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Aquatic Microbial Ecology

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AME 60:247-260 (2010)  -  DOI:

Typhoon effects on DOC dynamics in a phosphate-limited reservoir

Yu-Fen Tseng1,*, Ting-Chang Hsu2,*, Yi-Lung Chen2,*, Shuh-Ji Kao2, Jiunn-Tzong Wu3, Ji-Chen Lu2, Chao-Chen Lai1,*, Hsiang-Yi Kuo4, Chih-Hsien Lin1,  Yoshimasa Yamamoto2, Tian Xiao5, Fuh-Kwo Shiah1,2,3,**

1Institute of Oceanography, National Taiwan University, Taipei, Taiwan, ROC
2Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan, ROC
3Institute of Marine Chemistry and Ecology, National Taiwan Ocean University, Keelong, Taiwan, ROC
4Research Center for Biodiversity, Academia Sinica, Taipei, Taiwan, ROC
5Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Science, Qindao, PR China
*These authors contributed equally to this article**Corresponding author. Email:

ABSTRACT: To explore typhoon effects on dissolved organic carbon (DOC) dynamics, field investigations (tributary and dam site) and laboratory experiments (bioassay and DOC consumption) were conducted in a subtropical reservoir. A tributary survey indicated that after typhoon disruption, upstream areas were the sources of phosphate (P) but not DOC for the dam site located downstream. Bioassay experiments verified P-limitation on bacteria and phytoplankton during summer stratification, and bacteria showed a faster response than algae to added P. Experiments indicated that DOC consumption was determined by the availability of P. The 4 yr typhoon period (June–September) data of the dam site denoted that DOC concentration (27 to 270 µM C) and its rate of change (–13 to 24 µM C d–1) varied more dramatically in the weak (2006 and 2007) than in the strong (2004 and 2005) typhoon years. The negative correlation of DOC with the ratio of bacterial production (BP) to primary production (PP) in the euphotic zone (0 to 10 m) signified the interactive effects of auto- and heterotrophic processes on DOC variation. In the aphotic zone, the variation of DOC could be ascribed to the change of BP, which showed a positive correlation with P concentrations. This study documents that DOC concentration in the studied system varied at multiple time scales. Such variation can be explained by the decoupling between BP and PP, which is believed to be a function of the limiting nutrient’s availability. More importantly, this study suggests that the P supply introduced by strong typhoons might have substantiated a tighter coupling between BP and PP, so that the amplitude of DOC oscillation during the summer period was effectively reduced.

KEY WORDS: DOC · Heterotrophic bacteria · Phytoplankton · Microbial loop

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Cite this article as: Tseng YF, Hsu TC, Chen YL, Kao SJ and others (2010) Typhoon effects on DOC dynamics in a phosphate-limited reservoir. Aquat Microb Ecol 60:247-260.

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