Longitudinal shifts in dissolved organic matter chemogeography and chemodiversity within headwater streams: a river continuum reprise

Mosher, Jennifer J.; Kaplan, Louis; Podgorski, David C.; McKenna, Amy M.; Marshall, Alan G.

doi:10.1007/s10533-015-0103-6

Cited by 69 publications

(74 citation statements)

References 86 publications

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“…Using a multivariate approach similar to PCA with optical fluorescence analysis results, Podgorski et al () also found that components of DOC in wells downgradient of a petroleum release become more similar to those in an upgradient well due to biotransformation. Bacterial transformation of organic matter to a common pool of compounds as water moves downgradient from inputs of organic matter is consistent with naturally occurring compounds in other aquatic systems (Mosher et al ; Kellerman et al ).…”

Section: Discussionsupporting

confidence: 68%

“…For example, comparing the occurrence versus absence of compounds identified by nontargeted analysis is a recognized approach for prioritizing chemicals for further investigation (Schwarzbauer and Ridking ; Hoh et al ; Hollender et al ). Such occurrence/absence assessments are commonly used when characterizing DOC from different aquatic systems and are a recognized basis for comparing complex mixtures using statistical multivariate analysis (Sleighter et al ; Minor et al ; Mosher et al ; Kujawinski et al ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Oxygen‐Containing Compounds Identified in Groundwater from Fuel Release Sites Using GCxGC‐TOF‐MS

O’Reilly

Mohler

Zemo³

et al. 2019

Groundwater Monitoring Rem

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This research continues a 7‐year study of oxygen‐containing organic compounds present in groundwater at gasoline and diesel fuel release sites that are quantified as diesel‐range “total petroleum hydrocarbons” when measured by methods utilizing solvent extraction and gas chromatography. Two‐dimensional gas chromatography with time‐of‐flight mass spectrometry was used to tentatively identify 1162 compounds (TICs) in 113 groundwater samples from 22 sites. Samples were collected from wells either upgradient of the release, within the source zone, or downgradient of the source but still within the plume of dissolved organics associated with release. The names and formulas of all TICs found in samples from each well type are presented and the results from upgradient and downgradient locations are compared in detail. About 60% of the most frequently detected TICs in downgradient wells were also detected in upgradient wells. A majority of these were saturated straight chain alkyl acids, commonly called fatty acids, or fatty acid esters. Of TICs frequently detected in downgradient wells but not upgradient wells, over half were branched alkyl alcohols. Hierarchical cluster analysis results suggest about 80% of the chemical composition of downgradient samples is more similar to upgradient samples than to source area samples. This similarity is due to the presence of the same types of fatty acids and esters. Principal component analysis indicates a continuum of biodegradation between the source area and downgradient samples with the latter becoming more consistent with upgradient samples. Results suggest some TICs may not be petroleum degradation intermediates but compounds synthesized by microorganisms through secondary production and carbon cycling.

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Section: Discussionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Oxygen‐Containing Compounds Identified in Groundwater from Fuel Release Sites Using GCxGC‐TOF‐MS

O’Reilly

Mohler

Zemo³

et al. 2019

Groundwater Monitoring Rem

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show abstract

“…The study of DOC processing is intimately linked to the pool of dissolved organic compounds in the water. Indeed, stream dissolved organic matter (DOM) is a mixture of thousands of molecules with different origin and reactivity (Mosher et al, ; Sleighter et al, ) that shapes the structure and function of microbial communities inhabiting streams (Freixa et al, ; Ruiz‐González et al, ; Wymore et al, ). The complexity of DOM composition challenges the methodological approach to study in‐stream DOC processing.…”

Section: Introductionmentioning

confidence: 99%

Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams

Catalán

Casas-Ruiz

Arce

et al. 2018

Global Biogeochemical Cycles

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Large variability in dissolved organic carbon (DOC) uptake rates has been reported for headwater streams, but the causes of this variability are still not well understood. Here we assessed acetate uptake rates across 11 European streams comprising different ecoregions by using whole‐reach pulse acetate additions. We evaluated the main climatic and biogeochemical drivers of acetate uptake during two seasonal periods. Our results show a minor influence of sampling periods but a strong effect of climate and dissolved organic matter (DOM) composition on acetate uptake. In particular, mean annual precipitation explained half of the variability of the acetate uptake velocities (VfAcetate) across streams. Temperate streams presented the lowest VfAcetate, together with humic‐like DOM and the highest stream respiration rates. In contrast, higher VfAcetate were found in semiarid streams, with protein‐like DOM, indicating a dominance of reactive, labile compounds. This, together with lower stream respiration rates and molar ratios of DOC to nitrate, suggests a strong C limitation in semiarid streams, likely due to reduced inputs from the catchment. Overall, this study highlights the interplay of climate and DOM composition and its relevance to understand the biogeochemical mechanisms controlling DOC uptake in streams.

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“…Understanding the role of C in fluvial systems requires knowledge of the inputs, losses, and transformations of OC along its longitudinal transit. Advanced approaches are confirming the highly reactive nature of DOM at the soil–water interface, for example, with MS (Mosher et al ) and in situ sensors (Pollard et al, ). There is also mounting evidence that water residence time (WRT; Table ) is of paramount importance in predicting the molecular composition (Kothawala et al ; Kellerman et al ) and reactivity of DOM (Catalán et al ; Evans et al ).…”

Section: Future Directionsmentioning

confidence: 99%

Biogeochemical tools for characterizing organic carbon in inland aquatic ecosystems

McCallister

Ishikawa

Kothawala

2018

Limnol Oceanogr Letters

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Integration of inland waters into regional and global carbon (C) budgets requires a comprehensive understanding of factors regulating organic carbon (OC) delivery and in situ processing. This study reviews advances in optical, molecular, and isotopic approaches to resolve the sources, ages, and transformations of OC in aquatic systems. OC characterization using excitation emission matrix spectra, Fourier transform ion cyclotron mass spectrometry, and nuclear magnetic resonance provides detailed molecular level insight. Radiocarbon isotopic approaches and compound‐specific techniques resolve the input, metabolic fate, and turnover time of OC in ecosystems ranging in size from streams to the open ocean. Accumulating evidence suggests that aquatic OC is composed of diverse biogeochemical components. We conclude with enduring and emerging questions that underscore the role of inland systems in the global C cycle and propose unique combinations of approaches to better discern their role in the delivery and transformation of OC from soils to seas.

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Longitudinal shifts in dissolved organic matter chemogeography and chemodiversity within headwater streams: a river continuum reprise

Cited by 69 publications

References 86 publications

Oxygen‐Containing Compounds Identified in Groundwater from Fuel Release Sites Using GCxGC‐TOF‐MS

Oxygen‐Containing Compounds Identified in Groundwater from Fuel Release Sites Using GCxGC‐TOF‐MS

Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams

Biogeochemical tools for characterizing organic carbon in inland aquatic ecosystems

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