Being successful in the world of narrow opportunities: transmission patterns of the trematode Ichthyocotylurus pileatus | Parasitology | Cambridge Core (original) (raw)

Summary

Parasites with complex life cycles face 2 major challenges for transmission in northern latitudes. They have to cope with the general unpredictability associated with the series of transmission events required for completion of the cycle, and transmission has to be completed within a narrow temporal window because of strong seasonality. Despite this, some parasites show high transmission success, suggesting the operation of effective transmission mechanisms. We explored the transmission of Ichthyocotylurus pileatus (Trematoda) from its snail (Valvata macrostoma) to fish (Perca fluviatilis) hosts by examining some key characteristics in the dynamics of the cercarial emergence from snails. Transmission took place within a few weeks mainly in July, thus verifying the narrow temporal window for transmission. The output of the short-lived cercariae from the snails was low and variable in magnitude, but nevertheless resulted in a rapid and high rate of infection in newly hatched fish. The cercarial emergence showed a strong circadian rhythm with most of the cercariae emerging in early evening and night, which might represent the most likely mechanism underlying the high rate of transmission in this species. We emphasize the importance of holistic approaches combining aspects of multiple host species in studies on transmission of complex life-cycle parasites.

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