Title Image analysis of bacterial cell size by diurnal changes in lake Soyang, Korea
Author Choi, Seung Ik * · Ahn, Tae Seok¹'² · Kato, Kenji³
Address Dept. of Environmental Health, Seonam University; ¹Dept. of Environmental Science, Kangwon National University; ²Research Center for Molecular Microbiology, Seoul National University; ³School of Allied Medical Sciences, Shinshu University
Bibliography Journal of Microbiology, 34(4),300-304, 1996,
Key Words Image analysis, bacterial biovolume, diurnal changes, Lake Soyang
Abstract To define the effects of zooplankton and phytoplankton to bacteria, bacterial numbers, frequency of dividing cells (FDC) and size distribution were performed with image analysis in the surface layer of Lake Soyang. In August 1992, when Anabaena was blooming, the bacterial number increased at daytime. Bacterial numbers and FDC value had a negative correlation (r = 0.83, P < 0.01). Bacterial size spectrums were dynamically changed during the day and night, especially the small bacteria less than 0.5 ㎛^3. Meanwhile, in October, after the bloom, the bacterial number was only one third of that in August, even though the FDC was higher than that in August. The bacterial numbers of small size class dropped at 13.00. But the size spectrums were relatively constant during the night time. These results suggest that the bacterial growth was tightly coupled with phytoplankton during Anabaena bloom. And after the bloom, the bacterial number was controlled grazing activity of zooplankton at daytime.
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