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Bird schistosome diversity in Iceland: molecular evidence

Published online by Cambridge University Press:  01 June 2009

J.A. Aldhoun*
Affiliation:
Department of Parasitology, Charles University in Prague, Viničná 7, 128 44Prague 2, Czech Republic
L. Kolářová
Affiliation:
Department of Microbiology, National Reference Laboratory for Tissue Helminthoses, Institute for Postgradual Medical Education and First Faculty of Medicine, Charles University in Prague, Ruská 85, 100 05Prague 10, Czech Republic
P. Horák
Affiliation:
Department of Parasitology, Charles University in Prague, Viničná 7, 128 44Prague 2, Czech Republic
K. Skírnisson
Affiliation:
Institute for Experimental Pathology, University of Iceland, Keldur, Iceland
*
*Fax: +420 224919704 E-mail: atacama@centrum.cz

Abstract

During the years 2002–2007, Icelandic freshwater snails and birds from different orders were examined for bird schistosomes. Only the snail Radix peregra and anatid birds proved to be infected. In total, 32 samples of bird schistosome cercariae from seven localities and four samples of adults of Anas platyrhynchos and Mergus serrator from two localities were used for sequencing of the internal transcibed spacer (ITS) region of rDNA. Based on the sequence and position in the phylogenetic tree, five species/genotypes of bird schistosomes were identified. Three of them correspond to the sequences in GenBank for Trichobilharzia franki, Trichobilharzia sp. JR-2007 from Anas penelope (isolates Pl7 and Pl10) and schistosomatid sp. JR-2004 from Physa fontinalis. The other two species/genotypes belong to the genus Trichobilharzia, but their further determination was not possible due to lack of data. All of these species/genotypes develop in R. peregra, probably the only suitable intermediate host species in Iceland. As T. franki and schistosomatid sp. JR-2004 were previously reported from other snail species, the findings from Iceland proved that, under some circumstances, bird schistosomes are able to adapt to a different snail species; some of them can even adapt to a snail belonging to a different gastropod family. High diversity of bird schistosomes in Iceland is probably linked with migratory flyways of birds, as several bird species from Iceland overwinter in western Europe as well as in North America.

Type
Research Papers
Copyright
Copyright © Cambridge University Press 2009

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