Population structure, propagule pressure, and conservation biogeography in the sub-Antarctic: Lessons from indigenous and invasive springtails: Biodiversity research
The patterns in and the processes underlying the distribution of invertebrates among Southern Ocean islands and across vegetation types on these islands are reasonably well understood. However, few studies have examined the extent to which populations are genetically structured. Given that many sub-...
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ftunstellenbosch:oai:scholar.sun.ac.za:10019.1/12043 2023-11-12T04:06:54+01:00 Population structure, propagule pressure, and conservation biogeography in the sub-Antarctic: Lessons from indigenous and invasive springtails: Biodiversity research Myburgh M. Chown S.L. Daniels S.R. Van Vuuren B.J. 2007 http://hdl.handle.net/10019.1/12043 https://doi.org/10.1111/j.1472-4642.2007.00319.x unknown Diversity and Distributions 13 2 13669516 doi:10.1111/j.1472-4642.2007.00319.x http://hdl.handle.net/10019.1/12043 biodiversity biogeography insect invasive species native species population structure propagule subantarctic region Indian Ocean Indian Ocean islands Marion Island Prince Edward Islands Animalia Arthropoda Ceratophysella denticulata Collembola Cryptopygus antarcticus Invertebrata Isotomurus Tullbergia Article 2007 ftunstellenbosch https://doi.org/10.1111/j.1472-4642.2007.00319.x 2023-10-22T07:20:00Z The patterns in and the processes underlying the distribution of invertebrates among Southern Ocean islands and across vegetation types on these islands are reasonably well understood. However, few studies have examined the extent to which populations are genetically structured. Given that many sub-Antarctic islands experienced major glaciation and volcanic activity, it might be predicted that substantial population substructure and little genetic isolation-by-distance should characterize indigenous species. By contrast, substantially less population structure might be expected for introduced species. Here, we examine these predictions and their consequences for the conservation of diversity in the region. We do so by examining haplotype diversity based on mitochondrial cytochrome c oxidase subunit I sequence data, from two indigenous (Cryptopygus antarcticus travei, Tullbergia bisetosa) and two introduced (Isotomurus cf. palustris, Ceratophysella denticulata) springtail species from Marion Island. We find considerable genetic substructure in the indigenous species that is compatible with the geological and glacialogical history of the island. Moreover, by employing ecological techniques, we show that haplotype diversity is likely much higher than our sequenced samples suggest. No structure is found in the introduced species, with each being represented by a single haplotype only. This indicates that propagule pressure is not significant for these small animals unlike the situation for other, larger invasive species: a few individuals introduced once are likely to have initiated the invasion. These outcomes demonstrate that sampling must be more comprehensive if the population history of indigenous arthropods on these islands is to be comprehended, and that the risks of within- and among-island introductions are substantial. The latter means that, if biogeographical signal is to be retained in the region, great care must be taken to avoid inadvertent movement of indigenous species among and within islands. Thus, ... Article in Journal/Newspaper Antarc* Antarctic antarcticus Cryptopygus antarcticus Marion Island Prince Edward Islands Southern Ocean Springtail Stellenbosch University: SUNScholar Research Repository Antarctic Indian Southern Ocean Diversity and Distributions 13 2 143 154 |
institution |
Open Polar |
collection |
Stellenbosch University: SUNScholar Research Repository |
op_collection_id |
ftunstellenbosch |
language |
unknown |
topic |
biodiversity biogeography insect invasive species native species population structure propagule subantarctic region Indian Ocean Indian Ocean islands Marion Island Prince Edward Islands Animalia Arthropoda Ceratophysella denticulata Collembola Cryptopygus antarcticus Invertebrata Isotomurus Tullbergia |
spellingShingle |
biodiversity biogeography insect invasive species native species population structure propagule subantarctic region Indian Ocean Indian Ocean islands Marion Island Prince Edward Islands Animalia Arthropoda Ceratophysella denticulata Collembola Cryptopygus antarcticus Invertebrata Isotomurus Tullbergia Myburgh M. Chown S.L. Daniels S.R. Van Vuuren B.J. Population structure, propagule pressure, and conservation biogeography in the sub-Antarctic: Lessons from indigenous and invasive springtails: Biodiversity research |
topic_facet |
biodiversity biogeography insect invasive species native species population structure propagule subantarctic region Indian Ocean Indian Ocean islands Marion Island Prince Edward Islands Animalia Arthropoda Ceratophysella denticulata Collembola Cryptopygus antarcticus Invertebrata Isotomurus Tullbergia |
description |
The patterns in and the processes underlying the distribution of invertebrates among Southern Ocean islands and across vegetation types on these islands are reasonably well understood. However, few studies have examined the extent to which populations are genetically structured. Given that many sub-Antarctic islands experienced major glaciation and volcanic activity, it might be predicted that substantial population substructure and little genetic isolation-by-distance should characterize indigenous species. By contrast, substantially less population structure might be expected for introduced species. Here, we examine these predictions and their consequences for the conservation of diversity in the region. We do so by examining haplotype diversity based on mitochondrial cytochrome c oxidase subunit I sequence data, from two indigenous (Cryptopygus antarcticus travei, Tullbergia bisetosa) and two introduced (Isotomurus cf. palustris, Ceratophysella denticulata) springtail species from Marion Island. We find considerable genetic substructure in the indigenous species that is compatible with the geological and glacialogical history of the island. Moreover, by employing ecological techniques, we show that haplotype diversity is likely much higher than our sequenced samples suggest. No structure is found in the introduced species, with each being represented by a single haplotype only. This indicates that propagule pressure is not significant for these small animals unlike the situation for other, larger invasive species: a few individuals introduced once are likely to have initiated the invasion. These outcomes demonstrate that sampling must be more comprehensive if the population history of indigenous arthropods on these islands is to be comprehended, and that the risks of within- and among-island introductions are substantial. The latter means that, if biogeographical signal is to be retained in the region, great care must be taken to avoid inadvertent movement of indigenous species among and within islands. Thus, ... |
format |
Article in Journal/Newspaper |
author |
Myburgh M. Chown S.L. Daniels S.R. Van Vuuren B.J. |
author_facet |
Myburgh M. Chown S.L. Daniels S.R. Van Vuuren B.J. |
author_sort |
Myburgh M. |
title |
Population structure, propagule pressure, and conservation biogeography in the sub-Antarctic: Lessons from indigenous and invasive springtails: Biodiversity research |
title_short |
Population structure, propagule pressure, and conservation biogeography in the sub-Antarctic: Lessons from indigenous and invasive springtails: Biodiversity research |
title_full |
Population structure, propagule pressure, and conservation biogeography in the sub-Antarctic: Lessons from indigenous and invasive springtails: Biodiversity research |
title_fullStr |
Population structure, propagule pressure, and conservation biogeography in the sub-Antarctic: Lessons from indigenous and invasive springtails: Biodiversity research |
title_full_unstemmed |
Population structure, propagule pressure, and conservation biogeography in the sub-Antarctic: Lessons from indigenous and invasive springtails: Biodiversity research |
title_sort |
population structure, propagule pressure, and conservation biogeography in the sub-antarctic: lessons from indigenous and invasive springtails: biodiversity research |
publishDate |
2007 |
url |
http://hdl.handle.net/10019.1/12043 https://doi.org/10.1111/j.1472-4642.2007.00319.x |
geographic |
Antarctic Indian Southern Ocean |
geographic_facet |
Antarctic Indian Southern Ocean |
genre |
Antarc* Antarctic antarcticus Cryptopygus antarcticus Marion Island Prince Edward Islands Southern Ocean Springtail |
genre_facet |
Antarc* Antarctic antarcticus Cryptopygus antarcticus Marion Island Prince Edward Islands Southern Ocean Springtail |
op_relation |
Diversity and Distributions 13 2 13669516 doi:10.1111/j.1472-4642.2007.00319.x http://hdl.handle.net/10019.1/12043 |
op_doi |
https://doi.org/10.1111/j.1472-4642.2007.00319.x |
container_title |
Diversity and Distributions |
container_volume |
13 |
container_issue |
2 |
container_start_page |
143 |
op_container_end_page |
154 |
_version_ |
1782327821678411776 |