Invasion
Invasion Description
1st record: CA/San Francisco Bay (1912, Shoemaker 1947, Carlton 1979)
Geographic Extent
cargo ship 'Florikan'/CA/Suisun Bay (Llanso et al. 2011); CA/Carquinez Straits (Cohen and Carlton 1995); Port San Pablo Yacht Harbor/CA/San Pablo Bay (Cohen et al. 2005); CA/San Pablo Bay (1963, USNM 111339, U.S. National Museum of Natural History 2015; Cohen and Carlton 1995); Petaluma/CA/Petaluma River (Cohen and Carlton 1995); Sierra Point Marina/CA/South San Francisco Bay (Cohen et al. 2005); San Leandro Marina/ CA/South San Francisco Bay (Cohen et al. 2005); Presidio Yacht Club, San Francisco/CA/Golden Gate (Cohen et al. 2005); Pete's Harbor/CA/South San Francisco Bay (Cohen et al. 2005); Coyote Point/CA/South San Francisco Bay ( Cohen et al. 2005); ; Main Estuarine Zone (Suisun-San Pablo, mean salinity 16.1 PSU) to Marine-Muddy Zone (South and Central Bays, mean salinity 27.5 PSU); CA/South Francisco Bay (2012-2013, Jimenez et al. 2017, common on hard and soft substrates)
Monocorophium acherusicum was first collected in San Francisco Bay in 1912, and now ranges throughout the estuary, into the brackish waters of Suisun Bay and the Delta, where it has been collected as far upstream as Collinsville (Antioch/CA/Sacramento-San Joaquin Delta (1976, Siegfried et al. 1980; Cohen and Carlton 1995); Cohen and Carlton 1995; Light et al. 2005).
Vectors
| Level | Vector |
|---|---|
| Alternate | Ballast Water |
| Alternate | Hull Fouling |
| Alternate | Oyster Intentional |
Regional Impacts
| Ecological Impact | Herbivory | |
| Nichols and Thompson (1985) suggested that an upstream movement of abundant suspension-feeding benthos, including M. acherusicum, was responsible for a decline in phytoplankton biomass in Suisun Bay during 1976-1977, a dry period of high salinity (Nichols and Thompson 1985). | ||