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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 7, 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 • 2:20pm - 2:40pm
(SYMPOSIA-09) Responses of Native Freshwater Mussels (Lampsilis) to Elevated Carbon Dioxide Concentrations in Acute and Chronic Exposures

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AUTHORS: Michelle Bartsch, Diane Waller – US Geological Survey, Upper Midwest Environmental Sciences Center

ABSTRACT: The potential use of carbon dioxide (CO<sub>2</sub>) as a control tool for Asian carp and dreissenid mussels has prompted investigation into the effects of elevated pCO2, under different scenarios, on native unionid mussels. We measured the lethal and sublethal responses of juvenile fat mucket (Lampsilis siliquoidea) and the federally endangered Higgins’ eye (L. higginsii) mussels to elevated pCO<sub>2</sub> in acute (96 h) and chronic (28 d) exposures. The lethal and sublethal responses included: survival, growth, byssal thread formation, behavior, and gene expression. In acute exposures, juvenile mussel survival was 100% after exposure to concentrations of 178 to 457 mg/L CO<sub>2</sub>. However, burial behavior and byssal thread formation were adversely affected during CO<sub>2</sub> exposure. Juvenile mussels recovered after a one-week post-exposure period as >40% of fat mucket reburied and >60% had produced new byssal threads. During chronic exposures to lower CO<sub>2</sub> concentrations (32 to 118 mg/L), significant mortality of juveniles occurred at =60 mg/L CO<sub>2</sub>. Sublethal effects of carbon dioxide on growth were evidenced by reduced shell growth and body condition (dry tissue weight: shell length). Expression of chitin synthase, key for shell formation, was downregulated at 28 days of exposure. The results indicate that the response of freshwater mussels to elevated pCO2 will vary with exposure pattern. Acute exposure to even extremely high pCO2 appears to be less harmful to juvenile mussels compared to extended exposure to sublethal concentrations of CO<sub>2</sub>.

Tuesday January 29, 2019 2:20pm - 2:40pm
HOPE BALLROOM C