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북한강에서 출현한 Anabaena circinalis의 형태학적 특성 및 지오스민(geosmin) 발생 양상
윤석제 ( Youn Seok Jea ),김용진 ( Yong-jin Kim ),김헌년 ( Hun Nyun Kim ),김진용 ( Jin-yong Kim ),유미나 ( Mi-na Yu ),이은정 ( Eun Jeong Lee ),유순주 ( Soon Ju Yu ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.1
This study was carried out in the Bukhan River in the summer of 2014 and 2015, to identify the relationship between geosmin and the morphological changes in Anabaena. Identification of Anabaena was conducted using morphological and molecular analyses. Anabaena in this study was similar to Anabaena circinalis, A. crass, and A. spiroides with regard to regular coils, vegetative cell, akinete shape, and size, hoever, it was distinguishabl from A. crass and A. spiroides because of its larger trichome coil size. Additionally, the sequences of phycocyanin (PC) gene from Anabaena showed a 99% genetic similarity with A. circinalis NIES-1647 strain. The coil diameter of trichome ranged from 106 to 899 μm, and the diameter and abundance showed an insignificant positive correlation (r=0.544, p<0.05). The result of relationship between the coil diameter and the cell number per 360-degree rotation was kept at 33.8±5.2 cells per 100 μm diameter despite variable diameter. The average geosmin concentrations in 2014 and 2015 were investigated to be 99 ng/L and 35 ng/L, respectively. A. circinalis cell density contributed considerably to the change in geosmin and was positively correlated with geosmin concentration (2014; r=0.599, p<0.01, 2015; r=0.559, p<0.01). Our results suggest that geosmin and coil diameter could be estimated with the help of cell density.
환경요인에 따른 청평호 식물플랑크톤 군집 및 우점종의 천이 특성
윤석제 ( Seok Jea Youn ),김헌년 ( Hun Nyun Kim ),임종권 ( Jong Kwon Im ),김용진 ( Yong-jin Kim ),백준수 ( Jun-soo Baek ),이수웅 ( Su-woong Lee ),이은정 ( Eun Jeong Lee ),유순주 ( Soon Ju Yu ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.8
Phytoplankton populations were examined at three sites in Lake Cheongpyeong, South Korea from March 2008 to December 2016, including measurement of phytoplankton communities and their dominant species, abundance and environmental factors. The annual average ranges of water temperature, dissolved oxygen and conductivity were 15.2-18.8℃, 10.3-12.2 mg/L, 86-140 μS/cm, respectively, with similar values at all studied sites. The highest phytoplankton cell density was observed in spring and fall, and it subsequently decreased rapidly during heavy rainfall. Diatoms were dominant in spring (mainly Stephanodiscus hantzschii, Asterionella formosa) and fall (mainly Aulacoseira granulata), while greenalgae and cyanobacteria had high appearance in early-summer and summer, respectively, indicating that water temperature is the most important factor influencing their growth. Stephanodiscus hantzschii and Asterionella formosa frequently occurred at low water temperature (4.5-15.0℃ and 5.4-21.6℃, respectively) while Aulacoseira granulata and Anabaena spp. were favored by high water temperature (8.6-28.4 and 14.9-26.2℃, respectively) and phosphorus. Additionally, Fragilaria crotonensis occurred at low nutrient conditions. Rhodomonas spp. frequently appeared year-round.
우리나라 황해의 해산 돌말류 Ditylum brightwellii (West) Grunow의 형태학적 특징에 의한 두 유형
이진환,윤석제,Lee, Jin-Hwan,Youn, Seok-Jea 한국조류학회(藻類) 2007 ALGAE Vol.22 No.4
This study deals with the taxonomy of the marine diatom Ditylum brightwellii (West) Grunow: shape, size and ratio, marginal ridge, labiate process, areolation, and seasonal distribution are all considered. Ditylum brightwellii were divided into two type; prism- and cylinder-shaped. Comparisons between specimens from the Yellow Sea were made on, (1) shape- prism types are prismatic-shaped and/or regular square or right-angled tetragon, cylinder types are cylinder-shaped and/or long right-angled tetragon in the girdle view, respectively; (2) size and ratiodiameters of prism types are 82.1 ± 2 μm, while those of cylinder types are 21.2 ± 5 μm and ratio of pervalvar axis/diameter- prism types cells are 1.0-1.5, but cylinder types are 3.9-5.5; (3) marginal ridges- prism types have dotted, while those of the cylinder-type cells have piece, slotted or fimbriated on the marginal ridge; (4) labiate process- both prism- and cylinder-types are central part in valve face, but length of labiate processes of prism types are longer than those of cylinder types; (5) cell margin- the girdle margin show many shallow furrows in prism type and smooth in cylinder type; (6) areolation- both prism- and cylinder-types are a radial pattern in the valve center, but areolae of prism types are larger than those of cylinder types; (7) seasonal distribution- cylinder types are dominated in summer and prism types in the other seasons.
퇴적층 배양에 따른 식물플랑크톤 군집 형성과 이취미물질 발생 특성
김용진 ( Yong Jin Kim ),윤석제 ( Seok Jea Youn ),김헌년 ( Hun Nyun Kim ),박응로 ( Eung Roh P가 ),황문영 ( Moon Young Hwang ),박진락 ( Jin Rak Park ),이병천 ( Byoung Cheun Lee ),이재관 ( Jae Kwan Lee ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.6
In this study, Uiam-sediment(US) and Gongji-sediment(GS) were incubated to analyze the formation of phytoplankton community and occurrences of odorous compounds from benthic cyanobacteria. For the phytoplankton, 45 and 40 taxa were found in GS and US, respectively. The phytoplankton species detected in the harmful algae included Microcystis, Anabaena and Oscillatoria. As a result, a standing crop of phytoplankton appeared to be in the range of 0.9∼71.8×103 cells/mL in GS, 0.8∼51.2×103 cells/mL in US, and as the incubation progressed, benthic cyanobacteria was increased. The highest number of akinetes was shown in the initial incubation, and akinetes was reduced by 10% on day 4 of incubation start. After reduction of akinetes incubated for 4 days in US and 15 days in GS, Anabaena appeared from the surface water. Benthic cyanobacteria such as Oscillatoria tenuis, O. limosa and Lyngbya hieronymusii was dominant in GS(max. 3.96×106 cells/cm2) and US(max. 5.77×106 cells/cm2), forming cyanobacterial mats in sediment surface. Cyanobacterial mats were suspended after 10∼12 days incubation in GS and US. Before and after the suspension of cyanobacterial mats, the concentration of geosmin was the highest in GS(115 ng/L) and US(175 ng/L). In the second suspension of cyanobacterial mats in GS, the concentration of 2-MIB was increased to the range of 22~92 ng/L.
다변량 통계분석을 이용한 북한강의 수질 및 식물플랑크톤 군집 특성 평가
김헌년 ( Hun Nyun Kim ),윤석제 ( Seok Jea Youn ),변명섭 ( Myeong Seop Byeon ),유순주 ( Soon Ju Yu ),임종권 ( Jong Kwon Im ) 한국물환경학회 2019 한국물환경학회지 Vol.35 No.1
The purpose of this study is to evaluate the water quality and phytoplankton community in Bukhan River which account for 44.4 % of the total inflow into Lake Paldang, using multivariate statistical techniques (i.e., correlation analysis, principal component analysis (PCA)/factor analysis (FA)). Water samples were collected from March to November 2015 and the following parameters measured; water temperature, pH, DO, EC, SS, BOD, Chl-a, COD, TN, NO<sub>3</sub>-N, NH<sub>3</sub>-N, TP, DTP, PO<sub>4</sub>-P, and phytoplankton community. The water quality of the main stream and the tributaries were not significantly different apart from the relatively high concentration of BOD, COD and nutrients recorded in MH. The highest cell density of Stephanodiscus hantzschii and Merismopedia glauca dominated phytoplankton was observed in PD. Based on the correlation analysis, total phytoplankton and cyanophyceae were highly correlated with BOD, COD and nutrients. PCA/FA resulted in four main factors accounting for 82.240 % of the total variance in the water quality dataset. The group of component 1 (TN, DTN, DO, NO<sub>3</sub>-N, water temperature) and component 2 (PO<sub>4</sub>-P, T-P, DTP, SS) were classified as nutrient element factor whereas component 3 (Chl-a, COD, BOD, NH<sub>3</sub>-N, pH) was related to organic substances. Hence, the identification of the main potential environmental pollution factors in Bukhan River will help policy makers make better and more informed decisions on how to improve the water quality.