The Centre for Conservation Ecology and Environmental Change, The School of Conservation Sciences, Bournemouth University, Talbot Campus, Poole, Dorset BH12 5BB, UK.
Environ Pollut. 2010 Jan;158(1):135-41. doi: 10.1016/j.envpol.2009.07.032. Epub 2009 Aug 15.
The transfer of Cd and Zn from soils amended with sewage sludge was followed through a food chain consisting of wheat, aphids and the predator Coccinella septempunctata. Multiple regression models were generated to predict the concentrations of Cd and Zn in C. septempunctata. No significant model could be generated for Cd, indicting that the concentration of this metal was maintained within relatively narrow limits. A model predicting 64% of the variability in the Zn concentration of C. septempunctata was generated from of the concentration of Zn in the diet, time and rate of Zn consumption. The results suggest that decreasing the rate of food consumption is an effective mechanism to prevent the accumulation of Zn and that the availability of Zn in the aphid prey increased with the concentration in the aphids. The results emphasise the importance of using ecologically relevant food chains and exposure pathways during ecotoxicological studies.
从受污水污泥改良的土壤中向食物链（包括小麦、蚜虫和捕食性七星瓢虫）中的转移。建立了多元回归模型来预测七星瓢虫体内 Cd 和 Zn 的浓度。未能生成 Cd 的显著模型，表明该金属的浓度保持在相对狭窄的范围内。从饮食中的 Zn 浓度、时间和 Zn 消耗率生成了一个可预测七星瓢虫 Zn 浓度 64%的变异的模型。结果表明，降低食物消耗率是防止 Zn 积累的有效机制，而蚜虫猎物中 Zn 的有效性随其浓度增加而增加。结果强调了在生态毒理学研究中使用生态相关食物链和暴露途径的重要性。
