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首页> 外文期刊>Marine ecology progress series >Allometry of cadmium and zinc concentrations and bioaccumulation in the scallop Chlamys nobilis
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Allometry of cadmium and zinc concentrations and bioaccumulation in the scallop Chlamys nobilis

机译：扇贝衣藻中镉和锌浓度的异构和生物富集。

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摘要

Scallops (Bivalvia: Pectinidae) contain very high concentrations of cadmium (Cd) and zinc (Zn) in their body tissues. We investigated the allometry of Cd and Zn concentrations in the scallop Chlamys nobilis and the underlying biokinetic mechanisms. The metal influx rate from the dissolved phase and the weight-specific clearance rate decreased with body size, whereas the dietary assimilation efficiency (AE) increased with increasing body size. The dietary AEs of metals in the scallops were comparable when measured by the mass balance and.the dual radiotracer techniques. The efflux rate of Cd in the scallops was lower than those in other bivalves, whereas the efflux of Zn was comparable to those in other bivalves. Growth dilution appeared to be important in the overall metal accumulation in the scallops. The allometric dependencies of the biokinetic parameters were then combined with the measurements of metal concentrations in the water to predict the likely metal concentrations in scallops of different sizes using the biokinetic model. The modeling suggested that the very high AE and low efflux rate for Cd explained the high Cd concentrations in the scallops. Dietary uptake dominated the overall metal accumulation in the scallops. Both the predicted metal concentrations and the allometric coefficients of metals were comparable to the measured values. This study shows, for the first time, that the biokinetic model can be used to predict the effects of body size on the bioaccumulation of metals in marine invertebrates. The allometry of ingestion rate, compared to other biokinetic parameters, is mainly responsible for the allometry of metal bioaccumulation in the scallops.
机译：扇贝（双壳纲：Pectinidae）的人体组织中含有很高浓度的镉（Cd）和锌（Zn）。我们调查了扇贝衣原体中Cd和Zn浓度的异构关系及其潜在的生物动力学机制。溶解相的金属流入速率和体重比清除率随体型而降低，而饮食同化效率（AE）随体型增加而增加。当通过质量平衡和双重放射性示踪技术测量时，扇贝中金属的膳食AE相当。扇贝中Cd的外排率低于其他双壳类动物，而Zn的外排率与其他双壳类动物相当。生长稀释似乎对扇贝整体金属积累很重要。然后将生物动力学参数的异速动力学依赖性与水中金属浓度的测量结果结合起来，以使用生物动力学模型预测不同大小的扇贝中可能的金属浓度。该模型表明，Cd的极高的AE和低的流出率解释了扇贝中Cd的高浓度。饮食摄入主要控制扇贝中的总体金属积累。预测的金属浓度和金属的异构系数均与测量值相当。这项研究首次表明，生物动力学模型可用于预测体型对海洋无脊椎动物中金属生物累积的影响。与其他生物动力学参数相比，摄入速率的异形体主要负责扇贝中金属生物累积的异形体。

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