Invasion

Invasion Description

1st Record: Coasters Harbor Island, Newport/RI/East Passage, Narragansett Bay (2000, MIT Sea Grant 2003-2007). Didemnum vexillum was present at 9 of 43 sites in 2005, but only 5 of 32 sites. Occurrences were correlated with salinity, and the species did not persist where surface salinitiesdropped bleow 20 PSU (Auker 2019).

Geographic Extent

South Pier, Prudence Island/RI/Narragansett Bay (2005, Auker and Oviatt 2008; Absent 2015, Auker 2019); Fort Wetherill, Jamestown/RI/East Passage, Narragansett Bay (2005, Auker and Oviatt 2008; Auker 2019); Jamestown Boatyard, Jamestown/RI/Narragansett Bay (Ruiz et al., unpublished data); New England Boatworks, Jamestown/RI/Narragansett Bay (Ruiz et al., unpublished data); Coasters Harbor Island, Newport/RI/East Passage, Narragansett Bay (2000, MIT Sea Grant 2003-2007) ; Fort Adams State Park/Newport/RI/Narragansett Bay (2010, Massachusetts Office of Coastal Zone Management 2013); URI Dock, Graduate School of Oceanography (2002, USGS Woods Hole Science Center 2003-2007; Auker and Oviatt 2008), ; 41 deg 29.3 min N lat, 71 deg 25.5 min W lo), Beavertail Point, Jamestown/RI/Narragansett Bay (2005, USGS Woods Hole Science Center 2007).