Tamara E. C. Kraus
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View article: Designs for Cyanobacterial Harmful Algal Bloom Monitoring in the Sacramento-San Joaquin Delta, California
Designs for Cyanobacterial Harmful Algal Bloom Monitoring in the Sacramento-San Joaquin Delta, California Open
View article: Identifying conditions associated with outliers produced by three different chlorophyll fluorometers: A comparison of instrumentation and development of correction formulae
Identifying conditions associated with outliers produced by three different chlorophyll fluorometers: A comparison of instrumentation and development of correction formulae Open
Measurements of chlorophyll concentration reported by fluorometers (fChl) are used in environmental research and monitoring, as inputs to models, and in the interpretation of remote sensing data. Researchers and managers benefit from under…
View article: Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the California Sacramento–San Joaquin Delta at the landscape scale—Comparison of four (2018, 2020, 2021, 2022) spring high-resolution mapping surveys
Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the California Sacramento–San Joaquin Delta at the landscape scale—Comparison of four (2018, 2020, 2021, 2022) spring high-resolution mapping surveys Open
View article: Estimating Biogeochemical Rates Using a Computationally Efficient Lagrangian Approach
Estimating Biogeochemical Rates Using a Computationally Efficient Lagrangian Approach Open
Nutrient concentrations in many estuaries have increased over the past century due to increases in wastewater discharge and increased agricultural intensity, contributing to multiple environmental problems. Numerous biogeochemical and phys…
View article: Land-use interactions, Oil-Field infrastructure, and natural processes control hydrocarbon and arsenic concentrations in groundwater, Poso Creek Oil Field, California, USA
Land-use interactions, Oil-Field infrastructure, and natural processes control hydrocarbon and arsenic concentrations in groundwater, Poso Creek Oil Field, California, USA Open
Like many hydrocarbon production areas in the U.S., the Poso Creek Oil Field in California includes and is adjacent to other land uses (agricultural and other developed lands) that affect the hydrology and geochemistry of the aquifer overl…
View article: Evidence that ericoid mycorrhizal shrubs can outcompete ectomycorrhizal trees for nitrogen in tannin‐rich litter
Evidence that ericoid mycorrhizal shrubs can outcompete ectomycorrhizal trees for nitrogen in tannin‐rich litter Open
Mycorrhizal associations of trees play a key role in ecosystem biogeochemistry, yet we know relatively little about the nutrient acquisition strategies of ericoid mycorrhizal (ErM) shrubs, despite their prevalence in forest understories. E…
View article: Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the California Sacramento–San Joaquin Delta at the landscape scale—2018 high resolution mapping surveys
Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the California Sacramento–San Joaquin Delta at the landscape scale—2018 high resolution mapping surveys Open
First posted April 1, 2024 For additional information, contact: Director,California Water Science CenterU.S. Geological Survey6000 J Street, Placer HallSacramento, California 95819 This study examined the abundance and distribution of nutr…
View article: Dataset: Evidence that ericoid mycorrhizal shrubs can outcompete ectomycorrhizal tree seedlings for nitrogen in tannin-rich litter
Dataset: Evidence that ericoid mycorrhizal shrubs can outcompete ectomycorrhizal tree seedlings for nitrogen in tannin-rich litter Open
The full methods and context of this dataset can be found in the publication of the same name (2024) authored by Rains, Bledsoe, Kraus, and Wurzburger. Please contact Kai Rains ([email protected]) if you would like to collaborate on a project…
View article: Physics to fish—Understanding the factors that create and sustain native fish habitat in the San Francisco Estuary
Physics to fish—Understanding the factors that create and sustain native fish habitat in the San Francisco Estuary Open
First posted January 16, 2024 For additional information, contact: Director,California Water Science CenterU.S. Geological Survey6000 J Street, Placer HallSacramento, California 95819 The Bureau of Reclamation (Reclamation) operates the Ce…
View article: Dataset: Evidence that ericoid mycorrhizal shrubs can outcompete ectomycorrhizal tree seedlings for nitrogen in tannin-rich litter
Dataset: Evidence that ericoid mycorrhizal shrubs can outcompete ectomycorrhizal tree seedlings for nitrogen in tannin-rich litter Open
The full methods and context of this dataset can be found in the publication of the same name (2024) authored by Rains, Bledsoe, Kraus, and Wurzburger. Please contact Kai Rains ([email protected]) if you would like to collaborate on a project…
View article: Etiology of a Fish Kill, Including the Endangered Tidewater Goby (Eucyclogobius newberryi), in a Northeastern Pacific Coastal Lagoon
Etiology of a Fish Kill, Including the Endangered Tidewater Goby (Eucyclogobius newberryi), in a Northeastern Pacific Coastal Lagoon Open
Ecological disturbances such as fish kills can negatively impact ecosystem processes in coastal lagoons. To gain an understanding of factors causing fish kills, we examined conditions associated with a summertime fish kill in a northeaster…
View article: A novel boat‐based field application of a high‐frequency conductometric ammonium analyzer to characterize spatial variation in aquatic ecosystems
A novel boat‐based field application of a high‐frequency conductometric ammonium analyzer to characterize spatial variation in aquatic ecosystems Open
Documenting dissolved inorganic nitrogen (DIN) concentrations and forms at appropriate temporal and spatial scales is key to understanding aquatic ecosystem health, particularly because DIN fuels primary productivity. In addition to point …
View article: Spectral characterization of dissolved organic matter in groundwater to assess mixing with oil-field water near selected oil fields, southern California
Spectral characterization of dissolved organic matter in groundwater to assess mixing with oil-field water near selected oil fields, southern California Open
Samples of oil-field water (oil wells, injectate, disposal ponds) and groundwater near selected oil and gas fields in southern California were analyzed for dissolved organic carbon (DOC) concentration and by optical spectroscopic technique…
View article: Nutrient and Trace Element Contributions from Drained Islands in the Sacramento–San Joaquin Delta, California
Nutrient and Trace Element Contributions from Drained Islands in the Sacramento–San Joaquin Delta, California Open
Inventorying nutrient and trace element sources in the Sacramento-San Joaquin Delta (the Delta) is critical to understanding how changes—including alterations to point source inputs such as upgrades to the Sacramento Regional Wastewater Tr…
View article: Sources and characteristics of dissolved organic carbon in the McKenzie River, Oregon, related to the formation of disinfection by-products in treated drinking water
Sources and characteristics of dissolved organic carbon in the McKenzie River, Oregon, related to the formation of disinfection by-products in treated drinking water Open
First posted October 14, 2022 For additional information, contact: Director, Oregon Water Science CenterU.S. Geological Survey This study characterized the concentration and quality of dissolved organic carbon (DOC) in the McKenzie River, …
View article: Lateral Carbon Exports From Drained Peatlands: An Understudied Carbon Pathway in the Sacramento‐San Joaquin Delta, California
Lateral Carbon Exports From Drained Peatlands: An Understudied Carbon Pathway in the Sacramento‐San Joaquin Delta, California Open
Degradation of peatlands via drainage is increasing globally and destabilizing peat carbon (C) stores. The effects of drainage on the timing and magnitude of lateral C losses from degraded peatlands remains understudied. We measured spatia…
View article: Chemically Enhanced Treatment Wetland to Improve Water Quality and Mitigate Land Subsidence in the Sacramento‒San Joaquin Delta: Cost and Design Considerations
Chemically Enhanced Treatment Wetland to Improve Water Quality and Mitigate Land Subsidence in the Sacramento‒San Joaquin Delta: Cost and Design Considerations Open
Water quality impairment and land surface subsidence threaten the viability of the Sacramento–San Joaquin Delta (Delta), a critical component of California’s water conveyance system. Current-day irrigation drainage through Delta island pea…
View article: Spatial variability of phytoplankton in a shallow tidal freshwater system reveals complex controls on abundance and community structure
Spatial variability of phytoplankton in a shallow tidal freshwater system reveals complex controls on abundance and community structure Open
Estuaries worldwide are undergoing changes to patterns of aquatic productivity because of human activities that alter flow, impact sediment delivery and thus the light field, and contribute nutrients and contaminants like pesticides and me…
View article: Sequestration and Transformation in Chemically Enhanced Treatment Wetlands: DOC, DBPPs, and Nutrients
Sequestration and Transformation in Chemically Enhanced Treatment Wetlands: DOC, DBPPs, and Nutrients Open
This paper examines the effectiveness of chemically enhanced treatment wetlands (CETWs), wetlands that received water treated with coagulants, to remove dissolved organic carbon (DOC), disinfection byproduct precursors (DBPPs), nutrients, …
View article: Aluminum- and iron-based coagulation for in-situ removal of dissolved organic carbon, disinfection byproducts, mercury and other constituents from agricultural drain water
Aluminum- and iron-based coagulation for in-situ removal of dissolved organic carbon, disinfection byproducts, mercury and other constituents from agricultural drain water Open
Agricultural production on wetland soils can be significant sources of dissolved organic carbon (DOC), disinfection byproduct precursors, mercury and nutrients to downstream water bodies and accelerate land subsidence. Presented as a poten…
View article: Mercury sequestration and transformation in chemically enhanced treatment wetlands
Mercury sequestration and transformation in chemically enhanced treatment wetlands Open
View article: Use of flow cytometry and stable isotope analysis to determine phytoplankton uptake of wastewater derived ammonium in a nutrient-rich river
Use of flow cytometry and stable isotope analysis to determine phytoplankton uptake of wastewater derived ammonium in a nutrient-rich river Open
Anthropogenic alteration of the form and concentration of nitrogen (N) in aquatic ecosystems is widespread. Understanding availability and uptake of different N sources at the base of aquatic food webs is critical to establishment of effec…
View article: Procedures for using the Horiba Scientific Aqualog<sup>®</sup> fluorometer to measure absorbance and fluorescence from dissolved organic matter
Procedures for using the Horiba Scientific Aqualog<sup>®</sup> fluorometer to measure absorbance and fluorescence from dissolved organic matter Open
First posted July 5, 2018 For additional information, contact: Director,California Water Science CenterU.S. Geological Survey6000 J Street, Placer HallSacramento, California 95819 Advances in spectroscopic techniques have led to an increas…
View article: Wetlands receiving water treated with coagulants improve water quality by removing dissolved organic carbon and disinfection byproduct precursors
Wetlands receiving water treated with coagulants improve water quality by removing dissolved organic carbon and disinfection byproduct precursors Open
Constructed wetlands are used worldwide to improve water quality while also providing critical wetland habitat. However, wetlands have the potential to negatively impact drinking water quality by exporting dissolved organic carbon (DOC) th…
View article: Sediment accretion and carbon storage in constructed wetlands receiving water treated with metal-based coagulants
Sediment accretion and carbon storage in constructed wetlands receiving water treated with metal-based coagulants Open
In many regions of the world, subsidence of organic rich soils threatens levee stability and freshwater supply, and continued oxidative loss of organic matter contributes to greenhouse gas production. To counter subsidence in the Sacrament…
View article: Using Paired In Situ High Frequency Nitrate Measurements to Better Understand Controls on Nitrate Concentrations and Estimate Nitrification Rates in a Wastewater‐Impacted River
Using Paired In Situ High Frequency Nitrate Measurements to Better Understand Controls on Nitrate Concentrations and Estimate Nitrification Rates in a Wastewater‐Impacted River Open
We used paired continuous nitrate ( ) measurements along a tidally affected river receiving wastewater discharge rich in ammonium ( ) to quantify rates of change in concentration ( ) and estimate nitrification rates. sensors were deployed …
View article: Use of flow cytometry and stable isotope analysis to determinephytoplankton uptake of wastewater derived ammonium in anutrient-rich river
Use of flow cytometry and stable isotope analysis to determinephytoplankton uptake of wastewater derived ammonium in anutrient-rich river Open
Anthropogenic alteration of the form and concentration of nitrogen (N) in aquatic ecosystems is widespread. Understanding availability and uptake of different N sources at the base of aquatic food webs is critical to establishment of effec…
View article: A river‐scale Lagrangian experiment examining controls on phytoplankton dynamics in the presence and absence of treated wastewater effluent high in ammonium
A river‐scale Lagrangian experiment examining controls on phytoplankton dynamics in the presence and absence of treated wastewater effluent high in ammonium Open
Phytoplankton are critical component of the food web in most large rivers and estuaries, and thus identifying dominant controls on phytoplankton abundance and species composition is important to scientists, managers, and policymakers. Rece…
View article: Designing a high-frequency nutrient and biogeochemical monitoring network for the Sacramento–San Joaquin Delta, northern California
Designing a high-frequency nutrient and biogeochemical monitoring network for the Sacramento–San Joaquin Delta, northern California Open
First posted July 11, 2017 For additional information, contact: Director, California Water Science Center U.S. Geological Survey California State University Placer Hall 6000 J Street Sacramento, California 95819-6129 This report is the thi…
View article: Synthesis of data from high-frequency nutrient and associated biogeochemical monitoring for the Sacramento–San Joaquin Delta, northern California
Synthesis of data from high-frequency nutrient and associated biogeochemical monitoring for the Sacramento–San Joaquin Delta, northern California Open
First posted July 11, 2017 For additional information, contact: Director, California Water Science Center U.S. Geological Survey California State University Placer Hall 6000 J Street Sacramento, California 95819-6129 This report is the sec…