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Seasonal changes in host phenotype manipulation by an acanthocephalan: time to be transmitted?

Published online by Cambridge University Press:  18 December 2008

D. P. BENESH ,
T. HASU ,
O. SEPPÄLÄ  and
E. T. VALTONEN
D. P. BENESH*
Affiliation:
Department of Evolutionary Ecology, Max-Planck-Institute for Evolutionary Biology, August-Thienemann-Strasse 2, 24306Plön, Germany
T. HASU
Affiliation:
Department of Biological and Environmental Science, POB 35, FI-40014University of Jyväskylä, Finland
O. SEPPÄLÄ
Affiliation:
EAWAG, Swiss Federal Institute of Aquatic Science and Technology, and ETH-Zürich, Institute of Integrative Biology (IBZ), Überlandstrasse 133, PO Box 611, CH-8600, Dübendorf, Switzerland
E. T. VALTONEN
Affiliation:
Department of Biological and Environmental Science, POB 35, FI-40014University of Jyväskylä, Finland
*
*Corresponding author: Department of Evolutionary Ecology, Max-Planck-Institute for Evolutionary Biology, August-Thienemann-Strasse 2, 24306Plön, Germany. Tel: +49 4522763258. Fax: +49 4522763310. E-mail: benesh@evolbio.mpg.de
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Summary

Many complex life cycle parasites exhibit seasonal transmission between hosts. Expression of parasite traits related to transmission, such as the manipulation of host phenotype, may peak in seasons when transmission is optimal. The acanthocephalan Acanthocephalus lucii is primarily transmitted to its fish definitive host in spring. We assessed whether the parasitic alteration of 2 traits (hiding behaviour and coloration) in the isopod intermediate host was more pronounced at this time of year. Refuge use by infected isopods was lower, relative to uninfected isopods, in spring than in summer or fall. Infected isopods had darker abdomens than uninfected isopods, but this difference did not vary between seasons. The level of host alteration was unaffected by exposing isopods to different light and temperature regimes. In a group of infected isopods kept at 4°C, refuge use decreased from November to May, indicating that reduced hiding in spring develops during winter. Keeping isopods at 16°C instead of 4°C resulted in higher mortality but not accelerated changes in host behaviour. Our results suggest that changes in host and/or parasite age, not environmental conditions, underlie the seasonal alteration of host behaviour, but further work is necessary to determine if this is an adaptive parasite strategy to be transmitted in a particular season.

Keywords

AcanthocephalaAsellus aquaticushost manipulationhost-parasite interactionhost pigmentationintermediate hostplastic/flexible behaviourseasonalitytrophic transmission
Type
Research Article
Information
Parasitology , Volume 136 , Issue 2 , February 2009 , pp. 219 - 230
Copyright
Copyright © 2008 Cambridge University Press

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