Biological Invasions

, Volume 18, Issue 6, pp 1653–1665 | Cite as

Estuarine fouling communities are dominated by nonindigenous species in the presence of an invasive crab

  • Aaren S. Freeman
  • Alejandro Frischeisen
  • April MH. Blakeslee
Original Paper


Interactions between anthropogenic disturbances and introduced and native species can shift ecological communities, potentially leading to the successful establishment of additional invaders. Since its discovery in New Jersey in 1988, the Asian shore crab (Hemigrapsus sanguineus) has continued to expand its range, invading estuarine and coastal habitats in eastern North America. In estuarine environments, H. sanguineus occupies similar habitats to native, panopeid mud crabs. These crabs, and a variety of fouling organisms (both NIS and native), often inhabit man-made substrates (like piers and riprap) and anthropogenic debris. In a series of in situ experiments at a closed dock in southwestern Long Island (New York, USA), we documented the impacts of these native and introduced crabs on hard-substrate fouling communities. We found that while the presence of native mud crabs did not significantly influence the succession of fouling communities compared to caged and uncaged controls, the presence of introduced H. sanguineus reduced the biomass of native tunicates (particularly Molgula manhattensis), relative to caged controls. Moreover, the presence of H. sanguineus favored fouling communities dominated by introduced tunicates (especially Botrylloides violaceous and Diplosoma listerianum). Altogether, our results suggest that H. sanguineus could help facilitate introduced fouling tunicates in the region, particularly in locations where additional solid substrates have created novel habitats.


Fouling community Mud crabs Invasion meltdown Tunicates Anthropogenic habitats Panopeus herbstii Hemigrapsus sanguineus Botrylloides violaceous Molgulamanhattensis Diplosoma listerianum 



For assistance with field work we would like to thank: Westley Blakeslee, Melanie Bram, James Brown, Steve Harstein, Zack Holmes, Isabela Kernin, Sara Kulins, Jaclyn Onufrey, and the Town of Hempstead Marina and Bay Constables. Comments from James T. Carlton and two anonymous reviewers improved this manuscript.


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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Aaren S. Freeman
    • 1
  • Alejandro Frischeisen
    • 1
    • 2
  • April MH. Blakeslee
    • 3
    • 4
  1. 1.Adelphi UniversityGarden CityUSA
  2. 2.Triumvirate EnvironmentalAstoriaUSA
  3. 3.East Carolina UniversityGreenvilleUSA
  4. 4.Smithsonian Environmental Research CenterEdgewaterUSA

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