Abstract
Parasites usurp host resources and, as a consequence, enhance their transmission and increase their fitness while reducing the fitness of their host. Performance capacity is a key predictor of fitness. Thus, the effects of parasites on host fitness may often be mediated by alteration of host performance. We tested the effect of the skeletal muscle dwelling myxozoan, Kudoa inornata, on the swimming performance in spotted seatrout, Cynoscion nebulosus. We predicted greater infection would result in reduced swimming performance. Unexpectedly, increasing density of K. inornata myxospores in seatrout skeletal muscle was related to increased fish swimming performance. The experiment was repeated and confirmed these unexpected results. The mechanisms underlying enhanced performance of an infected host are not understood, but their occurrence emphasizes the role of parasites as selective pressures on host evolution.
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Acknowledgements
We thank Dr. Mike Denson and staff from the South Carolina Department of Natural Resources Mariculture Division for providing fish and space and Pete Meier from the College of Charleston Grice Marine Laboratory for assisting with animal care.
Funding
This project was partially supported by U.S. National Science Foundation DBI-1062990.
Conflict of interest
The authors declare that they have no conflict of interest.
Ethical approval
Animal husbandry, experimental methods, and euthanasia procedures followed institutional ethical guidelines (College of Charleston, IACUC 2009–009).
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McElroy, E., George, A. & de Buron, I. The muscle dwelling myxozoan, Kudoa inornata, enhances swimming performance in the spotted seatrout, Cynoscion nebulosus . Parasitol Res 114, 2451–2457 (2015). https://doi.org/10.1007/s00436-015-4441-z
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DOI: https://doi.org/10.1007/s00436-015-4441-z
Keywords
- Fish
- Teleost
- Sciaenidae
- Parasite
- Myxosporea
- Speed