Seasonal variation of picoplankton abundance and biomass in the northern South China Sea in summer and winter 2009

Le Fengfeng; Cai Yuming; Sun Jun; Hao Qiang; Liu Chenggang; Zhai Hongchang; Chen Jianfang

doi:10.3969/j.issn.0253-4193.2015.12.005

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Le Fengfeng, Cai Yuming, Sun Jun, Hao Qiang, Liu Chenggang, Zhai Hongchang, Chen Jianfang. Seasonal variation of picoplankton abundance and biomass in the northern South China Sea in summer and winter 2009[J]. Haiyang Xuebao, 2015, 37(12): 41-55. doi: 10.3969/j.issn.0253-4193.2015.12.005

Citation:

Le Fengfeng, Cai Yuming, Sun Jun, Hao Qiang, Liu Chenggang, Zhai Hongchang, Chen Jianfang. Seasonal variation of picoplankton abundance and biomass in the northern South China Sea in summer and winter 2009[J]. Haiyang Xuebao, 2015, 37(12): 41-55. doi: 10.3969/j.issn.0253-4193.2015.12.005

Citation:

Le Fengfeng, Cai Yuming, Sun Jun, Hao Qiang, Liu Chenggang, Zhai Hongchang, Chen Jianfang. Seasonal variation of picoplankton abundance and biomass in the northern South China Sea in summer and winter 2009[J]. Haiyang Xuebao, 2015, 37(12): 41-55. doi: 10.3969/j.issn.0253-4193.2015.12.005

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Seasonal variation of picoplankton abundance and biomass in the northern South China Sea in summer and winter 2009

doi: 10.3969/j.issn.0253-4193.2015.12.005

1.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Lab of Marine Ecosystems and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
2.
College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China;Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin University of Science and Technology, Tianjin 300457, China
3.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;State Key Lab of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;Key Lab of Marine Ecosystems and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2015-06-22
Rev Recd Date: 2015-11-02

Abstract

Abstract

The abundance,carbon biomass and distribution of picoplankton were investigated during the summer(August) and winter(February) of 2009 extending from near-shore coastal waters to oligotrophic open waters in northern South China Sea(nSCS). The results showed that the average abundances of Synechococcus(Syn) and Prochlorococcus(Pro) were higher in summer than winter,while Picoeukaryotes(PEuk) and heterotrophic bacteria(HBac) were opposite to Syn and Pro. Syn,PEuk and HBac were most abundant in the eutrophic coast region and continental shelf,while Pro was dominant in the slope and open waters. In vertical profile,the high abundance of Syn mainly appeared above the thermocline and decreased sharply below it. The high Pro abundance in the water column mostly appeared at the bottom of euphotic depth,as well as PEuk. The distribution of HBac was similar to Syn. These different distribution patterns depend on environmental variation and the ecological and physiological adaptation of each group of picoplankton. The contribution of each group of photosynthetic picoplankton biomass varied with the season and sea area:in the summer coastal shelf area,Syn accounted for 41% of total photosynthetic picoplankton biomass; Pro was major contributor(50%) in the slope open waters; while PEuk biomass took 40% higher in winter(reached 68% in the coastal shelf area). And HBac biomass was higher than photosynthetic picoplankton biomass both in the winter and summer.
- northern South China Sea,
- photosynthetic picoplankton,
- heterotrophic bacteria,
- abundance and carbon biomass,
- seasonal comparison

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