Temporal and spatial distribution of virioplankton in large shallow freshwater lakes |
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| Authors: | Kai Cheng Da Pei Yijun Zhao Fengxia Deng Wei Liu Jin Zhao |
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| Institution: | 1. Hubei Key Laboratory of Urban Water Environmental Ecology, Central China Normal University, Wuhan, 430079, China
2. State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China
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| Abstract: | Virioplankton dynamics at seven sample sites (from two freshwater lakes) with different trophic states were monitored over
the period of a year. Water was sampled monthly from August 2004 to July 2005, and the abundances of viruses and bacteria
were measured using direct epifluorescence microscopy counting. Results indicated that both natural and anthropogenic factors
could influence the distribution of virioplankton. Temporally, viral abundance was significantly correlated to bacterial density
and water temperature. Spatially, viral abundance was significantly correlated to trophic state. This in turn indicated that
viral abundance was directly dependant on host abundance in eutrophic lakes, while trophic state and temperature could drive
the distribution of virioplankton. The virus-bacteria ratio was significantly lower in less productive water-bodies. The result
implied that the control of virioplankton on their hosts may change according to the host density. |
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