Invasion

Invasion Description

1st Record: Big McNary Lake on Sauvie Island/OR/Columbia River (1995, Center for Aquatic Resource Studies 2009), 1st Record: CA/upper reaches of Mad River Slough and in essentially freshwater conditions in sloughs bordering Humboldt Bay (Boyd et al. 2002), 1st Record: Bandon Marsh National Wildlife Refuge,

Geographic Extent

Big McNary Lake on Sauvie Island/OR/Columbia River (1995, Center for Aquatic Resource Studies 2009); OR-WA/Columbia River estuary (Sytsma et al. 2004); Kelly Point Park, Portland/OR/Columbia Slough, Columbia River (2002, Center for Aquatic Resource Studies 2009); Longview /WA/Longview drainage ditch, Solo Storage entrance, Columbia River (2002, Center for Aquatic Resource Studies 2009), CA/upper reaches of Mad River Slough and in essentially freshwater conditions in sloughs bordering Humboldt Bay (Boyd et al. 2002), Brandon Marsh National Wildlife Refuge/OR/Coquille River estuary (2007-2013, Silver et al. 2017)