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Patterns of a novel association between the scyphomedusa Chrysaora plocamia and the parasitic anemone Peachia chilensis

Published online by Cambridge University Press:  30 August 2012

Jose M. Riascos*
Affiliation:
Universidad de Antofagasta, Instituto de Investigaciones Oceanológicas, Climate Change Ecology Research Group, CENSOR Laboratory, Avenida Universidad de Antofagasta 02800, Antofagasta, Chile
Viviana Villegas
Affiliation:
Universidad de Antofagasta, Instituto de Investigaciones Oceanológicas, Climate Change Ecology Research Group, CENSOR Laboratory, Avenida Universidad de Antofagasta 02800, Antofagasta, Chile
Ignacio Cáceres
Affiliation:
Universidad de Antofagasta, Instituto de Investigaciones Oceanológicas, Climate Change Ecology Research Group, CENSOR Laboratory, Avenida Universidad de Antofagasta 02800, Antofagasta, Chile
Jorge E. Gonzalez
Affiliation:
Programa de Doctorado en Ciencias Aplicadas, mención sistemas marinos costeros, Universidad de Antofagasta
Aldo S. Pacheco
Affiliation:
Universidad de Antofagasta, Instituto de Investigaciones Oceanológicas, Climate Change Ecology Research Group, CENSOR Laboratory, Avenida Universidad de Antofagasta 02800, Antofagasta, Chile
*
Correspondence should be addressed to: J.M. Riascos, Universidad de Antofagasta, Instituto de Investigaciones Oceanológicas, Climate Change Ecology Research Group, CENSOR Laboratory, Avenida Universidad de Antofagasta 02800, Antofagasta, Chile email: josemar.rv@gmail.com

Abstract

Jellyfish display strong population variability. Competitive interactions between fish and jellyfish have been depicted as a major mechanism controlling this variability. Biological associations involving jellyfish are, however, more diverse than predation–prey interactions and remain poorly understood. Parasitic associations in particular may have relevant effects on jellyfish host populations. We studied basic patterns (temporal patterns of parasite intensity–biomass and the distribution pattern of parasites among hosts) of the association between the parasitic anemone Peachia chilensis and its scyphozoan host, Chrysaora plocamia. The mean number of parasites per host (MI) was high (average = 465) and showed significant differences during the pelagic life phase of the medusa. The mean biomass of parasites per host was also significantly different among months but showed a different temporal pattern to that of MI, which may reflect recruitment pulses of parasitic larvae. The mean biomass of P. chilensis per host averaged 56.3 mg ash-free dry mass, which represents a trophic flow of energy probably linking pelagic and benthic food webs. The distribution of parasites among hosts was best fitted to the negative binomial distribution model, as typical for host–parasite systems. We concluded that the parasite-induced host mortality and reduction of fecundity, represented by parasitic castration, is restricted to a few hosts and is therefore under the expected levels that characterize the dynamic equilibrium of host–parasite systems.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012 

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