N.J. Morley, M. Crane and J.W. Lewis (2005) Toxicity of cadmium and zinc mixtures to the decaudized cercarial life span of Diplostomum spathaceum. Journal of Helminthology, 79 (). pp. 353–359. ISSN 0022-149X
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The effects of cadmium and zinc mixtures at concentrations ranging from 0.1 to 10,000mg l21 on the life-span of decaudized cercarial bodies (cercariae that have shed their tails) of Diplostomum spathaceum (Trematoda: Diplostomatidae) was investigated. Cercariae were exposed to metal mixtures of equal and unequal concentrations, and a low-dose pre-treatment followed by a high-dose exposure mixtures. Metal mixtures demonstrated variable effects on decaudized cercariae either by increasing or reducing their life-span compared to single metal exposures dependent on concentration and the type of mixed metal treatment. Prolonged exposure to equal metal mixtures at low concentrations (0.1–100mg l21) resulted in a reduction in the life-span of decaudized cercariae at 0.1 and 100mg l21 in those individuals decaudized during the initial 24 h exposure period compared with those decaudized during the final 24 h period of cercarial survival, whilst in controls there was no significant life-span change between the two time periods. Decaudized cercariae which were exposed to low concentrations (0.1–100mg l21) of equal metal mixtures were also evaluated for their role as an indicator of larval ‘fitness’ for migrating through the tissues of their target fish host for those individuals decaudized during the initial 24 h exposure period, and demonstrated only a limited change in their life-span compared to control and single metal exposures. The importance of metal mixtures in parasite establishment in the fish host is discussed.
This is a Published version This version's date is: 2005 This item is peer reviewed
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