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Effect of intermediate host size (Cerastoderma edule) on infectivity of cercariae of Himasthla quissetensis (Echinostomatidae: Trematoda)

Published online by Cambridge University Press:  27 June 2005

Xavier de Montaudouin
Affiliation:
Laboratoire d'Océanographie Biologique, UMR 5805 Université Bordeaux 1-CNRS, 2 rue du Pr Jolyet, F-33120 Arcachon, France
K. Thomas Jensen
Affiliation:
Department of Marine Ecology, Institute of Biological Sciences, University of Aarhus, Finlandsgade, 14, DK-8200 Aarhus N, Denmark
Céline Desclaux
Affiliation:
Laboratoire d'Océanographie Biologique, UMR 5805 Université Bordeaux 1-CNRS, 2 rue du Pr Jolyet, F-33120 Arcachon, France
Anne M. Wegeberg
Affiliation:
Department of Marine Ecology, Institute of Biological Sciences, University of Aarhus, Finlandsgade, 14, DK-8200 Aarhus N, Denmark
Marie C. Sajus
Affiliation:
Laboratoire d'Océanographie Biologique, UMR 5805 Université Bordeaux 1-CNRS, 2 rue du Pr Jolyet, F-33120 Arcachon, France

Abstract

The edible cockle (Cerastoderma edule), a common marine bivalve in semi-sheltered sandflats, is a natural host for many parasite species of the genus Himasthla (Echinostomatidae: Trematoda). In a previous paper, Wegeberg et al. (1999) showed segregation of cockle infection by three Himasthla species (H. interrupta, H. continua, H. elongata) in relation to host tissue (foot, mantle, siphon) and host size (1·5 to 14 mm shell length). Following the same experimental procedure, a fourth species, H. quissetensis, an introduced dominant parasite of cockles in Arcachon Bay (south-west France) was investigated. The infection pattern was very similar to the patterns shown by H. elongata and H. continua. Cercariae (the free-living stage shed from prosobranch snails and encysting as metacercariae in bivalves) were most successful in the shell-length range of 6–14 mm, where 74% of the added cercariae were recovered as metacercariae. The comparison with the other Himasthla species supports the previous conclusion that the efficiency of cercariae to infect cockles depends on host size.

Type
Research Article
Copyright
2005 Marine Biological Association of the United Kingdom

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