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Title: Significance of trophic transfer in predicting the high concentration of zinc in barnacles

Abstract

Barnacles are known to accumulate Zn to a phenomenal concentration, but physiological processes governing Zn accumulation are poorly defined. The authors determined the assimilation efficiency and efflux rate constant of Zn in barnacles (Balanus amphitrite) using radiotracer technique. Assimilation efficiency of Zn from ingested food ranged between 76 and 87% for the diatom diets and between 86 and 98% for the zooplankton preys. These AEs were the highest measured among aquatic invertebrates. Varying distribution in the soft tissues of zooplankton did not account for the variability of Zn AE observed among different zooplankton preys. Most Zn was distributed in the guts of the animals, presumably associated with the numerous granules beneath the gut epithelium. The efflux rate constant was 0.003 d{sup {minus}1}, and the calculated biological retention half-time was about 230 days. Using a simple bioenergetic-based kinetic model, the authors demonstrated that trophic transfer can account for such a high Zn concentration in barnacles. The predicted Zn concentrations in barnacles were directly comparable to the concentrations measured in Hong Kong coastal waters {micro}g. The high Zn concentration is related to its very efficient assimilation in barnacles coupled with a very low efflux rate. Biological variability must be fully appreciated beforemore » barnacles can be designated as an appropriate biomonitor of Zn contamination in coastal waters. The authors study suggests that metal concentration in aquatic animals can be predicted only when both physiological and geochemical processes are considered.« less

Authors:
; ;  [1]
  1. Hong Kong Univ. of Science and Technology (Hong Kong). Dept. of Biology
Publication Date:
OSTI Identifier:
696765
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 33; Journal Issue: 17; Other Information: PBD: 1 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; WATER POLLUTION; ZINC; BIOLOGICAL INDICATORS; BIOLOGICAL ACCUMULATION; CRUSTACEANS

Citation Formats

Wang, W.X., Qui, J.W., and Qian, P.Y. Significance of trophic transfer in predicting the high concentration of zinc in barnacles. United States: N. p., 1999. Web. doi:10.1021/es990149e.
Wang, W.X., Qui, J.W., & Qian, P.Y. Significance of trophic transfer in predicting the high concentration of zinc in barnacles. United States. doi:10.1021/es990149e.
Wang, W.X., Qui, J.W., and Qian, P.Y. Wed . "Significance of trophic transfer in predicting the high concentration of zinc in barnacles". United States. doi:10.1021/es990149e.
@article{osti_696765,
title = {Significance of trophic transfer in predicting the high concentration of zinc in barnacles},
author = {Wang, W.X. and Qui, J.W. and Qian, P.Y.},
abstractNote = {Barnacles are known to accumulate Zn to a phenomenal concentration, but physiological processes governing Zn accumulation are poorly defined. The authors determined the assimilation efficiency and efflux rate constant of Zn in barnacles (Balanus amphitrite) using radiotracer technique. Assimilation efficiency of Zn from ingested food ranged between 76 and 87% for the diatom diets and between 86 and 98% for the zooplankton preys. These AEs were the highest measured among aquatic invertebrates. Varying distribution in the soft tissues of zooplankton did not account for the variability of Zn AE observed among different zooplankton preys. Most Zn was distributed in the guts of the animals, presumably associated with the numerous granules beneath the gut epithelium. The efflux rate constant was 0.003 d{sup {minus}1}, and the calculated biological retention half-time was about 230 days. Using a simple bioenergetic-based kinetic model, the authors demonstrated that trophic transfer can account for such a high Zn concentration in barnacles. The predicted Zn concentrations in barnacles were directly comparable to the concentrations measured in Hong Kong coastal waters {micro}g. The high Zn concentration is related to its very efficient assimilation in barnacles coupled with a very low efflux rate. Biological variability must be fully appreciated before barnacles can be designated as an appropriate biomonitor of Zn contamination in coastal waters. The authors study suggests that metal concentration in aquatic animals can be predicted only when both physiological and geochemical processes are considered.},
doi = {10.1021/es990149e},
journal = {Environmental Science and Technology},
number = 17,
volume = 33,
place = {United States},
year = {1999},
month = {9}
}