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Multilocus phylogenetic analyses reveal that habitat selection drives the speciation of Didymozoidae (Digenea) parasitizing Pacific and Atlantic bluefin tunas

Published online by Cambridge University Press:  23 December 2009

I. MLADINEO*
Affiliation:
Hopkins Marine Station, Stanford University, 120 Oceanview Blvd, Pacific Grove 93950 CA, USA
N. J. BOTT
Affiliation:
Aquatic Sciences, South Australian Research and Development Institute, PO Box 120, Henley Beach, South Australia 5022, Australia
B. F. NOWAK
Affiliation:
National Center for Marine Conservation and Resource Sustainability, AMC, University of Tasmania, Locked Bag 1370, Launceston, Tasmania 7250, Australia
B. A. BLOCK
Affiliation:
Hopkins Marine Station, Stanford University, 120 Oceanview Blvd, Pacific Grove 93950 CA, USA
*
*Corresponding author: Institute of Oceanography & Fisheries, Laboratory of Aquaculture, 21000 Split, Croatia. Tel: +38521408047. Fax: +38521358650. E-mail: [email protected]

Summary

Parasite communities of wild and reared bluefin tuna display remarkable diversity. Among these, the most prevalent and abundant are the Didymozoidae (Monticelli, 1888) (Trematoda, Digenea), considered one of the most taxonomically complex digenean families. The aim of this study was to evaluate phylogenetic structure of Didymozoidae occurring in Pacific (Thunnus orientalis) and Atlantic bluefin tuna (T. thynnus) in order to increase our knowledge of didymozoid zoogeography and identify species that could successfully be employed as biological tags for stock assessment studies. For the present analyses we used 2 nuclear ribosomal DNA loci, part of the 28S gene and the second internal transcribed spacer (ITS-2) as well as a portion of the mitochondrial cytochrome c oxidase subunit 1 gene (cox1). In most parasitic groups, morphology is the primary factor in the structuring of phylogenetic relationships. In rare examples, however, habitat has been suggested as a primary factor affecting parasite evolution. During their evolution, didymozoids have spread and inhabited a remarkable number of different sites in their hosts, colonizing exterior as well as strictly interior niches. Our data suggest that habitat selection has been the leading force in shaping didymozoid phylogenetic relationships. For 2 didymozoid species (D. wedli and D. palati), cox1 sequences indicate intraspecific differences between Mexican and Adriatic populations.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2009

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