Invasion
Invasion Description
1st record: Nahcotta Small Boat Basin)/WA/Willapa Bay (1979, Carlton 1979, as Botrylloides sp., Carlton 1989)
Geographic Extent
Nahcotta Small Boat Basin)/WA/Willapa Bay (1979, Carlton 1979); Nahcotta Small Boat Basin/WA/Willapa Bay 22 May 2000, Cohen et al. 2001, 46° 30’ 02.348 N; 124° 01’ 50.635); Wilson WA/Makah Bay (Grey 2010, fouling plates); Point/WA/Willapa Bay 1 May 2000, Cohen et al. 2001, 46° 38’ 57.879”N; 123° 57’ 09.608”; WA/Stackpole Slough, Willapa Bay, 22 May 2000, Cohen et al. 2001, 46° 36’ 21.345 N; 124° 02’ 35.516” W); Embarcadero Marine, Newport/OR/Yaquina Bay (2/25/2010, USGS Center for Aquatic Resource Studies 2010); Umpqua Triangle, Reedsport/OR/Winchester Bay (1986, Carlton 1989); Charleston Boat Basin/OR/Coos Bay (1978, Carlton, unpublished data; 2003, deRivera et al. 2005); Port Adams Jetty, Coos Bay/OR/Coos Bay (1988, Carlton, unpublished); OR/Coos Bay, South Slough (1988, Carlton, unpublished); Empire Pier, Coos Bay/OR/South Slough (2003, de Rivera et al. 2005); Port of Coos Bay Citrus Dock/OR/Coos Bay (2003, de Rivera et al. 2005); Valino Island/OR, South Slough, Coos Bay (2003, de Rivera et al. 2005); Woodley Island Marina/CA/Humboldt Bay (2001, Fairey et al. 2002; 2008, Nelson 2009); CA/Humboldt Bay (Fairey et al. 2002, Ruiz et al. unpublished data, Wonham et al. 2005; ; 2011, California Department of Fish and Wildlife 2014); Eureka Marina/CA/Humboldt Bay (2009, Wilson 2011)
Vectors
| Level | Vector |
|---|---|
| Alternate | Hull Fouling |
| Alternate | Oyster Accidental |
Regional Impacts
| Ecological Impact | Competition | |
| In fouling plate experiments in Humboldt Bay, (Nelson 2009) found that colonial tunicates (Botryllus schlosseri and Botrylloides violaceus), growing in sheets, were able to quicly occupy space on fouling plates, but did not decrease recruitment or species richness. | ||
| Ecological Impact | Food/Prey | |
| In feeding trials, the native crabs Hemigrapsus oregonensis, the flatworm Eurylepta leoparda and the nudibranch Hermissenda crassicornis fed heavily on the native tuinicate Distaplia occidentalis but at much lower rates on the non-native Botryllus schlosseri and Botrylloides violaceus) (Kincaid and de Rivera 2020). | ||