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便污染决定了在高降雨期间间歇性开放和关闭湖 (ICOLLs) 内的自然环境参数上的细菌聚集

Nathan L R Williams¹, Nachshon Siboni², Jaimie Potts³

¹Department of Biological Sciences, University of Southern California, USA.

|November 1, 2024

概括

降雨会显著改变间歇性关闭和开放的湖泊和湖 (ICOLLs) 中的细菌群落,增加污水传播的病原体和抗生素耐药性基因. 季节性变化也会影响这些重要的沿海生态系统中的微生物动态.

科学领域:

环境微生物学环境微生物学
沿海生态沿海生态
水质科学水质科学

背景情况:

间歇关闭和开放的湖泊和湖 (ICOLL) 是提供重要服务的关键生态系统.
这些环境面临着波动的物理化学条件和人为污染,影响微生物群落.
季节性变化和便污染对ICOLL微生物学的具体影响尚不清楚.

研究的目的:

调查季节性物理化学变化和便污染如何影响澳大利亚ICOLL中的细菌社区动态.
为了确定便污染的来源,并在ICOLL中追踪相关的抗生素耐药性基因 (ARG).
了解这些变化对ICOLL生态系统服务的影响.

主要方法:

在一年内,每月抽取四个ICOLL的样本.
用于细菌多样性分析的16S rRNA基因扩增序列测序.
对于便指标微生物 (人,狗,鸟) 和抗生素耐药基因 (ARG) 的定量聚合酶链反应 (qPCR).

主要成果:

细菌群落主要受到季节性物理化学变化 (盐度,温度,pH,DO,DOM) 的影响.
在大雨后,两个ICOLL显示了与污水输入直接相关的细菌聚集的显著变化.
雨水指标,污水/狗便标志物和ARG (sulI,tetA,dfrA1) 在降雨后增加;一些雨水标志物与ARG相关.

结论:

雨水事件期间的污水输入是暴露在雨水中的ICOLL中微生物转移的主要驱动因素.
自然的季节性物理化学变化在其他时间控制细菌群落.
气候变化引起的强烈降雨将加剧雨水和污水对ICOLL生态系统的影响.

关键词:

抗微生物耐药性基因 (ARG) 是一种抗微生物耐药性基因.抗微生物耐药细菌 (ARB) 是一种抗微生物耐药的细菌.在ICOLLS中,使用的是ICOLLS.标志物种是指标物种.微生物源追踪 (MST) 是一种方法.降雨事件和便污染

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