| Title |
Seasonal Variation of the Phytoplankton Community and Physico chemical Factors of Dong stream in Jeollanam-do |
| Authors |
김용진 ( Yong Jin Kim ) ; 신현주 ( Hyun Joo Shin ) ; 이옥민 ( Ok Min Lee ) |
| Keywords |
Dominant species; Eutrophication; Indicators; Phytoplankton |
| Abstract |
This study investigated the physio chemical water quality and the standing crop of the phytoplankton of Dong stream in Jeollanam do from May 2010 to Feb 2011. The indicators and the dominant species of phytoplankton were also measured to investigate the water quality of estuary. Nutrients turned out to be eutrophic to hypertrophic in most sites with total nitrogen ranging 1.023~10.743 mg/L and total phosphorous ranging 0.0182~1.6848 mg/L. The site D6 had the highest BOD ranging 0.6~7.5 mg/L. Total of 205 taxa appeared within the research period, Bacillariophyceae being the highest number of taxa. The appeared specoes were taxa resistant to pollution including Navicula pupula, N. subminuscula, Nitzschia amphibian and N. palea. The downstream is thought to be greatly affected by the ocean water since marine and estuary phytoplankton such as Skeletonema costatum. Coscinodiscus radiatus, Bacteriastrum dlicatulum and Eucampia biconcave appeared. Diatom appeared mainly as dominant species including Cymbella minuta, Melosira varians, Gomphonema parvulum, Stephanodiscus hantzschii. As for Stephanodiscus hantzschii, it dominates during fall and winter when the water temperature drops. Diatom showed 50% or higher dominant rate in all seasons at most sites. Most sites turned out to be eutrophic based on the standing crop of cells and chlorophyll a concentration. Total of 15 polluted water indicating taxa including Oscillatoria limosa appeared. From this result, the Dong stream was considered to be in the eutrophication. |