Invasion
Invasion Description
1st Record: Ocean Park/WA/Willapa Bay (1945, Burch 1945, cited by Carlton 1979
Geographic Extent
Ocean Park/WA/Willapa Bay (1945, Burch 1945, cited by Carlton 1979; 1977, Carlton 1979); Naselle River Bridge/WA/Willapa Bay; WA/Willapa Bay (2000, Cohen et al. 2001); Omeara Point/WA/Willapa Bay (2000, Cohen et al. 2001); Round Island/WA/Willapa Bay (2000, Cohen et al. 2001); WA/Shoalwater Bay, Willapa Bay (2000, Cohen et al. 2001); Long Island South/WA/Willapa Bay (2000, Cohen et al. 2001); CA/Humboldt Bay (f1932, failed, Hanna 1966, Carlton 1979)
Vectors
| Level | Vector |
|---|---|
| Probable | Oyster Accidental |
Regional Impacts
| Ecological Impact | Predation | |
| The introduction of T. obsoleta resulted in the transport of 3 digenetic trematode species to Willapa Bay: Zoogonus lasius (as Z. rubellus); Himasthla quissetensis; Austrobilharzia variglandis. The first of these species has fishes as its final hosts; the last 2 have birds (shorebirds, gulls, cormorants, ducks) as final hosts (Blakeslee et al. 2012). The effect of these parasites on their final hosts is unknown. | ||