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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Acute dietary pre-exposure and trace metal bioavailability to the barnacle Balanus amphitrite
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Acute dietary pre-exposure and trace metal bioavailability to the barnacle Balanus amphitrite

机译：急性饮食前接触和藤壶Balanus amphitrite的微量金属生物利用度

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摘要

Rates of uptake from solution and assimilation efficiencies of the trace metals Ag, Cd and Zn were investigated in the barnacle Balanus amphitrite after exposure in the laboratory for 19 days to low and high doses of added Ag and Cd in a diatom (Thalassiosira weissflogii) diet, the major route of metal uptake in barnacles. The hypothesis under test was that acute metal pre-exposure would affect the assimilation efficiency (AE) of that and other metals and their rate of uptake from solution. It was found that pre-exposure of the barnacles to atypically high dietary challenges of Cd and Ag did not cause changes in the rates of uptake of Cd, Ag or Zn from solution. Similarly, there was no clear consistent effect of dietary pre-exposure to Cd or Ag on the assimilation efficiency of Cd, Ag or Zn. The efflux rates of the metals were also comparable following the acute dietary exposure. Subcellular fractionation data indicated that the majority of the three metals were partitioned in the insoluble fraction, with very little in the soluble fraction consisting of metallothionein-like proteins and other (heat-sensitive) proteins. The lack of induction of increased Cd or Ag AE after pre-exposure in barnacles contrasts with results for mussels; this inconsistency is interpreted to result from differences in physiological accumulation patterns, the barnacles relying to an extreme extent on insoluble detoxification.
机译：在实验室暴露于硅藻（Thalassiosira weissflogii）日粮中低剂量和高剂量添加的Ag和Cd 19天后，在藤壶Balanus辉石中研究了微量金属Ag，Cd和Zn的溶液吸收速率和同化效率。 ，是藤壶中金属吸收的主要途径。接受测试的假设是，急性金属预暴露会影响该金属与其他金属的同化效率（AE）及其从溶液中的吸收速率。发现藤壶预先暴露于非典型高浓度的镉和银的饮食挑战不会引起溶液中镉，银或锌的吸收速率发生变化。同样，饮食中预先暴露于Cd或Ag对Cd，Ag或Zn的吸收效率也没有明显的一致影响。在急性饮食中，金属的外排率也相当。亚细胞分级分离数据表明，三种金属中的大部分被分配在不溶部分中，极少在可溶部分中由类金属硫蛋白样蛋白和其他（对热敏感的）蛋白组成。在藤壶中预先暴露后，缺乏诱导增加的Cd或Ag AE的能力与贻贝的结果形成对比。这种不一致被认为是由于生理积累模式的差异所致，藤壶在很大程度上依赖于不溶性排毒。

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