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.
Pontogammarus aestuarius is a freshwater amphipod native to the Ponto-Caspian Sea region. Very little information was found for this species regarding its biology and specific native range. Pontogammarus aestuarius has been recorded as introduced into Hungary but there was no scientific evidence found to back up this sighting and the original source did not provide any information on if establishment occurred or when this introduction happened. There were also no impacts of introductions found and no documented trade history. The History of Invasiveness is classified as No Known Nonnative Population. The overall Climate 6 score for Pontogammarus aestuarius was High. Most of the country had a locally medium to high climate match except for the middle and northern west coast which had low local climate matches. The certainty of assessment is Low because of the general lack of information for Pontogammarus aestuarius and the lack of impacts of introductions information found. The overall risk assessment category is Uncertain.
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