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

The Korean Society of Oceanography (한국해양학회)
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The Study on the Seasonal Variation of Microbial Community in Kyeonggi Bay, Korea II. Nano-and Microzooplankton

경기만 수역에서 미세생물 군집의 계절적 변동 연구 II. 미소형 및 소형 동물플랑크톤

  • Published : 2003.05.01
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Abstract

To investigate seasonal variation and structure of the microbial community in Kyeonggi Bay, abundance and carbon biomass of nano-and micrzooplankton were evaluated in relation to size fractionated chlorophyll-a concentration, through the monthly interval sampling from December 1997 to November 1998. Communities of nano-and microzooplankton were classified into 4 groups such as heterotrophic nanoflagellate(HNF), ciliates, heterotrophic dinoflagellates(HDF) and zooplankton nauplii. Abundance and carbon biomass of HNF ranged from 380 to 4,370 cells ml-1(average 1,340$\pm$130 cells ml-1) and from 0.63 to 12.4 $\mu\textrm{g}$C 1-1(average 4.35$\pm$0.58 $\mu\textrm{g}$C 1-1), respectively. Abundance and carbon biomass of ciliates ranged from 331 to 44,571 cells ml-1(average 3,526$\pm$544 cells ml-1) and from 1.3 to 119.7 $\mu\textrm{g}$C 1-1(average 13.7$\pm$3.0 $\mu\textrm{g}$C 1-1), respectively. Abundance and carbon biomass of HDF ranged from 88 to 48,461 cells 1-1(average 9,034$\pm$2,347 cells 1-1) and from 0.05 to 54.05 $\mu\textrm{g}$C 1-1(average 6.9$\pm$2.4 $\mu\textrm{g}$C 1-1), respectively. Abundance and carbon biomass of zooplankton nauplii ranged from 5 to 546 indiv. 1-1(average 83$\pm$15 indiv. 1-1) and from 0.17 to 43.2 $\mu\textrm{g}$C 1-1(average 6.3$\pm$1.2 $\mu\textrm{g}$C 1-1), respectively. Eash component of microbial biomass was not different from tidal cycle except tintinnids group. Depth integrated nano-and microzooplankton biomass ranged from 124 to 1,635 mgC m-2(average 585$\pm$110 mgC m-2) and was highest in March and May. The relative contribution of each component to the nano-and microzooplankton showed difference according to seasons. Community structure of nano-and microzooplankton was dominated by planktonic ciliate group. During the study period, carbon biomass of nano-and microzooplankton was strongly positively correlated with size fractionated chlorophylla-a. It implied that prey-predator relationship between microzooplankton and phytoplankton was important in the pelagic ecosystem of Kyeonggi Bay.

경기만 표영 생태계에서 미소형 및 소형 동물플랑크톤의 군집구조와 생태학적 역할을 조사하기 위하여, 1997년 12월부터 1998년 11월까지 한달 간격으로 미소형 및 소형 동물플랑크톤의 생물량 분포와 군집구조를 조사하였다. 본 조사에서 미소형 및 소형 동물플랑크톤은 2~200 $\mu\textrm{m}$ 크기의 종속영양 미세생물로 정의 하였으며, 종속영양 미소 편모류, 빈 섬모충류와 유종 섬모충류를 포함하는 섬모충류, 종속영양 와편모류와 동물플랑크톤 유생으로 구분하였다. 종속영양 미소 편모류의 현존량과 탄소량은 각각 330~4,370 cells m $l^{-1}$(평균: 1,340$\pm$130 cells m $l^{-1}$), 0.63~12.4 $\mu\textrm{g}$C 1$^{-1}$(평균: 4.35$\pm$0.58 $\mu\textrm{g}$C 1$^{-1}$)로 분포하였고, 부유 섬모충류의 현존량과 탄소량은 각각 338~44,571 cells 1$^{-1}$(평균: 3,526$\pm$544 cells 1$^{-1}$), 1.3~119.7 $\mu\textrm{g}$C 1$^{-1}$(평균: 13.7$\pm$3.0 $\mu\textrm{g}$C 1$^{-1}$)로 분포하였고, 종속영양 와편모류의 현존량과 탄소량은 각각 88~47,461 cells 1$^{-1}$(평균: 9,034$\pm$2,347 cells 1$^{-1}$), 0.04~54.05 $\mu\textrm{g}$C 1$^{-1}$(평균: 6.9$\pm$ 2.4 $\mu\textrm{g}$C 1$^{-1}$)로 분포하였고, 동물플랑크톤 유생의 현존량과 탄소량은 각각 5~546 indiv. 1$^{-1}$(평균: 83$\pm$15 indiv. 1$^{-1}$), 0.17~43.2$\mu\textrm{g}$C 1$^{-1}$(평균: 6.3$\pm$1.2$\mu\textrm{g}$C 1$^{-1}$)로 분포하였다. 조사기간 동안 미소형 및 소형 동물플랑크톤 각 군집의 생물량은 유종 섬모충류를 제외하고는 조석에 의한 차이를 보이지 않았다. 표층부터 저층까지 합산한 미소형 및 소형 동물플랑크톤의 탄소량은 124~l,635 mgC $m^{-}$$^2$/(평균: 585$\pm$110 mgC $m^{-2}$ )로 분포하였으며, 3월과 5월에 가장 높게 나타났다. 미소형 및 소형 동물플랑크톤 중에서 부유 섬모충류가 가장 우점하는 그룹으로 나타났으며, 전체 미소형 및 소형 동물플랑크톤의 평균 42.3%를 기여 하였다. 미소형 및 소형 동물플랑크톤에 대한 각각의 그룹들의 상대적인 기여도는 미소형 및 소형 동물플랑크톤의 군집구조와 계절에 따라 다르게 분포하는 것으로 나타났다. 경기만 표영 생태계서 미소형 및 소형 동물플랑크톤의 군집구조는 식물플랑크톤의 크기별 분포 양상과 유사한 경향을 보였으며, 이 결과는 미소형 및 소형 동물플랑크톤과 식물플랑크톤 간에 피식-포식자의 관계가 있음을 암시하며, 피식-포식의 관계가 미세생물 먹이망에서 중요한 조절 요인임을 보여준다.

Keywords

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