Evidence for hybridization and introgression in two Canadian Arctic louseworts: Pedicularis langsdorffii subsp. arctica and Pedicularis hirsuta.
Hybridization and introgression between two closely related but taxonomically distinct Arctic lousewort species – the circumpolar Pedicularis hirsuta (predominantly eastern Arctic in Canada) and the amphi-Beringian, western Canadian Pedicularis langsdorffii subsp. arctica – is documented here for th...
| Main Authors: | , , |
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| Format: | Article in Journal/Newspaper |
| Language: | unknown |
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NRC Research Press (a division of Canadian Science Publishing)
2016
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| Subjects: | |
| Online Access: | http://hdl.handle.net/1807/72416 http://www.nrcresearchpress.com/doi/abs/10.1139/cjb-2015-0264 |
| Summary: | Hybridization and introgression between two closely related but taxonomically distinct Arctic lousewort species – the circumpolar Pedicularis hirsuta (predominantly eastern Arctic in Canada) and the amphi-Beringian, western Canadian Pedicularis langsdorffii subsp. arctica – is documented here for the first time, only the second confirmed case of introgression in this widespread genus. Multivariate and univariate analysis of morphological characters successfully delineate the two species as morphologically similar but distinct taxa. Analysis of nrDNA ITS sequences likewise differentiate the two taxa in all sampled instances. Analysis of cpDNA atpI-atpH sequences also separate these taxa, except in 12 individuals of P. langsdorffii subsp. arctica, which possess the same haplotype as P. hirsuta. Where these two species overlap in range in the Canadian High Arctic, chloroplast transfer from P. hirsuta to P. langsdorffii subsp. arctica is detected, and morphologically intermediate hybids have been identified, indicating hybridisation and subsequent backcrossing. Here we discuss the relationships between these two species, and provide a key useful in differentiating them. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. |
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