Visual Ecology of Lake Erie Walleye with Andy Oppliger

My name is Andy Oppliger, I was fortunate enough to spend my summer at Stone Laboratory studying how turbidity (i.e. suspended particulates in the water column) alters the visual ecology of Lake Erie Walleye (Sander vitreus). The ability of an animal to distinguish between an object and its background (i.e. visual sensitivity) is expected to be altered by increasing turbidity due to both decreased light penetration and a change in the color of light underwater. My objective is to determine if varying turbidity types – algal or sedimentary – differentially influence visual sensitivities of adult Walleye. To determine how visual sensitivity is impacted by turbidity, an optomotor response apparatus was constructed (see photos below) to establish visual thresholds. This study contributes to our understanding of how Walleye populations may respond to changes in Lake Erie’s turbidity.



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