Resolving DOM fluorescence fractions during a Karenia brevis bloom patch on the Southwest Florida Shelf

Mendoza, Wilson G.; Kang, Yoonja; Zika, Rod G.

doi:10.1016/j.csr.2011.11.001

Cited by 18 publications

(9 citation statements)

References 40 publications

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“…Regarding the spatial distribution of tryptophan-like fluorophore, its sources seemed to be essentially autochthonous. Maximal fluorescence intensity of the tryptophan-like component (60 QSU) is similar to that reported in the Southwest Florida Shelf (Mendoza et al, 2012) and is thought to be associated to an in-situ biological production other than bacteria activity. The presence of tryptophan-like fluorophore in the waters surrounding the coral reef could be linked to the biological activity of the coral reef ecosystem, as observed by in the Moorea lagoon, French Polynesia.…”

Section: Possible Releases Of Tryptophan-like From Coral Reefsupporting

confidence: 70%

“…The high production of tryptophan-like observed between transects 7 to 9 could also be associated with possible nutrient sources to produce a bloom of Trichodesmium (nitrogen fixing cyanobacteria in the Southwestern Tropical Pacific; Dupouy et al, 2011) observed during the cruise outside the barrier reef at passages transect 7 (Kouaoua) and transect 8 (Canala). A high correlation (r = 0.96) between the tryptophan consumption and the formation of harmful algal bloom of Karenia brevis has already been observed in the Southwest Florida shelf (Mendoza et al, 2012) and the same process could be occurred as likely in this area to explain the Trichodesmium bloom and the concentrations of tryptophan-like found (0.64-24 QSU). On the contrary, Steinberg et al (2004) assumed the CDOM production by Trichodesmium, which could also be a source of tryptophan-like fluorophore.…”

Section: Possible Releases Of Tryptophan-like From Coral Reefmentioning

confidence: 64%

“…EEMs were generated over excitation wavelengths (λ Ex ) between 220 and 550 nm in 5 nm intervals, and emission wavelengths (λ Em ) between 280 and 550 nm in 2 nm intervals, with 5 nm bandwidths on both Ex and Em sides. The scan speed was 1200 nm min −1 , the time response 0.5 s, and the PMT voltage 700 V (Tedetti et al, 2011;Mendoza et al, 2012). Spectral corrections for Ex and Em were made in accordance with the manufacturer (Hitachi F-7000 Instruction Manual), as described in Tedetti et al (2012).…”

Section: Cdom Fluorescencementioning

confidence: 99%

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Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Martias

Tedetti

Lantoine

et al. 2018

Science of The Total Environment

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The eastern lagoon of New Caledonia (NC, Southwest Pacific), listed as a UNESCO World Heritage site, hosts the world's second longest double-barrier coral reef. This lagoon receives river inputs, oceanic water arrivals, and erosion pressure from ultramafic rocks, enriched in nickel (Ni) and cobalt (Co). The aim of this study was to characterize colored dissolved organic matter (CDOM), as well as to determine its main sources and its possible relationships (through the use of Pearson correlation coefficients, r) with biogeochemical parameters, plankton communities and trace metals in the NC eastern lagoon. Water samples were collected in March 2016 along a series of river/lagoon/open-ocean transects. The absorption coefficient at 350nm (a) revealed the influence of river inputs on the CDOM distribution. The high values of spectral slope (S, >0.03m) and the low values of specific ultraviolet absorbance (SUVA, <4Lmg-Cm) highlighted the photodegradation of CDOM in surface waters. The application of parallel factor analysis (PARAFAC) on excitation-emission matrices (EEMs) allowed the identification of four CDOM components: (1) one humic- and one tyrosine-like fluorophores. They had terrestrial origin, exported through rivers and undergoing photo- and bio-degradation in the lagoon. These two fluorophores were linked to manganese (Mn) in southern rivers (r=0.46-0.50, n=21, p<0.05). (2) A tryptophan-like fluorophore, which exhibited higher levels offshore. It would be potentially released from the coral reef. (3) A second tyrosine-like ("tyrosine 2-like") fluorophore. Linked to Prochlorococcus cyanobacteria (r=0.39, n=47, p<0.05), this fluorophore would have an oceanic origin and enter in the lagoon through its southern and northern extremities. It also displayed relationships with Ni and Co content (r=0.53-0.54, n=21, p<0.05). This work underlines the diversity of CDOM sources in the NC eastern lagoon.

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Section: Possible Releases Of Tryptophan-like From Coral Reefsupporting

confidence: 70%

Section: Possible Releases Of Tryptophan-like From Coral Reefmentioning

confidence: 64%

Section: Cdom Fluorescencementioning

confidence: 99%

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Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Martias

Tedetti

Lantoine

et al. 2018

Science of The Total Environment

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“…Three components of DOM were identified based on the EEM-PARAFAC analysis (Figure a). The C1 component (Ex/Em maxima: 325/404 nm) was identified as a marine (autochthonous) humic-like component. − The C2 (Ex/Em maxima: 350/426 nm) and C3 (Ex/Em maxima: 370/480 nm) components were also identified as humic-like components. In some cases, fluorescence peaks that were similar to C2 and C3 were identified as terrestrial (allochthonous) humic-like components. ,, In other studies, these components were identified as degraded/diagenetic products of autochthonous OM. − No protein-like component could be identified by PARAFAC analysis.…”

Section: Resultsmentioning

confidence: 99%

Novel Insights into Dissolved Organic Matter Processing Pathways in a Coastal Confined Aquifer System with the Highest Known Concentration of Geogenic Ammonium

Deng

Liu

et al. 2021

Environ. Sci. Technol.

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High levels of geogenic ammonium in groundwater is a highly neglected nitrogen pool in coastal aquatic systems. Although organic matter (OM) mineralization is known to significantly influence geogenic ammonium enrichment, the detailed mechanism underlying ammonium enrichment based on dissolved organic matter (DOM) characterization in coastal aquifer systems remains unclear. In this study, we characterized the optical and molecular signatures of DOM coupled with hydrogeochemistry and multiple isotopes (H/O/C/N) to elucidate in detail the mechanisms underlying the anomalously high ammonium in the coastal confined aquifer system of the Pearl River Delta, which exhibits the highest reported geogenic ammonium concentration in groundwater on the Earth. We identified three DOM fluorescent components, a marine humic-like component (C1) and two other humic-like components (C2 and C3). The autochthonous OM was first processed to the C1 component, which was further transformed to C2 and C3 components. In terms of molecular classes, the processing pathway from bacterial- or algal-derived OM to aliphatic compounds and highly unsaturated-low O compounds was identified, and highly unsaturated-low O compounds were accumulated as the main products. Compounds containing two or three N atoms were processed, and compounds with one N atom gradually accumulated, which was further degraded into CHO compounds. The ammonium (up to 179 mg/L as N) was gradually enriched due to the decomposition of CHO+3N to CHO+2N, CHO+1N, and CHO compounds. Owing to the longer residence time and less frequent fresh water flushing, the produced ammonium was retained in the aquifer as a “long-term result”. The contrasting DOM characteristics, together with the differing depositional and hydrogeological conditions, give rise to the higher levels of geogenic ammonium in coastal confined aquifer systems compared with inland alluvial–lacustrine confined aquifer systems. To our knowledge, this is the first study to characterize DOM and its relationship with geogenic ammonium in coastal aquifer systems.

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“…The concentrations of dissolved organic carbon (DOC) in the bloom regions were significantly higher than those of non-bloom regions in Yeosu and Tongyeong of Korea 14 , 15 . The concentrations of fluorescent dissolved organic matter (FDOM) which is commonly composed of marine humic-like (FDOM M ), terrestrial humic-like (FDOM C ), and protein-like (FDOM T ) components also increased in HDB areas 14 , 16 , 17 . FDOM, which contributes about 20–70% of the DOC in coastal waters 18 , is known to play an important role in the outbreak of HDBs as it protects organisms from UV radiation and becomes an energy source for the growth of dinoflagellates 18 – 20 .…”

Section: Introductionmentioning

confidence: 99%

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ13C and d/l-Amino acid compositions

Park

Kim

Kwon

et al. 2022

Sci Rep

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We measured the concentrations of dissolved inorganic and organic nutrients, dissolved organic carbon (DOC), total hydrolyzable amino acids (THAA), fluorescent dissolved organic matter (FDOM), phytoplankton pigments, and δ13C-DOC during the summer of 2019 in the harmful dinoflagellate bloom regions of the southern coast of Korea. In the harmful dinoflagellate bloom region, the concentrations of inorganic nitrogen were depleted, inhibiting the growth of diatoms, while the concentrations of dissolved organic components (nutrients, DOC, FDOM, and amino acids) which fuel dinoflagellates were unusually high. Thus, we attempted to investigate the origins and characteristics of DOM which fuels the harmful dinoflagellate blooms. The δ13C-DOC values (− 22.2‰ to − 18.2‰) indicate that the elevated DOC concentrations result from in-situ biological production rather than terrestrial inputs. The enantiomeric (D/L) ratios of THAA indicate that dissolved organic nitrogen was more labile in the early stage of harmful dinoflagellate bloom and became more refractory in the final stage. Our results suggest that the marine production of bioavailable DOM plays an important role in initiating and sustaining harmful dinoflagellate blooms.

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Resolving DOM fluorescence fractions during a Karenia brevis bloom patch on the Southwest Florida Shelf

Cited by 18 publications

References 40 publications

Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Novel Insights into Dissolved Organic Matter Processing Pathways in a Coastal Confined Aquifer System with the Highest Known Concentration of Geogenic Ammonium

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ13C and d/l-Amino acid compositions

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