2018 Update to “A risk assessment of potential Great Lakes aquatic invaders”

Four new species were added to the watchlist, including Arundo donax, Paraleptasticus wilsonii, Procambarus fallax f. virginalis, and Sparganium erectum. Scores were adjusted for several other species as new information was collected on their biology and behavior in the last several years and published in recent literature. A number of the “unknowns” in the previous version of this document were adjusted to reflect the addition of new information used to calculate their risk score. Twelve “unknown” values were changed to known values in this assessment, reflecting the growth in scientific knowledge and larger body of published literature available since the first edition of this document was published, as well as the importance of this project’s regular update cycle. GLERL Contribution No. 1929 Cooperative Agreement no. NA17OAR4320152 Contribution no. 1149