The Fish and Wildlife Service has developed a rapid risk screening process to determine a high, low, or uncertain level of risk for imported nonnative species. The process uses international databases, scientific literature, and a peer-reviewed model to match climate (via 16 climate variables) of a species in its native and invasive ranges with similar climates in the United States. The results indicate approximate geographic ranges in the United States where the climate is and is not similar to where the species survives elsewhere. The species’ history of invasiveness is then factored into the risk-screening model.
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