Global
Figure 1. The global distribution of invasive NZMS populations ranges across 5 continents. NZMS are native to the freshwater lakes and streams of New Zealand and its surrounding islands.
National
Figure 2. NZMS distribution within the United States. Map provided and updated by the U.S. Geological Survey (USGS). Click on image to access interactive map.
Figure 3. NZMS were first discovered in the United States in Idaho in 1987 (Bersine et al. 2007). Currently, populations have been detected in 19 states (USGS).
Great Lakes Region
Figure 4.
NZMS were first discovered in the Great Lakes in 1991 (Zaranko et al. 1997). Populations have since been detected in all Great Lakes except Lake Huron and in inland waters of the Great Lakes region. There are seven states in the Great Lakes region with NZMS populations in inland waters (USGS): Minnesota (2005), New York (1991), Ohio (2006), Pennsylvania (2005), Illinois (2006), Wisconsin (2005), and Michigan (2013).