SEASONAL STUDY ON THE Cd, Se, AND Zn UPTAKE BY NATURAL COASTAL PHYTOPLANKTON ASSEMBLAGES

WEN-XIONG WANG; ROBERT C.H. DEI; HUASHENG HONG

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SEASONAL STUDY ON THE Cd, Se, AND Zn UPTAKE BY NATURAL COASTAL PHYTOPLANKTON ASSEMBLAGES

机译：天然沿海浮游植物组合对镉，硒和锌吸收的季节研究

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We conducted a seasonal study of the uptake of Cd, Se(Ⅳ), and Zn by natural phytoplankton assemblages collected from two locations in Hong Kong coastal waters. Marine phytoplankton in Port Shelter was dominated by diatoms and cyanobacteria, while phytoplankton in Tolo Harbour was dominated by dinoflagellates. The natural phytoplankton assemblages were spiked with macronutrients (N and P) and metals, and the accumulation of these metals was followed for 3 to 5 d in the laboratory. The two coastal systems were mostly P limited, with N limitation observed only during the summer in Tolo Harbour. With the additions of these macronutrients, phytoplankton responded in different ways in their accumulation of trace metals. Cadmium concentrations (normalized to chlorophyll a [chl a] concentration) increased by 25 to 38% with the simultaneous addition of N and P but were roughly constant when N alone was added. In N-limited systems, the Cd concentration increased by 25% with N addition. Concentrations of Se were reduced competitively (by 40-45%) with P addition. Zinc concentrations were reduced by 23 to 38% when both N and P were added, largely because of a major increase in biomass (biodilution). Both Cd and Zn uptake rates increased with increasing growth rates. The uptake rate of Se was not related to the growth rate because of the confounding influence of P addition. The particle concentration effect was observed only for Zn, in which the increasing chl a concentration biodiluted the Zn concentration in the phytoplankton. Overall, our results suggest that macronutrients may affect trace metal accumulation in natural phytoplankton because of their controls on cell growth, which may have implications for our understanding of trace metal dynamics in coastal ecosystems during phytoplankton blooms as well as for the prediction of trophic transfer in food chains.

机译：我们进行了从香港沿海水域两个地点收集的天然浮游植物组合对Cd，Se（Ⅳ）和Zn吸收的季节性研究。庇护港的海洋浮游植物以硅藻和蓝细菌为主，而吐露港的浮游植物则以鞭毛藻为主。在天然浮游植物组合中掺入大量营养素（N和P）和金属，并在实验室中对这些金属的积累进行3至5天的跟踪。这两个沿海系统大多受P限制，仅在夏季在吐露港（Tolo Harbour）观察到N限制。通过添加这些大量营养素，浮游植物对微量金属的积累反应不同。在同时添加N和P的情况下，镉的浓度（标准化为叶绿素a [chla]的浓度）增加了25％至38％，但是当单独添加N时，镉的浓度大致保持恒定。在氮有限的系统中，添加氮后镉的浓度增加了25％。添加磷使硒的含量竞争性降低（降低了40-45％）。当同时添加氮和磷时，锌的浓度降低了23％至38％，这主要是由于生物量的大幅增加（生物稀释）。镉和锌的吸收率都随着增长率的增加而增加。由于磷添加的混杂影响，硒的吸收速率与生长速率无关。仅对锌观察到了颗粒浓度效应，其中增加的chl a浓度生物稀释了浮游植物中的Zn浓度。总体而言，我们的结果表明，大量营养元素可能会影响天然浮游植物中微量金属的积累，因为它们控制着细胞的生长，这可能对我们了解浮游植物开花期间沿海生态系统中微量金属的动态以及对营养物质转移的预测有影响。食物链。

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《Environmental toxicology and chemistry》 |2005年第1期|p.161-169|共9页
作者
WEN-XIONG WANG; ROBERT C.H. DEI; HUASHENG HONG;
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作者单位

Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类环境卫生、环境医学;毒物学（毒理学）;化学工业废物处理与综合利用;
关键词
phytoplankton; uptake; trace metals; nutrients; growth;

机译：浮游植物;摄取;微量金属;营养素;生长;

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8. Seasonal Phytoplankton Assemblages in Northeastern Coastal Waters of the United States [R] . Marshall, H. G. , Cohn, M. S. 1982

机译：美国东北沿海海域季节性浮游植物群落

SEASONAL STUDY ON THE Cd, Se, AND Zn UPTAKE BY NATURAL COASTAL PHYTOPLANKTON ASSEMBLAGES

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