Dresden University of Technology, D-01062 Dresden, Germany.
Chemosphere. 2011 Apr;83(4):627-31. doi: 10.1016/j.chemosphere.2010.11.063. Epub 2010 Dec 13.
Invertebrate shredders such as Gammarus pulex are key species in contaminated stream ecosystems. Although a number of previous studies examining differences in metal accumulation between the gut system and remaining tissues of invertebrates exist, few focus on wide range of metals and metalloids that are relevant to contaminated systems. This study compared accumulation of the commonest (at study site) 15 metals and metalloids between the gut system including feces and remaining tissues of G. pulex. All metals and metalloids measured were significantly higher (p<0.001, except Cu p<0.005) in the gut system including feces than remaining tissues of G. pulex. Metals and metalloids in body tissues without the gut system including feces were significantly lower (Al, Cr, Fe and Mn (p<0.005), Sr and U (p<0.01), Co (p<0.05)) in content for a number of elements when compared to washed, whole G. pulex specimens. As well, all elements measured were significantly higher (all elements (p<0.005) except Cu and Co (p<0.05)) in gut system including feces than washed, whole G. pulex specimens. These results indicate that in G. pulex the uptake of all 15 metals and metalloids examined across the gut epithelium is minimalized or that sequestration of these elements in gut epithelial cells may occur.
无脊椎碎食者，如食蚊鱼，是受污染溪流生态系统中的关键物种。尽管之前有许多研究检查了无脊椎动物肠道系统和剩余组织之间金属积累的差异，但很少关注与受污染系统相关的广泛的金属和类金属。本研究比较了食蚊鱼肠道系统（包括粪便和剩余组织）中最常见的 15 种金属和类金属的积累情况。测量的所有金属和类金属在肠道系统（包括粪便）中的含量均显著高于食蚊鱼的剩余组织（p<0.001，除 Cu 为 p<0.005）。与清洗后的完整食蚊鱼标本相比，没有肠道系统（包括粪便）的体组织中的金属和类金属含量明显较低（Al、Cr、Fe 和 Mn（p<0.005）、Sr 和 U（p<0.01）、Co（p<0.05））。此外，与清洗后的完整食蚊鱼标本相比，肠道系统（包括粪便）中所有测量的元素含量均显著更高（所有元素（p<0.005），除 Cu 和 Co（p<0.05））。这些结果表明，在食蚊鱼中，所有 15 种金属和类金属的摄取都通过肠道上皮最小化，或者这些元素可能在肠道上皮细胞中被隔离。
