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

Abstract

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 maymore » affect microbial community structure and function in riverbed environments, with potential implications for biogeochemical processes in riparian regions.« less

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [3]; ORCiD logo [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
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1425414
Alternate Identifier(s):
OSTI ID: 1402140
Grant/Contract Number:  
AC02-05CH11231; AC06‐76RL01830; AC06‐76RLO 1830
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 121; Journal Issue: 12; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 59 BASIC BIOLOGICAL SCIENCES; hyporheic; beta‐NTI; fluvial sediments; biogeochemistry; 16S rRNA

Citation Formats

Danczak, Robert E., Sawyer, Audrey H., Williams, Kenneth H., Stegen, James C., Hobson, Chad, and Wilkins, Michael J. Seasonal hyporheic dynamics control coupled microbiology and geochemistry in Colorado River sediments. United States: N. p., 2016. Web. doi:10.1002/2016JG003527.
Danczak, Robert E., Sawyer, Audrey H., Williams, Kenneth H., Stegen, James C., Hobson, Chad, & Wilkins, Michael J. Seasonal hyporheic dynamics control coupled microbiology and geochemistry in Colorado River sediments. United States. doi:10.1002/2016JG003527.
Danczak, Robert E., Sawyer, Audrey H., Williams, Kenneth H., Stegen, James C., Hobson, Chad, and Wilkins, Michael J. Sat . "Seasonal hyporheic dynamics control coupled microbiology and geochemistry in Colorado River sediments". United States. doi:10.1002/2016JG003527. https://www.osti.gov/servlets/purl/1425414.
@article{osti_1425414,
title = {Seasonal hyporheic dynamics control coupled microbiology and geochemistry in Colorado River sediments},
author = {Danczak, Robert E. and Sawyer, Audrey H. and Williams, Kenneth H. and Stegen, James C. and Hobson, Chad and Wilkins, Michael J.},
abstractNote = {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.},
doi = {10.1002/2016JG003527},
journal = {Journal of Geophysical Research. Biogeosciences},
issn = {2169-8953},
number = 12,
volume = 121,
place = {United States},
year = {2016},
month = {12}
}

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