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KMID : 0364819880260030230
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Korean Journal of Microbiology
1988 Volume.26 No. 3 p.230 ~ p.236
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Distributions and heterotrophic activities of bacteria in Lake Paro
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Abstract
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1
The distributions of bacterial numbers and activities were studied bimonthly in 1987, at 3 sites in Lake Paro for elucidating the changes by disturbance of aquatic ecosystem.
The total bacterial number was 0.3 x 105-13.1 x 101 cells/ml. The beterootrophic bacterial number had the variance from 1.9 x 103 CFUs / ml to 3.1 x 104 CFUs / d and the variation trend was similar to that of the total bacterial number.
The proportions of alpha-glucosidase or beta-glucosidase releasing bacteria showed temporal changes rather than spatial changes. The proportions of phosphatase releasing bacteria had the maximum values, 22.7-83.0%, in July.
The electron transport system activity revealed the variation from 480μg02/1/day to 1696 μg02/ 1/day and higher values at upper stream and in summer. The degradation fraction by phosphatase was 0.4-9.1%/h and increased with temperature. The maximum value of heterotrophic activity was 8.2%/h in summer.
Eventhough the distributions of total bacteria and heterotrophic bacteria were affected by the water disturbance but microbial activities and proportions of the specific enzyme releasing bacteria were not affected.
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