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Establishment of the onset of host specificity in four phyllobothriid tapeworm species (Cestoda: Tetraphyllidea) using a molecular approach

Published online by Cambridge University Press:  27 April 2007

H. S. RANDHAWA ,
G. W. SAUNDERS  and
M. D. B. BURT
H. S. RANDHAWA*
Affiliation:
Department of Biology, University of New Brunswick, Fredericton, New Brunswick, CanadaE3B 4K6
G. W. SAUNDERS
Affiliation:
Department of Biology, University of New Brunswick, Fredericton, New Brunswick, CanadaE3B 4K6
M. D. B. BURT
Affiliation:
Department of Biology, University of New Brunswick, Fredericton, New Brunswick, CanadaE3B 4K6
*
*Corresponding author. Tel: +506 453 4583. Fax: +506 453 3583. E-mail: haseeb.randhawa@unb.ca
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Summary

A parasitological survey in the Bay of Fundy, Canada, resulted in the recovery of mature specimens from 5 species of phyllobothriid tapeworms (Cestoda: Tetraphyllidea) from 4 rajid skates: Echeneibothrium canadensis and E. dubium abyssorum specimens from Amblyraja radiata; E. vernetae and Pseudanthobothrium n.sp. from Leucoraja erinacea and L. ocellata; and P. hanseni from A. radiata and Malacoraja senta. Partial sequence data of a variable region (D2) from the large subunit ribosomal DNA (LSU) were used here to determine the host distribution of immature specimens for 4 of these 5 species (E. d. abyssorum was not included in the analyses). Immature specimens from both Pseudanthobothrium spp. were identified in the same hosts as recorded previously for mature specimens, thus suggesting that there are mechanisms that prevent the attachment of the parasite in an ‘unsuitable’ host species. Immature E. canadensis specimens were recovered exclusively from A. radiata, whereas immature E. vernetae specimens were recovered from L. erinacea and A. radiata, despite the latter host species not harbouring mature E. vernetae specimens. Their presence in the latter host species may be explained by host restriction or resistance, which allows the attachment of the parasites in the ‘wrong’ host species, but not establishment or development.

Keywords

host specificityonset of host specificityTetraphyllideaPhyllobothriidaeRajidaemolecular approachD2 domainlarge subunit of nuclear ribosomal DNA
Type
Research Article
Information
Parasitology , Volume 134 , Issue 9 , August 2007 , pp. 1291 - 1300
Copyright
Copyright © Cambridge University Press 2007

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