碩士 / 國立臺灣大學 / 海洋研究所 / 91 / To exam hourly responses of phytoplankton and heterotrophic bacteria to an upwelling caused by spring tide, a 2-days cruise with 11 occupied stations was conducted in the Nan-Wan Bay coral reef ecosystem in Feb. 2001. Nitrate concentrations (NO3, <0.2 ~ 10.2 M) correlated negatively with temperature (16 ~ 26 oC). Estimated NO3 flux was ~ 30 mmolN m-2 h-1 with <1% of it utilized by phytoplankton. Chlorophyll a (Chl) 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 quick tidal mixing and 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 (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 particulate organic carbon (540 ~ 6575 mgC m-2) concentrations, 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 encompasses the turnover times of auto- and heterotrophic planktoners.
| Identifer | oai:union.ndltd.org:TW/091NTU00279034 |
| Date | January 2003 |
| Creators | 李國源 |
| Contributors | 夏復國 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 49 |
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