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Benthic diatom assemblages are known to be indicative of water quality but have yet to be widely adopted in biological assessments in the United States due to several limitations. To overcome some of these limitations, we aggregated bioassessment data from two national-scale Fede...

Watershed modeling in 20 large, United States (U.S.) watersheds addresses gaps in our knowledge of streamflow, nutrient (nitrogen and phosphorus), and sediment loading sensitivity to mid-21st Century climate change and urban/residential development scenarios. Use of a consistent ...

We examine how the frequency of cyanobacterial&nbsp;harmful algal blooms&nbsp;(cyanoHABs) generates economic costs through the mechanism of residential property values. We assemble nearly two decades worth of nationwide data on property sales near US inland lakes along as well as...

Previous studies indicate that cyanobacterial harmful algal bloom (cyanoHAB) frequency, extent, and magnitude have increased globally over the past few decades. However, little quantitative capability is available to assess these metrics of cyanoHABs across broad geographic scale...

Eutrophication&nbsp;and excessive algal growth pose a threat on aquatic organisms and the health of the public, environment, and the economy. Understanding what drives excessive algal growth can inform&nbsp;mitigation measures&nbsp;and aid in advance planning to minimize impacts....

Nutrient enrichment is a major issue to many inland and coastal waterbodies worldwide, including Chesapeake Bay. River water quality integrates the spatial and temporal changes of watersheds, thus monitoring forms the foundation for disentangling the effects of anthropogenic inpu...

Biological monitoring is important for assessing the ecological condition of surface waters. However, there are challenges in determining what constitutes reference conditions, what assemblages should be used as indicators, and how assemblage data should be converted into quantit...

Best Management Practices (BMPs) are used to mitigate the impacts of human activities on land and water resources. Most BMPs function via physical, chemical, and biological processes that are strongly dependent on weather and climate. Changing climatic conditions can lead to incr...

Beginning in 2015, the U.S. EPA&rsquo;s National Estuary Program (NEP) started a collaboration with partners in seven estuaries along the East Coast (Barnegat Bay; Casco Bay), West Coast (Santa Monica Bay; San Francisco Bay; Tillamook Bay), and the Gulf of Mexico (GOM) Coast (Tam...

Environmental or ecological risk assessment (ERA) is defined as the process for evaluating how likely it is that the environment may be impacted as a result of exposure to stressors. Although this definition implies the calculation of probabilities, risk assessments traditionally...

Lake Erie is threatened by eutrophication and harmful algal blooms due to excess nutrient loading from agricultural sources. Agricultural conservation practices (ACPs) have been developed and implemented to reduce nutrient losses but estimating ACP effectiveness is challenging. T...

Assessing the effectiveness of actions designed to improve water quality requires adequate monitoring of aquatic ecosystems paired with information about landscape and climate drivers. To understand spatial and temporal trends in stream total nitrogen (TN) concentrations across t...

Forests in western North America are following a trajectory toward larger, more severe, and more frequent wildfires. These changes in wildfire disturbance regimes are responses to climate trends and changes in fire suppression policies. In response, forests and associated faunal ...

Climate variations and human modifications of the water cycle continue to alter the Earth's surface water and energy exchanges. It is therefore critical to ascertain how these changes impact water quality and aquatic ecosystem habitat metrics such as river temperatures. Though ri...

Stream water temperature imposes metabolic constraints on the health of cold-water fish like salmonids. Timber harvesting can reduce stream shading leading to higher water temperatures, while also altering stream hydrology. In the Pacific Northwest, riparian buffer requirements a...

Agricultural best management practices (BMPs) reduce non-point source pollution from cropland. Goals for BMP adoption and expected pollutant load reductions are often specified in water quality management plans to protect and restore waterbodies; however, estimates of needed load...

Water quality measures for inland and coastal waters are available as discrete samples from professional and volunteer water quality monitoring programs and higher-frequency, near-continuous data from automated in situ sensors. Water quality parameters also are estimated from mod...

Cyanobacterial blooms can have negative effects on human health and local ecosystems. Field monitoring of cyanobacterial blooms can be costly, but&nbsp;satellite remote sensing&nbsp;has shown utility for more efficient spatial and temporal monitoring across the United States. Her...

This study demonstrates the value of a coupled chemical transport modeling system for investigating groundwater nitrate contamination responses associated with nitrogen (N) fertilizer application and increased corn production. The coupled Community Multiscale Air Quality Bidirect...

Warming-induced changes in lake thermal and mixing regimes present risks to water quality and ecosystem services provided by U.S. lakes and reservoirs. Modulation of responses by different physical and hydroclimatic settings are not well understood. We explore the potential effec...

Spectrally resolved water-leaving radiances (ocean colour) and inferred chlorophyll concentration are key to studying phytoplankton dynamics at seasonal and inter-annual scales, for a better understanding of the role of phytoplankton in marine biogeochemistry; the global carbon c...

Cyanobacterial blooms are expected to intensify and become more widespread with climate change and sustained nutrient pollution, subsequently increasing threats to lentic ecosystems, water quality, and human health. However, little is known about their rates of change because lon...

Anticipated future hydroclimatic changes are expected to alter the transport and survival of fecally sourced waterborne pathogens, presenting an increased risk of recreational water quality impairments. Managing future risk requires an understanding of the interactions between fe...

Uncertainty in the impacts of climate change and development on freshwater resources pose significant challenges for management of freshwater resources. Integrated and adaptive approaches to water management are a promising means of addressing uncertainty that afford flexibility ...

The Valdivia River estuary (VRE) located in south-central Chile is known as one of the largest estuarine ecosystems on the Pacific coast. This research aims to determine the intra-tidal and sub-tidal variability of saline intrusions into the VRE between November 2017 and March 20...