Abstract
The total viable count, population density of Escherichia coli and coliform bacteria, and nitrogen in the microbiomass (microbiomass-N) in sediments were monitored monthly at 12 points in the Ongagawa River basin from June 2002 to May 2006. The measurement of the sediment microbiomass-N was used for evaluation of the sediment’s microbial population in the river ecosystem. An extraordinarily high population of E. coli was observed during the season when there was stagnant water in the basin, with a high population and an insufficient drain diffusion system, and, thus hydrological water control is indispensable to prevent rapid E. coli growth. Microbiomass-N in sediments showed a negative correlation or independent fluctuation in relation to the bacterial population in the water column of the river. Seasonal changes in extracted nitrogen (N) in river sediments did not show correspondence with microbiomass-N in sediments. The microbiomass-N in sediments changed independently of the bacterial population in the river water, indicating that the high population of bacteria in the water does not lead to a high microbial population in river sediments. Ordination of the microbial parameters by canonical correspondence analysis (CCA) showed that microbiomass-N in sediments was quite different from other parameters. Relatively higher H+ (lower pH), PO4 3− concentration and dissolved oxygen (DO) were the determinant parameters of higher microbiomass-N in sediments. A relative microbial abundance between the water column and sediments as well as each of the microbial populations in the water column and sediments could be a quantitative parameter for evaluating the biochemical processes of stream water.
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Acknowledgments
The authors are grateful to Ms. K. Shikasho, Ms. E. Jikuya, Ms. Y. Yahata, Dr. T. Kadono, Mr. D. Sugiura, Mr. D. Miyamoto, Mr. Y. Suzuka, and Mr. Y. Tanaka for their assistance with experiments. The analysis of the samples was carried out at the Instrumentation Center of The University of Kitakyushu. This work was financially supported by a special research grant from the University of Kitakyushu.
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Nishihama, S., Haraguchi, A., Kawano, T. et al. Seasonal changes in the microbial population of the water column and sediments of the Ongagawa River, northern Kyushu, Japan. Limnology 9, 35–45 (2008). https://doi.org/10.1007/s10201-008-0236-6
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DOI: https://doi.org/10.1007/s10201-008-0236-6