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Invasive perennial species in an agricultural area of the Western Cape Province : distribution and relationship with various land-use types
Thesis (MSc)--University of Stellenbosch, 2005.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613790395170816 |
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| access_status_str | Open Access |
| author | Midgley, John Claude |
| author2 | McGeoch, M. A. |
| author_browse | McGeoch, M. A. Midgley, John Claude |
| author_facet | McGeoch, M. A. Midgley, John Claude |
| author_sort | Midgley, John Claude |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--University of Stellenbosch, 2005. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/20899 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:41:44.687Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/20899 Invasive perennial species in an agricultural area of the Western Cape Province : distribution and relationship with various land-use types Midgley, John Claude McGeoch, M. A. Esler, Karen J. Stellenbosch University. Faculty of Agrisciences. Dept. of Conservation Ecology and Entomology. Noxious weeds -- South Africa -- Western Cape Acacia mearnsii -- South Africa -- Western Cape Hakea sericea Theses -- Ecological assessment Dissertations -- Ecological assessment Invasive plants -- South Africa -- Western Cape -- Geographical distribution Thesis (MSc)--University of Stellenbosch, 2005. ENGLISH ABSTRACT: This project consists of two botanical investigations in an agricultural area of the Western Cape Province. A farm known as De Rust, in the Elgin Valley, was used to sample the geographic location, density, height and life stage of six prominent invasive plant species in various land-use categories. In the first investigation, the density, height and age structures of the six invasive species populations were analyzed. The density distribution of the six species was also displayed cartographically. Species were then ranked according to the potential threat that they pose to the conservation of the remaining natural areas on the farm. Results indicated that Acacia mearnsii and Acacia saligna are the major invaders at De Rust and that Hakea sericea can be considered as an emerging invader. The second investigation explores the statistical relationship between the various land-use categories and density, height and age of the six prominent invaders identified in the first investigation. The loglikelihood ratio analysis of observed frequencies resulted in statistically significant (P<0.01; P-values range between 1.35 x 10-3 and 2.7 x 10-224) relationships between certain land-use types and certain invasive species. A conclusion was reached that it could be useful to include land-use categories in simulation models of invasive plant species distribution and spread. AFRIKAANSE OPSOMMING: Hierdie projek behels twee botaniese ondersoeke in ‘n landbou gebied van die Weskaap. Die plaas bekend as De Rust, in die Elgin Vallei, was gebruik vir die versameling van data te doen met die geografiese ligging, plant digtheid, lengte en lewens stadium van ses prominente indringer plant spesies in verskeie landgebruik kategorieë. Die digtheid, lengte en ouderdomstruktuur van ses indringerspesies was in die eerste ondersoek geanaliseer. Die verspreiding van digtheid was ook in kaarte uitgelê. Spesies was daarna volgens hulle potentiële dreiging teen die bewaring van oorblywende natuurlike dele van die plaas in ‘n rangorde geplaas. Resiltate dui aan dat Acacia mearnsii en Acacia saligna die belangrikste indringer plante op De Rust is en dat Hakea sericea as ‘n opkomende indringer beskou kan word. Die tweede ondersoek kyk na die verhouding tussen verskeie grondgebruik kategorië en die digtheid, lengte en ouderdom van die ses prominente indringer spesies wat in die eerste ondersoek identifiseër is. ‘n Log tipe ratios ontleding van bewaarde frekwensies het ‘n statisties belangrike uitkoms gehad (P<0.01; P-waardes tussen 1.35 x 10-3 en 2.7 x 10-224) vir die verhoudings tussen sekere grondgebruik tipes en sekere indringer spesies. Die gevolgtrekking was dat dit handig mag wees om grondgebruik kategorieë in simulasies van indringer plant verspreiding te gebruik. Masters 2012-05-03T13:10:28Z 2012-05-03T13:10:28Z 2005-04 Thesis http://hdl.handle.net/10019.1/20899 en_ZA Stellenbosch University 75 leaves : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Noxious weeds -- South Africa -- Western Cape Acacia mearnsii -- South Africa -- Western Cape Hakea sericea Theses -- Ecological assessment Dissertations -- Ecological assessment Invasive plants -- South Africa -- Western Cape -- Geographical distribution Midgley, John Claude Invasive perennial species in an agricultural area of the Western Cape Province : distribution and relationship with various land-use types |
| title | Invasive perennial species in an agricultural area of the Western Cape Province : distribution and relationship with various land-use types |
| title_full | Invasive perennial species in an agricultural area of the Western Cape Province : distribution and relationship with various land-use types |
| title_fullStr | Invasive perennial species in an agricultural area of the Western Cape Province : distribution and relationship with various land-use types |
| title_full_unstemmed | Invasive perennial species in an agricultural area of the Western Cape Province : distribution and relationship with various land-use types |
| title_short | Invasive perennial species in an agricultural area of the Western Cape Province : distribution and relationship with various land-use types |
| title_sort | invasive perennial species in an agricultural area of the western cape province distribution and relationship with various land use types |
| topic | Noxious weeds -- South Africa -- Western Cape Acacia mearnsii -- South Africa -- Western Cape Hakea sericea Theses -- Ecological assessment Dissertations -- Ecological assessment Invasive plants -- South Africa -- Western Cape -- Geographical distribution |
| url | http://hdl.handle.net/10019.1/20899 |
| work_keys_str_mv | AT midgleyjohnclaude invasiveperennialspeciesinanagriculturalareaofthewesterncapeprovincedistributionandrelationshipwithvariouslandusetypes |