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Distribution and driving factors of antibiotic resistance genes in treated wastewater from different types of livestock farms

文献类型： 外文期刊

作者： Chen, Tao 1 ; Zhang, Shiyu 1 ; Zhu, Run 1 ; Zhao, Minxing 1 ; Zhang, Yu 1 ; Wang, Yan 1 ; Liao, Xindi 1 ; Wu, Yinbao 1 ; Mi, Jiandui 1 ;

作者机构： 1.South China Agr Univ, Coll Anim Sci, Guangdong Prov Key Lab Agroanim Genom & Mol Breed, Guangzhou 510642, Guangdong, Peoples R China

2.South China Agr Univ, Coll Anim Sci, Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China

3.South China Agr Univ, Natl Engn Res Ctr Breeding Swine Ind, Guangzhou 510642, Peoples R China

4.South China Agr Univ, Minist Agr, Key Lab Trop Agr Environm, Guangzhou 510642, Peoples R China

5.Guangdong Engn Technol Res Ctr Armless Treatment, Yunfu 527400, Xinxing, Peoples R China

关键词： Treated wastewater; Antibiotic resistance genes; Bacterial community; Cooccurrence; Potential host bacteria

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2022 年 849 卷

页码：

收录情况： SCI

摘要： Treated wastewater from livestock farms is an important reservoir for antibiotic resistance genes (ARGs), and is a main source of ARGs in the environment. However, the distribution and driving factors of ARGs in treated wastewater from different types of livestock farms are rarely reported. In this study, treated wastewater from 69 large-scale livestock farms of different types, including broiler, layer, and pig farms, was collected, and 11 subtypes of ARGs, 2 mobile genetic elements (MGEs) and bacterial community structure were analyzed. The results revealed detection rates of NDM-1 and mcr-1 of 90% and 43%, respectively, and the detection rates of other ARGs were 100%. The relative abundance of ARGs, such as tetA, tetX and strB, in broiler farms was significantly higher than that in layer farms, but the bacterial a diversity was significantly lower than that in other farm types. Furthermore, although the treatment process had a greater impact on the physicochemical properties of the treated wastewater than the livestock type, livestock type was the main factor affecting the bacterial community in the treated wastewater. The analysis of potential host bacteria of ARGs revealed significant differences in the host bacteria of ARGs in treated wastewater from different types of livestock farms. The host bacteria of ARGs in broiler farms mainly belonged to Actinobacteria, layer farms mainly belonged to Proteobacteria, and pig farms mainly belonged to Firmicutes. Additionally, redundancy analysis showed that the distribution of ARGs may have resulted from the combination of multiple driving factors in different types of livestock farms, among which tnpA and NH4+-N were themain influencing factors. This study revealedmultiple driving factors for the distribution of typical ARGs in treated wastewater from different types of livestock farms, providing basic data for the prevention and control of ARG pollution in agricultural environments.

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