Molecular characterization of proteinaceous material in the Florida coastal Everglades

Jones, Vera; Parish, Kathleen; Thomson, A E; Wolff, George A.; Maie, Nagamitsu; Jaffé, Rudolf

doi:10.1007/s10750-006-0127-y

Cited by 5 publications

(2 citation statements)

References 20 publications

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“…In contrast, LMW‐DON is likely to associate with fine particles, and, indeed, only about 40% was present in coarse particles. Wedyan and Preston [2008], and Jones et al [2006] reported that LMW‐DON is composed of marine‐derived amino acids and derivatives of low molecular weight proteins. The results suggest that aerosols derived from sea spray have a major influence on the distribution of LMW‐DON in atmospheric particles, but experimental confirmation of this suggestion is required.…”

Section: Resultsmentioning

confidence: 99%

Size fractionation and molecular composition of water‐soluble inorganic and organic nitrogen in aerosols of a coastal environment

Chen

Chiang

et al. 2010

J. Geophys. Res.

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[1] This study reports the first high and low molecular weight measurements of dissolved organic nitrogen (DON) in size-fractionated atmospheric particles. The variations in concentration of nitrogen species corresponded to varying sources and weather conditions. The results indicate that continental, local, and marine origins are the key factors controlling the particle size distribution of inorganic and organic nitrogen species. For dissolved inorganic nitrogen and DON, relatively high concentrations and fine-mode particle (particle diameter <1 mm) enrichment were significantly affected by continental and locally derived sources, which were mainly attributable to anthropogenic activities. However, the coarse/fine ratios indicate that DON was derived from a coarse particle (particle diameter >1 mm) source that may be sea salt particles. To investigate the possible sources of DON, an ultrafiltration method was used to separate DON into high (HMW) and low (LMW) molecular weight categories. The results indicate that HMW-DON and LMW-DON contributed 57 ± 9% and 43 ± 9%, respectively, to the total DON concentration. Correlations and positive matrix factorization analysis of HMW-DON and LMW-DON levels with major and non-sea-salt ions indicated that HMW-DON and LMW-DON in coarse particles may be generated from continental soil dust and sea spray, respectively, whereas, in fine particles, DON may originate from aerosols derived from combustion processes. The annual fluxes of HMW-DON and LMW-DON were estimated to be 11.0 and 11.3 mmol m −2 yr −1 , respectively. Consequently, the inputs of HMW-DON and LMW-DON appear to make equal contributions to DON in aerosols over the studied coastal area.

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Section: Resultsmentioning

confidence: 99%

Size fractionation and molecular composition of water‐soluble inorganic and organic nitrogen in aerosols of a coastal environment

Chen

Chiang

et al. 2010

J. Geophys. Res.

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“…5.3 (Ex: 275 nm; Em: 335 nm). Since the MW of proteinaceous materials might be different from other materials such as tannins, producing the protein-like peak (T-peak: Ex 280 nm; Em 325 nm) Hernes and Hedges, 2004;Jones et al, 2006), I applied SEC to determine the distribution of the protein-like fluorescence along the molecular weight continuum (Fig. 5.4).…”

Section: Preliminary Finding On Free Form Gallic Acid In Flocculent Smentioning

confidence: 99%

Sources, Fate and Transformation of Organic Matter in Wetlands and Estuaries

Ya¹

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In this work, DOM characteristics were investigated in different estuaries.Dissolved organic matter source strengths and dynamics were assessed in a seagrassdominated subtropical estuarine lagoon. The primary source of DOM was quantified using the combination of excitation emission matrix fluorescence with parallel factor analysis (EEM-PARAFAC) and stable C isotope analysis. Seagrass can contribute up to 72% of the DOM in the study area. The spatial and temporal variation of DOM dynamics viii was also studied in salt marsh estuary. The data showed that DOM was primarily derived from freshwater marshes and controlled by hydrology while salt marsh plants play a significant role in the distribution patterns of DOM quality and quantity. The OM dynamics was also investigated in a mangrove-dominate estuary and a comparative study was conducted between the DOM and POM pools. The results revealed both similarity and dissimilarity in DOM and POM composition. The dynamics of both OM pools are largely uncoupled as a result of source differences. Fringe mangrove export similar amounts of DOM and POM and should be considered as an important source in coastal C budgets. Lastly, chemical characterizations were conducted on the featured fluorescence component in OM in an attempt to better understand the composition and origins of the specific PARAFAC component. The traditionally defined 'protein-like' fluorescence was found to contain both proteinaceous and phenolic compounds, suggesting that the application of this parameter as a proxy for amino acid content and bioavailability may be limited.

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A synthesis of long-term research by the Florida Coastal Everglades LTER Program

Childers

2006

Hydrobiologia

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This paper synthesizes research conducted during the first 5-6 years of the Florida Coastal Everglades Long-Term Ecological Research Program (FCE LTER). My objectives are to review our research to date, and to present a new central theme and conceptual approach for future research. Our research has focused on understanding how dissolved organic matter (DOM) from upstream oligotrophic marshes interacted with a marine source of the limiting nutrient, phosphorus (P), to control productivity in the oligohaline estuarine ecotone. We have been working along freshwater to marine transects in two drainage basins located in Everglades National Park (ENP). The Shark River Slough transect (SRS) has a direct connection to the Gulf of Mexico, providing this estuarine ecotone with a source of marine P. The oligohaline ecotone along our southern Everglades transect (TS/Ph), however, is separated from this marine P source by the Florida Bay estuary. We originally hypothesized an ecosystem productivity peak in the SRS ecotone, driven by the interaction of marine P and Everglades DOM, but no such productivity peak in the TS/Ph ecotone because of this lack of marine P. Our research to date has tended to show the opposite pattern, however, with many ecosystem components showing enhanced productivity in the TS/Ph ecotone, but not in the SRS ecotone. Water column P concentrations followed a similar pattern, with unexpectedly high P in the TS/Ph ecotone during the dry season. Our organic geochemical research has shown that Everglades DOM is more refractory than originally hypothesized. We have also begun to understand the importance of detrital organic matter production and transport to ecotone dynamics and as the base of aquatic food webs. Our future research will build on this substantial body of knowledge about these oligotrophic estuaries. We will direct our efforts more strongly on biophysical dynamics in the oligohaline ecotone regions. Specifically, we will be focusing on inputs to these regions from four primary water sources: freshwater Everglades runoff, net precipitation, marine inputs, and groundwater. We are hypothesizing that dry season groundwater inputs of P will be particularly important to TS/Ph ecotone dynamics because of longer water residence times in this area. Our organic geochemical, biogeochemical, and ecosystem energetics work will focus more strongly on the importance of detrital organics and will take advantage of a key Everglades Restoration project, scheduled for 2008 or 2009, that will increase freshwater inputs to our SRS transect only. Finally, we will also begin to investigate the human dimensions of restoration, and of a growing population in south Florida that will become increasingly dependent on the Everglades for critical ecosystem services (including fresh water) even as its growth presents challenges to Everglades sustainability.

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Molecular characterization of proteinaceous material in the Florida coastal Everglades

Cited by 5 publications

References 20 publications

Size fractionation and molecular composition of water‐soluble inorganic and organic nitrogen in aerosols of a coastal environment

Size fractionation and molecular composition of water‐soluble inorganic and organic nitrogen in aerosols of a coastal environment

Sources, Fate and Transformation of Organic Matter in Wetlands and Estuaries

A synthesis of long-term research by the Florida Coastal Everglades LTER Program

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