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Genetic diversity in the rare orchid Gymnadenia odoratissima and a comparison with the more common congener, G. conopsea

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Abstract

Patterns and levels of genetic diversity mayhave significant influence on the long termpersistence of local populations and revealingsuch information is important in protectingrare species. In this study we investigated thegenetic pattern in five microsatellite lociwithin five Swedish populations of the rareorchid species Gymnadenia odoratissima. Thegeographic distribution of G. odoratissima isrestricted to Europe and in Scandinavia it isonly found in three provinces in southernSweden; Östergötland,Västergötland and on the island ofGotland.Compared with the more widespread congener G.conopsea our results indicate lower levels ofgenetic variation within and higher degrees ofgenetic differentiation among populations ofG. odoratissima (HEL = 0.6–0.8 in G. conopseaand 0.3–0.7 in G. odoratissima; FST over allpopulations = 0.06 in G. conopsea and 0.19 inG. odoratissima). Also, we found a cleardistinction among mainland and islandpopulations of G. odoratissima wherepopulations on the island of Gotland seem toexhibit higher levels of gene flow andintragenetic variation, probably as a result ofa larger number of existing populations.Future conservation of this species shouldfocus on facilitation on colonisation events,especially on the mainland, and preservation ofthe genetically more variable Gotlandpopulations.

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Gustafsson, S., Sjögren-Gulve, P. Genetic diversity in the rare orchid Gymnadenia odoratissima and a comparison with the more common congener, G. conopsea . Conservation Genetics 3, 225–234 (2002). https://doi.org/10.1023/A:1019969014333

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