Identification of an avian schistosome recovered from Aythya novaeseelandia and infectivity of its miracidia to Lymnaea tomentosa snails.
A partial life cycle involving miracidia hatched from the eggs of Trichobilharzia sp. recovered from New Zealand scaup (Aythya novaeseelandia) to the release of furcocercariae by laboratory snails (Lymnaea tomentosa) was accomplished. Challenges with five and ten miracidia per snail were lethal. Challenge with three miracidia resulted in development to the daughter sporocyst stage and death in five, development to furcocercarial stage and death in one, and shedding of furcocercariae in one of seven snails. Observed lethality of schistosome miracidia to L. tomentosa may explain the low infection prevalence observed in the wild. Future work should plan challenge exposures of three or fewer miracidia to ensure snail survival and successful recovery of furcocercariae. The Trichobilharzia sp. found in the New Zealand scaup does not key morphologically to the literature. It may be a new species and further work is needed.
Davis
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Department of Zoology, University of Otago, Dunedin, New Zealand. davisn@xtra.co.nz
D000818:Animals; D004372:Ducks / Q000469:parasitology*; D006790:Host-Parasite Interactions; D007814:Larva / Q000254:growth & development; D008018:Life Cycle Stages; D008099:Liver / Q000469:parasitology; D008195:Lymnaea / Q000469:parasitology*; D008297:Male; D012551:Schistosomatidae / Q000254:growth & development / Q000302:isolation & purification*; D014201:Trematode Infections / Q000469:parasitology*