Variation of dissolved organic matter and fluorescence characteristics before, during and after phytoplankton bloom

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),...

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Bibliographic Details
Published in:Journal of oceanography 2009-12, Vol.65 (6), p.835-846
Main Authors: Suksomjit, Marut, Nagao, Seiya, Ichimi, Kazuhiko, Yamada, Tatsuo, Tada, Kuninao
Format: Article
Language:English
Subjects:
3D-EEM
Coastal environments
Coastal waters
Dissolved organic carbon
Dissolved organic matter
DOC
DOM
DON
Earth and Environmental Science
Earth Sciences
Fluorescence
Freshwater & Marine Ecology
Marine
Matter & antimatter
Oceanography
Organic chemicals
Organic nitrogen
Original Articles
Phytochemicals
Phytoplankton
phytoplankton bloom
Plankton
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Summary: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.
ISSN:0916-8370
1573-868X
DOI:10.1007/s10872-009-0069-x