The coupling of bacterial production and hydrography in the southern East China Sea: Spatial patterns in spring and fall
Resource
Continental Shelf Research 20 (4-5): 459-477
Journal
Continental Shelf Research
Pages
459-477
Date Issued
2000
Date
2000
Author(s)
Shiah, Fuh-Kwo
Liu, Kon-Kee
Kao, Shuh-Ji
Gong, Gwo-Ching
Abstract
Heterotrophic bacterial biomass, production and turnover rates were investigated in a transect across the continental shelf of the southern East China Sea during spring and fall. The sampling area covered different water types including nutrient-rich coastal and upwelling waters as well as oligotrophic Kuroshio waters. On area basis, bacterial biomass (IBB; 350-1200 mgC m-2), production (IBP; 28-329 mgC m-2 d-1) and averaged turnover rates (μ = IBP/IBB; 0.09-0.22 d-1) in the coastal and upwelling areas were at least 2-fold of those in the Kuroshio waters. IBB, IBP and μ were positively correlated with primary production (IPP; 90-2133 mgC m-2 d-1) and particulate organic carbon (IPOC; 1415-4682 mgC m-2) but showed a negative trend with temperature in the outer shelf area. While in the inner shelf (<20°C), IBP and μ were positively correlated with temperature; the Q10 value for bacterial μ was 3.12. These indicated that the spatial patterns of IBB, IBP and μ were more likely to be controlled by substrate supply and temperature interactively. Values of IBP: IPP ratio ranged 6-42% with an average of 22 ± 10%. Under the assumption of a growth efficiency of 20%, shelf bacteria might consume carbon equivalent to almost 100% of the in situ daily particulate IPP. Dissolved organic carbon from non-phytoplankton and allochothonous sources might play a significant role in supporting bacterial carbon demand in the shelf area of the East China Sea. (C) 2000 Elsevier Science Ltd.
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Type
journal article
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