Ecological Risk Screening Summary - Dikerogammarus gruberi (an amphipod, no common name) - Uncertain Risk

Species that are considered uncertain risk need a more in-depth assessment beyond the Risk Summary to better define the species’ risk to U.S. environments.

Dikerogammarus gruberi is a recently described freshwater amphipod that is native to Turkey. Little information is available about this species. It is only known from the location of the type specimen. It is not present in trade, and no introductions outside of its native range have been reported. The history of invasiveness is classified as No Known Nonnative Population. The climate match for the contiguous United States was categorically High. Most of the country had high or medium local matches with low local matches along the Pacific Coast, in the southwest, small areas of the Great Plains and northern northeast, and coastal southeast. The certainty of this assessment is low due to a general lack of information regarding this species, only a single observation of the species (type specimen), and a lack of information regarding history of invasiveness. The overall risk assessment category for Dikerogammarus gruberi is Uncertain.