Show simple item record

dc.contributor.authorDias, A.
dc.contributor.authorKurian, S.
dc.contributor.authorSuresh, T.
dc.date.accessioned2020-12-31
dc.date.accessioned2021-02-09T10:13:16Z
dc.date.available2020-07-24
dc.date.available2021-02-09T10:13:16Z
dc.date.issued2020
dc.identifier.citationEnvironmental Monitoring and Assessment, vol.192(8); 2020; Article no: 526
dc.identifier.issn0167-6369
dc.identifier.otherhttp://link.springer.com/10.1007/s10661-020-08494-w
dc.identifier.urihttps://doi.org/10.1007/s10661-020-08494-w
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/8472
dc.descriptionIF2019 - 1.903
dc.description.abstractTrichodesmium, 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 (M A A s) a n d i n t h e v i s i b l e r e g i o n d u e t o 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 two were humic-like. The fluorescence index (FI) values during Trichodesmium bloom was very high (~ 3) compared with the typical range of 1.2-1.8 observed for the natural waters. Bloom degradation experiments proved that increase in tryptophan fluorescence enhances the CDOM absorption. Our study indicates that Trichodesmium blooms provide a rich source of organic matter in the coastal waters and long-term monitoring of these blooms is essential for understanding the health of ecosystem.
dc.languageen
dc.publisherSpringer
dc.relation.ispartofEnviron Monit Assess
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleOptical characteristics of colored dissolved organic matter during blooms of Trichodesmium in the coastal waters off Goa
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record