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题名: The relationship between light intensity and nutrient uptake kinetics in six freshwater diatoms
作者: Shi, Pengling1, 2; Shen, Hong2; Wang, Wenjing2; Chen, Wenjie1; Xie, Ping2
关键词: Diatom ; Light intensity ; Michaelis-Menten equation ; Phosphorus ; Silicon ; Uptake kinetics
刊名: JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
发表日期: 2015-08-01
DOI: 10.1016/j.jes.2015.03.003
卷: 34, 页:28-36
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Environmental Sciences
研究领域[WOS]: Environmental Sciences & Ecology
英文摘要: In order to find effective measures to control diatom blooms, a better understanding of the physiological characteristics of nutrient uptake in diatoms is needed. A study of P and Si-uptake kinetics for diatom species from two light regimes was conducted at low (LL), moderate (ML) and high light intensities (HL) (2, 25 and 80 mu mol photons/(m(2).sec)), respectively. The results showed that P uptake of diatoms was heavily influenced by historic light regimes. P affinity changed with growth and photosynthetic activity. The lowest half saturation constant for P uptake (K-m(P)) was under HL for high-light adapted diatoms while the lowest half-saturation constant for low-light adapted diatoms was observed under LL. The Si half-saturation constant (K-m(Si)) increased with increasing light intensities for pennate diatoms but decreased for centric diatoms. Diatom volumes were correlated with the maximum Si uptake rates (V-m(Si)) at HL and K-m(Si) at ML and HL for six diatom species. Our results imply that when we assess the development of diatom blooms we should consider light intensity and cell volume in addition to ambient Si or P concentration. The relationship between light intensity and P-uptake suggests that we can find suitable methods to control diatom blooms on the basis of reducing phytoplankton activity of P-uptake and photosynthesis simultaneously. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
关键词[WOS]: PHOSPHATE-UPTAKE KINETICS ; SILICIC-ACID UPTAKE ; SKELETONEMA-COSTATUM ; MARINE DIATOMS ; AMMONIUM LIMITATION ; TRANSIENT-RESPONSE ; LIMITING NUTRIENT ; SINGLE ADDITION ; CELL-CYCLE ; PHYTOPLANKTON
语种: 英语
WOS记录号: WOS:000362980400004
ISSN号: 1001-0742
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/27277
Appears in Collections:淡水生态学研究中心_期刊论文

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作者单位: 1.Huazhong Agr Univ, Coll Fisheries, Wuhan 430070, Peoples R China
2.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China
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