Invasion
Invasion Description
1st Record: Woods Hole/MA/Buzzards Bay-Vineyard Sound (1992, McDermott 1998)
Geographic Extent
Gooseberry Island Westport/MA/Buzzards Bay (1996, Ledesma and O'Connor 2001); West Island (New Bedford)/MA/Buzzards Bay (1994, McDermott 1998); Bourne/MA/Cape Cod Canal (2000, MIT Sea Grant 2003); Falmouth/MA/Quissett Habor (1995, Fofonoff, unpublished data)
Vectors
| Level | Vector |
|---|---|
| Alternate | Natural Dispersal |
| Alternate | Ballast Water |
| Probable | Hull Fouling |
Regional Impacts
| Ecological Impact | Predation | |
| The replacement of C. maenas by H. sanguineus in rocky intertidal regions of Southern New England (Long Island to Cape Ann) has resulted in a likely increase in predation rates, due to much higher population densities of H. sanguineus (recorded in two field surveys near New Bedford and Woods Hole MA) (Griffen and Delaney 2007). | ||
| Ecological Impact | Competition | |
| Field sampling shows an overwhelming dominance of Hemigrapsus sanguineus over Carcinus maenas, both in numbers and biomass, at sites near New Bedford and Woods Hole (Griffen and Delaney 2007). | ||