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Title: Differential coupling of bacterial and primary production in mesotrophic and oligotrophic systems of the East China Sea
Authors: Fuh Kwo Shiah
Tzong Yueh Chen
Gwo Ching Gong
Chung Chi Chen
Kuo Ping Chiang
Jia Jang Hung
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: Bottom-up control
Continental shelf
East China Sea
Heterotrophic bacterioplankton
Inorganic nutrients
Primary production
Date: 2001-02
Issue Date: 2017-02-08T01:20:18Z
Publisher: Aquatic Microbial Ecology
Abstract: ABSTRACT: Spatial patterns of integrated bacterial production (IBP; 9 to 179 mg C m–2 d–1), bacterial biomass (IBB; 125 to 658 mg C m–2), bacterial turnover rates (Bµ = IBP/IBB; 0.03 to 0.37 d–1), primary production (IPP; 18 to 2079 mg C m–2 d–1) and hydrographical variables were measured in the continental shelf of the East China Sea (25.4 to 31.6° N, 120.5 to 127.0° E) during summer and autumn 1998. Sea surface temperatures were >21°C in both seasons. The slopes for Log10IBP vs Log10IPP (summer 0.44 ± 0.09, autumn 0.52±0.06) and Log10Bµ vs Log10IPP (summer 0.52 ± 0.06, autumn 0.50 ± 0.06) were significant with no seasonal difference. IBB showed no trend with IPP. When data were analyzed by separating the study area into the inner- (surface NO3 >0.25 µM; mesotrophic) and outer- (surface NO3 <0.25 µM; oligotrophic) shelf systems, the slope values of Log10IBP vs Log10IPP derived from the inner-shelf (summer 0.48 ± 0.25, 12 stations; autumn 0.52 ± 0.09, 16 stations) data sets were significantly higher than those of the outer-shelf (summer 0.27 ± 0.13, 20 stations; autumn 0.36 ± 0.11, 26 stations); there was no difference for the slopes between seasons within each system. Mechanisms causing such differential coupling are not clear since this issue has seldom been addressed before. The results implied that care should be taken when analyzing cross-system or large spatial scale data sets. Our study also revealed that the IBP:IPP ratios (4 to 57%) of both seasons showed negative relationships with IPP. Phytoplankton effects on these ratios were dominated concomitantly by algal turnover rate and biomass on the inner-shelf in summer and then shifted to algal biomass dominated over the whole shelf in autumn. Ecological and biogeochemical implications of our findings are discussed.
Relation: 23(3)
Appears in Collections:[Institute of Marine Environment and Ecology] Periodical Articles

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