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Welcome to the interactive web schedule for the 2019 Midwest Fish & Wildlife Conference! The schedule is subject to change (as of November 20, 2018). Please check back for updates. To return to the main Conference website, go to: www.midwestfw.org.

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Tuesday, January 29 • 2:00pm - 2:20pm
(SYMPOSIA-09) Effects of Carbon Dioxide on Dreissenid Mussels and Its Use a Management Tool

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AUTHORS: Diane Waller, USGS Upper Midwest Environmental Sciences Center; Michelle Bartsch, Upper Midwest Environmental Sciences Center; Eric Lord, Upper Midwest Environmental Sciences Center. ABSTRACT: Tools to control dreissenid mussel (Dreissena polymorpha and D. bugensis) populations currently rely heavily on chemical molluscicides that can be both costly and have the potential to be environmentally harmful if misused. Carbon dioxide may be a more cost-effective and environmentally neutral option for controlling dreissenid mussel populations. Past studies have demonstrated that carbon dioxide is lethal to several species of invasive molluscs, including zebra mussels, Asian clams (Corbicula fluminea), and New Zealand mud snails (Potamopyrgus antipodarum). We evaluated the effects of various treatment regimens [i.e., exposure duration and pCO<sub>2 </sub>(partial pressure of carbon dioxide)] on mortality, byssal thread formation and attachment, and narcotization behavior of adult zebra mussels. Percent mortality and time to death were determined at three temperatures across a range of pCO<sub>2</sub> levels (70,000 – 250,000 µm). Our results indicated that elevated PCO<sub>2</sub> exposure induced narcotization and reduced attachment of zebra mussels within 24 h. Time to death was inversely correlated with water temperature and pCO<sub>2</sub> and ranged from 3 – 13 d. The potential application of carbon dioxide into an integrated pest management program for dreissenid mussels will be discussed. 

Tuesday January 29, 2019 2:00pm - 2:20pm
HOPE BALLROOM C