IUCN threat status:

Least Concern (LC)


This invasive species has steadily increased its abundance in Europe and North America in the last 10-20 years, colonizing freshwater rivers and lakes and decimating native mussel populations through competitive interference. This species has increased in abundance to the extent that it is now displacing the highly invasive Zebra Mussel (D. rostriformis) (Ricciardi and Whoriskey 2004).

In a study by Schloesser and Masteller (1999) in Presque Isle Bay, Lake Erie, all native unionid (Unionidae) shells were found to be infested by dreissenids in 1991. In this year, they collected about 500 individual unionids belonging to fifteen species; in 1992, 246 individuals belonging to twelve species were collected; in 1993, 64 individuals of six species; in 1994, three individuals of three species; and in 1995, no unionids were found (Schloesser and Masteller 1999).

Population Trend


Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

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