M. Todd Walter
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View article: Groundwater phosphorus contributions comparable to tributaries in a large, mesotrophic, polymictic lake
Groundwater phosphorus contributions comparable to tributaries in a large, mesotrophic, polymictic lake Open
Groundwater is increasingly recognized as a significant yet underappreciated source of nutrients and pollutants to lakes. This study examines the role of groundwater seepage in nutrient dynamics during the summer season in Oneida Lake, a 2…
View article: Towards a Crowdsourced Digital Coffee Atlas for Sustainable Coffee Farming
Towards a Crowdsourced Digital Coffee Atlas for Sustainable Coffee Farming Open
The present work summarizes the results of a 15-week student project addressing the field of sustainable coffee farming. Coffee farmers often lack scientific knowledge concerning the coffee varieties they cultivate, and having grown coffee…
View article: Methods for monitoring urban street litter: a comparison of municipal audits and an app-based citizen science approach
Methods for monitoring urban street litter: a comparison of municipal audits and an app-based citizen science approach Open
Non-traditional methods, including citizen (or participatory) science and professional litter audits can provide high quality data for understanding street litter and associated plastic pollution.
View article: More movement with manure: increased mobility of erythromycin through agricultural soil in the presence of manure
More movement with manure: increased mobility of erythromycin through agricultural soil in the presence of manure Open
Antibiotic residues in the environment threaten soil and aquatic organisms and human and livestock health through the building of antimicrobial resistance. Manure spreading associated with animal agriculture is one source of environmental …
View article: Abundance of microbial community genes encoding terminal proteins of the aerobic and denitrification respiratory chains as indicators of ecohydrologic gradients in a coastal temperate rainforest
Abundance of microbial community genes encoding terminal proteins of the aerobic and denitrification respiratory chains as indicators of ecohydrologic gradients in a coastal temperate rainforest Open
The persistence of soil organic carbon (SOC) is closely linked to the capacity of the soil microbial community to catalyze oxidative degradation of organic matter. This study uses a landscape-scale metagenomics approach to examine the rela…
View article: <scp>Oxic–anoxic</scp> cycling promotes coupling between complex carbon metabolism and denitrification in woodchip bioreactors
<span>Oxic–anoxic</span> cycling promotes coupling between complex carbon metabolism and denitrification in woodchip bioreactors Open
Denitrifying woodchip bioreactors (WBRs) are increasingly used to manage the release of non‐point source nitrogen (N) by stimulating microbial denitrification. Woodchips serve as a renewable organic carbon (C) source, yet the recalcitrance…
View article: An investigation of the effects of humic acid on soil erosion and loss of phosphorus from soil to runoff: Experiment and modeling
An investigation of the effects of humic acid on soil erosion and loss of phosphorus from soil to runoff: Experiment and modeling Open
Phosphorus (P) transport from soil to runoff is affected by the chemical adsorption of P by organic matter, or clay minerals. However, little information is available on the relative effects of different clay minerals on P adsorption in th…
View article: Polyphosphate Accumulation Tracks Incremental P-Enrichment in a Temperate Watershed (Pennsylvania, United States) as an Indicator of Stream Ecosystem Legacy P
Polyphosphate Accumulation Tracks Incremental P-Enrichment in a Temperate Watershed (Pennsylvania, United States) as an Indicator of Stream Ecosystem Legacy P Open
Legacy phosphorus concentrations resulting from historic additions of phosphorus (P) to the landscape may impede rapid remediation of P pollution and achievement of water quality management goals. Herein, we hypothesized that the capacity …
View article: Reducing adverse impacts of Amazon hydropower expansion
Reducing adverse impacts of Amazon hydropower expansion Open
Proposed hydropower dams at more than 350 sites throughout the Amazon require strategic evaluation of trade-offs between the numerous ecosystem services provided by Earth’s largest and most biodiverse river basin. These services are spatia…
View article: Roadside ditch macroplastic and other litter dataset in the Finger lakes region across land uses and COVID-19 pandemic
Roadside ditch macroplastic and other litter dataset in the Finger lakes region across land uses and COVID-19 pandemic Open
Litter was collected from 12 roadside ditches in the Finger lakes Region of New York State over two sampling periods: pre-COVID-19 pandemic and during COVID-19 pandemic. Litter pieces were washed in DI water, oven dried, massed and plastic…
View article: Macroplastic accumulation in roadside ditches of New York State's Finger Lakes region (USA) across land uses and the COVID-19 pandemic
Macroplastic accumulation in roadside ditches of New York State's Finger Lakes region (USA) across land uses and the COVID-19 pandemic Open
Macroplastics are a ubiquitous and growing environmental contaminant with impacts in both marine and terrestrial systems. Marine sampling has dominated research in this field, despite the terrestrial origins of most plastic debris. Due to …
View article: Farmer perceptions of dairy farm antibiotic use and transport pathways as determinants of contaminant loads to the environment
Farmer perceptions of dairy farm antibiotic use and transport pathways as determinants of contaminant loads to the environment Open
Agricultural antibiotic contamination into milk and beef products has been considered extensively, but antibiotic transport into soil and water environments is less regulated and studied. Farmer perceptions of these transport processes are…
View article: Impacts of Coal Resource Development on Surface Water Quality in a Multi‐jurisdictional Watershed in the Western United States
Impacts of Coal Resource Development on Surface Water Quality in a Multi‐jurisdictional Watershed in the Western United States Open
This study focuses on water quality and quantity impacts from natural resource development on watersheds originating on Crow tribal lands in southeastern Montana. Field research analysis will focus on the surface water quality in three adj…
Groundwater Under Open Access: A Structural Model of the Dynamic Common Pool Extraction Game Open
Resource/Energy Economics and Policy, Research Methods/Statistical Methods
View article: Characteristics of impervious surface and its effect on direct runoff: a case study in a rapidly urbanized area
Characteristics of impervious surface and its effect on direct runoff: a case study in a rapidly urbanized area Open
In recent years, many cities have experienced serious urban flood and non-point pollution issues due to hydrological process changes in rapidly urbanizing areas. Understanding the relationship between impervious surface and direct runoff i…
View article: Seasonal dynamics and exports of elements from a first‐order stream to a large inland lake in Michigan
Seasonal dynamics and exports of elements from a first‐order stream to a large inland lake in Michigan Open
Headwater streams are critical components of drainage systems, directly connecting terrestrial and downstream aquatic ecosystems. The amount of water in a stream can alter hydrologic connectivity between the stream and surrounding landscap…
View article: Tracing Septic Pollution Sources Using Synthetic DNA Tracers: Proof of Concept
Tracing Septic Pollution Sources Using Synthetic DNA Tracers: Proof of Concept Open
Contamination from septic systems is one of the most difficult sources of nonpoint source (NPS) pollution to quantify. Quantification is difficult in part because locating malfunctioning septic systems within a watershed is challenging. Th…
View article: A Test of Two Spatial Frameworks for Representing Spatial Patterns of Wetness in a Glacial Drift Watershed
A Test of Two Spatial Frameworks for Representing Spatial Patterns of Wetness in a Glacial Drift Watershed Open
Core Ideas Soil moisture and water table position vary across ecosystems and parent materials. Ecosystem classifications and topographic wetness indices represent moisture status. Topographic wetness indices perform best in till rather tha…
View article: Absence of genetic selection in a pathogenic Escherichia coli strain exposed to the manure-amended soil environment
Absence of genetic selection in a pathogenic Escherichia coli strain exposed to the manure-amended soil environment Open
Escherichia coli that express curli are more common in subsurface soil drainage when manure is surface applied. However, it is unknown whether this arises from mutations in individual strains leading to curli expression or by selection for…
View article: Student engagement with course content and peers in synchronous online courses discussions
Student engagement with course content and peers in synchronous online courses discussions Open
As higher education institutions in United States offer online courses to growing audiences, there is increasing desire to understand how best to engage students with both course content and their peers. This case study examines the effect…
View article: Challenges to implementing bottom-up flood risk decision analysis frameworks: how strong are social networks of flooding professionals?
Challenges to implementing bottom-up flood risk decision analysis frameworks: how strong are social networks of flooding professionals? Open
Recent developments in bottom-up vulnerability-based decision analysis frameworks present promising opportunities for flood practitioners to simplify complex decisions regarding risk mitigation and climate adaptation. This family of method…
View article: Nitrogen Biogeochemistry of an Urban Rooftop Farm
Nitrogen Biogeochemistry of an Urban Rooftop Farm Open
Intensive agriculture represents a recent extension of green roof technology. Perceived ecosystem services provided by rooftop farming include stormwater management and the production of affordable and nutritious vegetables for local consu…
Temperature dependence of daily respiration and reaeration rates during baseflow conditions in a northeastern U.S. stream Open
Study region: Finger Lakes Region, New York, USA. Study focus: The relationship between stream temperature and daily respiration and reaeration rates was investigated from May 2015 – May 2016 for two sites, one in the headwaters and the ot…
View article: Challenges and Opportunities With On-Farm Research: Total and Soluble Reactive Stream Phosphorus Before and After Implementation of a Cattle-Exclusion, Riparian Buffer
Challenges and Opportunities With On-Farm Research: Total and Soluble Reactive Stream Phosphorus Before and After Implementation of a Cattle-Exclusion, Riparian Buffer Open
Many nutrient mitigation best management practices (BMP) are promoted by state and federal agencies to protect water quality from animal agriculture. The measured effectiveness of these is highly variable in the research literature. Here, …