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Inhibition of the growth and reproduction of the porcellanid crab Pachycheles rudis by the bopyrid isopod, Aporobopyrus muguensis

Published online by Cambridge University Press:  06 April 2009

P. M. Van Wyk
Affiliation:
Department of Biological Sciences, University of California, Santa Barba-ra, California 93106

Extract

A population approach was employed to study the effects of a bopyrid isopod, Aporobopyrus muguensis, on the growth and reproduction of its anomuran host, Pachycheles rudis. Indirect evidence, provided by the size-specific prevalence pattern, and direct evidence, provided by laboratory moult frequencies and moult-stage data, indicated that the frequency of moulting was reduced among parasitized crabs. Moult increments of parasitized crabs were less than those of non-parasitized crabs. Although parasitized female P. rudis were able to reproduce, their fecundity was substantially reduced. Parasitized female hosts appeared to be delayed in their attainment of sexual maturity. Once mature, these crabs produced significantly smaller size-specific clutches than those produced by non-parasitized female crabs. Because fecundity increases with size in P. rudis, the slower growth rates of parasitized female hosts may further limit their fecundity. Potential mechanisms by which A. muguensis limits the growth and reproduction of P. rudis are discussed.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1982

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