Field assessment of oxytetracycline exposure to the freshwater macrophytes Egeria densa Planch. and Ceratophyllum demersum L.
Field assessment of oxytetracycline exposure to the freshwater macrophytes Egeria densa Planch. and Ceratophyllum demersum L.
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DOI：
10.1016/j.envpol.2005.08.068
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发表时间：
2006-06-01
影响因子：
8.9
通讯作者：
Graham, DW
中科院分区：
文献类型：
--
作者：
Hanson, ML;Knapp, CW;Graham, DW
在一项微观研究中，两种水生植物致密石斑草和金鱼藻分别暴露于标称浓度为0、5、20、50和250mg/L的土霉素(n=3)中，外加20mg/L的土霉素，并添加氮(N)和磷(P)。在六周的曝光期内，每两周监测一次反应。这两种植物在250mU g/L土霉素和N、P修正单元中的生长都显着下降。土霉素副产物积累导致的光穿透性降低似乎是这些植物生长的主要改良剂。在这些处理中，与单株相比，在一些配对种植中(例如，密植大麦的根发育)，对土霉素暴露的敏感性增加，然而，对于这种反应没有明确的解释。根据这项研究中产生的毒性数据，我们估计目前淡水环境中土霉素的浓度不会对致密螺旋藻和球藻构成直接风险。(C)2005爱思唯尔有限公司。保留所有权利。
In a microcosm study, two aquatic macrophytes, Egeria densa and Ceratophyllum demersum were exposed to nominal concentrations of 0, 5, 20, 50, and 250 mu g/L oxytetracycline (n = 3), plus 20 mu g/L oxytetracycline amended with additional nitrogen (N) and phosphorus (P). Responses were monitored bi-weekly over a six-week exposure period. Both plant species exhibited a significant decline in growth in the 250 mu g/L oxytetracycline and the N- and P-amended units. Decreased light penetration resulting from accumulating oxytetracycline by-products appears to be the primary modifier in the growth of these plants. Increased Susceptibility to oxytetracycline exposure was noted in some paired plantings (e.g., E. densa root development), relative to individual plants in these treatments, however, no clear explanation for this response is available. Based on the toxicity data generated in this study, we estimate that current concentrations of oxytetracycline in freshwater environments do not pose a direct risk to E. densa and C. demersum. (c) 2005 Elsevier Ltd. All rights reserved.