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Article type: Research Article
Authors: Lee, Choon-Weng | Bong, Chui-Wei
Affiliations: Laboratory of Microbial Ecology, Institute of Biological Sciences (Microbiology), Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
Note: [] Corresponding author. E-mail: [email protected]
Abstract: This study was carried out at an inter-tidal site at Cape Rachado (02°24′48N, 101°51′31E, Fig. 1) from April 2003 until April 2004. A small mangrove forest populated with Sonneratia and Rhizophora trees was located nearby. Bacterial respiration ranged 0.818–3.208μM O_2h^{-1}, and the amount of carbon respired was 9.80–38.44μg C L^{-1} h^{-1}. Concurrent bacterial production during the incubation was 1.23–3.28μg C L^{-1} h^{-1}. Using both these respiration and production values, we calculated the bacterial growth efficiency, and it ranged 4.0–11.1%. The low growth efficiency indicated the lower substrate quality here. However adding nutrients did not significantly increase bacterial growth rates (Student's t-test for matched pairs: t=1.883, df=2, p>0.10). In this study, protists consumed 0.49–5.72×10^4 bacterial cells mL^{-1} h^{-1} or 22 ± 15% of bacterial production. In carbon equivalents, grazing ranged 0.15– 1.81μg C L^{-1} h^{-1}. Annual bacterial production at this site is 42.7 g C m^{-3} yr^{-1}, and carbon consumed by the bacteria was estimated at 585 g C m^{-3} yr^{-1}. Of this, only 8 g C m^{-3} yr^{-1} was channeled onto protists. These calculations showed that effectively only 1% of the carbon consumed by bacteria was passed onto protists. The role of bacteria here was essentially that of a remineralizer, and as a sink for carbon.
Keywords: Bacterial carbon flux, bacterial carbon transfer, bacterial carbon demand, carbon sink, Straits of Malacca
Journal: Asian Journal of Water, Environment and Pollution, vol. 4, no. 1, pp. 11-16, 2007
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