Alien species and propagules in the Antarctic : movements through space and time
Thesis (PhD (Botany and Zoology))--University of Stellenbosch, 2009. ENGLISH ABSTRACT: Although the impacts of biological invasions are widely appreciated, a bias exists in research effort to post‐dispersal processes because of the difficulties of measuring propagule pressure and the detecting of ne...
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ftunstellenbosch:oai:scholar.sun.ac.za:10019.1/4508 2023-11-12T04:08:38+01:00 Alien species and propagules in the Antarctic : movements through space and time Lee, Jennifer Elizabeth Chown, Steven L. University of Stellenbosch. Faculty of Science. Dept. of Botany and Zoology. 2010-08-13T14:44:21Z 171 p. : ill. application/pdf http://hdl.handle.net/10019.1/4508 en eng Stellenbosch : University of Stellenbosch http://hdl.handle.net/10019.1/4508 University of Stellenbosch Alien species -- Antarctica Dissertations -- Zoology Theses -- Zoology Non-indigenous species Biological invasions Thesis 2010 ftunstellenbosch 2023-10-22T07:39:33Z Thesis (PhD (Botany and Zoology))--University of Stellenbosch, 2009. ENGLISH ABSTRACT: Although the impacts of biological invasions are widely appreciated, a bias exists in research effort to post‐dispersal processes because of the difficulties of measuring propagule pressure and the detecting of newly established species. Here the Antarctic is used as a model system in which to quantify the initial dispersal of alien species and investigate the factors that contribute to the establishment and range dynamics of alien species once they have arrived in the region. Human movements are known to transport alien species into the Antarctic, some of which have successfully established and had wide ranging consequences in recipient ecosystems. Considering terrestrial flora, this research found that over 700 seeds from 99 taxa, including some species known to be invasive, are transported into the Antarctic each year in association with South African National Antarctic Programme (SANAP) passenger luggage and cargo. The first ever assessment of propagule drop‐off indicated that 30‐50% of these propagules will enter the recipient environment. Further results suggested that the construction of the British Antarctic Survey Halley VI station will facilitate the transport of over 5000 seeds from 34 taxa into the region, making this a significant pathway for introductions. Propagule pressure due to SANAP logistics is also considerable for marine species. Fouling assemblages on the external hull surfaces of the SANAP resupply vessel, the SA Agulhas, form only once the vessel’s anti‐fouling paint has been damaged by travel through sea ice and are characterised by low diversity. Ice scour prevents fouling assemblages from being transported to the Antarctic continent, but assemblages remain largely intact when travelling to sub‐Antarctic Islands. In the sea‐chests of the vessel populations of a known invasive, Mytilus galloprovincialis, were found with some individuals having survived transportation to the Antarctic region on ... Thesis Antarc* Antarctic Antarctica British Antarctic Survey Sea ice South African National Antarctic Programme Stellenbosch University: SUNScholar Research Repository Antarctic The Antarctic |
institution |
Open Polar |
collection |
Stellenbosch University: SUNScholar Research Repository |
op_collection_id |
ftunstellenbosch |
language |
English |
topic |
Alien species -- Antarctica Dissertations -- Zoology Theses -- Zoology Non-indigenous species Biological invasions |
spellingShingle |
Alien species -- Antarctica Dissertations -- Zoology Theses -- Zoology Non-indigenous species Biological invasions Lee, Jennifer Elizabeth Alien species and propagules in the Antarctic : movements through space and time |
topic_facet |
Alien species -- Antarctica Dissertations -- Zoology Theses -- Zoology Non-indigenous species Biological invasions |
description |
Thesis (PhD (Botany and Zoology))--University of Stellenbosch, 2009. ENGLISH ABSTRACT: Although the impacts of biological invasions are widely appreciated, a bias exists in research effort to post‐dispersal processes because of the difficulties of measuring propagule pressure and the detecting of newly established species. Here the Antarctic is used as a model system in which to quantify the initial dispersal of alien species and investigate the factors that contribute to the establishment and range dynamics of alien species once they have arrived in the region. Human movements are known to transport alien species into the Antarctic, some of which have successfully established and had wide ranging consequences in recipient ecosystems. Considering terrestrial flora, this research found that over 700 seeds from 99 taxa, including some species known to be invasive, are transported into the Antarctic each year in association with South African National Antarctic Programme (SANAP) passenger luggage and cargo. The first ever assessment of propagule drop‐off indicated that 30‐50% of these propagules will enter the recipient environment. Further results suggested that the construction of the British Antarctic Survey Halley VI station will facilitate the transport of over 5000 seeds from 34 taxa into the region, making this a significant pathway for introductions. Propagule pressure due to SANAP logistics is also considerable for marine species. Fouling assemblages on the external hull surfaces of the SANAP resupply vessel, the SA Agulhas, form only once the vessel’s anti‐fouling paint has been damaged by travel through sea ice and are characterised by low diversity. Ice scour prevents fouling assemblages from being transported to the Antarctic continent, but assemblages remain largely intact when travelling to sub‐Antarctic Islands. In the sea‐chests of the vessel populations of a known invasive, Mytilus galloprovincialis, were found with some individuals having survived transportation to the Antarctic region on ... |
author2 |
Chown, Steven L. University of Stellenbosch. Faculty of Science. Dept. of Botany and Zoology. |
format |
Thesis |
author |
Lee, Jennifer Elizabeth |
author_facet |
Lee, Jennifer Elizabeth |
author_sort |
Lee, Jennifer Elizabeth |
title |
Alien species and propagules in the Antarctic : movements through space and time |
title_short |
Alien species and propagules in the Antarctic : movements through space and time |
title_full |
Alien species and propagules in the Antarctic : movements through space and time |
title_fullStr |
Alien species and propagules in the Antarctic : movements through space and time |
title_full_unstemmed |
Alien species and propagules in the Antarctic : movements through space and time |
title_sort |
alien species and propagules in the antarctic : movements through space and time |
publisher |
Stellenbosch : University of Stellenbosch |
publishDate |
2010 |
url |
http://hdl.handle.net/10019.1/4508 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica British Antarctic Survey Sea ice South African National Antarctic Programme |
genre_facet |
Antarc* Antarctic Antarctica British Antarctic Survey Sea ice South African National Antarctic Programme |
op_relation |
http://hdl.handle.net/10019.1/4508 |
op_rights |
University of Stellenbosch |
_version_ |
1782328875312742400 |