Seasonal variability of faecal indicator bacteria numbers and die-off rates in the Red River basin, North Viet Nam.
Seasonal variability of faecal indicator bacteria numbers and die-off rates in the Red River basin, North Viet Nam.
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DOI：
10.1038/srep21644
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发表时间：
2016-02-12
影响因子：
4.6
通讯作者：
Rochelle-Newall E
中科院分区：
文献类型：
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作者：
Nguyen HT;Le QT;Garnier J;Janeau JL;Rochelle-Newall E
红河是越南第二大河流，是越南北部大部分人口的主要水源。在这里，我们提出的大肠杆菌（EC）和总大肠菌群（TC）在红河流域，越南北部的年度调查结果。这项工作的目的是获得有关粪便指示细菌（FIB）的数量在一个年度周期，其次，以确定这些细菌指标的死亡率。从2013年7月至2014年6月，10个站点的每月观测结果显示，TC和EC分别高达39100 cfu（菌落形成单位）100 ml−1和15300菌落100 ml−1。我们观察到TC有显著的季节性差异（p < 0.05），雨季的TC数量更高。与此相反，没有显着的季节差异，发现EC。EC的FIB死亡率范围为0.01 d-1至最大1.13 d-1，TC为0.17 d-1至1.33 d-1。游离细菌的死亡率显著高于总细菌（游离+颗粒附着），表明颗粒附着在该系统中对FIB提供了一定程度的保护。
The Red River is the second largest river in Viet Nam and constitutes the main water source for a large percentage of the population of North Viet Nam. Here we present the results of an annual survey of Escherichia coli (EC) and Total Coliforms (TC) in the Red River basin, North Viet Nam. The objective of this work was to obtain information on faecal indicator bacteria (FIB) numbers over an annual cycle and, secondly, to determine the die-off rates of these bacterial indicators. Monthly observations at 10 stations from July 2013–June 2014 showed that TC and EC reached as high as 39100 cfu (colony forming units) 100 ml−1 and 15300 colonies 100 ml−1, respectively. We observed a significant seasonal difference for TC (p < 0.05) with numbers being higher during the wet season. In contrast, no significant seasonal difference was found for EC. The FIB die-off rates ranged from 0.01 d−1 to a maximum of 1.13 d−1 for EC and from 0.17 d−1 to 1.33 d−1 for TC. Die-off rates were significantly higher for free bacteria than for total (free + particle attached) bacteria, suggesting that particle attachment provided a certain level of protection to FIB in this system.