| Title |
Cyanobacteria Community and Growth Potential Test in Sediment of Lake Paldang |
| Authors |
김용진 ( Yong-jin Kim ) ; 백준수 ( Jun-soo Baek ) ; 윤석제 ( Seok-jea Youn ) ; 김헌년 ( Hun-nyun Kim ) ; 이병천 ( Byoung-cheun Lee ) ; 김귀다 ( Guee Da Kim ) ; 박송은 ( Song Eun Park ) ; 유경아 ( Kyung A You ) ; 이재관 ( Jae-kwan Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2016.32.3.261 |
| Keywords |
Akinete; Benthic Cyanobacteria; Paldang; Sediment |
| Abstract |
We analyzed cyanobacterial community including akinete, resting cell, and benthic cyanobacteria in sediment of Bukhan, Namhan-River, Paldang-Lake, and Kyeongan-Stream and compared the physicochemical factors for water and pore water. We also performed cyanobacteria growth potential test through incubating sediment. As a result of physicochemical analysis, the concentrations of nutrients were similar for each depth of Bukhan-River. For Namhan-River and Lake Paldang sites, the concentrations of TP and DTN in bottom and deep water had higher levels. DTN in water body composed of NO3-N(73%) while DTN in pore water composed of NH3-N(77.8%). Benthic cyanobacteria in the sediment such as Oscillatoria tenuis, O. limosa, Phormidium tenue, Pseudanabaena limnetica, and Lyngbya sp. were dominant (between 0.0~243.3×103 cells/g, w/w). Cell densities of cyanobacteria in sediment depth of 0~2 cm in most sites were higher compared to those in other depths. The cell density of cyanobacteria in sediment correlated with pH, conductivity, BOD5, TP, DTP, and chl. a. Increased phytoplankton and organic matters were found to be able to inhibit the growth of benthic cyanobacteria. Results of cyanobacteria growth potential test after incubating sediment revealed that harmful cyanobacteria (Anabaena, Aphanizomenon, Microcystis, and Oscillatoria) appeared at 7 days post culturing. Base on these results, the methods used in this study are considered to be able to determine the appearance of harmful cyanobacteria. |