Invasion
Invasion Description
1st Records: Chula Vista Wharf/CA/San Diego Bay (1927, Johnson and Snook 1927, cited by Carlton 1979); San Pedro Docks, Los Angeles/CA/Los Angeles Inner Harbor (1927, Johnson and Snook 1927, cited by Carlton 1979)
Geographic Extent
San Pedro Docks, Los Angeles/CA/Los Angeles Inner Harbor (1927, Johnson and Snook 1927, cited by Carlton 1979); Island Yacht Anchorage, Los Angeles/CA/ Los Angeles Harbor (2000, Cohen et al. 2002);; Long Beach/CA/Colorado Lagoon (2000, Cohen et al. 2002); CA/Newport Bay (1962, Menzies 1962, cited by Carlton 1979); San Diego/CA/Mission Bay (1998, Crooks 1998); Coronado, San Diego/CA/San Diego Bay (1976, Carlton and Iverson 1981); 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); Baja California/Mexico/San Quintin Bay (1960, Menzies 1962, cited by Carlton 1979; USNM 109311, United States National Museum of Natural History 2007; Espinosa-Pérez & Hendrickx 2006, cited by Hendrickx, in Low-Pfeng, Antonio and Recagno 2012).Rodríguez-Almaraz and García-Madrigal 2014)
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). In the Bolsa Chica Reserve, Huntington Brach CA, S. quoianum decreased carbon content in sediement, and increased erosion rates (Brown et al. 2022). | ||