Patrick Moran

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  January 6, 2011

  Lake Crescent

  Lake Crescent in Olympic National Park is known for its clear, near-pristine water. Because the water is very low in plant nutrients, such as nitrogen and phosphorus, the lake is extremely susceptible to even small increases in nutrient levels, which could cause algal blooms and impact the health of three species of fish in the lake. Currently, the growth of bottom-dwelling algae in developed...

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  Washington Water Science Center

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  January 6, 2011

  Lake Crescent

  Lake Crescent in Olympic National Park is known for its clear, near-pristine water. Because the water is very low in plant nutrients, such as nitrogen and phosphorus, the lake is extremely susceptible to even small increases in nutrient levels, which could cause algal blooms and impact the health of three species of fish in the lake. Currently, the growth of bottom-dwelling algae in developed...

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  January 3, 2003

  Groundwater Pesticide

  The Environmental Protection Agency (EPA) is developing a rule requiring States to have a formal plan for the pesticides atrazine, simazine, alachlor, metolachlor, and other pesticides of concern in order to continue using them. The Washington State Department of Agriculture (WSDA), the lead agency for a pesticide plan for Washington, will need an assessment of ground-water vulnerability to...

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  Washington Water Science Center

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  January 3, 2003

  Groundwater Pesticide

  The Environmental Protection Agency (EPA) is developing a rule requiring States to have a formal plan for the pesticides atrazine, simazine, alachlor, metolachlor, and other pesticides of concern in order to continue using them. The Washington State Department of Agriculture (WSDA), the lead agency for a pesticide plan for Washington, will need an assessment of ground-water vulnerability to...

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• Publications
  Filter Total Items: 40

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  November 1, 2018

  Effect of sample holding time on bioaccessibility and sediment ecotoxicological assessments

  The ecotoxicological effects of hydrophobic organic compound (HOC) contamination in sediment are often assessed using laboratory exposures of cultured invertebrates to field-collected sediment. The use of a sediment holding time (storage at 4°C) between field sampling and the beginning of the bioassay is common practice, yet the effect of holding time on the reliability of bioassay results is larg

  Authors

  Kara S Huff Hartz, Federico L. Sinche, Samuel A. Nutile, Courtney Y. Fung, Patrick W. Moran, Peter C. Van Metre, Lisa H. Nowell, Marc A. Mills, Michael J Lydy

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  Water Resources Mission Area, Oklahoma-Texas Water Science Center, Washington Water Science Center

  August 9, 2018

  Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington

  The U.S. Geological Survey evaluated the transformation of mercury to bioavailable methylmercury in Sinclair Inlet, Kitsap County, Washington, and assessed the effect of the transformation processes on the mercury burden in marine organisms and sediment. In August 2008, samples of sediment, water, and biota from six sites in Sinclair Inlet and three bays representative of Puget Sound embayments we

  Authors

  A.J. Paulson, M.C. Marvin-DiPasquale, P.W. Moran, J.F. DeWild, A.R. Stewart, J. Toft, J.L. Agee, E. Kakouros, Le H. Kieu, B. Carter, R.W. Sheibley, J. Cordell, David P. Krabbenhoft

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  Water Resources Mission Area, Upper Midwest Water Science Center, Washington Water Science Center, Mercury Research Laboratory

  February 7, 2018

  Juvenile coho salmon growth and health in streams across an urbanization gradient

  Expanding human population and urbanization alters freshwater systems through structural changes to habitat, temperature effects from increased runoff and reduced canopy cover, altered flows, and increased toxicants. Current stream assessments stop short of measuring health or condition of species utilizing these freshwater habitats and fail to link specific stressors mechanistically to the health

  Authors

  Andrew R. Spanjer, Patrick W. Moran, Kimberly Larsen, Lisa Wetzel, Adam G. Hansen, David A. Beauchamp

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  Ecosystems Mission Area, Water Resources Mission Area, Species Management Research Program, Western Fisheries Research Center

  November 13, 2017

  Complex mixtures of dissolved pesticides show potential aquatic toxicity in a synoptic study of Midwestern U.S. streams

  Aquatic organisms in streams are exposed to pesticide mixtures that vary in composition over time in response to changes in flow conditions, pesticide inputs to the stream, and pesticide fate and degradation within the stream. To characterize mixtures of dissolved-phase pesticides and degradates in Midwestern streams, a synoptic study was conducted at 100 streams during May–August 2013. In weekly

  Authors

  Lisa H. Nowell, Patrick W. Moran, Travis S. Schmidt, Julia E. Norman, Naomi Nakagaki, Megan E. Shoda, Barbara Mahler, Peter C. Van Metre, Wesley W. Stone, Mark W. Sandstrom, Michelle L. Hladik

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  Water Resources Mission Area, California Water Science Center, Ohio-Kentucky-Indiana Water Science Center, National Water Quality Laboratory

  November 13, 2017

  Influence of sediment chemistry and sediment toxicity on macroinvertebrate communities across 99 wadable streams of the Midwestern USA

  Simultaneous assessment of sediment chemistry, sediment toxicity, and macroinvertebrate communities can provide multiple lines of evidence when investigating relations between sediment contaminants and ecological degradation. These three measures were evaluated at 99 wadable stream sites across 11 states in the Midwestern United States during the summer of 2013 to assess sediment pollution across

  Authors

  Patrick W. Moran, Lisa H. Nowell, Nile E. Kemble, Barbara Mahler, Ian R. Waite, Peter C. Van Metre

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  Water Resources Mission Area, Columbia Environmental Research Center, Washington Water Science Center

  November 1, 2017

  Suspended sediment, turbidity, and stream water temperature in the Sauk River Basin, western Washington, water years 2012-16

  The Sauk River is a federally designated Wild and Scenic River that drains a relatively undisturbed landscape along the western slope of the North Cascade Mountain Range, Washington, which includes the glaciated volcano, Glacier Peak. Naturally high sediment loads characteristic of basins draining volcanoes like Glacier Peak make the Sauk River a dominant contributor of sediment to the downstream

  Authors

  Kristin L. Jaeger, Christopher A. Curran, Scott W. Anderson, Scott T. Morris, Patrick W. Moran, Katherine A. Reams

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  Water Resources Mission Area, Washington Water Science Center

  June 1, 2017

  Complex mixtures of Pesticides in Midwest U.S. streams indicated by POCIS time-integrating samplers

  The Midwest United States is an intensely agricultural region where pesticides in streams pose risks to aquatic biota, but temporal variability in pesticide concentrations makes characterization of their exposure to organisms challenging. To compensate for the effects of temporal variability, we deployed polar organic chemical integrative samplers (POCIS) in 100 small streams across the Midwest fo

  Authors

  Peter C. Van Metre, David Alvarez, Barbara Mahler, Lisa H. Nowell, Mark W. Sandstrom, Patrick W. Moran

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  Water Resources Mission Area, National Water Quality Laboratory

  May 31, 2016

  Monitoring plant tissue nitrogen isotopes to assess nearshore inputs of nitrogen to Lake Crescent, Olympic National Park, Washington

  Mats of filamentous-periphytic algae present in some nearshore areas of Lake Crescent, Olympic National Park, Washington, may indicate early stages of eutrophication from nutrient enrichment of an otherwise highly oligotrophic lake. Natural abundance ratios of stable isotopes of nitrogen (δ15N) measured in plant tissue growing in nearshore areas of the lake indicate that the major source of nitrog

  Authors

  Stephen E. Cox, Patrick W. Moran, Raegan L. Huffman, Steven C. Fradkin

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  Water Resources Mission Area, Washington Water Science Center

  March 1, 2016

  Development and application of freshwater sediment-toxicity benchmarks for currently used pesticides

  Sediment-toxicity benchmarks are needed to interpret the biological significance of currently used pesticides detected in whole sediments. Two types of freshwater sediment benchmarks for pesticides were developed using spiked-sediment bioassay (SSB) data from the literature. These benchmarks can be used to interpret sediment-toxicity data or to assess the potential toxicity of pesticides in whole

  Authors

  Lisa H. Nowell, Julia E. Norman, Christopher G. Ingersoll, Patrick W. Moran

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  Water Resources Mission Area, Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, California Water Science Center, Columbia Environmental Research Center

  March 20, 2015

  Contaminant removal by wastewater treatment plants in the Stillaguamish River Basin, Washington

  Human activities in most areas of the developed world typically release nutrients, pharmaceuticals, personal care products, pesticides, and other contaminants into the environment, many of which reach freshwater ecosystems. In urbanized areas, wastewater treatment plants (WWTPs) are critical facilities for collecting and reducing the amounts of wastewater contaminants (WWCs) that ultimately discha

  Authors

  Jack E. Barbash, Patrick W. Moran, Richard J. Wagner, Michael Wolanek

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  Water Resources Mission Area, Washington Water Science Center

  April 1, 2014

  Pesticide Toxicity Index: a tool for assessing potential toxicity of pesticide mixtures to freshwater aquatic organisms

  Pesticide mixtures are common in streams with agricultural or urban influence in the watershed. The Pesticide Toxicity Index (PTI) is a screening tool to assess potential aquatic toxicity of complex pesticide mixtures by combining measures of pesticide exposure and acute toxicity in an additive toxic-unit model. The PTI is determined separately for fish, cladocerans, and benthic invertebrates. Thi

  Authors

  Lisa H. Nowell, Julia E. Norman, Patrick W. Moran, Jeffrey D. Martin, Wesley W. Stone

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  Water Resources Mission Area, California Water Science Center

  March 3, 2014

  Contaminants of emerging concern in the lower Stillaguamish River Basin, Washington, 2008-11

  A series of discrete water-quality samples were collected in the lower Stillaguamish River Basin near the city of Arlington, Washington, through a partnership with the Stillaguamish Tribe of Indians. These samples included surface waters of the Stillaguamish River, adjacent tributary streams, and paired inflow and outflow sampling at three wastewater treatment plants in the lower river basin. Chem

  Authors

  Richard J. Wagner, Patrick W. Moran, Steven D. Zaugg, Jennifer M. Sevigny, Judy M. Pope

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  Water Resources Mission Area, Washington Water Science Center
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