Environmental factors influencing the distribution of total and fecal
coliform bacteria in six water storage reservoirs in the
Pearl River Delta Region, China |
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Authors: | Huachang Hong Jianwen Qiu and Yan Liang |
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Institution: | 1. College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China 2. Croucher Institute for Environmental Sciences and the Department of Biology, Hong Kong Baptist University,Kowloon Tong, Hong Kong, China |
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Abstract: | The Pearl River Delta (PRD) is one of the most developed and densely populated regions in China. Quantifying the amount of
pathogens in the source of drinking water is important for improving water quality. We collected water samples from six major water
storage reservoirs in the PRD region in both wet and dry seasons in 2006. Results showed that external environmental factors, such as
precipitation, location, as well as the internal environmental factors, i.e., physicochemical properties of the water, were closely related
with the distribution of coliforms. Seasonally, the coliform bacterial concentrations in wet season were one to two orders of magnitude
greater than those in dry season. Spatially, coliform bacterial levels in reservoirs near urban and industrial areas were significantly
higher (p < 0.05) than those in remote areas. Correlation analyses showed that the levels of coliforms had close relationships with pH,
temperature, suspended solid, organic and inorganic nutrients in water. Principal components analysis further demonstrated that total
coliforms in the reservoirs were closely related with water physicochemical properties, while fecal coliforms were more associated with
external input brought in by seasonal runo . |
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Keywords: | bacteria location rainfall physicochemical parameters reservoir |
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