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The Impact of Low Dissolved Oxygen and Recovery Patterns of Benthos in Northern Rivers Open Access


Other title
dissolved oxygen
northern rivers
benthic invertebrate recovery
eutrophication impacts
Type of item
Degree grantor
University of Alberta
Author or creator
Rychywolski, Kasper M
Supervisor and department
Yu, Tong (Civil and Environmental Engineering)
McEachern, Preston (Civil and Environmental Engineering)
Examining committee member and department
McEachern, Preston (Civil and Environmental Engineering)
Yu, Tong (Civil and Environmental Engineering)
Zhu, David (Civil and Environmental Engineering)
Chang, Scott (Renewable Resources)
Department of Civil and Environmental Engineering
Environmental Science
Date accepted
Graduation date
Master of Science
Degree level
An ecological risk assessment for the Athabasca River was done. We did a review of literature pertaining to ecological risk assessment in the Athabasca River. The focus of the risk assessment was on the ecological impact of low dissolved oxygen (DO), because mainly ice-cover and pulp mill effluent discharges on the Athabasca River may potentially cause a low DO event. The ecological impact of low DO was assessed for the benthic invertebrate community, specifically the Orders Ephemeroptera, Plecoptera and Trichoptera (EPT), which are sensitive to low DO, and the Order Diptera. Based on the literature review, an ecological risk assessment involved: 1) using electroshocking to simulate low DO in the Athabasca River and determining recovery of benthic invertebrates following electroshocking and ice-out; 2) using a laboratory flume to determine the relationship between DO level and benthic invertebrate drift rate.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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