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Benthic Communities and Sediment Toxicity in the St Lawrence River AOC


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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 targeted sites within [...]


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The objective of this study is to determine if the benthos beneficial use is, or is not impaired in parts of the St. Lawrence River at Massena AOC. Benthic macroinvertebrate community data and bed sediment-toxicity test results will be used specifically to test whether bed sediments in the St. Lawrence River at Massena AOC meet established criteria for delisting the benthos BUI.

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