墾丁國家公園海域長期生態研究 - 整合與模式建構─南灣海域上層水體生物源有機碳循環及物理流場之研究-II(1/2)
Date Issued
2003
Date
2003
Author(s)
夏復國
DOI
912621B002012
Abstract
To 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 mM) 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 mg l-1. Daily euphotic zone integrated primary production (IPPZe, 118 ~ 389
mgC m-2 d-1) and algal turnover rate (Pm, 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, Pm 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 auto- and heterotrophic
planktoners.
Subjects
Dissolved inorganic nutrients
chlorophyll
POC
C-limitation
conveyor-belt hypothesis
tidal cycle
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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