Invasion

Invasion Description

1st Record: CA/San Francisco Bay (1973, Cohen and Carlton 1995)

In San Francisco Bay, the abundance and dominance of B. violaceus varies with internnual cycles of precipitation and riverflow in the watershed. Botryllus violaceus at Richmond Marina, in the central Bay, is dominant during wet periods ( 22-28PSU), and less abundant and dominant during dry periods ( 28-33 PSU) (Chang et al. 2017).

Geographic Extent

CA/San Francisco Bay (1973, Cohen and Carlton 1995); Sierra Point Marina/CA/South San Francisco Bay (2004, Cohen et al. 2005); Pier 39, San Francisco/CA/San Francisco Bay (2004, Cohen et al. 2005) ;San Francisco Marina/CA/San Francisco Bay (2010, Marrafini et al. 2017); San Leandro Marina/CA/South San Francisco Bay (2004, Cohen et al. 2005; 2010, Marrafini et al. 2017); Coast Guard Island, Oakland/CA/Oakland estuary (2004, Cohen et al. 2005); Presidio Yacht Club, San Francisco/CA/Golden Gate (2004, Cohen et al. 2005); Richmond Marina/CA/San Francisco Bay (2004, Cohen et al. 2005; 2010, Marrafini et al. 2017); Pete's Harbor /CA/South San Francisco Bay (2004, Cohen et al. 2005); Coyote Point Marina/CA/South San Francisco Bay (2004, Cohen et al. 2005); Brisbane/CA/Brisbane Lagoon, South San Francisco Bay (2004, Cohen et al. 2005); Fruitvale Bridge, Alameda/CA/Oakland estuary (2004, Cohen et al. 2005);