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Investigating the Effects of Anthropogenic Stressors on an Aquatic Top Predator

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Title: Investigating the Effects of Anthropogenic Stressors on an Aquatic Top Predator
Author: Ramshaw, Jeremy
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Rooney, NeilSibley, Paul
Abstract: Multiple anthropogenic stressors are simultaneously impacting ecosystems and interacting with each other at multiple scales. Marine and aquatic systems are especially susceptible to cumulative effects as they accumulate and distribute contaminants and nutrients and are used for a variety of human purposes. In this study, lake trout were sampled from differentially stressed locations in Georgian Bay, Ontario based on mapping data of anthropogenic stressors. First, I show that the relative weight, hepatosomatic index, relative brain weight, degree of littoral coupling and trophic position of lake trout are significantly different in the site with the lowest CAS score. Second, I used a canonical correlation analysis to show that specific human activities and stressors had different proportional effects on the biologic indicators used in this system. The results of this study can be used to inform environmental managers how to mitigate CAS in Georgian Bay.
URI: http://hdl.handle.net/10214/14751
Date: 2018-12-17
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