AME 76:207-217 (2016)  -  DOI: https://doi.org/10.3354/ame01778

Bacterial influence on chromophoric dissolved organic matter in coastal waters of the northern South China Sea

Xiangcheng Yuan1,2,*, Weihua Zhou1,2,3,*, Hui Huang1,2,3, Tao Yuan1,2, Xiubao Li1,2, Weizhong Yue1, Yongli Gao1,2, Sheng Liu1,2, Gang Pan1, Hongbin Liu4, Kedong Yin5, Paul J. Harrison4

1Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 51000, PR China
2Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 51000,PR China
3Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, PR China
4Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong SAR
5School of Marine Sciences, Zhong Shan (Sun Yat-Sen) University, Guangzhou 51000, PR China
*‑Corresponding author: ,

ABSTRACT: Chromophoric dissolved organic matter (CDOM), bacterial production (BP) and phytoplankton biomass (chl a) were investigated at 2 coastal sites in the northern South China Sea during summer 2011. Our data showed that chl a levels were higher in Hong Kong eastern waters (HKEW) than Sanya Bay (SYB), but CDOM exhibited the opposite pattern. This decoupling between surface CDOM and chl a indicates that phytoplankton biomass is not the determining factor affecting CDOM distribution. The low levels of CDOM in HKEW could be associated with upwelling of CDOM-deficient deep waters. In addition, bacteria produced more CDOM during the beginning of incubation experiments at SYB than at HKEW, although CDOM turnover time by bacteria was ~4 to 10 d and showed no significant difference between SYB and HKEW (p > 0.05). Addition of nitrogen shortened the CDOM turnover time by 2 fold at SYB. Upwelling likely resulted in a phosphorus deficiency for bacteria, and phosphorus enrichment increased bacterial abundance (BA) and BP at HKEW. Interestingly, nitrogen enrichment increased both BP and CDOM generation in SYB, but phosphorus enrichment did not change CDOM at either location, suggesting that CDOM distribution is more associated with nitrogen than phosphorus availability.


KEY WORDS: Bacterial production · BP · Bacterial abundance · BA · Bacterial respiration · BR · Chromophoric dissolved organic matter · CDOM · Upwelling


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Cite this article as: Yuan X, Zhou W, Huang H, Yuan T and others (2016) Bacterial influence on chromophoric dissolved organic matter in coastal waters of the northern South China Sea. Aquat Microb Ecol 76:207-217. https://doi.org/10.3354/ame01778

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