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Tuesday, January 30 • 4:20pm - 4:40pm
ASIAN CARP & OTHER AQUATIC INVASIVES: Early Detection Monitoring of New Zealand Mudsnails Using Qualitative and eDNA Surveys

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AUTHORS. Samantha Stanton, Michigan State University; Seth Herbst, Michigan Department of Natural Resources; William Keiper, Michigan Department of Environmental Quality; Daniel Hayes, Michigan State University

ABSTRACT. New Zealand mudsnails are a recent invader to the state of Michigan, and have generated considerable concern among resource managers.  New Zealand mudsnails were initially detected in non-targeted surveys in the Pere Marquette River in 2015, and have since been found in the Au Sable, Boardman, and Manistee Rivers.  Our first goal was to determine the spatial extent of this species in these rivers, and to determine how much the range has expanded in the Pere Marquette between 2015 and 2017 using targeted qualitative surveys.  The 2015 surveys show that the distribution in the Pere Marquette River encompassed at least 9.8 river miles. Surveys indicate that the range has expanded in 2017. In implementing these surveys, a natural question is how efficient are qualitative searches in detecting mudsnails when present.  As such, our second goal was to estimate the detection probability for qualitative surveys.  We implemented a split-plot type of sampling design, and found that when mudsnails were found in one sub-plot, they were also generally found in the other sub-plot, and rarely were there cases where they were found in only one sub-plot.  Finally, our third goal was to establish and evaluate early detection monitoring protocols for at-risk rivers using a combination of qualitative and environmental DNA surveys. 

Tuesday January 30, 2018 4:20pm - 4:40pm CST