Unifying Concepts Linking Dissolved Organic Matter Composition to Persistence in Aquatic Ecosystems
- Anne M. Kellerman*Anne M. Kellerman*E-mail: [email protected]National High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, United StatesMore by Anne M. Kellerman
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- François GuillemetteFrançois GuillemetteNational High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, United StatesMore by François Guillemette
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- David C. PodgorskiDavid C. PodgorskiNational High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, United StatesMore by David C. Podgorski
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- George R. AikenGeorge R. AikenU.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, United StatesMore by George R. Aiken
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- Kenna D. ButlerKenna D. ButlerU.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, United StatesMore by Kenna D. Butler
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- Robert G. M. SpencerRobert G. M. SpencerNational High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, United StatesMore by Robert G. M. Spencer
Abstract

The link between composition and reactivity of dissolved organic matter (DOM) is central to understanding the role aquatic systems play in the global carbon cycle; yet, unifying concepts driving molecular composition have yet to be established. We characterized 37 DOM isolates from diverse aquatic ecosystems, including their stable and radiocarbon isotopes (δ13C-dissolved organic carbon (DOC) and Δ14C-DOC), optical properties (absorbance and fluorescence), and molecular composition (ultrahigh resolution mass spectrometry). Isolates encompassed end-members of allochthonous and autochthonous DOM from sites across the United States, the Pacific Ocean, and Antarctic lakes. Modern Δ14C-DOC and optical properties reflecting increased aromaticity, such as carbon specific UV absorbance at 254 nm (SUVA254), were directly related to polyphenolic and polycyclic aromatic compounds, whereas enriched δ13C-DOC and optical properties reflecting autochthonous end-members were positively correlated to more aliphatic compounds. Furthermore, the two sets of autochthonous end-members (Pacific Ocean and Antarctic lakes) exhibited distinct molecular composition due to differences in extent of degradation. Across all sites and end-members studied, we find a consistent shift in composition with aging, highlighting the persistence of certain biomolecules concurrent with degradation time.
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