The effects of parasitism by the barnacle Loxothylacus panopaei (Gissler) (Cirripedia: Rhizocephala) on growth and survival of the host crab Rhithropanopeus harrisii (Gould) (Brachyura: Xanthidae)
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چکیده
The crab Rhithropanopeus harrisii (Gould) (Brachyura; Xanthidae) was infected in the laboratory with the parasitic barnacle Loxothylacus panopaei (Gissler) (Cirripedia; Rhizocephala). Crabs and barnacles were collected in the Rhode River in the Chesapeake Bay, MD. Forty-three out of 153 R. harrisii, including stages from megalopa «1 mm of carapace width) to crab 8 stage (:±:8 mm of carapace width), developed a mature parasite (externa) after exposure to rhizocephalan cypris larvae. The duration of the internal phase of the parasite (from infection to the emergence of the externa) averaged 33 days and was independent of host size. Recently emerged externae (virgin externae) exposed to male cypris larvae, matured after fertilization in an average of 15 days. Host molting frequency and molt increments did not differ significantly between parasitized and control crabs. Survival to the crab 9 stage (:±:9.5 mm of carapace width) was 6% for hosts parasitized during the megalopal stage «1 mm of carapace width), while it was 50% for the controls. The results of this study are discussed relative to the prevalences of L. panopaei found in the Chesapeake Bay.
منابع مشابه
Genetic diversity and expanding nonindigenous range of the rhizocephalan Loxothylacus panopaei parasitizing mud crabs in the western north Atlantic.
Nonindigenous parasite introductions and range expansions have become a major concern because of their potential to restructure communities and impact fisheries. Molecular markers provide an important tool for reconstructing the pattern of introduction. The parasitic castrator Loxothylacus panopaei, a rhizocephalan barnacle, infects estuarine mud crabs in the Gulf of Mexico and southeastern Flo...
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> Abstract Several aspects of phylogenetic relationships among barnacles (Cirripedia) are still unresolved. One of the contentious issues is the position of the parasitic Rhizocephala. In most molecular phylogenies Rhizocephala are resolved as sister group to a monophyletic Thoracica. However, since Rhizocephala are morphologically highly derived there is not a single morphological character su...
متن کاملپارامترهای رشد و مرگ و میر و طول بلوغ خرچنگ (Gould, 1841 Rhithropanopeus harrisii) در خلیج گرگان
This article has no abstract.
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