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Epilithic Diatom Communities in Streams of Jeju Island

제주도내 하천의 부착규조 군집

  • Jung, Myoung Hwa (Department of Biological Science, Chonnam National University) ;
  • Cho, Hyeon Jin (School of Biological Sciences and Biotechnology, Chonnam National University) ;
  • Yun, Jung Ha (School of Biological Sciences and Biotechnology, Chonnam National University) ;
  • Lee, Hak Young (Department of Biological Science, Chonnam National University)
  • 정명화 (전남대학교 자연과학대학 생물학과) ;
  • 조현진 (전남대학교 생물과학.생명기술학과) ;
  • 윤정하 (전남대학교 생물과학.생명기술학과) ;
  • 이학영 (전남대학교 자연과학대학 생물학과)
  • Received : 2013.11.27
  • Accepted : 2013.12.23
  • Published : 2014.03.31

Abstract

To identify distribution of epilithic diatom assemblages and the relationship between diatoms and water chemistry, samples were collected twice a year from 2008 to 2012, from at 6 streams in Jeju Island, South Korea. A total of 171 diatom taxa were identified, and Achnanthes lanceolata, Gomphonema pumilum, Melosira varians, Navicula minima and Nitzschia palea were dominantly observed. BOD ranged 0.0~1.6 mg $L^{-1}$, TN 0.230~13.240 mg $L^{-1}$ (average 4.432 mg $L^{-1}$), TP 0.020~0.316 mg $L^{-1}$ (average 0.092 mg $L^{-1}$), and N/P rate ranged 2.5~178.5. Average of epilithic algal chlorophyll-a and AFDM were 1.1 ${\mu}gcm^{-2}$ and 0.6 mg $cm^{-2}$, respectively. According to BOD standard, the water qualities of study area sites were at 'Good' level. However, the healthiness levels assessed from DAIpo and TDI were 'Fair' to 'Poor'.

본 연구는 제주도내 위치하는 상시 유수가 흐르는 6개의 하천을 선정하여 이화학적 요인과 부착 규조류 군집의 분포를, 2008년에서 2012년까지 연 2회 조사하였다. BOD는 0.0~1.6 mg $L^{-1}$의 범위로 높은 수질 상태를 나타냈으며, TN, $NH_3-N$, $NO_3-N$, TP와 $PO_4-P$는 각각 평균 4.432 mg $L^{-1}$, 0.069 mg $L^{-1}$, 3.822 mg $L^{-1}$, 0.092 mg $L^{-1}$, 0.071 mg $L^{-1}$으로 비교적 높은 영양염의 농도를 나타냈다. 조사기간 동안 출현한 부착 규조류는 총 171종으로 2목 4아목 10과 28속 150종 17변종 2품종 2아종으로 구성되어 있었으며, 주요 우점종은 광적응성종인 Achnan-thes lanceolata, Melosira varians, 호청수성종인 Gomphonema pumilum, 호오탁성종인 Navicula minima, Nitzschia palea 등으로 나타났다. DAIpo와 TDI를 이용한 생물학적 수질 평가에서는 각각 평균 56.0 (보통, C등급), 70.4 (불량, D등급)으로 제주도내 하천의 수생태건강성은 낮은 것으로 나타났다.

Keywords

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