Journal of the Korean Society for Marine Environment & Energy (한국해양환경ㆍ에너지학회지)

The Korean Society for Marine Environment and Energy (한국해양환경•에너지학회)
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Bio-environmental Characteristics of the Uljin Marine Ranching Area (UMRA), East Sea of Korea. 1. Spatio-temporal Distributions of Phytoplankton Community

동해 울진 바다목장 해역의 생물해양학적 환경특성. 1. 식물플랑크톤 군집의 시·공간적 분포 특성

  • Received : 2015.11.23
  • Accepted : 2016.01.01
  • Published : 2016.02.25
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Abstract

This study describes the spatio-temporal distributions in phytoplankton community such as species composition, standing crops and dominant species from April to November 2008 in the Uljin Marine Ranching Area (UMRA). A total of 123 species of phytoplankton belonging to 67 genera was identified. In particular, diatoms and dinoflagellates were occupied more than 60.5% and 34.6% of total species, respectively. The annual dominant species were Thalassiosira sp., Pseudo-nitzschia pungens in spring, Leptocylindrus danicus, Guinardia striata in early summer, Cheatoceros cirvisetus, Ch. decipiens in early autumn and Skeletonema costatum -ls (like species), Pn. pungens in autumn. Phytoplankton cell density fluctuated with an annual mean of $48cells{\cdot}mL^{-1}$ between the lowest value of $1.8cells{\cdot}mL^{-1}$ in early autumn and the highest value of $240cells{\cdot}mL^{-1}$ in spring. According to the cluster analysis, the phytoplankton community of the UMRA was characterized by the nutrient supply from land side and water movement as current.

울진 동해바다목장 해역의 식물플랑크톤 군집의 시 공간적 분포특성을 파악하기 위하여 2008년 4월부터 11월까지 9개 정점의 표층과 10 m 수심에서 4회 현장조사를 실시하였다. 출현한 식물플랑크톤은 67속 123종으로 다양하였다. 군집은 규조류가 60.5%, 와편모조류가 34.6%를 차지하였고, 가을에 가장 많은 종이 출현하였다. 현존량은 9월 $1.8{\times}10^3cells{\cdot}L^{-1}$에서 4월 $2.4{\times}10^5cells{\cdot}L^{-1}$의 범위로 연평균 $4.8{\times}10^4cells{\cdot}L^{-1}$로 낮았다. 최우점 및 차우점종은 4월 소형인 Thalassiosira sp., Pseudo-nitzschia pungens. 6월은 Leptocylindrus danicus, Guinardia striata, 9월은 Cheatoceros cirvisetus, Ch. decipiens 그리고 11월은 Skeletonema costatum -ls (like species), Pn. pungens가 차지하였다. 종 다양성지수는 4월 낮고 9월에 높은 반면, 우점도 지수는 이와 반대 양상을 보였다. 집괴분석에 의한 해역구분에서는 전반적으로 해안선과 평행하게 연안 및 바깥 해역으로 구분되어, 식물플랑크톤 군집은 영양염류 공급과 해수유동에 의해 지배되는 것으로 판단되었다. 때문에 이러한 해역특성은 동해 바다목장 운영 및 관리에 충분하게 고려되어야만 할 것이다.

Keywords

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