Invasion

Invasion Description

1st Record: Philadelphia-Trenton/DE/Delaware River (Cope 1879), 1st Record: NY/Hudson River (De Kay 1842; Mills et al. 1997), 1st Record: Hartford/CT/Connecticut River (1844, Whitowrth 1968);, 1st Record: Alexandria/VA/Potomac River (Uhler and Lugger 1876), 1st Record: Cambridge/Charles River (Storer 1839, cited by Hartel et al. 2002)

Geographic Extent

Trenton-Philadelphia-Wilmington/PA-NJ-DE/Delaware River (Cope 1879; Horwitz 1986; DE/Brandywine Creek (Raasch and Altemus 1991); DE/Chesapeake and Delaware Canal; PA/Schuylkill River (Fairchild, et al. 1992); DE/Appoquinimink Creek (Smith 1971); Wilmington to Chesapeake and Delaware Canal (1985-1992, Weisberg et al. 2005), NY/Upepr, Middle & Lower Hudson River, Mohawk River (Mills et al. 1997; Daniels et al. 2005); Staten Island/NY/Arthur Kill, New York Harbor (Briggs and Waldman 2002, stray), Hartford/CT/Connecticut River (1844, Whitowrth 1968); CT/coastal streams, VA/James River (Jenkins and Burkhead 1993, 1 tidal record); VA/Rappahannock River (Maurakis et al. 1987, 1 tidal record); Washington to the Wicomico River/DC-MD-VA/Potomac River (Uhler and Lugger 1876; Lippson et al. 1979; Killgore et al. 1989; Carmichael et al. 1992; Serafy et al. 1994; Ernst et al. 1995; Starnes et al. 2011; Kraus and Jones 2012); Susquehanna Flats/MD/Chesapeake Bay (Howarth 1961; Serafy et al. 1993); Edgewater/MD/Rhode River (Rob Aguilar, personal communication 2012); below Conowingo Dam/MD/Susquehanna River (McKeown 1984), Cambridge/Charles River (Storer 1839, cited by Hartel et al. 2002)