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Effects of surface current patterns on spatial variations of phytoplankton community and environmental factors in Sunda shelf

  • [设施]:实验1
  • [期刊/会议名称]:CONTINENTAL SHELF RESEARCH
  • [摘要]:Phytoplankton community and environmental factors were investigated in the surface water from eastern Indian Ocean (EIO) to southern South China Sea (SCS) during April-May monsoon transition period both in 2010 and 2011. Our results indicated that the surface current patterns were different in the two cruises. Sea surface salinity (SSS) was lower in Java Sea US), but its salinity front obviously moved to the middle of Sunda Strait when surface waters flowed from JS to EIO in May of 2010. Nutrient concentrations were generally higher in Sunda Strait and JS. Silicate concentrations were significantly lower in EIO suggesting a possibility of silicate limitation for the growth of phytoplankton, which were less than 1 mu mol L-1 in the offshore stations of EIO in May of 2010. Phytoplankton abundance and biodiversity were significant higher in Sunda strait and its adjacent stations, with larger cell-size and higher diatoms proportion. More offshore species were found in Sunda Strait when surface waters flowed from EIO to JS in April of 2011. Nutrient source can be different in Sunda Strait during inflow or outflow of surface waters. The spatial variation of phytoplankton community was greatly determined by Chaetoceros spp., Navicula sp., Pleurosigma affine, Thalassionema frauenfeldii and nano-dinoflagelage. Salinity, nitrate and silicate were the most important environmental factors regulating the variation of phytoplankton community. This study suggests that spatial distribution of phytoplankton and environmental factors are significantly influenced by the surface current patterns and river discharges, and these influences should be greater in dry season. (C) 2014 Published by Elsevier Ltd.
  • [发表日期]:2014
  • [第一作者]:Ke, ZX
  • [第一作者单位]:中国科学院南海海洋研究所
  • [通讯作者]:Ke, ZX
  • [通讯作者单位]:中国科学院南海海洋研究所
  • [论文类型]:期刊
  • [期刊分类]:
  • [学科分类]:
  • [影响因子]:
  • [关键词]:Phytoplankton; Spatial distribution; Sunda shelf; Monsoon; Surface currents
  • [卷号]:
  • [期号]:82
  • [起止页码]:119-127
  • [简介]:本研究利用“实验1”科考船于20104-5月和2011年4-5月执行的两次“国家基金委东印度洋海洋综合科学考察航次”中调查了从南海通过巽他海峡到印度洋的表层水的理化因子和浮游植物群落结构特征。调查结果显示,在两次采样期间,这个区域表层海 的流向是不同的,并且对浮游植物的群落结构产生重要的影响。Java海的海表盐度较低,在海流从Java海流向印度洋的时候,其低盐的峰明显向靠近印度洋的一侧移动。巽他海峡和爪哇海的营养盐浓度均高于印度洋和南海。当2011年4月,海流从印度洋一侧流入爪哇海的时候,更多的远海的浮游植物种类在巽他海峡的表层水中发现。本研究显示该区域浮游植物和环境因子的空间分布均显著受到表层流的流向和河流输入的影响,并且在旱季的时候这种影响更为显著。