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Jennifer Underwood

Jennifer Underwood is a Microbiologist for the Water Resources Mission Area in Boulder, CO.

Science and Products

Water Quality and Molecular Data for Upper Klamath Lake, OR, 2016

Upper Klamath Lake, located in southern Oregon, is a hypereutrophic lake where cyanobacterial blooms, dominated by Aphanizomenon flos-aquae (AFA), occur every summer. The decay of excess biomass after AFA senescence leads to problematic water quality conditions including high pH ( > 9) and anoxia. Water samples from the photic zone and bottom of the water column, and the flocculation layer of the
By
Water Resources Mission Area

Microbial community analyses of groundwater collected during an enhanced bioremediation experiment of trichlorethylene in a fractured rock aquifer, West Trenton, NJ (2008-2015)

These datasets contain microbial community data from groundwater samples collected at an in situ bioremediation site located at the former Naval Air Warfare Center (NAWC), West Trenton, NJ. DNA was extracted from groundwater samples collected from monitoring wells at the NAWC study site from July 2008 through July 2015 and analyzed for microbial community structure. Sample collection coincided wit
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Water Resources Mission Area

Water-Quality Data in and near Groundwater Flow-Through Kettle-Hole Lakes, Western Cape Cod, Massachusetts, 2003 - 2018

This U.S. Geological Survey (USGS) data release provides a comprehensive dataset of water-quality results, physical-parameter measurements, hydrologic measurements, and site information collected to study the nature and extent of water quality along groundwater flow paths adjacent to glacial-kettle lakes on Cape Cod, Massachusetts. Water-quality samples were collected in 2003, 2005, and 2012 thro
By
New England Water Science Center

Microbial Community and N-cycling gene abundance from Ponds and Groundwater on Cape Cod, MA (2015 - 2018)

Surface water, pore water, pond bottom sediments, and groundwater were sampled within and downgradient from five groundwater flow-through ponds that ranged from oligotrophic to eutrophic in Cape Cod, Massachusetts during different seasons from 2015 – 2018. The sampled ponds included Ashumet, Santuit, Snake, Shubael, and Longs. Pore water was collected between 15 to 100 cm below the pond bottoms on
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Water Resources Mission Area

Water quality of samples collected in the Russian River Watershed (2017-2019)

The Russian River watershed is an important resource for drinking water and recreation. Sonoma Water relies on the Russian River to provide drinking water to over 620,000 Sonoma County and Marin, CA residents. Nearly 1 million visitors enjoy numerous recreational opportunities on the Russian River annually. Wildfires have increased in frequency and intensity in Northern California and research is
By
Water Resources Mission Area
A USGS scientist prepares a sample to test the effect of antibiotics on denitrifying bacteria within a glove box
A USGS scientist prepares a sample to test the effect of antibiotics
A USGS scientist prepares a sample to test the effect of antibiotics
A USGS scientist prepares a sample to test the effect of antibiotics on denitrifying bacteria within a glove box

A USGS scientist prepares a sample to test the effect of antibiotics

A USGS scientist prepares a sample to test the effect of antibiotics

A USGS scientist prepares a sample to test the effect of antibiotics on denitrifying bacteria within a glove box. A glove box allows scientists to work with samples in an anaerobic (no oxygen) atmosphere, the conditions under which denitrification occurs.

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
A USGS scientist prepares a sample to test the effect of antibiotics on denitrifying bacteria within a glove box

A USGS scientist prepares a sample to test the effect of antibiotics

A USGS scientist prepares a sample to test the effect of antibiotics

A USGS scientist prepares a sample to test the effect of antibiotics on denitrifying bacteria within a glove box. A glove box allows scientists to work with samples in an anaerobic (no oxygen) atmosphere, the conditions under which denitrification occurs.

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program

Relation between the Relative Abundance and Collapse of Aphanizomenon flos-aquae and Microbial Antagonism in Upper Klamath Lake, Oregon

Aphanizomenon flos-aquae (AFA) is the dominant filamentous cyanobacterium that develops into blooms in Upper Klamath Lake, Oregon each year. During AFA bloom and collapse, ecosystem conditions for endangered Lost River and shortnose suckers deteriorate, thus motivating the need to identify processes that limit AFA abundance and decline. Here we investigate the relations between AFA and other membe
Authors
Jennifer C. Underwood, Natalie Celeste Hall, Adam Mumford, Ronald W. Harvey, Paul Anthony Bliznik, Kaitlyn Michelle Jeanis

Prolonged drought in a northern California coastal region suppresses wildfire impacts on hydrology

Wildfires naturally occur in many landscapes, however they are undergoing rapid regime shifts. Despite the emphasis in the literature on the most severe hydrological responses to wildfire, there remains a knowledge gap on the thresholds of wildfire (i.e. burned area/drainage area ratio, BAR) required to initiate hydrological responses. We investigated hydrological changes in the Russian River Wate
Authors
Michelle E. Newcomer, Jennifer C. Underwood, Sheila F. Murphy, Craig Ulrich, Todd Schram, Stephen R. Maples, Jasquelin Peña, Erica R. Siirila-Woodburn, Marcus Trotta, Jay Jasperse, Donald Seymour, Susan S. Hubbard

Microbial community response to a bioaugmentation test to degrade trichloroethylene in a fractured rock aquifer, Trenton, N.J

Bioaugmentation is a promising strategy for enhancing trichloroethylene (TCE) degradation in fractured rock. However, slow or incomplete biodegradation can lead to stalling at degradation byproducts such as 1,2-dichloroethene (cis-DCE) and vinyl chloride (VC). Over the course of 7 years, we examined the response of groundwater microbial populations in a bioaugmentation test where an emulsified veg
Authors
Jennifer C. Underwood, Denise M. Akob, Michelle Lorah, Thomas E. Imbrigiotta, Ronald W. Harvey, Claire R. Tiedeman
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Water Resources Mission Area, Environmental Health Program, Geology, Energy & Minerals Science Center, Maryland-Delaware-D.C. Water Science Center, New Jersey Water Science Center, Reston Microbiology Laboratory

Importance of the colmation layer in the transport and removal of cyanobacteria, viruses, and dissolved organic carbon during natural lake-bank filtration

This study focused on the importance of the colmation layer in the removal of cyanobacteria, viruses, and dissolved organic carbon (DOC) during natural bank filtration. Injection-and-recovery studies were performed at two shallow (0.5 m deep), sandy, near-shore sites at the southern end of Ashumet Pond, a waste-impacted, kettle pond on Cape Cod, MA, that is subject to periodic blooms of cyanobacte
Authors
Ronald W. Harvey, David W. Metge, Denis R. LeBlanc, Jennifer C. Underwood, George R. Aiken, Kenna D. Butler, Timothy D. McCobb, Jay Jasperse
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Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, New England Water Science Center

Nitrogen cycling processes and microbial community composition in bed sediments in the Yukon River at Pilot Station

Information on the contribution of nitrogen (N)-cycling processes in bed sediments to river nutrient fluxes in large northern latitude river systems is limited. This study examined the relationship between N-cycling processes in bed sediments and N speciation and loading in the Yukon River near its mouth at the Bering Sea. We conducted laboratory bioassays to measure N-cycling processes in sedimen
Authors
Deborah A. Repert, Jennifer C. Underwood, Richard L. Smith, Bongkeun Song
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Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Effects of the antimicrobial sulfamethoxazole on groundwater bacterial enrichment

The effects of “trace” (environmentally relevant) concentrations of the antimicrobial agent sulfamethoxazole (SMX) on the growth, nitrate reduction activity, and bacterial composition of an enrichment culture prepared with groundwater from a pristine zone of a sandy drinking-water aquifer on Cape Cod, MA, were assessed by laboratory incubations. When the enrichments were grown under heterotrophic
Authors
Jennifer C. Underwood, Ronald W. Harvey, David W. Metge, Deborah A. Repert, Laura K. Baumgartner, Richard L. Smith, Timberly M. Roane, Larry B. Barber
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

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