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Biogeochemistry of organic matter and associated elements along the river-estuary-ocean continuum
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Spatial changes in phytoplankton community structure in the Taiwan Strait
P-C1-04-S
Weisen Liao* , Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
Jianfang Hu, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
Ping¡¯an Peng, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
Presenter Email: wilson-no-1@163.com |
| Biomarkers have been widely used to reconstruct phytoplankton productivity based on the assumption that biomarker concentrations could reflect phytoplankton productivity in the surface seawater. In this study, the concentrations of diols and sterols in the surface sediments of Taiwan Strait were analyzed. Since brassicasterol, dinostanol and C30 1,15-alkyl diol are indicators of diatom, dinoflagellate and eustigmatophyte, respectively, they can be used to reconstruct phytoplankton community structure. The results show high productivity of diatom, dinoflagellate and eustigmatophyte in the upwelling region. The spatial patterns of these biomarkers indicated that diatoms are the dominant phytoplankton inside the upwelling region (Fig. 1). High diatom/dinoflagellate ratios also occur in the central of Taiwan Strait and off the Jiulong River mouth, which suggest that terrestrial source provide nutrient for the growth of diatoms. These results are consistent with previous studies using phytoplankton cell and pigments, which provides support for the use of biomarker to reconstruct phytoplankton productivities and community structure in the Taiwan Strait. |
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