2009年冬季南海北部生物标志物对表层浮游植物生物量/群落结构的指示作用

doi:10.11978/j.issn.1009-5470.2012.04.013

Abstract

Abstract:

Biomarkers have been widely used to reconstruct phytoplankton productivity based on the assumption that biomarker contents could reflect phytoplankton productivity in the surface seawater. However, this hypothesis has not been validated with modern survey. In this study, the contents and ratios of three phytoplankton biomarkers in the surface seawater of the northern South China Sea in winter 2009 were analyzed, to indicate spatial distributions of phytoplankton biomass and community structure. The results show high values for diatoms, dinoflagellates and coccolithophorids near the Pearl River Estuary and Guangdong coastal areas. The community structure indicates diatoms are the dominant phytoplankton species in winter. High values of dinoflagellate/diatom ratio occur near the slope area owing to intrusion of the Kuroshio, which favors the growth of dinoflagellates. The coccolithophorid/diatom ratio displays an increasing trend from the Pearl River Estuary to offshore region due to the advantage of coccolithophorids in oligotrophic environment, which is opposite to the productivity pattern of all biomarkers. These results are consistent with previous studies using phytoplankton cell and pigments, which provides support for the use of biomarker to reconstruct phytoplankton productivity and community structure in the SCS.

Key words: northern South China Sea, phytoplankton, biomarker, biomass, community structure

CLC Number:

Q178.53

LI Yu-hong, ZHAO Mei-xun, ZHANG Hai-long, XING Lei, YANG Hong-mei, DAI Min-han, WANG Lei. Phytoplankton biomarkers in surface seawater from the northern South China Sea in summer 2009 and their potential as indicators of biomass/community structure[J].Journal of Tropical Oceanography, 2012, 31(4): 96-103.

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Phytoplankton biomarkers in surface seawater from the northern South China Sea in summer 2009 and their potential as indicators of biomass/community structure

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