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首页> 外文期刊>Environmental toxicology and chemistry >Caged midge larvae (Chironomus riparius) for the assessment of metal bioaccumulation from sediments in situ.
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Caged midge larvae (Chironomus riparius) for the assessment of metal bioaccumulation from sediments in situ.

机译：笼中mid幼虫（Chironomus riparius），用于评估原位沉积物中金属的生物蓄积性。

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First-stage larvae of the midge Chironomus riparius were exposed in small enclosures at 19 sites located in three different river basins in Flanders (Belgium). Sediments were sampled and sieved at 200 microm at all exposure sites. A layer of approximately 2 cm of sediment was placed in each cage and 100 midge larvae were added. Cages were placed in watercourses where resident midge larvae were present. Accumulation of Cd, Cr, Cu, Pb, Ni, and Zn was determined after four weeks of exposure when larvae had reached the fourth stage. Comparing metal levels between caged and resident larvae revealed no significant differences. A significant correlation between metal levels in caged and resident larvae was found when all sites were considered. However, such correlation was low (r2 = 0.28) for Pb. The highly significant r2 values found for Cu and Ni probably were due to only one site. Metal levels in tissue were related to levels in water and sediment, taking into account some sediment characteristics (particle size distribution and organic carbon) and oxygen level in the water. To determine the relative importance of these different sediment factors contributing to the variation in metal accumulation by the chironomids, nonlinear regression models were constructed. With the models used, 56.1, 32.2, and 57.4% of the variation for Cd, Pb, and Zn, respectively, could be described. None and 26.9% of the variation could be described for Cu and Ni, respectively. Among the environmental factors, organic carbon and oxygen levels in water were important in describing the accumulation of metals.
机译：在比利时法兰德斯的三个不同流域的19个地点，小蚊虫（Chironomus riparius）的第一阶段幼虫暴露在小空间中。对沉积物取样，并在所有暴露位置以200微米的筛子进行筛分。在每个笼子中放置约2厘米的沉积物层，并添加100只中龄幼虫。将笼子放置在有驻mid幼虫的水道中。幼虫到达第四阶段后，经过四周的接触测定了镉，铬，铜，铅，镍和锌的积累。比较笼中和常驻幼虫之间的金属水平，没有发现显着差异。当考虑所有地点时，发现笼中和常驻幼虫中金属含量之间存在显着相关性。但是，Pb的相关性很低（r2 = 0.28）。发现的Cu和Ni极高的r2值可能仅归因于一个位点。考虑到某些沉积物特征（粒径分布和有机碳）和水中的氧含量，组织中的金属含量与水和沉积物的含量有关。为了确定这些不同的沉积物因素对由手足动物造成的金属积累变化的相对重要性，构建了非线性回归模型。使用所使用的模型，可以描述Cd，Pb和Zn的变化分别为56.1、32.2和57.4％。对于Cu和Ni，没有变化和26.9％的变化。在环境因素中，水中的有机碳和氧含量对于描述金属的积累很重要。

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