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Winning the arms race: host–parasite shared evolutionary history reduces infection risks in fish final hosts.

Sheath, D.J., Dick, J.T.A., Dickey, J.W.E., Guo, Z., Andreou, D. and Britton, J.R., 2018. Winning the arms race: host–parasite shared evolutionary history reduces infection risks in fish final hosts. Biology Letters, 14 (7), 1-4.

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Sheath et al parasite FR.full.pdf - Published Version
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DOI: 10.1098/rsbl.2018.0363


Parasite manipulation of intermediate hosts evolves to increase parasite trophic transmission to final hosts, yet counter selection should act on the final host to reduce infection risk and costs. However, determining who wins this arms race and to what extent is challenging. Here, for the first time, comparative functional response analysis quantified final host consumption patterns with respect to intermediate host parasite status. Experiments used two evolutionarily experienced fish hosts and two naive hosts, and their amphipod intermediate hosts of the acanthocephalan parasite Pomphorhynchus tereticollis. The two experienced fish consumed significantly fewer infected than non-infected prey, with lower attack rates and higher handling times towards the former. Conversely, the two naive fish consumed similar numbers of infected and non-infected prey at most densities, with similar attack rates and handling times towards both. Thus, evolutionarily experienced final hosts can reduce their infection risks and costs via reduced intermediate host consumption, with this not apparent in naive hosts.

Item Type:Article
Additional Information:Direct link to the officially published article on the publisher website: Copyright: 2018 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.
Uncontrolled Keywords:trophic transmission; parasite manipulation; behaviour; comparative functional response;
Group:Faculty of Science & Technology
ID Code:31064
Deposited By: Symplectic RT2
Deposited On:27 Jul 2018 09:42
Last Modified:14 Mar 2022 14:12


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