Invasion
Invasion Description
1st Record: WA/Grays Harbor (1888, Collins 1892, cited by Palacios et al. 2000; 1905, Keep 1905, cited by Carlton 1979; 1977, Carlton 1979; Carlton 2023a)
Geographic Extent
WA/Grays Harbor (1888, Collins 1892, cited by Palacios et al. 2000; 1905, Keep 1905, cited by Carlton 1979; 1977, Carlton 1979; ); Moon Island & Grass Creek/WA/Grays Harbor (surviving populations, 1984, Palacios et al. 2000; Shell deposits indicate a much more extensive populatCarlton 2023aion which had a mass mortality in 1895-1997); near Hokiam/WA/Grass Creek, Grays Harbor (1999, Wilson amd Partidge 2007); WA/Beardslee Slough (1999, Wilson amd Partidge 2007)
Vectors
| Level | Vector |
|---|---|
| Probable | Fisheries Intentional |
Regional Impacts
| Ecological Impact | Habitat Change | |
| In Grays Harbor WA, large shell deposits provide a highly favorable habitat for settling Dungeness Crab (Metacarcinus magister) juveniles. High densities of these crabs may, in turn, limit the recruitment of M. arenaria. | ||