Invasion

Invasion Description

1st Record: Philadelphia-Trenton/DE/Delaware River (Cope 1879)

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)