151. Assessment of invasion risks for red swamp crayfish (Procambarus clarkii) in Michigan, USA.
- Author
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Smith, Kelley, Roth, Brian M., Herbst, Seth J., Thoma, Roger F., Popoff, Nicholas, Hayes, Daniel B., and Jones, Michael L.
- Subjects
RISK assessment ,INTRODUCED species ,PROCAMBARUS clarkii ,ECOSYSTEMS ,CRAYFISH - Abstract
Non-native invasive crayfish continue to threaten ecosystems across the globe. However, factors that increase the risk of these introductions and subsequent establishment have yet to be fully elucidated. This study takes place in the US state of Michigan, where in 2013 several carcasses of red swamp crayfish (Procambarus clarkii) were discovered at popular fishing locations. Following this discovery, we explored possible modes of entry P. clarkii might use to invade Michigan by visiting various retailers that sold live crayfish and surveying classroom use of crayfish. We visited retail shops in 2014 and again in 2015 to determine if these stores continued selling live red swamp crayfish following a ban on possession of live red swamp crayfish enacted in late 2014. However, in 2017 we discovered established populations of P. clarkii in several ponds in southeast Michigan and a lake in the southwest portion of the state. These discoveries offered an opportunity to qualitatively compare our assessment of potential vectors with an ongoing invasion and to determine the effectiveness of the prohibition on live P. clarkii sales. Our assessment of potential vectors indicated that classrooms and live food markets are the most likely sources of the invasion, but none of the vectors we explored were risk free. In particular, we found that the number of retail shops selling live P. clarkii in 2014 actually increased following the prohibition, indicating the need to ensure the cooperation of industry and individuals in preventing the introduction and spread of non-native invasive crayfish. The results of this study can be used by natural resource managers to help identify vectors that move non-native invasive crayfish across political boundaries and illustrate the importance of restricting and prohibiting the movement of non-native invasive species across boundaries, or into new ecosystems. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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