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首页> 外文期刊>Environmental toxicology and chemistry >ECOTOXICOLOGICAL IMPACT OF THE FUNGICIDE TEBUCONAZOLE ON AN AQUATIC DECOMPOSER-DETRITIVORE SYSTEM
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ECOTOXICOLOGICAL IMPACT OF THE FUNGICIDE TEBUCONAZOLE ON AN AQUATIC DECOMPOSER-DETRITIVORE SYSTEM

机译：杀菌剂戊丁唑对水分解物-破坏剂系统的生态毒理学影响

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Leaf litter breakdown is a fundamental process in aquatic ecosystems that is realized by microbial decomposers and invertebrate detritivores. Although this process may be adversely affected by fungicides, among other factors, no test design exists to assess combined effects on such decomposer-detritivore systems. Hence, the present study assessed effects of the model fungicide tebuconazole (65 μg/L) on the conditioning of leaf material (by characterizing the associated microbial community) as well as the combined effects (i.e., direct toxicity and food quality-related effects (=indirect)) on the energy processing of the leaf-shredding amphipod Gammarus fossarum using a five-week semistatic test design. Gammarids exposed to tebuconazole produced significantly less feces (～20%), which in turn significantly increased their assimilation (～30%). Moreover, a significantly reduced lipid content (～20%) indicated lower physiological fitness. The conditioning process was altered as well, which was indicated by a significantly reduced fungal biomass (～40%) and sporulation (～30%) associated with the leaf material. These results suggest that tebuconazole affects both components of the investigated decomposer-detritivore system. However, adverse effects on the level of detritivores cannot be explicitly attributed to direct or indirect pathways. Nevertheless, as the endpoints assessed are directly related to leaf litter breakdown and associated energy transfer processes, the protectiveness of environmental risk assessment for this ecosystem function may be more realistically assessed in future studies by using this or comparable test designs.
机译：凋落物分解是水生生态系统中的一个基本过程，可通过微生物分解剂和无脊椎动物有害生物来实现。尽管此过程可能会受到杀菌剂的不利影响，但除其他因素外，尚无测试设计可评估对此类分解物-除草剂系统的综合影响。因此，本研究评估了模型杀菌剂tebuconazole（65μg/ L）对叶片材料调理的作用（通过表征相关的微生物群落）以及综合作用（即直接毒性和食品质量相关的影响）（ =间接））使用五周的半静态测试设计对切碎双足纲Gammarus fossarum的能量进行处理。暴露于戊唑醇的γ-马来酸产生的粪便少得多（约20％），这反过来又大大增加了它们的同化率（约30％）。此外，血脂含量显着降低（〜20％）表明生理适应性降低。调节过程也发生了变化，这表明与叶片材料相关的真菌生物量显着减少（约40％）和孢子形成（约30％）。这些结果表明，戊唑醇会影响所研究的分解物-脱水物系统的两个组成部分。然而，不能明确地将对有害物水平的不利影响归因于直接或间接途径。然而，由于评估的终点与凋落物分解和相关的能量转移过程直接相关，因此在未来的研究中，使用此设计或类似的测试设计可能会更现实地评估环境风险评估对生态系统功能的保护性。

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