Seasonal variability of faecal indicator bacteria numbers and die-off ...
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received: 13 November 2015 accepted: 28 January 2016 Published: 12 February 2016
Seasonal variability of faecal indicator bacteria numbers and die-off rates in the Red River basin, North Viet Nam Huong Thi Mai Nguyen1,2, Quynh Thi Phuong Le1, J. Garnier3, J.-L. Janeau4 & E. Rochelle-Newall2 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
