Earthworms highly increase ciprofloxacin mineralization in soils
Earthworms highly increase ciprofloxacin mineralization in soils
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DOI：
10.1007/s10311-012-0385-z
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发表时间：
2013-06
影响因子：
15.7
通讯作者：
C. Mougin;N. Cheviron;Cédric Répinçay;M. Hedde;G. Hernandez-Raquet
中科院分区：
文献类型：
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作者：
C. Mougin;N. Cheviron;Cédric Répinçay;M. Hedde;G. Hernandez-Raquet
这份报告表明，蚯蚓增加了8倍的矿化抗生素环丙沙星在土壤中。抗生素在环境分区中广泛使用和传播。抗生素可能进入食物链，从而引起环境和人类肠道细菌的耐药性。抗生素环丙沙星被怀疑会对土壤微生物过程产生重大不利影响，可能对土壤功能产生影响。然而，关于环丙沙星在土壤中的命运知之甚少。在此，我们研究了[2- 14 C]-环丙沙星在土壤-植物-水系统中的矿化和分布，其中环丙沙星通过添加猪泥浆的修改。结果表明，在培养84天后，抗生素的微生物矿化作用非常弱，低于0.01%。相比之下，在接下来的84天孵育期间，蚯蚓的加入使环丙沙星矿化从5倍增加到8倍。此外，抗生素的活性导致40%的放射性化合物从土壤上层转移到下层，改变了抗生素在土壤剖面中的分布。我们的结论是，蚯蚓可以有效地用于矿化环丙沙星和修改其在土壤中的分布。因此，蚯蚓改变了土壤生物对环丙沙星的暴露，进而改变了抗生素的生态毒理学影响。
This report shows that earthworms increase up to eight times the mineralization of the antibiotic ciprofloxacin in soils. Antibiotics are extensively used and disseminated in environmental compartments. Antibiotics may enter food chains and thus induce resistance in environmental and human commensal bacteria. The antibiotic ciprofloxacin is suspected to induce significant adverse effects on soil microbial processes, with possible consequences on soil functions. Nevertheless, little is known concerning the fate of ciprofloxacin in soils. Here, we studied the mineralization and distribution of the [2-14C]-ciprofloxacin in soil–plant–water systems where ciprofloxacin was applied by amendment of spiked pig slurry. Results show that a very weak microbial mineralization of the antibiotic, lower than 0.01 %, occurred after 84 days of incubation. By contrast, the addition of earthworms increased from 5 to 8 times ciprofloxacin mineralization during the following 84 days incubation. In addition, earthworm activity induced the transfer of 40 % of radioactive compounds from the upper to the lower layer of soil, modifying the distribution of the antibiotic within the soil profile. We conclude that earthworms can be used efficiently to mineralize ciprofloxacin and modify its distribution in soils. As a consequence, earthworms change the exposure of soil organisms to ciprofloxacin, and, in turn, the eco-toxicological impact of the antibiotic.