Invasion
Invasion Description
1st record: Collinsville/CA/Sacramento River (1991, Cohen and Carlton 1995) Sikorski and Bick (2004) identify San Francisco Bay animals as M. neglecta but note that 'all the specimens investigated were small; therefore some doubt about their identity remains.' Recently examined specimens were identified as M. neglecta However, it is possible that both species are present (Leslie Harris, personal communication 2014).
Geographic Extent
Collinsville/CA/Sacramento River (1991, Cohen and Carlton 1995); CA/Lower Sacramento River (Peterson and Vayssieres 2010, common in wet years); Frank's Tract/CA/Sacramento-San Joaquin Delta (1992, Cohen and Carlton 1995); CA/Grizzly Bay (1992, Cohen and Carlton 1995; Peterson and Vayssieres 2010); CA/San Pablo Bay (1995, Cohen and Carlton 1995; Peterson and Vayssieres 2010); CA/South San Francisco Bay (1995, Cohen and Carlton 1995) ; Napa Valley Marina/CA/Napa River (2004, Cohen et al. 2005); cargo ship 'Florikan' CA/Suisun Bay (Llanso et al. 2011); Fresh-Brackish (Delta, mean 0.7 PSU) to Main Estuarine (Suisun-San Pablo, mean salinity 16.1 PSU, peak abundance at Fresh-Brackish-Estuairne transition, mean salinity 4.9 PSU, Lee et al. 2003).
Vectors
| Level | Vector |
|---|---|
| Probable | Ballast Water |
Regional Impacts
| Ecological Impact | Habitat Change | |
| Mucus from the tubes of Marenzellaria sp. as well as the mucus produced by other native and introduced deposit feeding and tube-building benthos, contributes to a surface layer of flocculent fluff, which may trap much more phytoplankton than that actually consumed by the animals (Jones et al. 2009). | ||