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Seasonal hyporheic dynamics control coupled microbiology and geochemistry in Colorado River sediments

Journal Article · · Journal of Geophysical Research. Biogeosciences
DOI:https://doi.org/10.1002/2016JG003527· OSTI ID:1425414
 [1];  [2];  [3];  [4];  [3];  [5]
  1. The Ohio State Univ., Columbus, OH (United States). Dept. of Microbiology
  2. The Ohio State Univ., Columbus, OH (United States). School of Earth Sciences
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Sciences
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Biological Sciences Division
  5. The Ohio State Univ., Columbus, OH (United States). Dept. of Microbiology and School of Earth Sciences
Riverbed microbial communities play an oversized role in many watershed ecosystem functions, including the processing of organic carbon, cycling of nitrogen, and alterations to metal mobility. The structure and activity of microbial assemblages depend in part on geochemical conditions set by river-groundwater exchange or hyporheic exchange. In order to assess how seasonal changes in river-groundwater mixing affect these populations in a snowmelt-dominated fluvial system, vertical sediment and pore water profiles were sampled at three time points at one location in the hyporheic zone of the Colorado River and analyzed by using geochemical measurements, 16S rRNA gene sequencing, and ecological modeling. Oxic river water penetrated deepest into the subsurface during peak river discharge, while under base flow conditions, anoxic groundwater dominated shallower depths. Over a 70 cm thick interval, riverbed sediments were therefore exposed to seasonally fluctuating redox conditions and hosted microbial populations statistically different from those at both shallower and deeper locations. Additionally, microbial populations within this zone were shown to be the most dynamic across sampling time points, underlining the critical role that hyporheic mixing plays in constraining microbial abundances. Given such mixing effects, we anticipate that future changes in river discharge in mountainous, semiarid western U.S. watersheds may affect microbial community structure and function in riverbed environments, with potential implications for biogeochemical processes in riparian regions.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC02-05CH11231; AC06-76RL01830
OSTI ID:
1425414
Alternate ID(s):
OSTI ID: 1402140
Journal Information:
Journal of Geophysical Research. Biogeosciences, Journal Name: Journal of Geophysical Research. Biogeosciences Journal Issue: 12 Vol. 121; ISSN 2169-8953
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Microbial communities across a hillslope‐riparian transect shaped by proximity to the stream, groundwater table, and weathered bedrock journal May 2019
Wetland Conditions Differentially Influence Nitrogen Processing within Waterfowl Impoundments journal November 2019
Microbial and Reactive Transport Modeling Evidence for Hyporheic Flux‐Driven Cryptic Sulfur Cycling and Anaerobic Methane Oxidation in a Sulfate‐Impacted Wetland‐Stream System journal January 2020
Hyporheic Zone Microbiome Assembly Is Linked to Dynamic Water Mixing Patterns in Snowmelt‐Dominated Headwater Catchments journal November 2019
Heterogeneity in Hyporheic Flow, Pore Water Chemistry, and Microbial Community Composition in an Alpine Streambed journal November 2019
River channel connectivity shifts metabolite composition and dissolved organic matter chemistry journal January 2019
Microbial Community Cohesion Mediates Community Turnover in Unperturbed Aquifers journal July 2018
Members of the Candidate Phyla Radiation are functionally differentiated by carbon- and nitrogen-cycling capabilities journal September 2017
Assessing the effect of flood restoration on surface–subsurface interactions in Rohrschollen Island (Upper Rhine river – France) using integrated hydrological modeling and thermal infrared imaging journal January 2019

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