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Understanding current and potential distribution of Australian acacia species in southern Africa
Dissertation (MSc)--University of Pretoria, 2014.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2021
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| _version_ | 1867613675928420352 |
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| access_status_str | Open Access |
| author2 | Robertson, Mark P. |
| author_browse | Robertson, Mark P. |
| author_facet | Robertson, Mark P. |
| collection | Thesis |
| dc_rights_str_mv | © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 2014. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/79720 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:55.528Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/79720 Understanding current and potential distribution of Australian acacia species in southern Africa Robertson, Mark P. mrobertson@zoology.up.ac.za Rouget, M. Wilson, John R.U. Motloung, Rethabile Frangenie Species distribution models Southern African Plant Invaders Atlas Forestry Classification tree Expert knowledge Field visits Alien tree UCTD Dissertation (MSc)--University of Pretoria, 2014. This dissertation presents research on the value of using different sources of data to explore the factors determining invasiveness of introduced species. The research draws upon the availability of data on the historical trial plantings of alien species and other sources. The focus of the study is on Australian Acacia species as a taxon introduced into southern Africa (Lesotho, South Africa and Swaziland). The first component of the study focused on understanding the factors determining introduction outcome of species in historical trial plantings and invasion success of Australian Acacia species using Species Distribution Models (SDMs) and classification tree techniques. SDMs were calibrated using the native range occurrence records (Australia) and were validated using results of 150 years of South African government forestry trial planting records and invaded range data from the Southern African Plant Invaders Atlas. To understand factors associated with survival (‘trial success’) or failure to survive (‘trial failure’) of species in historical trial plantings, classification and regression tree analysis was used. The results indicate climate as one of the factors that explains introduction and/or invasion success of Australian Acacia species in southern Africa. However, the results also indicate that for ‘trial failures’ there are factors other than climate that could have influenced the trial outcome. This study emphasizes the need to integrate data on whether the species has been recorded to be invasive elsewhere with climate matching for invasion risk assessment. The second component of the study focused on understanding the distribution patterns of Australian Acacia species that are not known as invasive in southern Africa. The specific aims were to determine which species still exist at previously recorded sites and determine the current invasion status. This was done by collating data from different sources that list species introduced into southern Africa and then conducting revisits. For the purpose of this study, revisits means conducting field surveys based on recorded occurrences of introduced species. The known occurrence data for species on the list were obtained from different data sources and various invasion biology experts. As it was not practical to do revisits for all species on the list, three ornamental species (Acacia floribunda, A. pendula and A. retinodes) were selected as part of the pilot study for the conducted revisits in this study. Acacia retinodes trees were not found during the revisits. The results provided data that could be used to characterize species based on the Blackburn et al., (2011) scheme. However, it is not clear whether observed Acacia pendula or A. floribunda trees will spread away from the sites hence the need to continuously monitor sites for spread. The methods used in this research establish a protocol for future work on conducting revisits at known localities of introduced species to determine their population dynamics and thereby characterize the species according to the scheme for management purposes. National Research Foundation (NRF) Zoology and Entomology MSc (Zoology) Unrestricted 2021-04-30T13:21:19Z 2021-04-30T13:21:19Z 2014 2014-06 Dissertation Motloung, RF 2014, Understanding current and potential distribution of Australian acacia species in southern Africa, MSc (Zoology) Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/79720> M14/9/189 http://hdl.handle.net/2263/79720 en © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Species distribution models Southern African Plant Invaders Atlas Forestry Classification tree Expert knowledge Field visits Alien tree UCTD Understanding current and potential distribution of Australian acacia species in southern Africa |
| title | Understanding current and potential distribution of Australian acacia species in southern Africa |
| title_full | Understanding current and potential distribution of Australian acacia species in southern Africa |
| title_fullStr | Understanding current and potential distribution of Australian acacia species in southern Africa |
| title_full_unstemmed | Understanding current and potential distribution of Australian acacia species in southern Africa |
| title_short | Understanding current and potential distribution of Australian acacia species in southern Africa |
| title_sort | understanding current and potential distribution of australian acacia species in southern africa |
| topic | Species distribution models Southern African Plant Invaders Atlas Forestry Classification tree Expert knowledge Field visits Alien tree UCTD |
| url | http://hdl.handle.net/2263/79720 |