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Infestation of the squat lobster Munida gregaria (Anomura: Galatheidae) by Pseudione galacanthae (Isopoda: Bopyridae) in San Jorge Gulf, Argentina

Published online by Cambridge University Press:  06 July 2010

Martín Varisco  and
Julio Vinuesa
Martín Varisco*
Affiliation:
Instituto de Desarrollo Costero—Universidad Nacional de la Patagonia San Juan Bosco (IDC–UNPSJB) y Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Facultad de Ciencias Naturales. UNPSJB
Julio Vinuesa
Affiliation:
Instituto de Desarrollo Costero—Universidad Nacional de la Patagonia San Juan Bosco (IDC–UNPSJB) y Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Facultad de Humanidades y Ciencias Sociales, UNPSJB, Campus Universitario, Ruta 1 km 4 (9000) Comodoro Rivadavia, Chubut, Argentina
*
Correspondence should be addressed to: M. Varisco, Instituto de Desarrollo Costero—Universidad Nacional de la Patagonia San Juan Bosco (IDC–UNPSJB) y Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Campus Universitario, Ruta 1 km 4 (9000) Comodoro Rivadavia, Chubut, Argentina email: [email protected]
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Abstract

We estimated the prevalence of the bopyrid Pseudione galacanthae parasitizing the population of the squat lobster Munida gregaria in San Jorge Gulf and analysed some aspects concerning the effect of the parasite on host reproductive potential. The relationship between the development stages of the parasite and the host size was also analysed. The squat lobsters were caught as by-catch in the coastal area of the gulf from vessels operating in the fisheries of hake Merluccius hubbsi, southern king crab Lithodes santolla and Argentine red shrimp Pleoticus muelleri. The samples were collected between October 1997 and June 2009. In the laboratory, squat lobsters were sexed and the length of their carapace was measured. In males, the length of the right cheliped was recorded and gonadal development was examined. In females, the size and number of carried eggs were determined and the length of the pleopods III, IV and V were measured. All squat lobsters parasitized exhibit a gross bulge in the right side of carapace. Prevalence ranged between 0 and 1.43% (N = 21,519). No significant differences in prevalence were found for sexes, depths and seasons. The prevalence was higher for the size interval 7–10 mm CL (0.79%) than for the rest of the intervals. Parasitism had no effect on the secondary sex characters. Parasitized males displayed gonad development. There was no difference in prevalence between ovigerous and non-ovigerous squat-lobster females. Parasitized females had smaller eggs than non-parasitized ones, but their fecundity was similar. The linear relationship between the parasite and host sizes and the presence of larvae and immature stages of P. galacanthae in small-sized squat lobsters suggest that the host is infected early in its development. The low prevalence could be related to oceanographic conditions which favour larval dispersal of the parasite and host. The infestation by P. galacanthae has little impact on the M. gregaria population, mostly due to the low prevalences of infestation and the minor impact in reproductive function.

Keywords

parasitismprevalencebopyridGalatheidaeSouthern Atlantic Ocean
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 91 , Issue 8 , December 2011 , pp. 1681 - 1688
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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