| Title |
Interaction between Water Quality and Substrate on Benthic Macroinvertebrates Index (BMI) |
| Authors |
이효주 ( Hyoju Lee ) ; 공동수 ( Dongsoo Kong ) |
| DOI |
https://doi.org/10.15681/KSWE.2023.39.4.261 |
| Keywords |
Benthic macroinvertebrates; Benthic Macroinvertebrates Index; BMI; Biological assessment; Streambed substrate; Water quality |
| Abstract |
The benthic macroinvertebrates index (BMI) was developed based on the 5-day biochemical oxygen demand (BOD5), which is the amount of biodegradable organic matter in stream water. However, benthic macroinvertebrates mainly live in the streambed substrate and are affected by the interaction of water quality and substrate. This study was conducted to examine the interactive relationship between water quality items (BOD5, total phosphorus (TP), total suspended solids (TSS)) and substrate with BMI by performing statistical analyses (four-way analysis of variance, Pearson’s correlation analysis, partial correlation analysis and multiple regression analysis). The data used in the analyses were collected from 19,915 sampling units at 1,937 sites in South Korea from 2010 to 2020. The interaction effect between BOD5 and substrate types was confirmed through a four-way analysis of variance. Partial correlation analysis and multiple regression analysis estimated the degree of influence on the change in BMI value in the order of mean grain size of the substrate as (Φm) > BOD5 > TP > TSS. BMI can be regarded as an index that evaluates the comprehensive effects of water quality and streambed status, although it is an index that was developed based on the amount of biodegradable organic matter in a water column. |