Dynamics of attached bacteria at the water-sediment interface in a mesotrophic swampy bog of Japan |
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| Authors: | Motoo Utsumi Yukihiro Nojiri Nozomi Ytow Humitake Seki |
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| Institution: | (1) National Institute for Environmental Studies, 16-2 Onogawa, 305 Tsukuba, Ibaraki, Japan;(2) Institute of Biological Sciences, University of Tsukuba, 1-1-1 Tennoudai, 305 Tsukuba, Ibaraki, Japan |
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| Abstract: | The population dynamics of attached bacteria at the water-sediment interface were studied in a mesotrophic swampy bog, Matsumi-ike,
near Tsukuba, Japan. The density of attached bacteria was higher at the sediment boundary layer than in the water column,
and low inside the sediment (deeper, than 10 mm below the sediment surface) throughout the year. The density of bacteria attached
on the glass slide was highest during spring when the source of organic matter in the water column was mainly withered cattail,
and gradually decreased toward summer, while the phytoplankton became the dominant source of organic matter in the water column.
The epibacterial populations in the water column and at the boundary showed almost the same seasonal fluctuation in attachment
and detachment rates. However, bacterial growth rates did not show the same seasonal fluctuation, and annual average growth
rates on the glass slides were all lower than that of bacterioplankton (free-living bacteria in water) in the water column. |
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| Keywords: | Attached bacteria bacterial population dynamics swampy bog water-sediment interface organic nutrients bacterial attachment rate bacterial detachment rate |
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