, Volume 590, Issue 1, pp 95–101 | Cite as

Modus vivendi: invasive host/parasite relations—Charybdis longicollis Leene, 1938 (Brachyura: Portunidae) and Heterosaccus dollfusi Boschma, 1960 (Rhizocephala: Sacculinidae)

  • Gianna Innocenti
  • Bella S. Galil
Invasive Crustacea


Parasitic castrators, specifically rhizocephalan barnacles, considered as important regulators of host population density, were proposed as control agents for invasive decapod crustaceans. The temporal variability of the invasive parasitic barnacle Heterosaccus dollfusi prevalence was examined a decade after its introduction into the Mediterranean, with the purpose of elucidating whether it is indeed an efficient control agent of its invasive host, the swimming crab, Charybdis longicollis. Despite the high prevalence of the parasite and its injurious impact on the host reproduction, the Erythrean invasive host-parasite pair reached a modus vivendi with no noticeable reduction in the host population, and high rates of infestation and multiple infestation. It is suggested that high fecundity, “size refuge” formed by parasite-free larger males, and “open” recruitment dynamics, keep the population density of C. longicollis high enough to allow H. dollfusi, with its “closed” recruitment dynamics, to maintain its pandemic infection rates.


Charybdis Heterosaccus Invasive species Host/parasite interaction Erythrean invasion Eastern Mediterranean 



We wish to thank Mel Cooper for his assistance in assembling the Israeli material, and Baki Yokes, for information on the Charybdis-Heterosaccus populations off SE Turkey. Stefano Cannicci provided assistance with statistical analysis. This manuscript was much improved by the comments of Catherine deRivera, Mark Torchin and an anonymous reviewer.


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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Museo di Storia Naturale, Sezione Zoologica “La Specola”Università degli Studi di FirenzeFirenzeItaly
  2. 2.National Institute of OceanographyIsrael Oceanographic and Limnological ResearchHaifaIsrael

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