Groundwater–surface water mixing shifts ecological assembly processes and stimulates organic carbon turnover [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2016. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- Article numbers 11,237 : digital, PDF file
- Additional Creators:
- Pacific Northwest National Laboratory (U.S.), United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Environmental transition zones are associated with geochemical gradients that overcome energy limitations to microbial metabolism, resulting in biogeochemical hot spots 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. To investigate the coupling among groundwater-surface water mixing, microbial communities, and biogeochemistry we applied 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. Mixing of groundwater and surface water resulted in a shift from transport-driven stochastic dynamics to a deterministic microbial structure associated with elevated biogeochemical rates. While the dynamics of the hyporheic make predictive modeling a challenge, we provide new knowledge that can improve the tractability of such models.
- Published through SciTech Connect., 04/07/2016., "pnnl-sa--111962", "ncomms11237", Nature Communications 7 ISSN 2041-1723 AM, and 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; David W. Kennedy; Charles T. Resch; Malak Tfaily.
- Funding Information:
View MARC record | catkey: 23777568