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Castrating parasites and colonial hosts

Published online by Cambridge University Press:  06 February 2012

H. HARTIKAINEN  and
B. OKAMURA
H. HARTIKAINEN
Affiliation:
School of Biological Sciences, University of Reading, Whiteknights, Reading, Berkshire RG6 6BX, UK
B. OKAMURA*
Affiliation:
School of Biological Sciences, University of Reading, Whiteknights, Reading, Berkshire RG6 6BX, UK
*
*Corresponding author: Department of Zoology, Natural History Museum, Cromwell Road, London SW7 5BD, UK. Tel: +44 (0)2079 426631. Fax: +44 (0)2079 425054. E-mail: [email protected]
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Summary

Trajectories of life-history traits such as growth and reproduction generally level off with age and increasing size. However, colonial animals may exhibit indefinite, exponential growth via modular iteration thus providing a long-lived host source for parasite exploitation. In addition, modular iteration entails a lack of germ line sequestration. Castration of such hosts by parasites may therefore be impermanent or precluded, unlike the general case for unitary animal hosts. Despite these intriguing correlates of coloniality, patterns of colonial host exploitation have not been well studied. We examined these patterns by characterizing the responses of a myxozoan endoparasite, Tetracapsuloides bryosalmonae, and its colonial bryozoan host, Fredericella sultana, to 3 different resource levels. We show that (1) the development of infectious stages nearly always castrates colonies regardless of host condition, (2) castration reduces partial mortality and (3) development of transmission stages is resource-mediated. Unlike familiar castrator-host systems, this system appears to be characterized by periodic rather than permanent castration. Periodic castration may be permitted by 2 key life history traits: developmental cycling of the parasite between quiescent (covert infections) and virulent infectious stages (overt infections) and the absence of germ line sequestration which allows host reproduction in between bouts of castration.

Keywords

Fredericella sultanaTetracapsuloides bryosalmonaeProliferative Kidney Diseasecovert infectionhost food levelstatoblast
Type
Research Article
Information
Parasitology , Volume 139 , Issue 4 , April 2012 , pp. 547 - 556
Copyright
Copyright © Cambridge University Press 2012

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