Orchid colonization: multiple parallel dispersal events and mosaic genetic structure in Dactylorhiza majalis ssp. lapponica on the Baltic island of Gotland.
Background and AimsThe island of Gotland in the Baltic Sea has had no contact with surrounding continental areas since the withdrawal of the Weichselian ice sheet at approx. 17 ka BP. Plants present on Gotland must have arrived by long-distance dispersal, so populations are expected to exhibit reduc...
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ftulundlup:oai:lup.lub.lu.se:f6b0fc53-d71c-424e-a65e-d6a66cf4e2f4 2023-06-11T04:12:52+02:00 Orchid colonization: multiple parallel dispersal events and mosaic genetic structure in Dactylorhiza majalis ssp. lapponica on the Baltic island of Gotland. Hedrén, Mikael Nordström Olofsson, Sofie Paun, Ovidiu 2018-06-28 https://lup.lub.lu.se/record/f6b0fc53-d71c-424e-a65e-d6a66cf4e2f4 https://doi.org/10.1093/aob/mcy111 eng eng Oxford University Press https://lup.lub.lu.se/record/f6b0fc53-d71c-424e-a65e-d6a66cf4e2f4 http://dx.doi.org/10.1093/aob/mcy111 scopus:85070860936 Annals of Botany; 122(6), pp 1019-1031 (2018) ISSN: 0305-7364 Botany Genetics Ecology contributiontojournal/article info:eu-repo/semantics/article text 2018 ftulundlup https://doi.org/10.1093/aob/mcy111 2023-05-03T22:27:33Z Background and AimsThe island of Gotland in the Baltic Sea has had no contact with surrounding continental areas since the withdrawal of the Weichselian ice sheet at approx. 17 ka BP. Plants present on Gotland must have arrived by long-distance dispersal, so populations are expected to exhibit reduced levels of genetic diversity compared with populations on surrounding mainlands. However, orchids have very small seeds, which appear well adapted to long-distance dispersal, and they should therefore be less affected than other plant species by colonization bottlenecks. The aim of this study was to analyse the genetic structure of orchids colonizing isolated islands, using the marsh orchid Dactylorhiza majalis ssp. lapponica as a case study.MethodsMore than 500 samples from 27 populations were analysed for 15 plastid and eight nuclear marker loci. Population diversity and differentiation patterns were compared for nuclear and plastid marker systems and analysed in relation to geographical location.Key ResultsWe found high genetic diversity but no clear geographical structure of genetic differentiation between populations on Gotland. However, the between-population differentiation in plastid and nuclear markers were correlated and the greatest diversity was found at sites at comparatively high elevations, which were the first to emerge above the water after the Ice Age.ConclusionsThe regional population on Gotland has been established by a minimum of four dispersal events from continental regions. Subsequent gene flow between sites has not yet homogenized the differentiation pattern originating from initial colonization. We conclude that long-distance seed dispersal in orchids has a strong impact on structuring genetic diversity during periods of expansion and colonization, but contributes less to gene flow between populations once a stable population structure has been achieved. Article in Journal/Newspaper Ice Sheet Lund University Publications (LUP) Annals of Botany |
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Open Polar |
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Lund University Publications (LUP) |
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ftulundlup |
language |
English |
topic |
Botany Genetics Ecology |
spellingShingle |
Botany Genetics Ecology Hedrén, Mikael Nordström Olofsson, Sofie Paun, Ovidiu Orchid colonization: multiple parallel dispersal events and mosaic genetic structure in Dactylorhiza majalis ssp. lapponica on the Baltic island of Gotland. |
topic_facet |
Botany Genetics Ecology |
description |
Background and AimsThe island of Gotland in the Baltic Sea has had no contact with surrounding continental areas since the withdrawal of the Weichselian ice sheet at approx. 17 ka BP. Plants present on Gotland must have arrived by long-distance dispersal, so populations are expected to exhibit reduced levels of genetic diversity compared with populations on surrounding mainlands. However, orchids have very small seeds, which appear well adapted to long-distance dispersal, and they should therefore be less affected than other plant species by colonization bottlenecks. The aim of this study was to analyse the genetic structure of orchids colonizing isolated islands, using the marsh orchid Dactylorhiza majalis ssp. lapponica as a case study.MethodsMore than 500 samples from 27 populations were analysed for 15 plastid and eight nuclear marker loci. Population diversity and differentiation patterns were compared for nuclear and plastid marker systems and analysed in relation to geographical location.Key ResultsWe found high genetic diversity but no clear geographical structure of genetic differentiation between populations on Gotland. However, the between-population differentiation in plastid and nuclear markers were correlated and the greatest diversity was found at sites at comparatively high elevations, which were the first to emerge above the water after the Ice Age.ConclusionsThe regional population on Gotland has been established by a minimum of four dispersal events from continental regions. Subsequent gene flow between sites has not yet homogenized the differentiation pattern originating from initial colonization. We conclude that long-distance seed dispersal in orchids has a strong impact on structuring genetic diversity during periods of expansion and colonization, but contributes less to gene flow between populations once a stable population structure has been achieved. |
format |
Article in Journal/Newspaper |
author |
Hedrén, Mikael Nordström Olofsson, Sofie Paun, Ovidiu |
author_facet |
Hedrén, Mikael Nordström Olofsson, Sofie Paun, Ovidiu |
author_sort |
Hedrén, Mikael |
title |
Orchid colonization: multiple parallel dispersal events and mosaic genetic structure in Dactylorhiza majalis ssp. lapponica on the Baltic island of Gotland. |
title_short |
Orchid colonization: multiple parallel dispersal events and mosaic genetic structure in Dactylorhiza majalis ssp. lapponica on the Baltic island of Gotland. |
title_full |
Orchid colonization: multiple parallel dispersal events and mosaic genetic structure in Dactylorhiza majalis ssp. lapponica on the Baltic island of Gotland. |
title_fullStr |
Orchid colonization: multiple parallel dispersal events and mosaic genetic structure in Dactylorhiza majalis ssp. lapponica on the Baltic island of Gotland. |
title_full_unstemmed |
Orchid colonization: multiple parallel dispersal events and mosaic genetic structure in Dactylorhiza majalis ssp. lapponica on the Baltic island of Gotland. |
title_sort |
orchid colonization: multiple parallel dispersal events and mosaic genetic structure in dactylorhiza majalis ssp. lapponica on the baltic island of gotland. |
publisher |
Oxford University Press |
publishDate |
2018 |
url |
https://lup.lub.lu.se/record/f6b0fc53-d71c-424e-a65e-d6a66cf4e2f4 https://doi.org/10.1093/aob/mcy111 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Annals of Botany; 122(6), pp 1019-1031 (2018) ISSN: 0305-7364 |
op_relation |
https://lup.lub.lu.se/record/f6b0fc53-d71c-424e-a65e-d6a66cf4e2f4 http://dx.doi.org/10.1093/aob/mcy111 scopus:85070860936 |
op_doi |
https://doi.org/10.1093/aob/mcy111 |
container_title |
Annals of Botany |
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1768389003970609152 |