Photosynthetic picoplankton in the northern South China Sea

NING Xiu-ren; CAI Yu-ming; LI Guo-wei; SHI Jun-xian

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NING Xiu-ren, CAI Yu-ming, LI Guo-wei, SHI Jun-xian. Photosynthetic picoplankton in the northern South China Sea[J]. Haiyang Xuebao, 2003, 25(3): 83-97.

Citation:

NING Xiu-ren, CAI Yu-ming, LI Guo-wei, SHI Jun-xian. Photosynthetic picoplankton in the northern South China Sea[J]. Haiyang Xuebao, 2003, 25(3): 83-97.

NING Xiu-ren, CAI Yu-ming, LI Guo-wei, SHI Jun-xian. Photosynthetic picoplankton in the northern South China Sea[J]. Haiyang Xuebao, 2003, 25(3): 83-97.

Citation:

NING Xiu-ren, CAI Yu-ming, LI Guo-wei, SHI Jun-xian. Photosynthetic picoplankton in the northern South China Sea[J]. Haiyang Xuebao, 2003, 25(3): 83-97.

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Photosynthetic picoplankton in the northern South China Sea

1.
Key Laboratory of Oceanic Dynamics Processes and Satellite Oceanography, State Oceanic Administration Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3.
Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada

Received Date: 2001-11-26
Rev Recd Date: 2002-02-25

Abstract

Abstract

During summer of 1999,the investigations of abundance and distribution of the three photosynthetic picoplankton-Synechococcus(Syn),Prochlorococcus(Pro) and Picoeukaryotes(Euk) and their environmentally regulating mechanisms were firstly carried out in the northern South China Sea.The results show that the average values of Syn,Pro and Euk abundances are(5.0±7.6)×10⁴ cell/cm³,(4.6±4.2)×10⁴ cell/cm³ and(1.8±1.1)×10³ cell/cm³,respectively.The most of high values of Syn population abundance appeared in the estuaries,coast and continental shelf in the sea area to the east of Leizhou Peninsula and Hainan Island,where nutrients were rich,and those appeared in the Beibu Gulf were secondary,while those appeared in continental slope and open sea were one tenths of the above those.Its distribution in water column was mainly above the thermocline and the value below it sharply lowered.The distribution pattern of Pro was markedly different from that of Syn; its abundance of communities at deep layers markedly increased towards outer sea,continental slope and open sea where nutrients were poor; the high values mainly occurred at the bottom of euphotic depth and above the nitrate-cline.The distribution difference of Euk in different sea areas is less than those of Syn and Pro,but it was higher in coast and continental shelf and lower in continental slope and open sea.The high values of Euk in the water column mostly appeared at the bottom of euphotic depth and it made a major contribution to subsurface chlorophyll maximum(SCM).These different distribution patterns depend on environmental regulation and difference of the ecological and physiological adaptation.In addition,in this study,it was discovered that two different populations of Pro at the surface and deep layer existed in the northern South China Sea and often vigorously grew above the nitrate-cline.The contributions of Syn,Pro and Euk,the three photosynthetic picoplankton,to total abundance of photosynthetic picoplankton in the studiy sea area were 50.9%,47.3%and 1.8% respectively.
- photosynthetic picoplankton,
- abundance and distribution,
- South China Sea,

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References(33)

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