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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2023
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ftqueensland:oai:eprints.qut.edu.au:243655 2024-05-19T07:31:10+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 Garcia-Verdugo, Carlos Le Roux, Johannes J. Chau, John H. van Vuuren, Bettine Jansen Hui, Cang Münzbergová, Zuzana Chown, Steven L. Shaw, Justine D. 2023-02 https://eprints.qut.edu.au/243655/ unknown Wiley-Blackwell Publishing Ltd doi:10.1111/mec.16809 Mairal, Mario, Garcia-Verdugo, Carlos, Le Roux, Johannes J., Chau, John H., van Vuuren, Bettine Jansen, Hui, Cang, Münzbergová, Zuzana, Chown, Steven L., & Shaw, Justine D. (2023) Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos. Molecular Ecology, 32(4), pp. 756-771. https://eprints.qut.edu.au/243655/ Faculty of Science; School of Biology & Environmental Science 2022 The Authors This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au Molecular Ecology biological invasions breeding systems clonality genetic variation islands Poa annua polyploidy population genetics self-fertilization sub-Antarctic Contribution to Journal 2023 ftqueensland https://doi.org/10.1111/mec.16809 2024-04-24T00:09:08Z 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. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Queensland University of Technology: QUT ePrints Molecular Ecology 32 4 756 771 |
institution |
Open Polar |
collection |
Queensland University of Technology: QUT ePrints |
op_collection_id |
ftqueensland |
language |
unknown |
topic |
biological invasions breeding systems clonality genetic variation islands Poa annua polyploidy population genetics self-fertilization sub-Antarctic |
spellingShingle |
biological invasions breeding systems clonality genetic variation islands Poa annua polyploidy population genetics self-fertilization sub-Antarctic Mairal, Mario Garcia-Verdugo, Carlos Le Roux, Johannes J. Chau, John H. van Vuuren, Bettine Jansen 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 |
biological invasions breeding systems clonality genetic variation islands Poa annua 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. |
format |
Article in Journal/Newspaper |
author |
Mairal, Mario Garcia-Verdugo, Carlos Le Roux, Johannes J. Chau, John H. van Vuuren, Bettine Jansen Hui, Cang Münzbergová, Zuzana Chown, Steven L. Shaw, Justine D. |
author_facet |
Mairal, Mario Garcia-Verdugo, Carlos Le Roux, Johannes J. Chau, John H. van Vuuren, Bettine Jansen 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 |
Wiley-Blackwell Publishing Ltd |
publishDate |
2023 |
url |
https://eprints.qut.edu.au/243655/ |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Molecular Ecology |
op_relation |
doi:10.1111/mec.16809 Mairal, Mario, Garcia-Verdugo, Carlos, Le Roux, Johannes J., Chau, John H., van Vuuren, Bettine Jansen, Hui, Cang, Münzbergová, Zuzana, Chown, Steven L., & Shaw, Justine D. (2023) Multiple introductions, polyploidy and mixed reproductive strategies are linked to genetic diversity and structure in the most widespread invasive plant across Southern Ocean archipelagos. Molecular Ecology, 32(4), pp. 756-771. https://eprints.qut.edu.au/243655/ Faculty of Science; School of Biology & Environmental Science |
op_rights |
2022 The Authors This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
op_doi |
https://doi.org/10.1111/mec.16809 |
container_title |
Molecular Ecology |
container_volume |
32 |
container_issue |
4 |
container_start_page |
756 |
op_container_end_page |
771 |
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1799469011934642176 |