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The effects of parasitism by the rhizocephalan, Briarosaccus callosus Boschma on the lithodid crab, Paralomis granulosa (Jacquinot) in the Falkland Islands






Crustaceana (Leiden): 592: 156-170

The effects of parasitism by the rhizocephalan, Briarosaccus callosus Boschma on the lithodid crab, Paralomis granulosa (Jacquinot) in the Falkland Islands

The Rhizocephalan parasite Briarosaccus-callosus has been observed infesting a stock of Lithodidae Paralomis-granulosa from the Falkland Islands with a frequency of less than 1%. Infestation is detected through scarring or the presence of the parasite's reproductive sac or "externa". Crabs with externae are significantly more frequent and males of this category are of small size. Castration of hosts of both sexes by the parasite has been observed both during and after the infestation period. All parasitized females with externae or scars were non-ovigerous. Infested males did not attain morphological maturity as noted by relative claw size. For any given size, males with externae had claws smaller than those of juvenile males. As a result of parasitic feminization, relative claw dimensions of parasitized males were the same as those of unhurt females. After loss of the parasite, scarred males regain claw dimensions similar to those of juvenile males, or in some cases, achieve claw sizes which normally occur at maturity.

Accession: 002249371

DOI: 10.2307/20104590

Download PDF Full Text: The effects of parasitism by the rhizocephalan, Briarosaccus callosus Boschma on the lithodid crab, Paralomis granulosa (Jacquinot) in the Falkland Islands



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