Trans-Atlantic genetic uniformity in the rare snowbed sedge <Emphasis Type="Italic">Carex rufina</Emphasis> |
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Authors: | Kristine Bakke Westergaard Inger Greve Alsos Torstein Engelskjøn Kjell Ivar Flatberg Christian Brochmann |
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Affiliation: | 1.Troms? University Museum,University of Troms?,Troms?,Norway;2.National Centre for Biosystematics, Natural History Museum,University of Oslo,Blindern, Oslo,Norway;3.NTNU Museum of Natural History and Archaeology,Trondheim,Norway |
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Abstract: | The red-listed, amphi-Atlantic sedge Carex rufina is highly specialized to certain alpine snowbeds, and threatened by current changes in snow cover duration and moisture conditions.
Here we address its range-wide genetic diversity, history, and conservation using amplified fragment length polymorphisms
(AFLPs). Despite extensive primer testing, we detected very low overall diversity (4.1% polymorphic markers). Only a single
AFLP phenotype was found throughout Norway and across the Atlantic to Iceland and Greenland, while another was found in Canada,
suggesting glacial survival in one East and one West Atlantic refugium. East Atlantic C. rufina has probably been heavily bottlenecked in a small refugium, possibly situated within the maximum limits of the ice sheets.
Its lack of diversity is likely maintained through local clonal growth causing longevity of genotypes. Habitat availability
appears as the main limiting factor for C. rufina, and its currently occupied habitats need to be preserved to ensure its long-time survival. |
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