| Summary: | 碩士 === 國立臺灣大學 === 海洋研究所 === 93 === A survey of depth integrated averaged values of total heterotrophic bacterioplankton biomass (t-IBB, 9~19 mgC m-3), production (t-IBP, 3~52 mgC m-3 d-1), turnover rates ( t-IBu, 0.2~4.3 d-1) , heterotrophic nano-flagellate abundance ( 7.2~27 ×106 cells L-1) as well as concentrations of phosphate ( < 0.01 to 0.16 uM) were conducted in dam site of the Fei-Tsui reservoir weekly from March 2004 to March 2005. The result indicated that t-BB is strongly subjected to top-down control, and grazed by flagellates could be viewed as an important factor. T-bu in epilimnion ( shallower than 10 m) was mainly controlled by temperature during cold seasons ( < 23 ℃) . Phosphate supply but rather temperature might be important in regulating t-Bu in epilimnion during warm seasons ( > 23 ℃) as well as regulating t-Bu in hypolimnion ( deeper than 30 m ) all the time. Free-living bacteria accounted for most of the total biomass all the time, but attached bacteria were much more active than free-living bacteria on a per– cell basis except the middle of October in 2004 . During cold seasons, BP of two types had similar react toward temperature, nevertheless, attached bacterial turnover rate was much more intensely affected by temperature. In two substrate enrichment experiments, growth of attached bacteria had more intensive and faster responses than free-living bacteria when adding of phosphate. But additions of glucose alone failed to stimulate responses in growth of two type bacteria.
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