Invasion
Invasion Description
1st Record: Gloucester/MA/Gloucester Harbor, Massachusetts Bay (1999, USGS Nonindigenous Aquatic Species Program 2008)
Geographic Extent
Gloucester/MA/Gloucester Harbor, Massachusetts Bay (1999, USGS Nonindigenous Aquatic Species Program 2008); Deer Island, Winthrop/MA/Boston Harbor (2000, MIT Sea Grant 2003); Boston Harbor Islands/MA/Boston Harbor (Bell et al. 2005); Black Falcon Terminal, Boston/MA/Boston Harbor (2000, MIT Sea Grant 2008); Nahant/MA/Dorothy Cove, Baillie and Grabowsi 2018 (42 250N, 70 550W);
Vectors
Level | Vector |
---|---|
Alternate | Ballast Water |
Alternate | Hull Fouling |
Alternate | Natural Dispersal |
Regional Impacts
Ecological Impact | Predation | |
The replacement of C. maenas by H. sanguineus in rocky intertidal regions of the Southern Gulf of Maine (Cape Cod to Cape Ann) has resulted in a likely increase in predation rates, due to much higher population densities of H. sanguineus (field survey results from sites near Boston and Cape Ann, 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 Boston and Cape Ann (Griffen and Delaney 2007). | ||