Filters: partyWithName: New York State Department of Environmental Conservation (X) > partyWithName: St. Regis Mohawk Tribe at Akwesasne (X)

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Benthic Communities and Sediment Toxicity in the St Lawrence River AOC Description of Work This study will generate bed sediment toxicity and benthic community data needed to test two related hypotheses that address the two criteria for delisting the benthos BUI. The first hypothesis is that bed sediments at selected sample locations in the AOC (in three tributaries and in the St. Lawrence River) are no more toxic to the test species than bed sediments collected from control sites located outside (generally upstream from) the AOC. Acute (survival) and chronic (growth) whole bed-sediment toxicity tests will be conducted using the midge (Chironomus dilutus), following standard methods (USEPA 1994; USEPA 2000). The second hypothesis is that the benthic macroinvertebrate communities from... Categories: Project; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Area of Concern, Areas of concern, Beneficial use impairment, Chironomus dilutus, GLRI, All tags... Great Lakes Restoration Initiative, Great Lakes Restoration Initiative, Lake, Lake:Lake Ontario, St. Lawrence River at Massena, Template 146, Toxic Substances, Uploaded in Batch, beneficial use impairment, bioassay, macroinvertebrate, sediment toxicity, Fewer tags Water Toxicity in the St. Lawrence River at Massena Area of Concern Description of Work Past water-quality issues in the St. Lawrence River at Massena, NY resulted in a determination that selected beneficial uses may be impaired in a surrounding Area of Concern (AOC) and on the Canadian side of the international boundary (Cornwall, Ontario). The plankton (phytoplankton and zooplankton) Beneficial Use Impairment (BUI) was so designated because impairment metrics were unavailable or inconclusive. Recent investigations, however, suggest that plankton communities are relatively healthy and no longer threaten the local ecosystem. Thus, the BUI for plankton may now be outdated in all, or parts of, the St. Lawrence River in the Massena AOC. The primary goal for the Massena (and Cornwall)... Categories: Project; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Area of Concern, Areas of concern, Beneficial use impairment, Ceriodaphnia dubia, GLRI, All tags... Great Lakes Restoration Initiative, Great Lakes Restoration Initiative, Lake, Lake:Lake Ontario, Plankton, Plankton Bioassay, Selenastrum capricornutum, St. Lawrence River, Template 146, Toxic Substances, Toxicity Test, Uploaded in Batch, beneficial use impairment, Fewer tags