Linked Life Data

16863602

Source:http://linkedlifedata.com/resource/pubmed/id/16863602

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pubmed-article:16863602pubmed:dateCreated2006-10-23lld:pubmed
pubmed-article:16863602pubmed:abstractTextThe monogenean Gyrodactylus salaris Malmberg, 1957 is an economically important parasite on Atlantic salmon whereas the morphologically very similar G. thymalli Zitnan, 1960 on grayling is considered harmless. Even molecular markers cannot unambiguously discriminate both species. The nuclear internal transcribed spacer (ITS) sequences are identical in both species, and although mitochondrial cytochrome oxidase I (COI) sequences show substantial variation, no support for monophyly of either species is found. Analysis of nucleotide sequences of the intergenic spacer (IGS) have, however, been interpreted as support for 2 species. Here, IGS and COI sequences from 81 G. salaris and G. thymalli specimens of 39 populations across the species' distribution range were determined. Mitochondrial diversity was not reflected in the nuclear marker. Since various 23 bp IGS repeat types usually differ by just one nucleotide and sequences primarily differ in the number and order of repeat types, alignments may be biased and arbitrary, impeding meaningful phylogenetic analyses. The hypothesis that parasites on rainbow trout represent hybrids of both species is rejected. The presence or absence of particular repeat types is not considered informative. We interpret the IGS data as support for G. salaris and G. thymalli being a single species.lld:pubmed
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pubmed-article:16863602pubmed:authorpubmed-author:BachmannLLlld:pubmed
pubmed-article:16863602pubmed:authorpubmed-author:HansenHHlld:pubmed
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pubmed-article:16863602pubmed:pagination639-50lld:pubmed
pubmed-article:16863602pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:16863602pubmed:year2006lld:pubmed
pubmed-article:16863602pubmed:articleTitleThe incongruence of nuclear and mitochondrial DNA variation supports conspecificity of the monogenean parasites Gyrodactylus salaris and G. thymalli.lld:pubmed
pubmed-article:16863602pubmed:affiliationNatural History Museum, Department for Zoology, University of Oslo, PO Box 1172 Blindern, N-0318 Oslo, Norway. haakon.hansen@nhm.uio.nolld:pubmed
pubmed-article:16863602pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16863602pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed