Changes in cell volume of bacteria and heterotrophic nanoflagellates in a hypereutrophic pond |
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Authors: | Nakano Shin-ichi Kawabata Zen'ichiro |
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Institution: | (1) Department of Ecosystem Conservation, Ehime University, Tarumi 3-5-7, Matsuyama, 790-8577 Ehime, Japan;(2) Present address: Center for Marine Environmental Studies, Ehime University, Bunkyo-cho 3, Matsuyama, 790-8577 Ehime, Japan;(3) The Center for Ecological Research, Kyoto University, Otsu, 520 Shiga, Japan |
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Abstract: | Changes in cell volume of planktonic bacteria and heterotrophic nanoflagellates (HNF) were examined in a hypereutrophic pond from April to October, 1997. There were marked changes in the abundance of bacteria, HNF and ciliates and in protistan bacterivory during this period. The cell volume of free-living bacteria (0.121 ± 0.031 m3, mean ± SD) was large relative to that reported in the literature. The cell volumes of HNF was 71.1 ± 24.8 m3. Both cell volumes did not follow a seasonal trend. The dominant size class of bacteria was seasonally variable, whereas density of filamentous bacteria was relatively high between August and September. Biomass of filamentous bacteria accounted for up to 33.6% of total bacterial biomass. A correlation analysis for cell volume of bacteria and HNF, density of filamentous bacteria and some microbial variates was performed. The positive correlations detected (p<0.05) were between density of bacteria and cell volume of HNF, and between density of filamentous bacteria and cell volume of HNF. |
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Keywords: | cell volume bacteria heterotrophic nanoflagellates trophic interaction hypereutrophic pond |
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