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Title: Microbial communities across a hillslope‐riparian transect shaped by proximity to the stream, groundwater table, and weathered bedrock

Abstract

Watersheds are important suppliers of freshwater for human societies. Within mountainous watersheds, microbial communities impact water chemistry and element fluxes as water from precipitation events discharge through soils and underlying weathered rock, yet there is limited information regarding the structure and function of these communities. Within the East River, CO watershed, we conducted a depth-resolved, hillslope to riparian zone transect study to identify factors that control how microorganisms are distributed and their functions. Metagenomic and geochemical analyses indicate that distance from the East River and proximity to groundwater and underlying weathered shale strongly impact microbial community structure and metabolic potential. Riparian zone microbial communities are compositionally distinct, from the phylum down to the species level, from all hillslope communities. Bacteria from phyla lacking isolated representatives consistently increase in abundance with increasing depth, but only in the riparian zone saturated sediments we found Candidate Phyla Radiation bacteria. Riparian zone microbial communities are functionally differentiated from hillslope communities based on their capacities for carbon and nitrogen fixation and sulfate reduction. Selenium reduction is prominent at depth in weathered shale and saturated riparian zone sediments and could impact water quality. We anticipate that the drivers of community composition and metabolic potential identified throughoutmore » the studied transect will predict patterns across the larger watershed hillslope system.« less

Authors:
 [1];  [2];  [2];  [3];  [3];  [3];  [2];  [3];  [3]; ORCiD logo [2]
  1. Univ. of California, Berkeley, CA (United States). Earth and Planetary Science; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Sciences
  2. Univ. of California, Berkeley, CA (United States). Earth and Planetary Science
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Sciences
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1560176
Alternate Identifier(s):
OSTI ID: 1526078; OSTI ID: 1559809
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Ecology and Evolution
Additional Journal Information:
Journal Volume: 9; Journal Issue: 12; Journal ID: ISSN 2045-7758
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 59 BASIC BIOLOGICAL SCIENCES; metabolism, metagenomics, microbiology, riparian, soil, watershed

Citation Formats

Lavy, Adi, McGrath, David Geller, Matheus Carnevali, Paula B., Wan, Jiamin, Dong, Wenming, Tokunaga, Tetsu K., Thomas, Brian C., Williams, Kenneth H., Hubbard, Susan S., and Banfield, Jillian F. Microbial communities across a hillslope‐riparian transect shaped by proximity to the stream, groundwater table, and weathered bedrock. United States: N. p., 2019. Web. doi:10.1002/ece3.5254.
Lavy, Adi, McGrath, David Geller, Matheus Carnevali, Paula B., Wan, Jiamin, Dong, Wenming, Tokunaga, Tetsu K., Thomas, Brian C., Williams, Kenneth H., Hubbard, Susan S., & Banfield, Jillian F. Microbial communities across a hillslope‐riparian transect shaped by proximity to the stream, groundwater table, and weathered bedrock. United States. doi:10.1002/ece3.5254.
Lavy, Adi, McGrath, David Geller, Matheus Carnevali, Paula B., Wan, Jiamin, Dong, Wenming, Tokunaga, Tetsu K., Thomas, Brian C., Williams, Kenneth H., Hubbard, Susan S., and Banfield, Jillian F. Wed . "Microbial communities across a hillslope‐riparian transect shaped by proximity to the stream, groundwater table, and weathered bedrock". United States. doi:10.1002/ece3.5254.
@article{osti_1560176,
title = {Microbial communities across a hillslope‐riparian transect shaped by proximity to the stream, groundwater table, and weathered bedrock},
author = {Lavy, Adi and McGrath, David Geller and Matheus Carnevali, Paula B. and Wan, Jiamin and Dong, Wenming and Tokunaga, Tetsu K. and Thomas, Brian C. and Williams, Kenneth H. and Hubbard, Susan S. and Banfield, Jillian F.},
abstractNote = {Watersheds are important suppliers of freshwater for human societies. Within mountainous watersheds, microbial communities impact water chemistry and element fluxes as water from precipitation events discharge through soils and underlying weathered rock, yet there is limited information regarding the structure and function of these communities. Within the East River, CO watershed, we conducted a depth-resolved, hillslope to riparian zone transect study to identify factors that control how microorganisms are distributed and their functions. Metagenomic and geochemical analyses indicate that distance from the East River and proximity to groundwater and underlying weathered shale strongly impact microbial community structure and metabolic potential. Riparian zone microbial communities are compositionally distinct, from the phylum down to the species level, from all hillslope communities. Bacteria from phyla lacking isolated representatives consistently increase in abundance with increasing depth, but only in the riparian zone saturated sediments we found Candidate Phyla Radiation bacteria. Riparian zone microbial communities are functionally differentiated from hillslope communities based on their capacities for carbon and nitrogen fixation and sulfate reduction. Selenium reduction is prominent at depth in weathered shale and saturated riparian zone sediments and could impact water quality. We anticipate that the drivers of community composition and metabolic potential identified throughout the studied transect will predict patterns across the larger watershed hillslope system.},
doi = {10.1002/ece3.5254},
journal = {Ecology and Evolution},
number = 12,
volume = 9,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1002/ece3.5254

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