We evaluated the abundance and composition of benthic macroinvertebrate communities based on
nine subwatersheds. Subsequently, we compared the benthic information with the corresponding
land use and water quality. To comprehensively explore the spatiotemporal distinction of benthic
macroinvertebrate communities associated with those ambient conditions, we applied canonical
correspondence analysis (CCA). The CCA results explicitly accounted for 61% of the explanatory
variability; the first axis (45.5%) was related to land-use factors, and the second axis (15.5%) was
related to water quality. As a result, the groups of benthic communities were distinctly characterized
in relation to these two factors. It was found that land-use information is primarily an ecient
proxy of ambient water quality conditions to determine benthic macroinvertebrates, such as Asellus
spp., Gammarus spp., and Simulium spp. in a stream ecosystem. We also found that specific benthic
families or genera within the same groups (Coleoptera, Diptera, Ephemeroptera, and Trichoptera)
are also di erentiated from ambient water quality changes as a secondary component. In particular,
the latter pattern appeared to be closely associated with the impact of summer rainfall on the benthic
community changes. Our study sheds light upon projecting benthic community structure in response
to changes of land use and water quality. Finally, we conclude that easily accessible information,
such as land-use data, aids in e ectively characterizing the distribution of benthic macroinvertebrates,
and thus enables us to rapidly assess stream health and integrity.
