Abstract
The longitudinal and vertical distribution of the whelk Velacumantus australis infected with Austrobilharzia terrigalensis, Stictodora lari and Philopthalmus burrili in the Swan estuary, Western Australia, is described. The frequency of infection by these trematodes and the influence of snail density on the prevalence rates are also discussed. The hypothesis that A. terrigalensis does not occur as single infections in V. australis is supported and the critical levels of density of prior-infected snails and prevalence of prior-infection are estimated for the Swan estuary.
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