Species that are considered high risk have a well-documented history of invasiveness in at least one location globally, and a high or medium climate match to the contiguous United States.
C. fluminea has become an establishedin many parts of the United States. With a very high climate match, the species has the potential to establish across the country. The ease of spread, large numbers of offspring produced sexually or asexually, wide habitat tolerances, ability to outcompete native species, and potential to cause negative economic impacts make this a very high risk species.
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