Community structure of net-phytoplankton in the northwest South China Sea in the summer of 2012

doi:10.3969/j.issn.1001-909X.2014.03.012

Abstract

Abstract: Net-phytoplankton community structure and abundance were preliminary studied on the basis of investigation in the northwest South China Sea from August to September, 2012. A total of 206 species were identified, belonging to 4 phyla with 55 genera, of which 55.3% were Bacillariophyta(40 genera and 114 species) and 41.7% were Pyrrophyta(10 genera and 86 species). The average cell abundance of phytoplankton was 66.67×10⁴cells·m^-3 , which was mainly contributed by diatom with mean value of 65.79×10⁴cells·m^-3. The mean value of dinoflagellates was only 0.88×10⁴cells·m^-3. The dominant species were diatom such as Thalassionema franenfeldii,Rhizosolenia alata and Thalassionema nizschioide. The average Shannon-Wiener diversity index of phytoplankton community was 2.67, and the high value occurred in the Xisha Islands and the east part of surveyed area. Distributive pattern of phytoplankton was much related with environmental condition. The water column with high phytoplankton abundance and species diversity often coincided with a high nutrient level particularly in upwelling zone. It suggests that nutrient may play important role in impacting the distribution of phytoplankton abundance and the community structure in this region.

Key words: phytoplankton community structure, northwest South China Sea, nutrient, upwelling

CLC Number:

Q948.8

LI Dong-rong, DAI Xin-feng, LU Dou-ding, XIA Ping. Community structure of net-phytoplankton in the northwest South China Sea in the summer of 2012[J]. Journal of Marine Sciences, 2014, 32(3): 87-96.

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