Invasion
Invasion Description
1st Record: CA/Bodega Harbor (2000, Fairey et al. 2002)
Geographic Extent
CA/Bodega Harbor (2000, Fairey et al. 2002; ; 2011, California Department of Fish and Wildlife 2014); Porto Bodega Marina/CA/Bodega Harbor (de Rivera et al. 2005); Mason's Marina/CA/Bodega Harbor (de Rivera et al. 2005)
Vectors
| Level | Vector |
|---|---|
| Probable | None |
Regional Impacts
| Ecological Impact | Competition | |
| Botrylloides violaceus was one of several invasive fouling species which showed increased growth (% coverage) at temperatures 3.5 and 4.5⁰C above the ambient temperature in Bodega Harbor (13.5⁰C), while the native Distaplia occidentalis showed reduced survival (Sorte et al. 2010). Botrylloides violaceus was one of a group of 7 non-native species, most of which were rare or absent in 1969-1971 surveys, but were among the 8 most abundant species in 2006. Spawning periods and abundance of species in this group appeared to be favored by a 1⁰C increase in average temperatures at this site over a 30-year period (Sorte and Stachowicz 2011). | ||