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首页> 外文期刊>Environmental toxicology and chemistry >ROLE OF SEDIMENT ORGANIC MATTER QUALITY AND FEEDING HISTORY IN DIETARY ABSORPTION AND ACCUMULATION OF PYRENE IN THE MUD SNAIL (HYDROBIA ULVAE)
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ROLE OF SEDIMENT ORGANIC MATTER QUALITY AND FEEDING HISTORY IN DIETARY ABSORPTION AND ACCUMULATION OF PYRENE IN THE MUD SNAIL (HYDROBIA ULVAE)

机译：沉积物有机物质量和饲喂史在泥S（水UL）中的吸收和积累中的作用

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Organic matter (OM) input to marine sediments varies seasonally both in quantity and quality. Because sedimentary OM (SOM) constitutes food for many benthic organisms, its properties should affect the dietary uptake of sediment-associated contaminants. We explored the effect of SOM quality/food value on short- and long-term pyrene accumulation in the mud snail (Hydrobia ulvae) and performed dual-tracer pulse-chase experiments to investigate the feeding mechanisms driving dietary pyrene uptake. The quality of the SOM was manipulated by enriching sediments either with high-quality microalgae or low-quality lignin, adding equal amounts of total organic carbon. Long- and short-term bioaccumulation increased with increasing SOM quality, as did pyrene ingestion rate (IR_(pyr)), which also was affected by feeding history. By feeding selectively, snails concentrated pyrene 10-fold in ingested compared to ambient sediment, independent of SOM quality. Average pyrene absorption efficiency (AE_(pyr): ～65%) varied inversely with SOM quality and IR_(pyr). Both AE_(pyr), and gut passage time (α 1/IR_(pyr)) agreed with theoretical models incorporating the time-dependence of absorption efficiency. Thus, SOM quality moderates dietary contaminant uptake in deposit feeders, and in H. ulvae, this occurs via OM-induced alterations of ingestion rate. Consequently, enhanced sediment-associated contaminant uptake is predicted for deposit feeders following phytoplankton blooms, principally because of OM quality-driven increases in the ingestion rate.
机译：输入海洋沉积物中的有机物（OM）的数量和质量均随季节变化。由于沉积物OM（SOM）构成许多底栖生物的食物，因此其特性应影响饮食中与沉积物相关的污染物的摄入。我们探讨了SOM品质/食品价值对mud蜗牛（Hydrobia ulvae）中短期和长期pyr积累的影响，并进行了双示踪脉冲追踪实验，以研究驱动饮食中pyr吸收的进食机制。通过使用高质量的微藻类或劣质的木质素富集沉积物，并添加等量的总有机碳来控制SOM的质量。长期和短期生物蓄积随着SOM质量的提高而增加，pyr的摄入速率（IR_（pyr））也有所提高，这也受喂养史的影响。通过选择性进食，蜗牛的concentrated摄取量比环境沉积物高10倍，而与SOM质量无关。 pyr的平均吸收效率（AE_（pyr）：〜65％）与SOM质量和IR_（pyr）成反比。 AE_（pyr）和肠道通过时间（α1 / IR_（pyr））都与包含吸收效率随时间变化的理论模型一致。因此，SOM的质量可降低沉积物喂食器中的饮食污染物摄入，而在ul.ulvae中，这是通过OM引起的摄入速率变化而发生的。因此，预计浮游植物开花后沉积物饲养者的沉积物相关污染物吸收将增加，这主要是由于OM质量驱动的摄食率增加。

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