Invasion

Invasion Description

1st Record: near Richmond/VA/James River, river km 72 (1971, Diaz 1974)., 1st Record: Haddam Neck/CT/Connecticut River (Balcom 1994, Morgan et al. 2003; USGS Nonindigenous Aquatic Species Program 2007), 1st Record: New Brunswick/NY/Raritan River (absent from Hudson River proper) (Trama 1982); Fort Edward/NY/Hudson River (2008, BensoUSGS Nonindigenous Aquatic Species Program 2021 and Willimas 2021, 1st Hudson record), Philadelphia-Trenton/PA-NJ/Delaware River (1972, Fulton and Powell 1973; Crumb 1977), 1st Record: Watertown/MA/Charles River (2001, USGS Nonindigenous Aquatic Species Program 2008)

Geographic Extent

Conowingo Dam/MD/Susquehanna River (1980, Counts 1986; Nichols and Dommermuth 1981); Susquehanna Flats (Havre de Grace)/MD/Upper Chesapeake Bay (1980, Counts 1986; Nichols and Dommermuth 1981); Salisbury/MD/Wicomico River; Seaford/DE/Nanticoke River (1985, Counts 1986; Kennedy and Huekelem 1985; Counts 1991); Salisbury/MD/Wicomico River (1981, Counts 1986; Kennedy and Huekelem 1985); Potomac Electric Company plants, Alexandria/VA/Potomac River (Dresler and Cory 1980); Accokeek/MD/Piscataway Creek (Potomac River) (1978, Dresler and Cory 1980); Plummers Island/MD/Potomac River (nontidal, 2004, Pearce and Evans 2008, 3rd most abundant mollusk); near Richmond/VA/James River, river km 72 (1971, Diaz 1974); River Miles 45-80/VA/James River (1972, Diaz 1974); Near confluence/VA/Appomatox, Chickahominy Rivers (1972, Diaz 1974); Hog Island Point, Surry/VA/James River (Jordan and Sutton 1984)., Haddam Neck/CT/Connecticut River (Balcom 1994, Morgan et al. 2003; USGS Nonindigenous Aquatic Species Program 2007), New Brunswick/NY/Raritan River (absent from Hudson River proper) (Trama 1982); Champlain Canal at Fort Edward/NY/Hudson River (2008, Benson and Williams 2021; USGS Nonindigenous Aquatic Species Program 2021); Beacon/NYHudson River (2009; USGS Nonindigenous Aquatic Species Program 2021); Albany/NY/Hudson River (2009; USGS Nonindigenous Aquatic Species Program 2021), Philadelphia-Trenton/PA-NJ/Delaware River (1972, Fulton and Powell 1973; Crumb 1977); New Castle County/DE/Delaware River (1981, USGS Nonindigenous Aquatic Species Program 2012); Kings Hwy/NJ/Oldmans Creek, Lower Delaware River Basin, tidal portion (8/24/1995, USGS Nonindigenous Aquatic Species Program 2012), Watertown/MA/Charles River (2001, USGS Nonindigenous Aquatic Species Program 2008); Anderson Bridge, Cambridge/MA/Charles River (2003, Museum of Comparative Zoology, 2008)