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Evolution of interspecific variation in size of attachment structures in the large tapeworm genus Acanthobothrium (Tetraphyllidea: Onchobothriidae)

Published online by Cambridge University Press:  06 May 2010

H. S. RANDHAWA  and
R. POULIN
H. S. RANDHAWA*
Affiliation:
Department of Zoology, University of Otago, P.O. 56, Dunedin, New Zealand, 9054
R. POULIN
Affiliation:
Department of Zoology, University of Otago, P.O. 56, Dunedin, New Zealand, 9054
*
*Corresponding author: Tel: +64 3 479 4039. Fax: +64 3 479 7584. E-mail: haseeb.randhawa@otago.ac.nz
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Summary

Parasites have evolved a myriad of attachment structures closely adapted to their hosts and sites of attachment. Here, using members of the genus Acanthobothrium van Beneden, 1850 (Cestoda: Tetraphyllidea: Onchobothriidae), we (i) examined the influence of host body size and phylogeny, in addition to morphological features of these tapeworms, on the size of 3 structures used in attachment (bothridia, accessory suckers and hooks) by means of general linear models and phylogenetic-independent contrasts methods, and (ii) quantified the scaling exponents of relationships between size of attachment structures and tapeworm body size. Our results indicate that there exists a positive relationship, albeit not directly proportional, between size of attachment structures and Acanthobothrium spp. body size, and hook size and size of bothridia and accessory suckers. These results suggest that the resource investment in whole-body growth is greater than that in attachment structures, and that a greater investment in development of bothridia and accessory suckers is required to maintain an equivalent functional efficacy to hooks. In addition, host body size also influences, though less markedly, the size of attachment structures in Acanthobothrium spp. independently of parasite size itself. Acanthobothrium species have evolved a generalized mode of attachment that is successful in maintaining their position on various intestinal mucosal topographies across a variety of hosts exploiting different food resources.

Keywords

Acanthobothrium spp.allometric relationshipbody sizeElasmobranchgeneral linear modelhook sizephylogenetically-independent contrastsTetraphyllidea
Type
Research Article
Information
Parasitology , Volume 137 , Issue 11 , September 2010 , pp. 1707 - 1720
Copyright
Copyright © Cambridge University Press 2010

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