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북동 태평양수역에서 위도에 따른 부유 원생동물의 분포

The Distribution of Planktonic Protists Along a Latitudinal Transect in the Northeast Pacific Ocean

양은진|최중기|김웅서
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)|2004.06|Ocean and Polar Research|제26권 제2호|pp. 287-298

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참고문헌

키워드

부유 원생동물섬모충류종속영양 와편모류종속영양 미소편모류heterotrophic nanoflagellates북동 태평양Northeast Pacific Oceanplanktonic protistsheterotrophic dinoflagellates. ciliates
주제분류해양학

초록

Abstract

: As a part of Korea Deep Ocean Study program, we investigated the distribution of planktonic protists in the upper 200 m of the northeast Pacific from 5oN to 17oN, along 131o30'W. Area of divergence was formed at 9oN which is boundaries of the north equatorial counter current (NECC) and the north equatorial current (NEC) during this cruise. Chlorophyll-a concentration was higher in NECC than in NEC area. Pico chl-a(<2 mm) to total chl-a accounted for average 89% in the study area. The contribution of pico chl-a to total chl-a was relatively high in NEC area than in NECC area. Biomass of planktonic protists, ranging from 635.3 to 1077.3 mgC m-2(average 810 mgC m-2), was most enhanced in NECC area and showed distinct latitudinal variation. Biomass of HNF ranged from 88.7 to 208.3 mgC m-2 and comprised 15% of planktonic protists. Biomass of ciliates ranged from 123.6 to 393.0 mgC m-2 and comprised 25% of planktonic protists. Biomass of HDF ranged from 407.2 to 607.8 mgC m-2 and comprised 60% of planktonic protists. HDF was the most dominant component in both NECC and NEC areas. Nano-protist biomass accounted for more than 50% of total protists in the both areas. The contribution of nanoprotist to total protists biomass was relatively higher in NEC area than in NECC. The biomass of planktonic protists was significantly correlated with phytoplankton biomass in this study area. The size structure of phytoplankton biomass coincided with that of planktonic protists. This suggested that the structure of the planktonic protists community and the microbial food web were dependent on the size structure of the phytoplankton biomass. However, biomass and size structure of planktonic protist communities might be significantly influenced by physical characteristics of the water column and food concentration in this study area.

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