| Title |
The Dynamic of Phytoplankton Communities and the Biological Water Quality Assessment at three Artificial Weirs in Downstream of Namhan-river |
| Authors |
신현주 ( Hyun Joo Shin ) ; 이옥민 ( Ok Min Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2014.30.6.612 |
| Keywords |
Biological assessment; Namhan-river; Phytoplankton community; Water quality; Weirs |
| Abstract |
Physicochemical factors and the phytoplankton communities in the downstream area of Namhan-River were investigated from June 2012 to November 2013. We also assessed water quality using biological water quality indices. Total nitrogen was 2.4 mg/L, total phosphorus was 0.04 mg/L, and biological oxygen demand was 1.1 mg/L. This resulted in a level 2 (Ib, good) water quality rating. A total of 259 phytoplankton taxa were classified, consisting of 26 families, two subfamilies, 64 genera, 222 species, 32 varieties, and five formas. Bacillariophyceae dominated during a1l seasons and at all sites. The dominant species were Aulacoseira granulata, Cyclotella meneghiniana, C. stelligera, Melosira varians, Cocconeis placentula var. lineata, Nitzschia palea, N. amphibia, Cymbella minuta, and Achnanthes convergens. The diatom assemblage index for organic pollution values was level A?D, and TDI was level B?D. P-IBI at most sites was at the M (moderate) level, but TSI was at the E (eutrophic) level. Most indices dropped from upstream to downstream. |