Ryan A. Hill
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View article: A model‐based assessment of anthropogenic disturbance on lotic macroinvertebrate assemblages
A model‐based assessment of anthropogenic disturbance on lotic macroinvertebrate assemblages Open
Traditionally, the effects of anthropogenic disturbance on biological assemblages are elucidated by comparing an assemblage observed at a site to one that represents a minimally disturbed state. Unfortunately, defining a minimally disturbe…
View article: Mustard Seed Meal and Mulches for Weed Control in Greenhouses1
Mustard Seed Meal and Mulches for Weed Control in Greenhouses1 Open
Weed management in greenhouse ornamental production is essential for maintaining crop health and quality. This study explores mustard seed meal (MSM) in combination with natural mulches (hazelnut shell mulch [HM] and liquid mulch [LM]) as …
View article: Quantifying form resistance is essential for estimating summer low and bankfull flow from stream survey channel morphology
Quantifying form resistance is essential for estimating summer low and bankfull flow from stream survey channel morphology Open
Reliable estimates of low flow and flood discharge at ungaged locations are required for evaluating stream flow alteration, designing culverts and stream crossings, and interpreting regional surveys of habitat and biotic condition. Very fe…
View article: finsyncR, an R package to synchronize 27 years of fish and invertebrate data across the United States
finsyncR, an R package to synchronize 27 years of fish and invertebrate data across the United States Open
The United States government collects some of the most comprehensive data on freshwater systems in existence, but barriers exist for new users to apply these data without institutional guidance. ‘finsyncR’ ( f ish and in vertebrate sync hr…
View article: Improving ecosystem health in highly altered river basins: a generalized framework and its application to the Mississippi-Atchafalaya River Basin
Improving ecosystem health in highly altered river basins: a generalized framework and its application to the Mississippi-Atchafalaya River Basin Open
Continued large-scale public investment in declining ecosystems depends on demonstrations of “success”. While the public conception of “success” often focuses on restoration to a pre-disturbance condition, the scientific community is more …
View article: The changing nitrogen landscape of United States streams: Declining deposition and increasing organic nitrogen
The changing nitrogen landscape of United States streams: Declining deposition and increasing organic nitrogen Open
Air quality regulations have led to decreased nitrogen (N) and sulfur deposition across the conterminous United States (CONUS) during the last several decades, particularly in the eastern parts. But it is unclear if declining deposition ha…
View article: Disentangling natural and anthropogenic effects on benthic macroinvertebrate assemblages in western <scp>US</scp> streams
Disentangling natural and anthropogenic effects on benthic macroinvertebrate assemblages in western <span>US</span> streams Open
Stream macroinvertebrate assemblages are shaped by natural and human‐related factors that operate through complex hierarchical pathways. Quantifying these relationships can provide additional insights into stream ecological assessment. We …
View article: Comparing Drivers of Spatial Variability in U.S. Lake and Stream Phosphorus Concentrations
Comparing Drivers of Spatial Variability in U.S. Lake and Stream Phosphorus Concentrations Open
Decision makers need to know the drivers of surface water phosphorus (P) concentrations, the environmental factors that mediate P loading in freshwater systems, and where pollution sources and mediating factors are co‐located to inform wat…
View article: Joint species distribution models reveal taxon-specific sensitivities to potential anthropogenic alteration
Joint species distribution models reveal taxon-specific sensitivities to potential anthropogenic alteration Open
Taxon-environment relationships can elucidate a taxon's tolerance or sensitivity to specific environmental conditions. We use a joint species distribution modeling framework to quantify relationships between ~1700 benthic macroinvertebrate…
View article: Density declines, richness increases, and composition shifts in stream macroinvertebrates
Density declines, richness increases, and composition shifts in stream macroinvertebrates Open
Documenting trends of stream macroinvertebrate biodiversity is challenging because biomonitoring often has limited spatial, temporal, and taxonomic scopes. We analyzed biodiversity and composition of assemblages of >500 genera, spanning 27…
View article: Estimating biotic integrity to capture existence value of freshwater ecosystems
Estimating biotic integrity to capture existence value of freshwater ecosystems Open
The US Environmental Protection Agency (EPA) uses a water quality index (WQI) to estimate benefits of proposed Clean Water Act regulations. The WQI is relevant to human use value, such as recreation, but may not fully capture aspects of no…
View article: National hydrologic connectivity classification links wetlands with stream water quality
National hydrologic connectivity classification links wetlands with stream water quality Open
Wetland hydrologic connections to downstream waters influence stream water quality. However, no systematic approach for characterizing this connectivity exists. Here using physical principles, we categorized conterminous US freshwater wetl…
View article: Random forest models to estimate bankfull and low flow channel widths and depths across the conterminous United States
Random forest models to estimate bankfull and low flow channel widths and depths across the conterminous United States Open
Channel dimensions (width and depth) at varying flows influence a host of instream ecological processes, as well as habitat and biotic features; they are a major consideration in stream habitat restoration and instream flow assessments. Mo…
View article: A multiscale landscape approach for prioritizing river and stream protection and restoration actions
A multiscale landscape approach for prioritizing river and stream protection and restoration actions Open
River and stream conservation programs have historically focused on a single spatial scale, for example, a watershed or stream site. Recently, the use of landscape information (e.g., land use and land cover) at multiple spatial scales and …
View article: Geospatial Patterns of Antimicrobial Resistance Genes in the US EPA National Rivers and Streams Assessment Survey
Geospatial Patterns of Antimicrobial Resistance Genes in the US EPA National Rivers and Streams Assessment Survey Open
Antimicrobial resistance (AR) is a serious global problem due to the overuse of antimicrobials in human, animal, and agriculture sectors. There is intense research to control the dissemination of AR, but little is known regarding the envir…
View article: Natural and anthropogenic controls on lake water‐level decline and evaporation‐to‐inflow ratio in the conterminous United States
Natural and anthropogenic controls on lake water‐level decline and evaporation‐to‐inflow ratio in the conterminous United States Open
Lake water levels are integral to lake function, but hydrologic changes from land and water management may alter lake fluctuations beyond natural ranges. We constructed a conceptual model of multifaceted drivers of lake water levels and ev…
View article: Modeling USA stream temperatures for stream biodiversity and climate change assessments
Modeling USA stream temperatures for stream biodiversity and climate change assessments Open
Stream temperature (ST) is a primary determinant of individual stream species distributions and community composition. Moreover, thermal modifications associated with urbanization, agriculture, reservoirs, and climate change can significan…
View article: Context is Everything: Interacting Inputs and Landscape Characteristics Control Stream Nitrogen
Context is Everything: Interacting Inputs and Landscape Characteristics Control Stream Nitrogen Open
To understand the environmental and anthropogenic drivers of stream nitrogen (N) concentrations across the conterminous US, we combined summer low-flow data from 4997 streams with watershed information across three survey periods (2000-201…
View article: Wetland Flowpaths Mediate Nitrogen and Phosphorus Concentrations across the Upper Mississippi River Basin
Wetland Flowpaths Mediate Nitrogen and Phosphorus Concentrations across the Upper Mississippi River Basin Open
Eutrophication, harmful algal blooms, and human health impacts are critical environmental challenges resulting from excess nitrogen and phosphorus in surface waters. Yet we have limited information regarding how wetland characteristics med…
View article: Valuing Aquatic Ecosystem Health at a National Scale: Modeling Biological Indicators Across Space and Time
Valuing Aquatic Ecosystem Health at a National Scale: Modeling Biological Indicators Across Space and Time Open
The US Environmental Protection Agency (EPA) uses a water quality index (WQI) to estimate the benefits of proposed regulations. However, the existing WQI focuses mainly on metrics related to human use values, such as recreation, and fails …
View article: Prioritizing management goals for stream biological integrity within the developed landscape context
Prioritizing management goals for stream biological integrity within the developed landscape context Open
Stream management goals for biological integrity may be difficult to achieve in developed landscapes where channel modification and other factors constrain in-stream conditions. To evaluate potential constraints on biological integrity, we…