Biological Invasions

, Volume 19, Issue 3, pp 765–772 | Cite as

Conspecific tolerance and heterospecific competition as mechanisms for overcoming resistance to invasion by an intertidal crab

  • Niels-Viggo S. HobbsEmail author
  • J. Stanley Cobb
  • Carol S. Thornber
Original Paper


The success of the invasive Asian shore crab, Hemigrapsus sanguineus, stems partly from its ability to exclude established crab species from preferred rocky and cobble intertidal habitat. Here, we assessed preference and competition for habitat types (cobble vs. sand) for H. sanguineus and two competitor species; the previous invasive green crab, Carcinus maenas, and the native rock crab, Cancer irroratus, in New England. In simple laboratory experiments, we paired similarly sized heterospecifics and conspecifics from each species, and also grouped combinations of C. maenas and H. sanguineus in a series of four-individual sets in order to dissect the outcome of intra- and inter-specific competition at different densities. Individually, all three species preferred cobble substrate. With paired conspecifics, H. sanguineus individuals would cohabitate in cobble, whereas C. maenas and C. irroratus individuals each excluded conspecifics from cobble. In heterospecific pairs, H. sanguineus excluded both C. maenas and C. irroratus from cobble. C. maenas and C. irroratus, were equally likely to exclude the other species, but rarely excluded H. sanguineus. In larger assemblages, H. sanguineus preferentially grouped under cobble, whereas C. maenas were more evenly distributed among habitat types. These observations demonstrate that conspecific tolerance and heterospecific competition can be effective, complementary mechanisms for overcoming invasion resistance. Such mechanisms help explain the well-studied success of H. sanguineus following its introduction into New England coastal habitats, and the resulting exclusion of preexisting crab species.


Habitat competition Conspecific tolerance Invasion resistance Hemigrapsus sanguineus Carcinus maenas Cancer irroratus Rocky intertidal 



We thank D. Bengtson, J. Kolbe, S. Menden-Deuer, E. Preisser, and G. Puggioni for invaluable feedback and constructive guidance. Thanks, too, to two anonymous reviewers whose thorough comments greatly improved this manuscript. D. Corideo, D. Hudson, R. Stadnick and D. Wieczorek helped greatly with crab collection, and set-up and maintenance of the experiments. Funding was provided by a graduate research Grant from the College of Arts and Sciences at the University of Rhode Island.


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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Niels-Viggo S. Hobbs
    • 1
    Email author
  • J. Stanley Cobb
    • 2
  • Carol S. Thornber
    • 2
  1. 1.Graduate Program, Biological and Environmental SciencesUniversity of Rhode IslandKingstonUSA
  2. 2.Department of Biological SciencesUniversity of Rhode IslandKingstonUSA

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