Invasion

Invasion Description

1st Record: Martinez/CA/Lower Walnut Creek (1980, Leidy 2007)

1st Watershed Record: Los Gatos/CA/Vasona Reservoir (1961, Leidy 2007)

Geographic Extent

Martinez/CA/Lower Walnut Creek (1980, Leidy 2007); CA/Sacramento-San Joaquin Delta (1980, Light et al. 2005; 2003, Brown and Michniuk 2007, rare)