earticle

영어

This study investigated the relationship between benthic macroinvertebrate communities and physicochemical factors in the Micheon Stream, Andong. Three surveys were conducted in 2020. Water temperature ranged from 19.5 to 24.3℃, pH from 7.77 to 8.23, and dissolved oxygen (DO) from 7.87 to 8.77 mg·L⁻¹, indicating generally good water quality. A total of 121 species (47,286.5 inds./㎡) belonging to 61 families and 20 orders were identified. The EPT group (Ephemeroptera, Plecoptera, Trichoptera) comprised 35 species (28.9%) and 27,495.8 inds./㎡ (58.2%), while the OCH group (Odonata, Coleoptera, Hemiptera) accounted for 48 species (39.8%) and 6,500.2 inds./㎡ (13.7%). Community indices showed a mean dominance index (DI) of 0.48, diversity index (H′) of 3.23, richness index (R₁) of 3.23, and evenness index (J′) of 0.70. Predators were the most species-rich feeding group, and clingers were dominant in habitat groups. The TESB index averaged 122, corresponding to water quality grade Ⅰa (“very good”). Similarity and correlation analyses showed that St.1 and St.2 displayed similar patterns, while St.4 showed distinct community differences from other sites. pH and EC were identified as significant environmental factors influencing community composition.