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Wednesday, January 27 • 10:20am - 10:40am
Water Quality Requirements and Preferences of the Topeka Shiner Notropis Topeka

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AUTHORS: Amanda Rosenberger, Missouri Cooperative Unit; Rory Mott*, University of Missouri

ABSTRACT: Water quality influences growth, development, and physiology of aquatic vertebrates. In particular, stable populations of the endangered Topeka shiner Notropis topeka have been linked to favorable water quality conditions. As is the case with many endangered fish, an assortment of biological and chemical factors are implicated in its decline, including stream channelization, sedimentation, pollution, and predation from nonnative stocked fishes. Current water quality assessments are based on lethal level experiments (e.g., LC50 tests), which are poorly suited for evaluating low level stressors. Conditions that test below threshold values may still impede growth and development; especially when considering the complex nature of compounding low level stressors. To aid The Missouri Department of Conservation (MDC) in the selection of reintroduction sites, our experiments will focus on exploring how sublethal water quality conditions influence the physiology and behavior of Topeka shiner. We will investigate the effects of dissolved oxygen, temperature, acclimation, nitrogenous waste, and chloride on Topeka shiner using non-lethal endpoints. To explore sublethal levels of selected parameters, our project objectives are twofold: (1) monitor Topeka shiner's behavioral responses to a gradual reduction in dissolved oxygen and (2) use critical swimming speed performance to determine thermal optima and sublethal effects of nitrogenous waste and chloride concentrations. We are incorporating preliminary data collected from the model species Cyprinella lutrensis to refine methodology and predict sublethal responses of Topeka shiner to common environmental stressors. This project will give insight to not only where Topeka shiners can persist, but also thrive; our focus on preference over tolerance allows selection of the most suitable reintroduction sites matching its physiological profile.

Wednesday January 27, 2016 10:20am - 10:40am EST
Emerald B

Attendees (6)