Ecological Risk Screening Summary - Obesogammarus olvianus (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.

Obesogammarus olvianus is a species of amphipod known from brackish and freshwater. A single record of the species presence in the Dniester River outside of Moldovan territory is the extent of distribution information that was available. No records of introduction were found. The history of invasiveness is classified as No Known Nonnative Population. The overall climate match was High. There were medium to high matches in the central contiguous United States as well as in the Great Lakes and New England. The climate match was based on a single report of the species presence in a river basin and not georeferenced observations or a full description of the range. This reduces the certainty of the interpretation of the climate match. The certainty of this assessment is Low due to a lack of available information for this species, including its range. The overall risk assessment category is Uncertain.