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Bioaccumulation of trace metals by the live macroalga Gracilaria lemaneiformis

文献类型： 外文期刊

作者： Wang, Zenghuan 1 ; Wang, Xunuo 1 ; Ke, Changliang 1 ;

作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China

2.Guangdong Prov China, Key Lab Fishery Ecol & Environm, Guangzhou 510300, Guangdong, Peoples R China

3.Minist Agr, Key Lab Aquat Prod Proc, Guangzhou 510300, Guangdong, Peoples R China

关键词： Bioaccumulation;Heavy metals;Kinetic model Algae;Live Gracilaria;lemaneiformis

期刊名称：JOURNAL OF APPLIED PHYCOLOGY （ 影响因子：3.215； 五年影响因子：3.612 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The macroalga Gracilaria lemaneiformis is an important and commercially valuable renewable resource. It is distributed widely in shallow marine waters but grows mostly on tropical or subtropical coasts. We investigated the accumulation of Cd, Cu, and Pb by live G. lemaneiformis under low concentrations. There was a positive correlation between the organisms' metal concentrations and exposure concentrations. When exposed to both Cu and Cd, the concentrations of Cu and Cd in G. lemaneiformis were higher than those exposed to solutions of Cu and Cd alone. However, the concentrations of heavy metals in G. lemaneiformis were not markedly different (p < 0.05) between the treatment groups and the control groups. We analyzed the results with nonlinear curve fitting and employed a two-compartment model to study the accumulation kinetics of heavy metals by G. lemaneiformis. The uptake rate constants and bioconcentration factors (BCFs) of the metals decreased with increased exposure concentration. The theoretical equilibrium concentrations increased significantly with the exposure concentrations. Our results suggested that G. lemaneiformis obviously accumulated heavy metals from seawater. As an important resource for food and pharmaceuticals, G. lemaneiformis should be cultivated in clear seawater

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