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Wednesday, February 8 • 11:20am - 11:40am
Technical Session. Early Invasion Dynamics of New Zealand Mudsnails

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

ABSTRACT: New Zealand mudsnails (Potamopyrgus antipodarum) 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 and Boardman 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 2016 using targeted qualitative surveys.  The 2015 surveys show that the distribution in the Pere Marquette River encompassed at least 9.8 river miles. Preliminary surveys indicate that the range has expanded in 2016, but further sampling in the fall will refine estimates of the range.  The distribution in the Au Sable River shows a disjoint distribution, with patches occurring in the East Branch as well as the South Branch and mainstream of the river.  Information from a local conservation group suggests that the infestation in the Boardman River likely dates back to at least 2012. This infestation, however, went unreported until “unknown” snails in 2016 reached densities high enough to cause concern and ultimately lead the group to request confirmation of identification from taxonomic experts, which resulted in confirmation of New Zealand mudsnails.  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.

Wednesday February 8, 2017 11:20am - 11:40am
Grand Ballroom A

Attendees (4)