Invasion
Invasion Description
1st Record: CA/South San Francisco Bay (1894, Stearns 1899, cited by Carlton 1979)
Geographic Extent
CA/Tomales Bay (Fairey et al. 2002); China Camp/CA/San Pablo Bay (2005, Robinson et al. 2011); CA/South San Francisco Bay (1894, Stearns 1899, cited by Carlton 1979); San Leandro Marina/CA/South San Francisco Bay (Cohen et al. 2005); Redwood city/CA/South San Francisco Bay (Miller et al. 2007); CA/Morro Bay (Needles 2007; Needles and Wendt 2012, present in a 1986 survey but not detected in 2005)
Vectors
| Level | Vector |
|---|---|
| Probable | Oyster Accidental |
Regional Impacts
| Ecological Impact | Habitat Change | |
| Closing shells can trap chicks and sever toes of adult endangered California Clapper Rails (Rallus longirostris obsoletus) in salt marshes (Carlton 1979; Cohen and Carlton 1995). | ||
| Ecological Impact | Food/Prey | |
| Geukensia demissa comprised 57% of the diet of the endangered California Clapper Rail (Rallus longirostris obsoletus) (Moffitt 1941, cited by Cohen and Carlton 1995). | ||