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Effect of metacestodes of Hymenolepis diminuta on storage and circulating carbohydrates in the intermediate host, Tenebrio molitor

Published online by Cambridge University Press:  06 April 2009

J. Y. Kearns ,
H. Hurd  and
A. S. Pullin
J. Y. Kearns
Affiliation:
Centre for Applied Entomology and Parasitology, Department of Biological Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK
H. Hurd
Affiliation:
Centre for Applied Entomology and Parasitology, Department of Biological Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK
A. S. Pullin
Affiliation:
Centre for Applied Entomology and Parasitology, Department of Biological Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK
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Summary

The metamorphosis of oncospheres of the rat tapeworm, Hymenolepis diminuta, to mature metacestodes induces several pathophysiological effects in the intermediate host, Tenebrio molitor (Coleoptera). Previous investigations have failed to elucidate the mechanism responsible for changes in the host reproductive physiology and behaviour. This work forms part of an assessment of the degree to which nutrient resource management may be involved in these interactions. We report that developing metacestodes exert a pronounced effect upon host carbohydrate reserves and also alter circulating carbohydrate titres at some stages post-infection. Biochemical studies of fat body glycogen demonstrated a significant depletion of reserves as early as 3 days post-infection in males and 5 days post-infection in females. Gas chromatography revealed trehalose to be the predominant haemolymph carbohydrate, titres being significantly elevated in male beetles 5 and 9 days post-infection and in females 12 days post-infection. Metacestodes had no effect on glucose concentrations in male or female beetles.

Keywords

Hymenolepis diminutaTenebrio molitormetacestodeshost carbohydratesfat body
Type
Research Article
Information
Parasitology , Volume 108 , Issue 4 , May 1994 , pp. 473 - 478
Copyright
Copyright © Cambridge University Press 1994

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