충남논단 : 태안군 지역 자연환경의 고찰

여환구 충남발전연구원 1999 열린충남 Vol.15 No.-

대부도 및 제부도 연안해역 독립영양 부유생물군집의 생태학적 고찰

여환구 한서대학교 산학협력연구원 부설 환경연구소 1999 환경연구소 논문집 Vol.2 No.-

대부도 및 제부도 인근 해역에서 식물플랑크톤 군집구조의 파악을 위해 1996년 5월과 10월에 현장관측을 실시하였다. 연구해역의 식물플랑크톤 군집은 대체로 규조류 종들이 우점하였고 특히 Skeletonema costatum과 Parlia sulcata는 계속 우점하였다. 식물수문적 수역구분을 위해 시도한 집괴분석의 결과는 5월에는 특징적 양상이 보이지 않았으나 10월에는 육지에 인접한 수역과 바깥쪽 수역이 분리되었다. 한편 식물플랑크톤 군집의 종다양성지수는 5월에 1.98 - 2.54, 10월에는 1.91 - 2.53의 범위에 있었으며 대체로 2.0을 넘는 갑을 보였다. The structures of phytoplankton communities in the coastal waters of Taebudo and Jebudo were investigated two times, in May and October, 1996. Skeletonema costatum and Paralia sulcata, diatom species dominated in this study area continuously. The result of cluster analyses between the sampling stations didn't show characteristics in May, but the result in October showed seperated phytohydrographic regions, adjacent waters to the land and the waters far away from the land. Species diversities ranged from 1.98 to 2.53 in May and from 1.91 to 2.53 in October, and most of the values were higher than 2.0.

고리해역 표영생태계내 비생물 환경요인과 일차생산 변동

여환구,심재형,박종규 ( Hwan Goo Yeo,Jae Hyung Shim,Jong Gyu Park ) 한국환경생물학회 1996 환경생물 : 환경생물학회지 Vol.14 No.2

Abiotic environmental factors and primary production were investigated at the adjacent waters of Kori in southeastern coast of Korea, seasonally in 1992. The average concentrations of chlorophyll-a varied from 2.01 to 5.88㎍Chl-a·ℓ^-1 and showed spring and autumn bloom. The fraction of nano- and picoplankton was 74.8% of total biomass of primary producers in April but larger cell size group, netplankton contributed 54.9% to the total biomass and caused autumn bloom in October. Daily primary productivity ranged from 316.5 to 3538.8㎎C·m^-2·day^-1. Except the result of October, the production of nano- and picoplankton were over than 70% of primary production. Assimilation number of phytoplankton ranged from 0.20 to 5.79㎎C·㎎ Chl-a^-1·hour^-1 and the average N/P ratio was 8.65. Nitrogenous nutrient might be limiting factor to the growth of primary producers because of low level of N/P ratio. The data of apparent oxygen utilization (AOU) showed vertical stratification of water column in summer.

한국 연안해역에 있어서 온배수 배출의 생태학적 영향 3. 고리 원자력발전소 부근 해역 무생물환경과 일차 생산자의 군집구조

여환구,심재형 ( Hwan Goo Yeo,Jae Hyung Shim ) 한국환경생물학회 1992 환경생물 : 환경생물학회지 Vol.10 No.2

Abiotic environmental factors and the community structure of primary producer in thermal effluent region, adjacent waters of Kori Nuclear Power Plant were investigated monthly from March, 1987 to February, 1989. The area showing the rise of water temperature (ΔT) over 2-3℃ by thermal effluent extended to about 2㎞ from the discharge of power plant and to the depth 5m and the area over ΔT 1℃ were variable but usually extended 2-4㎞. Though seasonal fluctuations of nutrient concentrations showed general patterns of temperate neritic region, the average ratio of nitrogen and phosphate nutrient (N/P ratio) ranged 6.98-8.49 and nitrogenous nutrient seemed to be limited. A total of 160 phytoplankton species were identified and Skeletonema costatum was dominant species all the year round. Phytoplankton species diversities were lower than those of previous studies which investigated before the full operation (4 units) of Kori Nuclear Power Plant. This indicats that the structure of phytoplankton community had changed unstable by the effect of thermal effluent. The result of cluster analysis shows that phytoplankton community structure are closely related with water temperature and phytohydrographic regions are usually divided into two parts by the isotherm, that is, ΔT 4℃ line. Therefore ΔT 4℃ might be a critical temperature leading transformation of the primary producers community structure.

진해만 동부 해역내 식물플랑크톤 군집과 수질환경의 계절 변동

여환구,박미옥 한국환경과학회 1997 한국환경과학회지 Vol.6 No.3

The community of phytoplankton and water quality were investigated 5 times from October, 1994 to October, 1995 in the east area of Chinhae Bay. Seasonal changes of environmental parameters were shown general pattern and related to the red tide mechanism of phytoplankton community. Seasonal variations of dissolved oxygen concentrations were affected by the photosynthetic activity of phytoplankton community and the increase of COD at the bottom water was occurred after the red tide. The standing stocks of phytoplankton in this study area ranged 202 - 1616 Cells·ml^-1 and the bloom(red tide) was formed from April to July. The diatom species, Skeletonema costatum was a dominant species all the year round and the dinoflagellate species, Alexandrium tamarense and Prorocentrum triestinum were red tide species increased standing stocks in phytoplankton bloom.

한국 연안해역에 있어서 온배수 배출의 생태학적 영향 4. 고리원자력발전소 부근 해역 일차생산자의 생물량과 생산력

여환구,심재형 ( Hwan Goo Yeo,Jae Hyung Shim ) 한국환경생물학회 1993 환경생물 : 환경생물학회지 Vol.11 No.2

Spatial and temporal variations of phytoplankton standing stocks ranged from 865 to 13,645Cells·㎖^-1 in the adjacent waters of Kori Nuclear Power Plant from March, 1987 to February, 1989. Seasonal variations of standing stocks of phytoplankton showed high concentrations above 5,000Cells·㎖^-1 in spring and summer 1987. Phytoplankton blooms by netplankton (cell size>20/㎛) occurred in June and September 1988. Though the fractions of nanoplankton (cell size<20/㎛) to the total phytoplankton standing stocks were always higher than 67%, netplankton standing stocks underwent more remarkable fluctuation with the seasons by heated effluent. The minimum standing stock was recorded at the thermal effluent stations. And the distribution of chlorophyll-a concentrations was similar to the pattern of phytoplankton standing stocks. Primary productions measured by C-14 method were varied from 14.5 to 3283.4㎎C·m^-2-day^-1 spatiotemporally. The minimum primary productivity was measured at the thermal effluent discharge stations except the result of survey in December, 1988. Assimilation numbers of phytoplankton ranged from 0.2 to 11.7㎎C·㎎Chl-a^-1·hour^-1 and were high in the area not affected by heated effluent during summer.

원자력발전소 및 화력발전소 냉각계통 통과에 따른 식물플랑크톤의 영향

여환구,김만근 ( Hwan Goo Yeo,Man Geun Kim ) 한국환경생물학회 1998 환경생물 : 환경생물학회지 Vol.16 No.2

The mortalities of phytoplankton passed through the cooling system in Kori Nuclear Power Plant were estimated in the range of 21∼59% during the period of February to December, 1996. Yearly mean of the mortalities was 37% and this was lower than the result (55%) of previous study. The results from the cooling system of Seoinchon Power Plant were compared with those from Kori Nuclear Power Plant where three surveys were carried out from December, 1994 to May, 1995. The result measured by standing stock method was 35% and the result of chlorophyll method was 25%, respectively. And the mortality caused by mechanical stress of cooling water pumping seemed to be lower than 10%.

여수, 광양 내만 해역 부유생물 군집의 종 다양성

여환구(Hwan-Goo Yeo),강헌(Hun Kang),신윤근(Yoon Keun Shin) 상지대학교 환경과학기술연구소 2003 환경과학연구 Vol.9 No.1

  식물플랑크톤 군집을 여수, 광양 인접해역에서 2001년 7월부터 2002년 3월까지 4회에 걸쳐 조사하였다. 몇몇의 규조류 종들이 일반적인 계절천이를 나타내었고, 광온ㆍ광염성 규조류인 Skeletonema costatum은 본 연구 해역에서 연중 우점종으로 나타났다. 한편, 식물플랑크톤 현존량은 수시로 대발생 수준(1000 cells/㎖)에 도달하였고 종 다양성지수는 전 조사에 걸쳐 0.43에셔 1.82의 범위로 나타났기에 종다양성지수의 모든 계산 값은 2.0에 미달하였다.   Phytoplankton communities as the representative autotrophic plankton group were investigated four times from July, 2001 to March, 2002 in the vicinity of Yeosu and Kwangyang. Several diatom species were shown typical seasonal succession and Skeletonema costatum, an eurythermal and euryhaline diatom species was a dominant species in this study area. The standing stocks often reached to the level of phytoplankton bloom(1,000cells/㎖) and species diversity indices ranged from 0.43 to 1.82 during the total period, and all the values were lower than 2.0.

안면도 꽃지해수욕장 수질 및 식물플랑크톤

여환구(Yeo, Hwan-Goo) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.1

2011년 하절기에 안면도 꽃지해수욕장 수질 및 식물플랑크톤을 조사하였다. COD는 때때로 5.0mg/l를 초과 하였고 SS는 대체로 40.0mg/l를 초과하였다. DO, pH, 염분 등은 대체로 안정적인 수준이었고 폭우의 영향으로 염분 값이 다소 변동하였다. 엽록소 농도와 식물플랑크톤 현존량은 8월에 상대적으로 높은 값을 보였으나 우려되는 녹,적 조 현상은 발생하지 않았다. 식물플랑크톤 우점종은 6월과 7월에 다량의 와편모조류가 출현했으나 8월에는 보편적인 규조류 종들이 우점하였다. 대장균군수는 7월보다 8월에 다소 높은 값(>400CFU/100ml)을 보였으나 위생학적으로 문제될 수준은 아니었다. Physicochemical water conditions and phytoplankton were investigated at Ggot-jee beach in Anmyondo, summer season of 2011. COD were sometimes recorded higher than 5.0mg/l and SS were always over 40mg/l. DO, pH and salinity were stable generally but low salinity was affected by heavy rainfall. In spite of relatively high concentrations of chlorophyll and phytoplankton standing stocks, discolored water phenomena(green or red tide) had not been occurred. A few dinoflagellate species were dominated in June and July, but general diatoms were dominant species of phytoplankton community in August. Escherichia coli concentrations were higher in August(>400CFU/100ml) than in July but it's not the level of hygienic problem.

새만금지역 내방수제 착공이후의 식물플랑크톤 군집

여환구(Hwan-Goo Yeo) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-

새만금수역 내부의 방수제 착공시점인 2011년부터 2013년까지 새만금 수역을 담수역, 하구역, 만경호 및 동진호 수역과 방조제 밖 외해역 등 4개의 수역으로 나누어 연 4회씩 식물플랑크톤 군집을 조사하 였다. 2011년 조사(3월, 6월, 9월, 11월)에서는 각 시기별로 48 - 59종씩의 식물플랑크톤이 출현하였으 며 만경호 및 동진호 수역에서 6월의 결과는 담수종이 우세하였으나 9월에는 담수종과 해수종의 공존 이 관찰되었다. 2012년 조사(4월, 6월, 9월, 11월)에서는 각 시기별로 45 - 65종이 출현하였고 9월에 가 장 다양하였는데 그 원인은 담수정점들을 중심으로 남조류의 출현종수가 증가한 것에 기인한 결과였 다. 2013년 조사(3월, 6월, 9월, 11월)는 56 - 69종이 출현하여 연구수역은 최근으로 오면서 오히려 출 현종수는 증가하고 있었다. 특히 6월의 결과에서 최대 출현종수를 보였는데 해수영향을 받는 곳에서의 와편모조류 출현종의 증가와 담수역의 남조류, 녹조류 출현종의 증가에 의한 결과였다.