Invasion

Invasion Description

1st Record: Morrison Street BridgePortland/OR/Willamette River (Lampman

Geographic Extent

Astoria/OR/mouth of Columbia River (Chapman 1942); near Kalama/WA/Columbia River (Chapman 1942),WAPortland/OR/Willamette-Columbia Rivers (Farr and Ward 1993); Kelly Point Park/Portland/Columbia Slough (2002, Sytsma et al. 2004)