Behavioural and morphological observations have been conducted in specimens of flatworms (Dugesia gonocephala s.l.) treated with different ions such as zinc, lead, gold and silver. A copper-like activity of lead, gold and silver can be excluded; zinc-treated specimens show loss of motility comparable to the akinetic-end-phase described during copper exposure; the initial stage of copper-induced hyperkinesias probably depends upon a dopamine-like stimulation, specific to this ion.
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Con il contributo del Ministero per i Beni e le Attività Culturali