MEPS 393:83-96 (2009)  -  doi:10.3354/meps08225

Differential escape from parasites by two competing introduced crabs

April M. H. Blakeslee1,*, Carolyn L. Keogh2, James E. Byers3, Armand M. Kuris4 Kevin D. Lafferty5, Mark E. Torchin6

1Marine Invasions Lab, Smithsonian Environmental Research Center, 647 Contees Wharf Road, Edgewater, Maryland 21037, USA
2Environmental Studies Department, Emory University, Atlanta, Georgia 30322, USA
3Odum School of Ecology, University of Georgia, Athens, Georgia 30602, USA
4Department of Ecology, Evolution and Marine Biology, and Marine Science Institute, University of California, Santa Barbara, California 93106, USA
5Western Ecological Research Center, US Geological Survey, Marine Science Institute, University of California, Santa Barbara, California 93106, USA
6Smithsonian Tropical Research Institute, Apartado 0843-03092 Balboa, Ancon, Republic of Panama

ABSTRACT: Although introduced species often interact with one another in their novel communities, the role of parasites in these interactions remains less clear. We examined parasite richness and prevalence in 2 shorecrab species with different invasion histories and residency times in an introduced region where their distributions overlap broadly. On the northeastern coast of the USA, the Asian shorecrab Hemigrapsus sanguineus was discovered 20 yr ago, while the European green crab Carcinus maenas has been established for over 200 yr. We used literature and field surveys to evaluate parasitism in both crabs in their native and introduced ranges. We found only 1 parasite species infecting H. sanguineus on the US East Coast compared to 6 species in its native range, while C. maenas was host to 3 parasite species on the East Coast compared to 10 in its native range. The prevalence of parasite infection was also lower for both crabs in the introduced range compared to their native ranges; however, the difference was almost twice as much for H. sanguineus as for C. maenas. There are several explanations that could contribute to C. maenas’ greater parasite diversity than that of H. sanguineus on the US East Coast, including differences in susceptibility, time since introduction, manner of introduction (vector), distance from native range, taxonomic isolation, and the potential for parasite identification bias. Our study underscores not just that non-native species lose parasites upon introduction, but that they may do so differentially, with ramifications for their direct interactions and with potential community-level influences.


KEY WORDS: Carcinus maenas · Hemigrapsus sanguineus · Introduced species · Parasite richness · Parasite prevalence


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Cite this article as: Blakeslee AMH, Keogh CL, Byers JE, Kuris AM, Lafferty KD, Torchin ME (2009) Differential escape from parasites by two competing introduced crabs. Mar Ecol Prog Ser 393:83-96

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