Trace metals in barnacles: the significance of trophic transfer

Barnacles have very high accumulated trace metal body concentrations that vary with local trace metal bioavailabilities and represent integrated measures of the supply of bioavailable metals. Pioneering work in Chinese waters in Hong Kong highlighted the potential value of barnacles (particularly Balanus amphitrite) as trace metal biomonitors in coastal waters,identifying differences in local trace metal bioavailabilities over space and time. Work in Hong Kong has also shown that although barnacles have very high rates of trace metal uptake from solution, they also have very high trace metal assimilation efficiencies from the diet. High assimilation efficiencies coupled with high ingestion rates ensure that trophic uptake is by far the dominant trace metal uptake route in barnacles, as verified for cadmium and zinc. Kinetic modelling has shown that low efflux rate constants and high uptake rates from the diet combine to bring about accumulated trace metal concentrations in barnacles that are amongst the highest known in marine invertebrates.

作 者： Philip S. RAINBOW WANG Wen-Xiong   作者單位： Philip S. RAINBOW(Department of Zoology, the Natural History Museum, Cromwell Road, London SW7 5BD, London, UK)

WANG Wen-Xiong(Department of Biology, the Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Hong Kong, China) 

刊 名： 中國科學C輯（英文版）  SCI 英文刊名： SCIENCE IN CHINA SERIES C(LIFE SCIENCES)  年，卷(期)： 2005 48(z1)  分類號： X1  關鍵詞： barnacles   trophic transfer   assimilation efficiency   trace metals  

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