Optical characteristics of colored dissolved organic matter during blooms of Trichodesmium in the coastal waters off Goa

Environmental Monitoring and Assessment
Albertina DiasSuresh Thayapurath

Abstract

Trichodesmium, a marine cyanobacterium, plays a significant role in the global nitrogen cycle due to its nitrogen fixing ability. Large patches of Trichodesmium blooms were observed in the coastal waters, off Goa during spring intermonsoon (SIM) of 2014-2018. Zeaxanthin was the dominant pigment in the bloom region. Here, we present the spectral absorption and fluorescence characteristics of colored dissolved organic matter (CDOM) during these blooms. CDOM concentration was much higher in the bloom patches as compared with nonbloom regions. During the bloom spectral CDOM absorption had distinct peaks in the UV region due to the presence of UV-absorbing/screening compounds, mycosporine-like amino acids (MAAs) and in the visible region due to phycobiliproteins (PBPs). The spectral fluorescence signatures by the traditional peak picking method exhibited three peaks, one was protein-like, and the other two were humic-like. Apart from these, Trichodesmium exhibited strong protein-like fluorescence with 370/460 nm (Ex/Em), which is a signature of cyanobacteria. A parallel factor analysis (PARAFAC) on the fluorescence excitation-emission matrix (EEM) of Trichodesmium dataset fitted a 3-component model of which one was protein-like, and...Continue Reading

References

Oct 14, 2004·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Federico R CondeCarlos M Previtali
May 17, 2005·Journal of Photochemistry and Photobiology. B, Biology·Kenia Whitehead, John I Hedges
Jan 30, 2007·Chemical Reviews·Paula G Coble
Feb 9, 2007·FEMS Microbiology Letters·Aharon Oren, Nina Gunde-Cimerman
Apr 28, 2009·Biotechnology Advances·Rajesh P Rastogi, Rajeshwar P Sinha
Aug 15, 2009·Applied Spectroscopy·A J Lawaetz, C A Stedmon
Dec 14, 2011·Astrobiology·Lewis R DartnellJohn M Ward
May 7, 2013·The Science of the Total Environment·Jacob A FleckCharles N Alpers
Jun 13, 2017·Marine Pollution Bulletin·R JyothibabuK K Balachandran

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