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Organic molecules are deterministically assembled in variably inundated river sediments, but drivers remain unclear

Journal Article · · Scientific Reports
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2]
  1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Washington State University, Pullman, WA (United States)
  2. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
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Dissolved organic matter (DOM) is central to ecosystem function. A fundamental challenge is understanding the processes leading to variation in the chemistry of organic molecules that comprise DOM. Here we study these processes in variably inundated riverbed sediments, as an understudied, yet ubiquitous component of rivers. Using null-model approaches adopted from community ecology, we found that within-site variation in environmental conditions caused non-random (i.e., deterministic) shifts in DOM chemistry. Deterministic shifts were observed across diverse biomes, though the strength of determinism varied substantially. We found that the strength of determinism decreased with increasing sediment moisture, but in the form of a constraint space. Many systems fell below the upper constraint boundary, however. We propose a conceptual model based on our results and other publications in which DOM assemblages are hypothesized to be increasingly deterministic across the continuum from the river water column to saturated sediment pore spaces to unsaturated and dry soils/sediments.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth & Environmental Systems Science (EESS)
Contributing Organization:
WHONDRS Consortium
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
2566029
Report Number(s):
PNNL-SA--189953
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 15; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Data and scripts associated with the manuscript "Organic Molecules are Deterministically Assembled in River Sediments"
  • Stegen, James C.; Garayburu-Caruso, Vanessa A.; Danczak, Robert E.
  • Environmental System Science Data Infrastructure for a Virtual Ecosystem; Early Career Research Program: Watershed Perturbation-Response Traits Derived Through Ecological Theory - Worldwide Hydrobiogeochemistry Observation Network for Dynamic River Systems (WHONDRS) https://doi.org/10.15485/2367553
dataset January 2024
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