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Title: Snowmelt Induced Hydrologic Perturbations Drive Dynamic Microbiological and Geochemical Behaviors across a Shallow Riparian Aquifer

Abstract

Shallow riparian aquifers represent hotspots of biogeochemical activity in the arid western US. While these environments provide extensive ecosystem services, little is known of how natural environmental perturbations influence subsurface microbial communities and associated biogeochemical processes. Over a 6-month period we tracked the annual snowmelt-driven incursion of groundwater into the vadose zone of an aquifer adjacent to the Colorado River, leading to increased dissolved oxygen (DO) concentrations in the normally suboxic saturated zone. Strong biogeochemical heterogeneity was measured across the site, with abiotic reactions between DO and sulfide minerals driving rapid DO consumption and mobilization of redox active species in reduced aquifer regions. Conversely, extensive DO increases were detected in less reduced sediments. 16S rRNA gene surveys tracked microbial community composition within the aquifer, revealing strong correlations between increases in putative oxygen-utilizing chemolithoautotrophs and heterotrophs and rising DO concentrations. The gradual return to suboxic aquifer conditions favored increasing abundances of 16S rRNA sequences matching members of the Microgenomates (OP11) and Parcubacteria (OD1) that have been strongly implicated in fermentative processes. Microbial community stability measurements indicated that deeper aquifer locations were relatively less affected by geochemical perturbations, while communities in shallower locations exhibited the greatest change. Thus, reactive transport modeling ofmore » the geochemical and microbiological results supported field observations, suggesting that a predictive framework can be applied to develop a greater understanding of such environments.« less

Authors:
 [1];  [2];  [3];  [2];  [3];  [4]
  1. The Ohio State Univ., Columbus, OH (United States). Dept. of Microbiology
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Hydrology Group
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division
  4. 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) (SC-23)
OSTI Identifier:
1425411
Grant/Contract Number:  
AC02-05CH11231; AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Frontiers in Earth Science
Additional Journal Information:
Journal Volume: 4; Journal ID: ISSN 2296-6463
Publisher:
Frontiers Research Foundation
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Danczak, Robert E., Yabusaki, Steven B., Williams, Kenneth H., Fang, Yilin, Hobson, Chad, and Wilkins, Michael J. Snowmelt Induced Hydrologic Perturbations Drive Dynamic Microbiological and Geochemical Behaviors across a Shallow Riparian Aquifer. United States: N. p., 2016. Web. doi:10.3389/feart.2016.00057.
Danczak, Robert E., Yabusaki, Steven B., Williams, Kenneth H., Fang, Yilin, Hobson, Chad, & Wilkins, Michael J. Snowmelt Induced Hydrologic Perturbations Drive Dynamic Microbiological and Geochemical Behaviors across a Shallow Riparian Aquifer. United States. doi:10.3389/feart.2016.00057.
Danczak, Robert E., Yabusaki, Steven B., Williams, Kenneth H., Fang, Yilin, Hobson, Chad, and Wilkins, Michael J. Wed . "Snowmelt Induced Hydrologic Perturbations Drive Dynamic Microbiological and Geochemical Behaviors across a Shallow Riparian Aquifer". United States. doi:10.3389/feart.2016.00057. https://www.osti.gov/servlets/purl/1425411.
@article{osti_1425411,
title = {Snowmelt Induced Hydrologic Perturbations Drive Dynamic Microbiological and Geochemical Behaviors across a Shallow Riparian Aquifer},
author = {Danczak, Robert E. and Yabusaki, Steven B. and Williams, Kenneth H. and Fang, Yilin and Hobson, Chad and Wilkins, Michael J.},
abstractNote = {Shallow riparian aquifers represent hotspots of biogeochemical activity in the arid western US. While these environments provide extensive ecosystem services, little is known of how natural environmental perturbations influence subsurface microbial communities and associated biogeochemical processes. Over a 6-month period we tracked the annual snowmelt-driven incursion of groundwater into the vadose zone of an aquifer adjacent to the Colorado River, leading to increased dissolved oxygen (DO) concentrations in the normally suboxic saturated zone. Strong biogeochemical heterogeneity was measured across the site, with abiotic reactions between DO and sulfide minerals driving rapid DO consumption and mobilization of redox active species in reduced aquifer regions. Conversely, extensive DO increases were detected in less reduced sediments. 16S rRNA gene surveys tracked microbial community composition within the aquifer, revealing strong correlations between increases in putative oxygen-utilizing chemolithoautotrophs and heterotrophs and rising DO concentrations. The gradual return to suboxic aquifer conditions favored increasing abundances of 16S rRNA sequences matching members of the Microgenomates (OP11) and Parcubacteria (OD1) that have been strongly implicated in fermentative processes. Microbial community stability measurements indicated that deeper aquifer locations were relatively less affected by geochemical perturbations, while communities in shallower locations exhibited the greatest change. Thus, reactive transport modeling of the geochemical and microbiological results supported field observations, suggesting that a predictive framework can be applied to develop a greater understanding of such environments.},
doi = {10.3389/feart.2016.00057},
journal = {Frontiers in Earth Science},
number = ,
volume = 4,
place = {United States},
year = {2016},
month = {5}
}

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Cited by: 8 works
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    Works referencing / citing this record:

    Metatranscriptomic Analysis Reveals Unexpectedly Diverse Microbial Metabolism in a Biogeochemical Hot Spot in an Alluvial Aquifer
    journal, January 2017

    • Jewell, Talia N. M.; Karaoz, Ulas; Bill, Markus
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    • DOI: 10.3389/fmicb.2017.00040

    Heterogeneity in Hyporheic Flow, Pore Water Chemistry, and Microbial Community Composition in an Alpine Streambed
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    • Nelson, Amelia R.; Sawyer, Audrey H.; Gabor, Rachel S.
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    Heterogeneity in Hyporheic Flow, Pore Water Chemistry, and Microbial Community Composition in an Alpine Streambed
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    • Nelson, Amelia R.; Sawyer, Audrey H.; Gabor, Rachel S.
    • Journal of Geophysical Research: Biogeosciences, Vol. 124, Issue 11
    • DOI: 10.1029/2019jg005226

    Metatranscriptomic Analysis Reveals Unexpectedly Diverse Microbial Metabolism in a Biogeochemical Hot Spot in an Alluvial Aquifer
    journal, January 2017

    • Jewell, Talia N. M.; Karaoz, Ulas; Bill, Markus
    • Frontiers in Microbiology, Vol. 8, Article No. 40
    • DOI: 10.3389/fmicb.2017.00040