The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Understanding of Phytoplankton Community Dynamics Through Algae Bioassay Experiment During Winter Season of Jinhae bay, Korea

생물검정실험을 통한 동계 진해만 식물플랑크톤의 군집 변동 특성 파악

  • 현봉길 (한국해양연구원 남해연구소) ;
  • 신경순 (한국해양연구원 남해연구소) ;
  • 김동선 (한국해양영구원 본원) ;
  • 김영옥 (한국해양연구원 남해연구소) ;
  • 주혜미 (한국해양연구원 남해연구소) ;
  • 백승호 (한국해양연구원 남해연구소)
  • Received : 2010.08.24
  • Accepted : 2010.11.25
  • Published : 2011.02.28
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Abstract

The distributions of phytoplankton assemblages and environmental factors in Jinhae Bay and their relationships were investigated to estimate the potential limiting nutrient for phytoplankton growth and community structure. In situ algal bioassay experiments were also conducted to assess the species-specific characteristics in phytoplankton responses under different nutrient conditions (control, N(+) and P(+) treatment). During the study periods, bacillariophyceae and cryptophyceae occupied more than 90% of total phytoplankton assemblages. Phytoplankton standing crops in the inner part of Masan Bay were higher than that of Jinhae Bay. The DIN:DIP ratio, pH and transparency showed the significant positive correlation with phytoplankton biomass. According to cluster and multidimensiolnal scaling (MDS) analysis based on phytoplankton community data from each station, the bay was divided into three groups. The first group included stations from the south-western part of Jinhae bay where cryptophyta species were dominated. The second group was distinguished from inner stations in Masan Bay. These stations showed low transpancy and high DIN:DIP ratio. The other cluster included the stations from the eastern part and central part of Jinhae Bay, which was characterized by the high DSi:DIP ratio and dominant of diatom species. Phosphorous (P) was limited in Masan Bay due to significantly increases in the phytoplankton abundances. Based on stoichiometric limitation and algal bio-assay in Jinhae Bay, nitrogen (N) was a major limiting factor for phytoplankton production. However, silicate (Si) was not considered as limiting factor, since Si/DIN and Si/P ratio and absolute concentration of nutrient did not create any potential stoichiometric limitation in the bay. This implies that high Si availability in winter season contributes favorably to the maintenances of diatom species.

동계 진해만 광역해역의 식물플랑크톤의 군집구조와 영양염 제한 특성을 파악하고자 식물플랑크톤 군집의 정점간 비교와 환경인자간의 관계를 조사하였다. 아울러 식물플랑크톤의 성장에 영향을 미치는 제한영양염을 평가하기 위해서 현장수를 이용하여 생물검정실험을 수행하였다. 조사기간동안 규조류와 은편모조류는 대부분의 정점에서 전체 식물플랑크톤의 90% 이상을 점유하였고, 식물플랑크톤의 현존량은 마산만이 진해만 보다 현저히 높게 관찰되었다. DIN:DIP 비, pH, 투명도는 식물플랑크톤의 생물량과 유의한 양(+)의 관계를 보였다. 식물플랑크톤 군집구조를 바탕으로 Cluster 분석과 MSD 분석을 한 결과 크게 3개의 그룹으로 구분되었다. 제 1그룹은 고성과 통영을 중심으로 한 진해만 서부해역으로 은편모조류가 전체 식물플랑크톤 현존량에 50% 이상으로 우점하였다. 제 2그룹은 마산만 가장 내측해역으로 높은 생물량, 낮은 투명도, 높은 DIN:DIP 비가 관찰된 것이 특이적이였다. 제 3그룹은 진해만 동부수역에 해당되는 마산만 외측과 진해만 중앙해역으로 구분이 되었고, 이들 정점의 특성은 DSi:DIP 비가 높았고, 규조류가 우점출현하였다. 영양염 절대농도와 구성성분비에 의한 제한영양염과 생물검정실험을 통한 영양염 제한은 마산만 대부분의 정점은 P 영양염의 제한이 관찰되었고, 진해만은 N기원의 영양염제한이 식물플랑크톤의 증식에 중요한 역할을 하는 것으로 파악되었다. 동계 진해만은 규산염이 상대적으로 풍부하게 존재하였고, 이는 규조류가 우점하기 좋은 환경이라 사료된다.

Keywords

Acknowledgement

Grant : 남해특별관리해역의 관리를 위한 해양 생태계 건강지수 개발

Supported by : 한국해양연구원

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