Invasion

Invasion Description

Bousfield (1973) and Mills et al. (1997), suggest that G. daiberi was introduced by canals from Delaware Bay. Evidence for the canal vector is lacking. The Delaware and Hudson Canal was in operation only briefly, and was not a continous water connection, requiring boats to be hauled on inclined planes over the height of land (Baer 1991). This amphipod could easily be overlooked, given iis similarity to G. trigrinus and G. fasciatus.

Geographic Extent

1/4 mile south of Rte. 1 bridge, Westerly/RI/Pawcatuck River (1996, YPM IZ 021246, Yale-Peabody Museum 2015); CT/Long Island Sound (Cryptogenic? Spread through canals?- Bousfield 1973; Connecticut Sea Grant 2005)); NJ-NY/Hudson River Estuary (Cryptogenic? Spread through canals?- Bousfield 1973); NJ-DE/Delaware Bay (Bousfield 1973); MD-VA/Chesapealke Bay (Bousfield 1973)