Ecological Risk Screening Summary - Dreissena siouffi (a mussel, 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.

Dreissena siouffi is a freshwater mussel native the Euphrates River, in central Iraq and southern Turkey. D siouffi has not been reported outside of its native range and there was no indication this species is in trade. The history of invasiveness is classified as No Known Nonnative Population. The overall climate match for the contiguous United States was Medium. The climate match for Dreissena siouffi was generally low in the east half of the contiguous United States and in the Great Plains. Areas of high match were concentrated in the southern portion of California, areas surrounding the Sierra Nevada mountains and extending north into Washington and Idaho, and the Mojave Desert. The certainty of assessment is Low due to a lack of information regarding biology, ecology, and history of invasiveness. The lack of georeferenced observations to use in choosing source points for the climate match also contributes to the low certainty. The overall risk assessment category for D. siouffi is Uncertain.