夏復國2006-07-252018-06-282006-07-252018-06-282004http://ntur.lib.ntu.edu.tw//handle/246246/14853To exam hourly responses of phytoplankton and heterotrophic bacteria to an upwelling caused by spring tide, a 2-days cruise with 11 stations was conducted in the Nan-Wan Bay coral reef ecosystem in Feb. 2001. Nitrate concentrations (NO3, <0.15 ~ 10.2 µM) correlated negatively with temperature (16 ~ 26 oC). Estimated NO3 flux was ~60 mmolN m-2 h-1 with <1% of it utilized by phytoplankton. Chlorophyll (Chl-a) concentrations doubled in 9 hrs after the upwelling but with maximal concentrations <0.30 µg l-1. Daily euphotic zone integrated primary production (IPPZe, 118 ~ 389 mgC m-2 d-1) and algal turnover rate (Pµ, 0.27 ~ 0.76 d-1) responded to the upwelling ~5 hrs earlier than that of Chl-a. Such differential changes in growth rates and biomass accumulation could be explained by the “conveyor-belt” theory. The observed HNLC (High Nutrient Low Chlorophyll) phenomenon might due to shorter residence time of water mass (<1 d) within the Bay in comparison with those of algal turnover time (1.3 ~ 3.7 d). Euphotic zone integrated bacterial production (IBPZe; (7.2 ~3 9.7 mgC m-2 d-1) and bacterial turnover rate (0.56 ~ 0.82 d-1) were positively correlated with IPPZe, Pµ and depth integrated POC (540 ~ 6575 mgC m-2, suggesting a high possibility of “bottom-up” (organic substrate supply) control. This was confirmed by the results of 3 enrichment experiments showing that bacterial growth was C-limited. Our study provide mechanistic information regarding the magnitude of coupling among physical, chemical and biological process since the time scale adopted by this study was similar to the turnover time of autoand heterotrophic planktoners.application/pdf61503 bytesapplication/pdfzh-TW國立臺灣大學海洋研究所Dissolved inorganic nutrientschlorophyllPOCC-limitationconveyor-belt hypothesistidal cyclereporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/14853/1/922621B002004.pdf