Species Regional Summary
Hemigrapsus sanguineus
Massachusetts Bay ( N170 )

Invasion History Vectors Impacts References

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 ImpactPredation
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 ImpactCompetition
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).
 

References

Full Reference List for Hemigrapsus sanguineus

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