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Intra-specific host sharing in the manipulative parasite Acanthocephalus dirus: does conflict occur over host modification?

Published online by Cambridge University Press:  23 August 2004

T. C. SPARKES ,
V. M. WRIGHT ,
D. T. RENWICK ,
K. A. WEIL ,
J. A. TALKINGTON  and
M. MILHALYOV
T. C. SPARKES
Affiliation:
Department of Biological Sciences, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA
V. M. WRIGHT
Affiliation:
Department of Biological Sciences, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA Current address: Department of Marine Science, University of Southern Mississippi, 1020 Balch Boulevard, Stennis Space Center, MS 39529, USA.
D. T. RENWICK
Affiliation:
Department of Biological Sciences, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA
K. A. WEIL
Affiliation:
Department of Biological Sciences, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA Current address: Highland Park High School, 433 Vine Avenue, Highland Park, IL 60035, USA.
J. A. TALKINGTON
Affiliation:
Department of Biological Sciences, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA
M. MILHALYOV
Affiliation:
Department of Biological Sciences, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA
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Abstract

The acanthocephalan parasite Acanthocephalus dirus induces a colour change in the intermediate host, the aquatic isopod Caecidotea intermedius, which increases transmission to definitive hosts (creek chub, sunfish). We examined the potential for conflict to occur between infective (cystacanth) and non-infective (acanthor, acanthella) stages of A. dirus over the level of colour modification that should be induced when these stages share a host. Using a field survey, we showed that host sharing by infective and non-infective stages was relatively common and that infective and non-infective stages differed in their effects on colour modification. Non-infective stages induced a colour change over 40% of the body, whereas infective stages induced a colour change over 80%. Thus, conflict could occur between stages over the level of modification that should be induced. We then showed that mixed-stage infections induced a colour change in the host that was consistent with the level of modification induced by the infective stage. We discuss the potential significance of these results to patterns of host modification and their effects on stage-related survival in nature.

Keywords

developmental stageacanthellacystacanthcolour modificationisopodCaecidotea intermedius
Type
Research Article
Information
Parasitology , Volume 129 , Issue 3 , September 2004 , pp. 335 - 340
Copyright
© 2004 Cambridge University Press

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