We used a comparative approach to investigate the effects of a copper-based pesticide (EarthTec® QZ) on embryos of an invasive snail (Bithynia tentaculata) and a native snail (Physa gyrina). Embryos were exposed to one of three treatments: control (0 mg/L Cu), low-dose (0.1 mg/L Cu), or high-dose (0.6 mg/L Cu), which reflect manufacturer-recommended low and medium 4-day molluscicide treatment concentrations. Exposure to 0.6 mg/L Cu over 4 days generated 100% mortality in both invasive and native snail embryos; however, reducing the exposure time from 4 to 1 day resulted in 100% mortality in B. tentaculata but some hatching (7%) in P. gyrina. In contrast, embryos of both species exposed to 0.1 mg/L Cu treatment for 4 days showed almost 100% survivorship. Further manipulations of Cu concentrations and exposure times may yield regimes that maximize mortality in B. tentaculata while minimizing negative impacts on native species.
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