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Groundwater–surface water mixing shifts ecological assembly processes and stimulates organic carbon turnover

Author

Listed:
  • James C. Stegen

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • James K. Fredrickson

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • Michael J. Wilkins

    (The Ohio State University
    School of Earth Sciences, The Ohio State University)

  • Allan E. Konopka

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • William C. Nelson

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • Evan V. Arntzen

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • William B. Chrisler

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • Rosalie K. Chu

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • Robert E. Danczak

    (The Ohio State University)

  • Sarah J. Fansler

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • David W. Kennedy

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • Charles T. Resch

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

  • Malak Tfaily

    (Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, USA)

Abstract

Environmental transitions often result in resource mixtures that overcome limitations to microbial metabolism, resulting in biogeochemical hotspots and moments. Riverine systems, where groundwater mixes with surface water (the hyporheic zone), are spatially complex and temporally dynamic, making development of predictive models challenging. Spatial and temporal variations in hyporheic zone microbial communities are a key, but understudied, component of riverine biogeochemical function. Here, to investigate the coupling among groundwater–surface water mixing, microbial communities and biogeochemistry, we apply ecological theory, aqueous biogeochemistry, DNA sequencing and ultra-high-resolution organic carbon profiling to field samples collected across times and locations representing a broad range of mixing conditions. Our results indicate that groundwater–surface water mixing in the hyporheic zone stimulates heterotrophic respiration, alters organic carbon composition, causes ecological processes to shift from stochastic to deterministic and is associated with elevated abundances of microbial taxa that may degrade a broad suite of organic compounds.

Suggested Citation

  • James C. Stegen & James K. Fredrickson & Michael J. Wilkins & Allan E. Konopka & William C. Nelson & Evan V. Arntzen & William B. Chrisler & Rosalie K. Chu & Robert E. Danczak & Sarah J. Fansler & Dav, 2016. "Groundwater–surface water mixing shifts ecological assembly processes and stimulates organic carbon turnover," Nature Communications, Nature, vol. 7(1), pages 1-12, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11237
    DOI: 10.1038/ncomms11237
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    Cited by:

    1. Liu, Jieyun & Qiu, Husen & He, Shuai & Tian, Guangli, 2024. "Long-term mulched drip irrigation facilitates soil organic carbon stabilization and the dominance of microbial stochastic assembly processes," Agricultural Water Management, Elsevier, vol. 302(C).

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