Phytoplankton pigment patterns and community composition in the northern South China Sea during winter |
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| Authors: | Hongchang Zhai Xiuren Ning Xuexi Tang Qiang Hao Fengfeng Le Jing Qiao |
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| Institution: | (1) Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, P.O. Box 1131, Guangzhou, 510640, China; |
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| Abstract: | Phytoplankton pigment patterns and community composition were investigated in the northern South China Sea using high-performance
liquid chromatography and the CHEMTAX software from February 11 to 23, 2009. We recognized four different vertical distribution
patterns of pigments: chlorophyll a (Chi a)-like type, divinyl chlorophyll a (DV Chi a) type, even distribution type, and surface type. The average value of ratios of accessory photo-protective pigments (APP)
to accessory photo-synthetic pigments was 0.89±0.63 in the upper 50 m and 0.16±0.06 below 50 m depth. With increasing depth,
APP decreased and photo-synthetically active radiation was attenuated. There was an obvious succession in the phytoplankton
community from inshore to the open sea. Diatoms were dominant in the inshore region, while pelagophytes, Prochlorococcus, cyanobacteria and prymnesiophytes were dominant in the open sea. The vertical distribution of phytoplankton also differed
greatly from inshore to the open sea. In the coastal and shelf region, diatoms were important components in the whole water
column. Cyanobacteria also had a high abundance at the Subsurface Chlorophyll a Maxima (SCM) in the shelf region. In the slope and open sea, Prochlorococcus and cyanobacteria were important groups above the SCM, while pelagophytes dominated below the SCM. |
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| Keywords: | phytoplankton pigment community composition northern South China Sea HPLC CHEMTAX |
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