• Title, Summary, Keyword: 남조류

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Removal Effects of Chlorophyll-a and Cyanobacteria Using Laboratory-scale Biomanipulation Tests (실험적 생물조절 기법을 이용한 엽록소 및 남조류 제거 효과)

  • Lee, Sang-Jae;Lee, Jae-Yon;Lee, Jae-Hoon;Bae, Dae-Yeul;Lee, Eui-Hang;Han, Jung-Ho;Hwang, Soon-Jin;An, Kwang-Guk
    • Korean Journal of Ecology and Environment
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    • v.41 no.spc
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    • pp.86-92
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    • 2008
  • This study was conducted to determine removal effect on phytoplankton (chlorophyll-${\alpha}$ as whole algae) and cyanobacteria by a fish Pseudorasbora parva and macroinvertebrate Palaemon paucidens in September 2006. Three treatments with 25 (T1), 50 (T2) and 100 (T3) individuals along with control (C1, no input fish), and two treatments with 25 (T4) and 50 (T5) individuals along with control (C1) were made for fish and macroinvertebrate, respectively. The initial concentrations of chlorophyll-${\alpha}$ $(Chl_i)$ in each 10L test tank were set up for the levels of $95{\sim}100{\mu}g\;L^{-1}$ and the daily values were monitored in the test tank during 7 days. In the lab tests, P. parva did not show Chl-${alpha}$ removal effect; the removal rate of Chl-${alpha}$ for P. parva was -58% in T1, -56% in T2, and 61% in T3 during the test period. In contrast, P. paucidens. in the treatments of T4 and T5 removed the phytoplankton effectively and the removal effect were appeared to be 33% and 22%, respectively. Also, P. paucidens showed high feeding efficiency in the removal of cyanobacteria. The levels of cyanobacteria were greatly lowed from 6,048 to 927 cells $mL^{-1}$ in T4 and from 6,539 to 1,053 cells $mL^{-1}$ in T5, resulting in 85% and 84% in the removal effect, respectively. Our results for biomanipulation tests suggest that P. paucidens may be used as a potential candidate organism for algae control in spite of the preliminary results by laboratory tests.

Superiority comparison of biologically derived algicidal substances (naphthoquinone derivative) with other optional agents using microcosm experiments (Microcosm 실험을 이용한 생물유래 살조물질 Naphthoquinone 유도체의 유해 남조류 제어효과 및 기존물질과의 우수성 비교)

  • Joo, Jae-Hyoung;Park, Bum Soo;Kim, Sae Hee;Han, Myung-Soo
    • Korean Journal of Environmental Biology
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    • v.38 no.1
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    • pp.114-126
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    • 2020
  • Bloom-forming toxic cyanobacteria Microcystis spp. are common in the summer season in temperate freshwater ecosystems. Often, it leads to the degradation of water quality and affects the quality of drinking water. In a previous study, NQ (naphthoquinone) compounds were shown to be effective, selective, and ecologically safe algicides for Microcystis spp. blooms. To analyze the superiority of developed NQ derivatives, we conducted a microcosm experiment using clay, which is frequently used in South Korea. Similar to previous studies, the NQ 40 and NQ 2-0 compounds showed high algicidal activities of 99.9% and 99.6%, respectively, on Microcystis spp. at low concentrations (≥1 μM) and enhanced phytoplankton species diversity. However, when treated with clay, a temporary algicidal effect was seen at the beginning of the experiment that gradually increased at the end. In addition, treatment with the NQ compounds did not affect either the abiotic or biological factors, and similar trends were observed with the control. These results showed that the NQ 2-0 compound was more effective, with no ecosystem disturbance, and more economical than the currently used clay. These results suggest that NQ 2-0 compound could be a selective, economically and ecologically safe algicide to mitigate harmful cyanobacterial blooms in the field.

Diversity of Planktonic Micro Algae in Saemangeum Water Regions (새만금 수역 부유성 미소조류의 다양성)

  • Yeo, Hwan-Goo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.9
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    • pp.3610-3614
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    • 2010
  • Taxonomic compositions and species diversities of the planktonic micro algae communities were investigated 8 times during the period from May, 2006 to November, 2007 in Saemangeum water regions. Total of 191 taxa were observed; 94 diatoms, 31 chlorophytes, 24 dinoflagellates, 24 cyanophytes, 11 euglenophytes, 3 silicoflagellates, 1 cryptophyte and 3 unidentified microflagellates. During the period of this study, diversity indices of the community were changed spatio-temporally and fluctuated irregularly. It was surmised that artificial factors to the water condition such as open and lock of the dike stressed to the planktonic micro algal groups.

Effect on phytoplankton and seletive withdrawal by Hydraulic-Gun-Aerators in H Reservoir (인공순환에 의한 H호 식물플랑크톤과 선택취수에 대한 영향)

  • Choi, Il-Hwan;Shin, Jae-Ki;Sohn, Byeong-Yong;Baek, Kyoung-Hee;Lee, Kyeong-Sik
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.1333-1337
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    • 2006
  • 표층수를 주요 취수원으로 활용하는 우리나라의 경우 저수지 내 남조류 대발생시 주로 인공순환에 의한 제어방안을 적용하고 있다. 본 연구에서는 간헐식 폭기장치를 사용중에 있는 H호를 대상으로 식물플랑크톤 제어 효과를 평가하고, 이에 따른 식물플랑크톤의 수직적 분포와 선택 취수와의 연관성을 규명하여 정수장 유입 원수의 수질을 향상하고자 하였다. 2005년 H호의 남조류 농도는 최대 $1.2mg/m^3 $ 수준으로 낮은 분포로 조사되었다. 남조강에 대한 폭기 효과는 6월에는 워낙 그 농도가 낮아 효과 분석 자체가 무의미 하였으나, 10월에는 비영향지점 보다 영향지점의 최대 농도가 약 28% 저감되는 효과를 확인하였다. 조사 기간 중 가장 높은 농도를 보인 조류강은 Cryptophyta이었으며 6월9일에 약 $5mg/m^3$ 농도로 측정되었다. 10월6일에는 Diatom, Bluegreen, Green algae, Cryptophyta가 비슷한 농도 분포로 혼재된 양상을 보였다. 다른 조류강의 경우 조사 기간 중 $3mg/m^3$ 이하의 농도로 측정되었다. 취수탑을 중심으로 설치하여 운영하는 간헐식 폭기장치 1기의 유효 영향 범위를 조사하기 위하여 폭기 영향권에서 식물플랑크톤 분포를 submersible fluorescence probe로 현장에서 실시간으로 조사한 결과 식물플랑크톤 밀도는 감소하고 수직적인 분포층은 깊어지는 현상을 보였다. 이러한 효과를 보이는 거리는 폭기 장치로부터 약 50m로 나타났으며 pH, DO, 수온항목의 결과에서도 같은 현상을 보였다. 이 결과에 따르면 현재 설치된 총 7기의 폭기 장치의 유효영향 범위는 최대 $0.07km^2$ 면적에 그 효과를 기대할 수 있을 것으로 판단되어, 남조 수화현상이 심화될 경우 인공순환에 의한 저감효과가 크지는 않을 것으로 예측된다. 조사 기간중 H호의 현존 식물플랑크톤량의 $60%{\sim}87%$가 수심 10m 이내에 분포하였고, 녹조강과 남조강이 우점하는 하절기에는 5m 이내에 주로 분포하였다. 취수탑 지점의 수심이 연중 $25{\sim}35m$를 유지하는 H호의 경우 간헐식 폭기장치를 가동하는 기간은 물론 그 외 기간에도 취수구의 심도를 표층 10m 이하로 유지 할 경우 전체 조류 유입량을 60% 이상 저감할 수 있을 것으로 조사되었다.

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Quantitative Analysis of Microcystins, Cyanobacterial Toxins in Soyang Lake (소양호에서 남조류 독소, 마이크로시틴의 정량 분석)

  • Lee, Jeong Ae;Lee, So Yeong;Pyo, Dong Jin
    • Journal of the Korean Chemical Society
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    • v.46 no.6
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    • pp.535-540
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    • 2002
  • It is very difficult to analyze the microcystins, cyanobacterial toxins quantitatively since it exists in a trace level in lakes. In this paper, two different analytical methods were tried to analyze the microcystins, cyanobacterial toxins quantitatively in water samples collected in Soyang lake. The first method was solid phase extraction method fol-lowed by High Performance Liquid Chromatography(HPLC), and the second method was Enzyme-Linked Immu-nosorbent Assay(ELISA) using the monoclonal antibody of microcystin.

Shell Necrosis of Haliotis discus hannai by Mastigocoleus sp. (Cyanophyta) in Korea (남조류, Mastigocoleus sp.에 의한 한국산 참전보의 패각 괴사증)

  • 최상덕;윤장택;조용철
    • Journal of Aquaculture
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    • v.11 no.4
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    • pp.465-474
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    • 1998
  • Shell necrosis, which is found in the juvenile stage of Haliotis discus hannai in th culture process, was examine in this study. In the necrosis shell, bacteria of rod type and a blue green algal species with heterocyst were observed. However, it appears to be caused by a boring blue green alga, Mastigocoleus sp., as based on SEM data. At the time of its infection, the shell was discolored from green into bright-grey, and then began to be brittle at the 4th to 6th breathing hole. After 60 days of culture, necrosis occurred in the breathing holes with many brown tiny colony, and continued to 3 years after culture. This shell necrosis was found in the tank culture system in land rather than in the cage culture system in sea, and greatly affected to the growth of Haliotis discus hannai, resulting in very small size of 16mm in 3 year old shell.

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Seasonal Variations of Cyanobacterial Toxins (microcystins) in Yeongchun Reservoir (영천호에서 남조류 독소(microcystins)의 계절적 변동)

  • Lee, Kyung-Lak;Jheong, Weon-Hwa;Kim, Jong-Min;Kim, Young-Saeng;Choi, Hee-Jin;Kim, Han-Soon
    • Korean Journal of Ecology and Environment
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    • v.41 no.2
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    • pp.264-274
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    • 2008
  • Seasonal variations of cyanobacterial toxins (microcystins) in Yeongehun reservoir were studied from March to December, 2007. High level of microcystins production was shown during the late autumn and winter seasons. Total microcystins concentration increased sharply when the dominant species changed from Anabaena sp. to Microcystis aeruginosa. Microcystins-RR and -YR were the main components of the microcystins, whereas microcystin-LR was detected in small quantities. Especially, large amounts of microcystin-LR were detected when standing crops of M. aeruginosa increased exponentially. Total microcystins concentration showed a negative correlation with water temperature. However, total microcystins were lowly correlated with other environmental factors except for water temperature. As a result, this study clearly demonstrated that M. aeruginosa was the main producer of microcystins in Yeongchun reservoir.

Prospect and Roles of Molecular Ecogenetic Techniques in the Ecophysiological Study of Cyanobacteria (남조류의 생리·생태 연구에서 분자생태유전학적 기법의 역할 및 전망)

  • Ahn, Chi-Yong
    • Korean Journal of Ecology and Environment
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    • v.51 no.1
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    • pp.16-28
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    • 2018
  • Although physiological and ecological characteristics of cyanobacteria have been studied extensively for decades, unknown areas still remain greater than the already known. Recently, the development of omics techniques based on molecular biology has made it possible to view the ecosystem from a new and holistic perspective. The molecular mechanism of toxin production is being widely investigated, by comparative genomics and the transcriptomic studies. Biological interaction between bacteria and cyanobacteria is also explored: how their interactions and genetic biodiversity change depending on seasons and environmental factors, and how these interactions finally affect each component of ecosystem. Bioinformatics techniques have combined with ecoinformatics and omics data, enabling us to understand the underlying complex mechanisms of ecosystems. Particularly omics started to provide a whole picture of biological responses, occurring from all layers of hierarchical processes from DNA to metabolites. The expectation is growing further that algal blooms could be controlled more effectively in the near future. And an important insight for the successful bloom control would come from a novel blueprint drawn by omics studies.

오리 먹고 힘이 팍!팍! 위풍당당 오리나간다-

  • Korea Duck Association
    • Monthly Duck's Village
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    • v.61 no.7
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    • pp.95-97
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    • 2008
  • 오늘 소개할 것은 여름철 대표 보양식 오리. 아직까지도 조류인플루엔자(AI)여파로 힘들어 하는 오리농가가 많은데 비 온 뒤 땅이 굳는다는 말이 있듯 더욱 더 철저한 관리사육으로 바쁜 나날을 보내고 있다는 전북 남원의 오리 사육농가를 찾아가 보았다. 조류인플루엔자 파동으로 아직까지 후유증이 남아 농가 사람들의 시름은 커져만 간다. 하지만 위기는 또 다른 기회라 하지 않던가? 위풍당당 오리가 나간다!

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