Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos
Biological invasions in remote areas that experience low human activity provide unique opportunities to elucidate processes responsible for invasion success. Here we study the most widespread invasive plant species across the isolated islands of the Southern Ocean, the annual bluegrass, Poa annua. T...
Published in: | Molecular Ecology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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John Wiley & Sons
2023
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Online Access: | http://hdl.handle.net/10261/338394 https://doi.org/10.1111/mec.16809 https://doi.org/10.13039/501100001322 https://doi.org/10.13039/501100004914 https://api.elsevier.com/content/abstract/scopus_id/85144117779 |
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ftcsic:oai:digital.csic.es:10261/338394 2024-06-23T07:47:40+00:00 Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos Mairal, Mario García-Verdugo, Carlos Le Roux, Johannes J Chau, John H. Vuuren, Bettine Jansen van Hui, Cang Münzbergová, Zuzana Chown, Steven L. Shaw, Justine D. Swiss Polar Institute Ferring Pharmaceuticals Antarctic Circumnavigation Expedition South African Medical Research Council South African National Antarctic Programme Mairal, Mario Chau, John H. Vuuren, Bettine Jansen van 2023-02 application/pdf http://hdl.handle.net/10261/338394 https://doi.org/10.1111/mec.16809 https://doi.org/10.13039/501100001322 https://doi.org/10.13039/501100004914 https://api.elsevier.com/content/abstract/scopus_id/85144117779 en eng John Wiley & Sons Publisher's version The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1111/mec.16809 https://doi.org/10.1111/mec.16809 Sí Molecular Ecology 32(4): 756-771 (2023) 0962-1083 http://hdl.handle.net/10261/338394 doi:10.1111/mec.16809 1365-294X http://dx.doi.org/10.13039/501100001322 http://dx.doi.org/10.13039/501100004914 36478264 2-s2.0-85144117779 https://api.elsevier.com/content/abstract/scopus_id/85144117779 open Poa annua Biological invasions Breeding systems Clonality Genetic variation Islands Polyploidy Population genetics Self-fertilization Sub-Antarctic artículo http://purl.org/coar/resource_type/c_6501 2023 ftcsic https://doi.org/10.1111/mec.1680910.13039/50110000132210.13039/501100004914 2024-05-29T00:05:22Z Biological invasions in remote areas that experience low human activity provide unique opportunities to elucidate processes responsible for invasion success. Here we study the most widespread invasive plant species across the isolated islands of the Southern Ocean, the annual bluegrass, Poa annua. To analyse geographical variation in genome size, genetic diversity and reproductive strategies, we sampled all major sub-Antarctic archipelagos in this region and generated microsatellite data for 470 individual plants representing 31 populations. We also estimated genome sizes for a subset of individuals using flow cytometry. Occasional events of island colonization are expected to result in high genetic structure among islands, overall low genetic diversity and increased self-fertilization, but we show that this is not the case for P. annua. Microsatellite data indicated low population genetic structure and lack of isolation by distance among the sub-Antarctic archipelagos we sampled, but high population structure within each archipelago. We identified high levels of genetic diversity, low clonality and low selfing rates in sub-Antarctic P. annua populations (contrary to rates typical of continental populations). In turn, estimates of selfing declined in populations as genetic diversity increased. Additionally, we found that most P. annua individuals are probably tetraploid and that only slight variation exists in genome size across the Southern Ocean. Our findings suggest multiple independent introductions of P. annua into the sub-Antarctic, which promoted the establishment of genetically diverse populations. Despite multiple introductions, the adoption of convergent reproductive strategies (outcrossing) happened independently in each major archipelago. The combination of polyploidy and a mixed reproductive strategy probably benefited P. annua in the Southern Ocean by increasing genetic diversity and its ability to cope with the novel environmental conditions. This work received support from the Swiss Polar ... Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic Southern Ocean Molecular Ecology 32 4 756 771 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Poa annua Biological invasions Breeding systems Clonality Genetic variation Islands Polyploidy Population genetics Self-fertilization Sub-Antarctic |
spellingShingle |
Poa annua Biological invasions Breeding systems Clonality Genetic variation Islands Polyploidy Population genetics Self-fertilization Sub-Antarctic Mairal, Mario García-Verdugo, Carlos Le Roux, Johannes J Chau, John H. Vuuren, Bettine Jansen van Hui, Cang Münzbergová, Zuzana Chown, Steven L. Shaw, Justine D. Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos |
topic_facet |
Poa annua Biological invasions Breeding systems Clonality Genetic variation Islands Polyploidy Population genetics Self-fertilization Sub-Antarctic |
description |
Biological invasions in remote areas that experience low human activity provide unique opportunities to elucidate processes responsible for invasion success. Here we study the most widespread invasive plant species across the isolated islands of the Southern Ocean, the annual bluegrass, Poa annua. To analyse geographical variation in genome size, genetic diversity and reproductive strategies, we sampled all major sub-Antarctic archipelagos in this region and generated microsatellite data for 470 individual plants representing 31 populations. We also estimated genome sizes for a subset of individuals using flow cytometry. Occasional events of island colonization are expected to result in high genetic structure among islands, overall low genetic diversity and increased self-fertilization, but we show that this is not the case for P. annua. Microsatellite data indicated low population genetic structure and lack of isolation by distance among the sub-Antarctic archipelagos we sampled, but high population structure within each archipelago. We identified high levels of genetic diversity, low clonality and low selfing rates in sub-Antarctic P. annua populations (contrary to rates typical of continental populations). In turn, estimates of selfing declined in populations as genetic diversity increased. Additionally, we found that most P. annua individuals are probably tetraploid and that only slight variation exists in genome size across the Southern Ocean. Our findings suggest multiple independent introductions of P. annua into the sub-Antarctic, which promoted the establishment of genetically diverse populations. Despite multiple introductions, the adoption of convergent reproductive strategies (outcrossing) happened independently in each major archipelago. The combination of polyploidy and a mixed reproductive strategy probably benefited P. annua in the Southern Ocean by increasing genetic diversity and its ability to cope with the novel environmental conditions. This work received support from the Swiss Polar ... |
author2 |
Swiss Polar Institute Ferring Pharmaceuticals Antarctic Circumnavigation Expedition South African Medical Research Council South African National Antarctic Programme Mairal, Mario Chau, John H. Vuuren, Bettine Jansen van |
format |
Article in Journal/Newspaper |
author |
Mairal, Mario García-Verdugo, Carlos Le Roux, Johannes J Chau, John H. Vuuren, Bettine Jansen van Hui, Cang Münzbergová, Zuzana Chown, Steven L. Shaw, Justine D. |
author_facet |
Mairal, Mario García-Verdugo, Carlos Le Roux, Johannes J Chau, John H. Vuuren, Bettine Jansen van Hui, Cang Münzbergová, Zuzana Chown, Steven L. Shaw, Justine D. |
author_sort |
Mairal, Mario |
title |
Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos |
title_short |
Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos |
title_full |
Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos |
title_fullStr |
Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos |
title_full_unstemmed |
Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos |
title_sort |
multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across southern ocean archipelagos |
publisher |
John Wiley & Sons |
publishDate |
2023 |
url |
http://hdl.handle.net/10261/338394 https://doi.org/10.1111/mec.16809 https://doi.org/10.13039/501100001322 https://doi.org/10.13039/501100004914 https://api.elsevier.com/content/abstract/scopus_id/85144117779 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
Publisher's version The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1111/mec.16809 https://doi.org/10.1111/mec.16809 Sí Molecular Ecology 32(4): 756-771 (2023) 0962-1083 http://hdl.handle.net/10261/338394 doi:10.1111/mec.16809 1365-294X http://dx.doi.org/10.13039/501100001322 http://dx.doi.org/10.13039/501100004914 36478264 2-s2.0-85144117779 https://api.elsevier.com/content/abstract/scopus_id/85144117779 |
op_rights |
open |
op_doi |
https://doi.org/10.1111/mec.1680910.13039/50110000132210.13039/501100004914 |
container_title |
Molecular Ecology |
container_volume |
32 |
container_issue |
4 |
container_start_page |
756 |
op_container_end_page |
771 |
_version_ |
1802651814348193792 |