Notes on the Population Structure of the Portunid Crab Charybdis longicollis Leene, Parasitized by the Rhizocephalan Heterosaccus dollfusi Boschma, off the Mediterranean Coast of Israel
Abstract:The Levantine population of Charybdis longicollis, a Lessepsian migrant, has been parasitized recently by the sacculinid rhizocephalan, Heterosaccus dollfusi. Incidence of infestation, its effects on host's size, sex ratio and multiple infestation are examined. We recorded 77% infection rate with up to 57.6% of infested hosts bearing more than one extema. The rapid spread and the high prevalence of H. dollfusi can be ascribed to the dense population of the host and the year-round reproduction of the parasite promoting recurrent re-infection. As heavily-infested populations are presumably maintained by immigration, it is likely that the Levantine population of C. longicollis will suffer drastic perturbations, as it is doubtful whether immigration of non-infested crabs through the Suez Canal suffices for population renewal.
Document Type: Research Article
Publication date: May 1, 1999
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