Variation of dissolved organic matter and fluorescence characteristics before, during and after phytoplankton bloom
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The variation of dissolved organic matter (DOM) and fluorescence characteristics during the phytoplankton bloom were investigated in Yashima Bay, at the eastern part of the Seto Inland Sea, Japan. We found significant accumulations of dissolved organic carbon (DOC), dissolved organic nitrogen (DON), chromophoric dissolved organic matter (CDOM) fluorescence, and UV260 during the phytoplankton bloom period in 2005, although lower accumulations of DOC and DON and only increases of CDOM fluorescence were observed during the bloom period in 2006. Little or no correlation between DOM and phytoplankton abundance might be due to the composition of DOM, which is a complex mixture of organic materials. The 3D-EEM results revealed that the DOM produced around the phytoplankton bloom period contained tyrosine, tryptophan, and humic-like substances. Our results showed that the occurrence of phytoplankton bloom contributed to the production of DOM in coastal water but the DOM accumulation depended on the type of phytoplankton bloom, the phytoplankton species in particular. From our results, we concluded that phytoplankton have a great role in the dynamics of DOM as a producer in a coastal environment.
KeywordsDOM DOC DON 3D-EEM phytoplankton bloom
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- Conan, P., M. Søndergaard, T. Kragh, F. Thingstad, M. Pujo-Pay, P. J. le B. Williams, S. Markager, G. Cauwet, N. H. Borch, D. Evans and B. Riemann (2007): Partitioning of organic production in marine plankton communities: the effects of inorganic nutrient ratios and community composition on new dissolved organic matter. Limnol. Oceanogr., 52, 753–765.CrossRefGoogle Scholar
- Hansell, D. A. and C. A. Carlson (2002): Biogeochemistry of Marine Dissolved Organic Matter. Academic Press, U.S.A., 774 pp.Google Scholar
- Hobbie, J. E., R. J. Daley and S. Jasper (1997): Use of nucleopore filters for counting bacteria by fluorescence microscopy. Appl. Environ. Microbial., 33, 1225–1228.Google Scholar
- Honjo, T. (2003): Heterosigma akashiwo (Red-tide species and the environmental conditions). p. 333–344. In Red Tides, ed. by T. Okaichi, Terra Scientific Publishing Company, Tokyo.Google Scholar
- Lorenzo, J. I., M. Nieto-Cid, X. A. Álvarez-Salgado, P. Pérez and R. Beiras (2007): Contrasting complexing capacity of dissolved organic matter produced during the onset, development and decay of a simulated bloom of the marine diatom Skeletonema costatum. Mar. Chem., 103, 61–75.CrossRefGoogle Scholar
- Nagao, S., T. Matsunaga, Y. Suzuki and K. Hiraki (2001): Convenient method of UV-absorbing organic materials in river waters by high-performance gel permeation chromatography. Chikyu-Kagaku, 35, 107–120 (in Japanese with English abstract).Google Scholar
- Nagata, T. (2000): Production mechanisms of dissolved organic matter. p. 121–152. In Microbial Ecology of the Oceans, ed. by D. L. Kirchman, Willey-Liss, New York.Google Scholar
- Strickland, J. D. H. and T. R. Parsons (1972): A Practical Handbook of Seawater Analysis (2nd). Fish. Res. Boar. Can. Bull., 167, 311 pp.Google Scholar
- Yamada, T. (1984): Study on the pollution load of Yashima Bay. Sci. Rep. Kagawa Pref. Fish. Exp. Stn., 21, 1–9 (in Japanese).Google Scholar