Biological Invasions 9, 837-848 (2007)
Some invasive species, such as the European green crab, Carcinus maenas, are able to invade new environments because of brute strength. In a study conducted by a team of researchers from Rutgers University and Bloomfield College, C. maenas was tested to see how it fared in physical competition with other crab species.
Upon comparing the feeding habits and defensive and agnostic behaviors of C. maenas, another invasive species of crab, and the native blue crab, researchers found that, in addition to finding and consuming food more quickly than either other species, C. maenas is able to steal food from other crabs. It is also more likely to win fights, regardless of the initiator. Exceptions to these observations may be seen in the European green crab’s interactions with adult blue crab, the only group of crab possessing stronger carapaces than those of C. maenas. Established populations of adult blue crab may be able to contain the threat of C. maenas invasion.