Initial steps of speciation by geographic isolation and host switch in salmonid pathogen Gyrodactylus salaris (Monogenea: Gyrodactylidae)q
To test the hypothesis that host-switching can be an important step in the speciation of gyrodactylid monogenean flatworms, we inferred the phylogeny within a cluster of parasites morphologically close to Gyrodactylus salaris Malmberg 1957, collected from Atlantic, Baltic and White Sea salmon (Salmo...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.454.1050 2023-05-15T17:00:22+02:00 Initial steps of speciation by geographic isolation and host switch in salmonid pathogen Gyrodactylus salaris (Monogenea: Gyrodactylidae)q Jussi Kuuselaa Marek S. Ziętarab Jaakko Lummea The Pennsylvania State University CiteSeerX Archives 2003 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.1050 http://cc.oulu.fi/~jlumme/initialsteps.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.1050 http://cc.oulu.fi/~jlumme/initialsteps.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://cc.oulu.fi/~jlumme/initialsteps.pdf text 2003 ftciteseerx 2016-01-08T06:04:13Z To test the hypothesis that host-switching can be an important step in the speciation of gyrodactylid monogenean flatworms, we inferred the phylogeny within a cluster of parasites morphologically close to Gyrodactylus salaris Malmberg 1957, collected from Atlantic, Baltic and White Sea salmon (Salmo salar), farmed rainbow trout (Oncorhynchus mykiss), and grayling (Thymallus thymallus) from Northern Europe. The internal transcribed spacer region of the nuclear ribosomal gene was sequenced for taxonomic identification. Parasites on grayling from the White Sea Basin differed from the others by one nucleotide (0.08%), the remainder were identical to the sequence published earlier from Norway (G. salaris on salmon), England (Gyrodactylus thymalli on grayling), and the Czech Republic (unidentified salaris/thymalli on trout). For increased resolution, 813 nucleotides of the mitochondrial COI gene of 88 parasites were sequenced and compared with 76 published sequences using phylogenetic analysis. For all tree building algorithms (NJ, MP), the parasites formed a star-like phylogeny of six definite sister clades, indicating nearly simultaneous radiation. Average K2P distances between clades were 1.8–2.6%, and internal mean distances 0.2–1.1%. The genetic distance to the nearest known relative, Gyrodactylus lavareti Malmberg, was 24%. A variable salmon-specific mitochondrial Clade I was observed both in the Baltic Basin and in pathogenic populations introduced to the Atlantic and White Sea coasts. An invariable Clade II was common in rainbow trout farms in Sweden, Denmark and Finland; the same haplotype was also infecting salmon in a landlocked population in Russian Karelia, and in Oslo fjord and Sognefjord in Norway. Four geographically vicariant sister clades were observed on graylings: Clade III in the Baltic Sea Basin; Clade IV in Karelian rivers draining to the White Sea; Clade V in Text karelia* karelian Salmo salar White Sea Unknown Norway White Sea |
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Open Polar |
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English |
description |
To test the hypothesis that host-switching can be an important step in the speciation of gyrodactylid monogenean flatworms, we inferred the phylogeny within a cluster of parasites morphologically close to Gyrodactylus salaris Malmberg 1957, collected from Atlantic, Baltic and White Sea salmon (Salmo salar), farmed rainbow trout (Oncorhynchus mykiss), and grayling (Thymallus thymallus) from Northern Europe. The internal transcribed spacer region of the nuclear ribosomal gene was sequenced for taxonomic identification. Parasites on grayling from the White Sea Basin differed from the others by one nucleotide (0.08%), the remainder were identical to the sequence published earlier from Norway (G. salaris on salmon), England (Gyrodactylus thymalli on grayling), and the Czech Republic (unidentified salaris/thymalli on trout). For increased resolution, 813 nucleotides of the mitochondrial COI gene of 88 parasites were sequenced and compared with 76 published sequences using phylogenetic analysis. For all tree building algorithms (NJ, MP), the parasites formed a star-like phylogeny of six definite sister clades, indicating nearly simultaneous radiation. Average K2P distances between clades were 1.8–2.6%, and internal mean distances 0.2–1.1%. The genetic distance to the nearest known relative, Gyrodactylus lavareti Malmberg, was 24%. A variable salmon-specific mitochondrial Clade I was observed both in the Baltic Basin and in pathogenic populations introduced to the Atlantic and White Sea coasts. An invariable Clade II was common in rainbow trout farms in Sweden, Denmark and Finland; the same haplotype was also infecting salmon in a landlocked population in Russian Karelia, and in Oslo fjord and Sognefjord in Norway. Four geographically vicariant sister clades were observed on graylings: Clade III in the Baltic Sea Basin; Clade IV in Karelian rivers draining to the White Sea; Clade V in |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Jussi Kuuselaa Marek S. Ziętarab Jaakko Lummea |
spellingShingle |
Jussi Kuuselaa Marek S. Ziętarab Jaakko Lummea Initial steps of speciation by geographic isolation and host switch in salmonid pathogen Gyrodactylus salaris (Monogenea: Gyrodactylidae)q |
author_facet |
Jussi Kuuselaa Marek S. Ziętarab Jaakko Lummea |
author_sort |
Jussi Kuuselaa |
title |
Initial steps of speciation by geographic isolation and host switch in salmonid pathogen Gyrodactylus salaris (Monogenea: Gyrodactylidae)q |
title_short |
Initial steps of speciation by geographic isolation and host switch in salmonid pathogen Gyrodactylus salaris (Monogenea: Gyrodactylidae)q |
title_full |
Initial steps of speciation by geographic isolation and host switch in salmonid pathogen Gyrodactylus salaris (Monogenea: Gyrodactylidae)q |
title_fullStr |
Initial steps of speciation by geographic isolation and host switch in salmonid pathogen Gyrodactylus salaris (Monogenea: Gyrodactylidae)q |
title_full_unstemmed |
Initial steps of speciation by geographic isolation and host switch in salmonid pathogen Gyrodactylus salaris (Monogenea: Gyrodactylidae)q |
title_sort |
initial steps of speciation by geographic isolation and host switch in salmonid pathogen gyrodactylus salaris (monogenea: gyrodactylidae)q |
publishDate |
2003 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.1050 http://cc.oulu.fi/~jlumme/initialsteps.pdf |
geographic |
Norway White Sea |
geographic_facet |
Norway White Sea |
genre |
karelia* karelian Salmo salar White Sea |
genre_facet |
karelia* karelian Salmo salar White Sea |
op_source |
http://cc.oulu.fi/~jlumme/initialsteps.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.1050 http://cc.oulu.fi/~jlumme/initialsteps.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766053018930774016 |