The test substance, disulfoton, 0,0-diethyl S-[2-(ethylthio)ethyl]­ phosphorodithioate (C8H1902PS3) is a colorless oily liquid that is used commercially as an insecticide and acaricide. It is used for control of many ...

This report is the result of studies conducted in St. Louis River-Duluth Harbor in the summer of 1975. Specifically, three aspects of the harbor's biota were included, and are treated in subsequent sections. These ...

The Lake Superior Research Institute (LSRI), contracted with Blasland, Bouck & Lee, Inc. to measure lead concentrations in samples from seventeen sites and to evaluate the toxicity of sediment samples from ten of these ...

Chronic toxicity tests with the compound 2,4,5-trichlorophenol were conducted using the fathead minnow, Pimephales promelas Rafinesque. The tests were conducted with flowing water for a duration of 28 days at three ...

The twin ports of Superior, Wisconsin and Duluth, Minnesota were founded at the head of the world's greatest continuous mass of freshwater. The Laurentian Great Lakes contain about 20% of the world's freshwater resources. ...

This research investigates bioassay methods which may be useful in assessing the degree of pollution of harbor sediments. Procedures studied include 96 hr toxicity tests employing Hexagenia limbata, Daphnia magna and ...

Sediment samples from four Great Lakes harbors were evaluated for possible effects of toxic chemicals using a 10-day bioassay with larval stages of the insect, Chironomus tentans. The bioassay of each sediment was ...

Trees are widely viewed by the general public and scientists as very important for the well-being of the people who reside in cities, giving a pleasant aesthetic experience for the city dwellers, as a result of colorful ...

The Northwest Regional Planning Commission, the City of Superior and the Wisconsin Department of Natural Resources are with financial assistance from the Wisconsin Coastal Management Program, preparing a plan for long ...

PROJECT OBJECTIVES This study will provide information for an assessment of (1) the hazard po­tential of selected organic compounds for freshwater organisms, and (2) the use of aquatic organisms as biological screening ...