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Cercarial swimming performance and its potential role as a key variable of trematode transmission

Published online by Cambridge University Press:  14 July 2020

Neil J. Morley Open the ORCID record for Neil J. Morley [Opens in a new window]
Neil J. Morley*
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK
*
Author for correspondence: Neil J. Morley, E-mail: [email protected]
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Abstract

Trematode transmission in aquatic habitats from molluscan intermediate host to vertebrate or invertebrate target host is typically undertaken by a free-living stage known as cercariae. Active locomotion by cercariae is a key aspect of the transmission process with the swimming speed potentially contributing to infection success. Individual cercarial species swim at different speeds but the significance of this to infection potential has not been determined. This study, using data from the scientific literature, investigates the role of swimming speed in relation to cercarial morphology, host-searching strategies and target host species. Larger cercariae swim faster than smaller ones with tail length being the principal factor controlling locomotion rates. Different cercarial morphotypes swim at different speeds, in particular, furcocercariae, with the exception of the schistosomes, being faster swimmers than mono-tailed cercariae. Host-searching behaviour has a significant influence on swimming speeds with ‘active-searching’ strategies swimming slower than those adopting ‘active-waiting’ or ‘prey mimcry’ strategies. Vertebrate-infecting cercariae swim faster than those infecting invertebrates with species targeting fish demonstrating the highest locomotion rates and those targeting arthropods the slowest speeds. The adaptions of individual cercarial swimming speeds to biological variables and their interactions with the physical processes of aquatic habitats are discussed.

Keywords

Behaviourcercariaelocomotionspeedswimmingtransmission
Type
Research Article
Information
Parasitology , Volume 147 , Issue 12 , October 2020 , pp. 1369 - 1374
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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