Science Inventory

<< Previous

Next >>

Water quality in nontidal headwater (first-order) streams of the Coastal Plain during base flow in the late winter and spring is related to land use, hydrogeology, and other natural or human influences in contributing watersheds. A random survey of 174 headwater streams of the Mi...

This presentation is an integrated evaluation of cyanobacterial growth and toxin production, from a reservoir through drinking water treatment - where biomass and toxin removal are achieved. Data is generated by a variety of methods: online instrumentation for chlorophyll, diss...

Tillamook Bay (Oregon, USA) often experiences water quality impairments due to low oxygen levels and elevated fecal bacteria counts. Potential pollutant sources in this mixed-use watershed include agricultural (extensive dairy operations in lowlands), wildlife, and human waste (m...

This technical report provides a description of the field project design, quality control, the sampling protocols and analysis methodology used, and standard operating procedures for the South Fork Broad River Watershed (SFBR) Total Maximum Daily Load (TMDL) project. This watersh...

In this paper we review the published, scientific literature addressing the response of nutrients, sediment, pathogens, and cyanobacterial blooms to historical and potential future changes in air temperature and precipitation. The goal is to document how different attributes of w...

The U. S. Geological Survey (USGS), in cooperation with the U. S. Environmental Protection Agency (US EPA), collected water samples from 120 small streams (watersheds less than 200 square kilometers) across the Midwestern United States during the summer and fall of 2004. This stu...

The Animas and San Juan Rivers were extensively monitored for metals in the water and sediments by EPA, state and tribal agencies during and through the year following the Gold King Mine release that occurred in August 2015. &nbsp;Congress funded additional water quality monitori...

The technology available for the control of sediments, nutrients, and adsorbed biocides in surface irrigation return flows has been reviewed and evaluated. Some of this technology could be applied immediately to reduce sediment and associated nutrient and biocide concentrations i...

Epiphytes on seagrass growing in the lower intertidal were examined along an estuarine gradient within Yaquina Bay, Oregon over a period of 4 years. The Yaquina Estuary receives high levels of nutrients from the watershed during the wet season and from the ocean during the dry s...

Monitoring programs often collect diatoms because the usefulness of diatoms as early indicators of water quality change is a common discussion point in the literature. Our literature review was motivated by the need for comprehensive information on stressor-response relationships...

This research aims to understand the relationship between SAV loss and nutrient loading (N and P). A set of models will be developed and used to examine how nutrients interact with the physical and biological components to affect the health of SAV populations. First, a literat...

Increased nutrient loads associated with human activities are among leading causes of impairment to streams and receiving waterbodies. For streams draining to the environmentally and economically important Narragansett Bay estuary, we developed indicators based on (1) nitrogen an...

The occurrence of selected pesticides and nutrient compounds in nontidal headwater streams of the Mid-Atlantic Coastal Plain (North Carolina through New Jersey) during winter and spring base flow is related to land use, soils, and other geographic variables that reflect sources a...

Undesirable algal blooms and hypoxia are growing hazards to water resources and society. Integrated modeling of HABs, hypoxia, and nutrient loading is a significant challenge; the path forward makes use of a new generation of models. An improved near-term forecasting capability w...

This study is part of a long-term cooperative national research project among the US EPA and the USGS to collect comparable water-quality data from small streams and to develop regional predicitive models that use landscape characteristics to estimate pesticide and nutrient conce...

Eutrophication from nitrogen and phosphorus pollution is a major stressor of freshwater ecosystems globally. Despite recognition of this problem by scientists and stakeholders, synthesis of scientific evidence is still needed to inform nutrient-related management decisions and po...

Understanding the consequences of the declining global cover of mangroves due to anthropogenic disturbance necessitates consideration of how mangrove-derived nutrients contribute to threatened coral reef systems. We sampled potential sources of organic matter and a suite of sessi...

The global increase of noxious bloom occurrences has increased the need for phytoplankton management schemes. Such schemes require the ability to predict phytoplankton succession. Equilibrium Resources Competition theory, which is popular for predicting succession in lake systems...

Many shallow lakes in the southeastern US are eutrophic, and as such, the water quality in these lakes is of concern to state and federal environmental regulatory agencies. Some of these lakes have been classified as impaired with one or more nutrients being the stressor. For the...

Nutrient enrichment is one of the most important stressors causing water-resource impairment. These impairments are causing devastating changes: 1) high nitrate concentrations have rendered the groundwaters and reservoirs in many regions impotable -- especially in the rural area...

Nutrient enrichment is one of the most detrimental stressors causing water-resource impairment. Of systems surveyed and reported as impaired, 40% of rivers, 51% of lakes, and 57% of estuaries listed nutrients as a primary cause of impairment (USEPA, 1996). In many cases, these ...

Numerous studies in artificial streams suggest the relationship between nurients and periphyton biomass (AFDM) and chlorophyll a in streams is affected by ambient light, which is influenced by canopy cover, and by grazer densities. To assess the relationships between nutrients a...

Narragansett Bay has been heavily fertilized by anthropogenic nutrients for almost 120 years. This presentation discusses the first introductions of human sources of nutrients to the Bay, via sewage and urban runoff, in the late 1890s through to the recent reductions in sewage ef...

Studies were conducted to determine the impact of ozone on the nutrient concentrations in tissue from various organs of beans (Phaseolus vulgaris L. cv Bush Bluelake 290). The plants were exposed to episodic concentrations of ozone in open-top field exposure chambers from soon af...

Water quality in nontidal headwater (first-order) streams of the Mid-Atlantic Coastal Plain (MACP) during base flow in the late winter and spring is related to land use, hydrogeology, and other natural or human influences in contributing watersheds.