Publications

this study was designed to determine the influence of a range of salinities (5, 15 and 25 ppt) on the acute toxicity of atrazine to the copepod, Eurytemore affinis and the sheepshead minow larvae, Cyprinodon variegatus. An additional objective of the study was to provide acute atrazine toxicity data for E. affinis to fill a data requirement for development of an estuarine water quality criterion. Niney-six hour LC50 values for the copepod were 0.5, 2.62 and 13.2 mg/L at salinities showed a statistical difference between 15 and 25 ppt but not between 5 and 15 ppt.

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This pilot study was designed to evaluate ambient toxicity in the Chesapeake Bay watershed by using a battery of water column and sediemtn toxicity tests. A team of scientists from two Chesapeake Bay research laboratories worked jointly to complete this goal. Water column toxicity studies were directed by Lenwood W. Hall, Jr. of the University of Maryland System's Agricultural Experiment Staation; sediment toxicity tests were managed by Raymond W. Alden, III of Old Dominion University Applied Marine Reserach Laboratory. This report summarizes data from the third year of a three-year pilot study.

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This pilot study was designed to evaluate ambient toxicity i the ChesapeakeBay Watershed by using a battery of water column and sediment toxicity tests. a team of scientists from two Chesapeake Bay research laboratories worked jointly to complete this goal. Water column toxicity studies were directed by Lenwood W. Hall, Jr. of the University of Maryland System's Agricultural Experiment Station; sediment toxicity tests were managed by Raymond W. Alden,III of Old dominion University Applied Marine Reserach Laboratory. This report summarizes data from the third year of a three-year pilot study. The following government agencies were responsible for supporting and/or managing this research: U.S, Environmental Protection Agency, Maryland Department of Natural Resources and Maryland Depart of the Environment.

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Recommendations of the Invasive Catfish Task Force. Submitted to the Scientific and Technical Advisory Committee for peer review.

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This is the first in a series of newsletter to be produced by the Monitoring and Analysis Subcommittee (MASC). MASC coordinates and supports the monitoring activities of the Chesapeake Bay ecosystems, those factors that effect the health of the Bay and the restoration efforts. This newsletter summarizes four important water events that affected Chesapeake Bay during 2004. These being: 1) a large turbidity plume in the Bay's mainstem due to the remnants of Hurrican Ivan; 2) the worse harmful algal bloom within the Potomac River for 20 years; 3) a large volume of anxoic water (no dissolved oxygen) in the Bay's mainstem and; 4) unusually clear water and abundant plant occurence in the upper Bay.

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Better quantifying the "lag time" between changes in nutrient and sediment sources in the Chesapeake Bay watershed and improvement in the Bay's water quality and submerged aquatic vegetation (SAV) is critical to help resource managers to implement the most effective nutrient and sediment reduction strategies and for scientists to improve monitoring and modeling. Tributary strategy plan for basins with the Bay watershed have been developed to implement appropriate best management practice (BMPs) to reduce nutrient and sediment loads to the Bay. These practices are designed so water-waulity criteria (for dissolved oxygen, water clarity, and chlorophyll) can be met in the Bay by 2010/ However, there is a large degree of uncertainty about the "lag time" between implementing the nutrient and sediment practices and detecting and actual improvement of water quality and SAV in the Bay.

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This project seeks to develop strategies and priorities for arresting habitat deterioration and restoring lost habitats in estuaries through identification of critical zones for maintaining living resources. It uses as an examle one representative and importand estuarine species, the striped bass (Morone saxatilis. Data on summer water temperatures, dissolved oxygen concentrations, and stiped bass distribution in Chesapeake Bay and Albemarle Sound, Nort Carolina, were evaluated to determine/establish if critical zones existed for maintenance of populations. Criteria for habitat suitability for adults and subadults were those identified in freshwater reservoirs (<25 degrees and > 2 mg/L dissolved oxygen).

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REducing pollution from nonpoint sources has been one of the most difficult challenges in the Chesapeake Bay restoration effort. The states and the federal government have joined in mounting a comprehensive effort and the dollar resources that we have devoted to this challenge since 1983 are unprecedented. The nonpoint activities are coordinated by a regional committee which is part of the Bay Program's management structure. (See Part I for more information).

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Reducing pollution from nonpoint sources has been one of the most difficult challenges in the Chesapeake Bayrestoration effort. The states and the federal government have joined in mounting a comprehensive effort to define, quantify and control nonpoint source pollution. The level of effort and the dollar resources that we have devoted to this chalenge since 1983 are unprecedented. The nonpoint activities are coordinated by a regional committee which is part of the Bay Program's management structure.

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