Invasion
Invasion Description
1st Record: Chula Vista Wharf/CA/San Diego Bay (1927, Johnson and Snook 1927, cited by Carlton 1979)
Geographic Extent
Chula Vista Wharf/CA/San Diego Bay (1927, Johnson and Snook 1927, cited by Carlton 1979) South Bay Ecological Preserve, National City/CA/San Diego Bay (1998, Talley et al. 2001); San Diego/CA/Paradise Creek-Connector Marsh (1998, Talley et al. 2001); Coronado, San Diego/CA/San Diego Bay (1976, Carlton and Iverson 1981)
Vectors
| Level | Vector |
|---|---|
| Alternate | Hull Fouling |
| Alternate | Ballast Water |
Regional Impacts
| Ecological Impact | Habitat Change | |
| Sphaeroma quoianum creates dense networks of tunnels in walls of marsh channels in San Diego Bay. Enclosure experiments showed that S. quoianum increases the rate of marsh erosion, roughly doubling it in steeply sloping areas. Estimated marsh loss due to S. quoianum in San Diego Bay can be as great as 1 m per year in some locations (Talley et al. 2001). | ||