Human activities, propagule pressure and alien plants in the sub-Antarctic: Tests of generalities and evidence in support of management
Despite concerns about the richness of plant invaders on islands, and their likely effects on local systems, impacts of these species seem to be small. However, this may be due to an absence of information on impacts, including changing species occupancy and forecast occupancy, rather than lack of i...
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ftunstellenbosch:oai:scholar.sun.ac.za:10019.1/117500 2023-05-15T13:57:33+02:00 Human activities, propagule pressure and alien plants in the sub-Antarctic: Tests of generalities and evidence in support of management le Roux, P.C. Ramaswiela, T. Kalwij, J.M. Shaw, J.D. Ryan, P.G. Treasure, A.M. McClelland, G.T.W. McGeoch, M.A. Chown, S.L. 2014-06-04T07:14:27Z 1416316 bytes application/pdf http://hdl.handle.net/10019.1/117500 en eng Elsevier Ltd. le Roux, P.C., Ramaswiela, T., Kalwij, J.M., Shaw, J.D., Ryan, P.G., Treasure, A.M., McClelland, G.T.W., McGeoch, M.A. and Chown, S.L. (2013). Human activities, propagule pressure and alien plants in the sub-Antarctic: tests of generalities and evidence in support of management. Biological Conservation 161, 18-27. http://hdl.handle.net/10019.1/117500 Antarctic Environmental change Invasive alien species Propagule pressure Residence time JournalArticles 2014 ftunstellenbosch 2022-01-25T01:15:49Z Despite concerns about the richness of plant invaders on islands, and their likely effects on local systems, impacts of these species seem to be small. However, this may be due to an absence of information on impacts, including changing species occupancy and forecast occupancy, rather than lack of impact per se. Here we use the plant invaders on the sub-Antarctic Prince Edward Islands (PEIs) and spatially explicit modeling of presence–absence survey data to demonstrate that the geographic extent of many invasives is increasing and is forecast to lead to occupancy of >60% of the islands’ surface area by 2060, with ongoing climate change. In keeping with theory, proximity to human activity, neighboring populations (i.e. propagule pressure) and residence time, along with more minor contributors such as elevation, explain >50% of the variation in the occupancy of each of the six main invasive species on the islands. Human disturbance and changing climates seem to have led to recent increases in the rate of range expansion. Our results suggest that impacts of island plant invaders may be more significant than previously estimated, largely owing to prior data deficiency. More specifically they also suggest that control plans for the PEI (and other Southern Ocean Islands, SOIS) should first target less widely distributed species, which are invasive elsewhere. They also indicate that for the other SOIS, and for Antarctica, surveillance and anticipatory control plans should be in place. Other/Unknown Material Antarc* Antarctic Antarctica Prince Edward Islands Southern Ocean Stellenbosch University: SUNScholar Research Repository Antarctic Southern Ocean |
institution |
Open Polar |
collection |
Stellenbosch University: SUNScholar Research Repository |
op_collection_id |
ftunstellenbosch |
language |
English |
topic |
Antarctic Environmental change Invasive alien species Propagule pressure Residence time |
spellingShingle |
Antarctic Environmental change Invasive alien species Propagule pressure Residence time le Roux, P.C. Ramaswiela, T. Kalwij, J.M. Shaw, J.D. Ryan, P.G. Treasure, A.M. McClelland, G.T.W. McGeoch, M.A. Chown, S.L. Human activities, propagule pressure and alien plants in the sub-Antarctic: Tests of generalities and evidence in support of management |
topic_facet |
Antarctic Environmental change Invasive alien species Propagule pressure Residence time |
description |
Despite concerns about the richness of plant invaders on islands, and their likely effects on local systems, impacts of these species seem to be small. However, this may be due to an absence of information on impacts, including changing species occupancy and forecast occupancy, rather than lack of impact per se. Here we use the plant invaders on the sub-Antarctic Prince Edward Islands (PEIs) and spatially explicit modeling of presence–absence survey data to demonstrate that the geographic extent of many invasives is increasing and is forecast to lead to occupancy of >60% of the islands’ surface area by 2060, with ongoing climate change. In keeping with theory, proximity to human activity, neighboring populations (i.e. propagule pressure) and residence time, along with more minor contributors such as elevation, explain >50% of the variation in the occupancy of each of the six main invasive species on the islands. Human disturbance and changing climates seem to have led to recent increases in the rate of range expansion. Our results suggest that impacts of island plant invaders may be more significant than previously estimated, largely owing to prior data deficiency. More specifically they also suggest that control plans for the PEI (and other Southern Ocean Islands, SOIS) should first target less widely distributed species, which are invasive elsewhere. They also indicate that for the other SOIS, and for Antarctica, surveillance and anticipatory control plans should be in place. |
format |
Other/Unknown Material |
author |
le Roux, P.C. Ramaswiela, T. Kalwij, J.M. Shaw, J.D. Ryan, P.G. Treasure, A.M. McClelland, G.T.W. McGeoch, M.A. Chown, S.L. |
author_facet |
le Roux, P.C. Ramaswiela, T. Kalwij, J.M. Shaw, J.D. Ryan, P.G. Treasure, A.M. McClelland, G.T.W. McGeoch, M.A. Chown, S.L. |
author_sort |
le Roux, P.C. |
title |
Human activities, propagule pressure and alien plants in the sub-Antarctic: Tests of generalities and evidence in support of management |
title_short |
Human activities, propagule pressure and alien plants in the sub-Antarctic: Tests of generalities and evidence in support of management |
title_full |
Human activities, propagule pressure and alien plants in the sub-Antarctic: Tests of generalities and evidence in support of management |
title_fullStr |
Human activities, propagule pressure and alien plants in the sub-Antarctic: Tests of generalities and evidence in support of management |
title_full_unstemmed |
Human activities, propagule pressure and alien plants in the sub-Antarctic: Tests of generalities and evidence in support of management |
title_sort |
human activities, propagule pressure and alien plants in the sub-antarctic: tests of generalities and evidence in support of management |
publisher |
Elsevier Ltd. |
publishDate |
2014 |
url |
http://hdl.handle.net/10019.1/117500 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctica Prince Edward Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Prince Edward Islands Southern Ocean |
op_relation |
le Roux, P.C., Ramaswiela, T., Kalwij, J.M., Shaw, J.D., Ryan, P.G., Treasure, A.M., McClelland, G.T.W., McGeoch, M.A. and Chown, S.L. (2013). Human activities, propagule pressure and alien plants in the sub-Antarctic: tests of generalities and evidence in support of management. Biological Conservation 161, 18-27. http://hdl.handle.net/10019.1/117500 |
_version_ |
1766265220872798208 |