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The spatial and temporal distribution of microalgae in the South china Sea:evidence from GIS-based analysis of 18S rDNA sequences

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Science china(life Sciences) 2008年第12期51卷 1121-1128页

作者： li lüyan1, huang qiaojuan1,{2., lin duan2. chen jiahui2.& chen yueqin1 1 key laboratory of gene engineering of the ministry of education, state key laboratory for biocontrol, sun yat-sen University, guangzhou 5102.5, china 2.South china Sea Environmental Monitoring Center, state Oceanic Administration, {12. 510300,china 1. key laboratory of {2. engineering of the ministry of education State Key Laboratory for Biocontrol Sun Yat-Sen University Guangzhou 510275 China 2. South china Sea Environmental Monitoring Center State Oceanic Administration Guangzhou 510300 China

The purpose of this study was to estimate the spatial and temporal variation of microalgae in the South china Sea and to demonstrate the environmental factors controlling the diversity of microalgae by GIS (geographic information system)-based analysis of 18S rDNA sequences. Six 18S rDNA {2.braries were constructed from environmental samples collected at different sites in the study area, and more than 600 18S rDNA sequences were determined. The rDNA sequence data were then analyzed by DIVA-GIS software to display the spatial and temporal variation of phytoplankton’s composition. It was shown that the autotrophic eukaryotic plankton dominated over the heterotrophic cells in most of our clone {2.braries, and the dominating phytoplankton was Dinophyceae except for Bacillariophyta at the Xiamen harbor. The percentages of these two groups were controlled by water temperature and salinity. Our results also revealed that the species composition of Chlorophyta showed a close relationship with latitude, changing from Prasinophyceae at the high latitude to Trebouxiophyceae at the low latitude. Several newly classified picoplankton lineages were first uncovered in the South china Sea, including the pico-sized green alga Ostreococcus sp. and Picochlorum eukaryotum, and picobi{2.phytes, which was just discovered in 2.07 with unknown affinities to other eukaryotes. Their spatial and temporal variation were also analyzed and discussed.

关键词： microalgae GIS-based analysis 18S rDNA South china Sea

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