Potential Impacts of a Western Pacific Grapsid Crab on Intertidal Communities of the Northwestern Atlantic Ocean |
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Authors: | VA Gerard RM Cerrato AA Larson |
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Institution: | (1) Marine Sciences Research Center, State University of New York, Stony Brook, NY 11794-5000, USA |
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Abstract: | Population density and size distribution, salinity tolerance, and feeding activity were examined in a western Pacific grapsid
crab, Hemigrapsus sanguineus, that was recently introduced to the mid-Atlantic coast of North America. Seasonal abundance on a boulder/cobble shore (Crane
Neck Pt.) in central Long Island Sound, New York, USA, during 1997–1998, ranged from 7 to 10 crabs m−2 averaged over the entire intertidal zone. Crabs occurred throughout the intertidal during summer and fall, but appeared to
move from high to low elevations during winter. In laboratory experiments, H. sanguineus tolerated salinity down to 10 ppt for 7 d, but showed significant preference for 20 or 27 ppt over 10 ppt. The crabs readily
consumed juvenile snails (Littorina littorea) and mussels (Mytilus edulis), as well as other common species of macroalgae and invertebrates occurring at Crane Neck Pt. High feeding rates and the
ability to consume littorine snails up to 13 mm in height and mussels up to 20 mm in length suggest that this nonindigenous
species has the potential to significantly affect the structure of rocky intertidal communities in the northwestern Atlantic
Ocean; however, rigorous field studies are needed to accurately determine the impact of this recent introduction.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | feeding grapsid crab Hemigrapsus sanguineus nonindigenous population density predation rocky intertidal |
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