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 bispinosus is a freshwater amphipod native to the Ponto-Caspian region of Europe. D. bispinosus has been reported as introduced to the upper portions of the Black Sea basin, and to rivers draining into the Baltic and North seas. The impacts of these introductions are unknown, resulting in history of invasiveness being classified as Data Deficient. The climate match for the contiguous United States was categorically High. It was locally medium to high for most of the contiguous United States. The certainty of this assessment is Low due to a lack of biological information, uncertainty regarding the native and introduced range of this species and unknown impacts of introduction. The overall risk assessment category for D. bispinosus is Uncertain.
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Uncertain Risk
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