Main content

Re-assessing the Degradation of Benthos Beneficial Use Impairment in the Toronto Harbour Area of Concern

Show simple item record

dc.contributor.advisor Sibley, Paul Stevack, Kathleen 2019-09-27T18:23:39Z 2019-09 2019-09-19 2019-09-27
dc.description.abstract Contaminated sediment impedes restoration in many Great Lakes Areas of Concern (AOCs), including the Toronto and Region AOC. In this study, I assessed the “Degradation of Benthos” Beneficial Use Impairment within the Toronto AOC utilizing the sediment quality tetrad (SQTet). The SQTet includes four lines of evidence: sediment chemistry, bioaccumulation, toxicity, and benthic community structure. Sediment chemistry was comparable to nearshore reference areas, except for some elevated emerging contaminants. Laboratory toxicity bioassays indicated acute and chronic toxicity associated with point sources, supported by invertebrate body burdens measured in laboratory exposures. The benthic invertebrate community has generally shown increases in diversity over time, however sites impacted by point sources significantly differ from reference conditions and exhibit degraded communities. This concurrence among lines of evidence supports the conclusion that while overall AOC sediment and benthic conditions have improved through time, point sources to the waterfront continue to result in impaired conditions. en_US
dc.description.sponsorship NSERC CREATE Great Lakes en_US
dc.language.iso en en_US
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International *
dc.rights.uri *
dc.subject benthic invertebrates en_US
dc.subject Great Lakes en_US
dc.subject Lake Ontario en_US
dc.subject sediment toxicology en_US
dc.subject bioaccumulation en_US
dc.subject sediment quality tetrad en_US
dc.subject risk assessment en_US
dc.title Re-assessing the Degradation of Benthos Beneficial Use Impairment in the Toronto Harbour Area of Concern en_US
dc.type Thesis en_US Environmental Sciences en_US Master of Science en_US School of Environmental Sciences en_US
dc.description.embargo 2020-09-20
dc.rights.license All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.

Files in this item

Files Size Format View
Stevack_Kathleen_201909_MSc.pdf 5.951Mb PDF View/Open

This item appears in the following Collection(s)

Show simple item record

Attribution-NonCommercial-NoDerivatives 4.0 International Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International