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Comparative water relations of indigenous and invasive Australian Proteaceae in fynbos
Water-use efficiency (WUE) as reflected in the leaf carbon stable isotope ratio was compared between co-occurring indigenous fynbos proteoids and invasive Australian hakeas H. sericea, H. gibbosa and H. suaveolens. At the driest site, H. suaveolens was slightly more WUE than several co-occurring pro...
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2017
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| _version_ | 1867613774038433792 |
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| access_status_str | Open Access |
| author | Bergh, Nicola G |
| author2 | Midgley, Jeremy J |
| author_browse | Bergh, Nicola G Midgley, Jeremy J |
| author_facet | Midgley, Jeremy J Bergh, Nicola G |
| author_sort | Bergh, Nicola G |
| collection | Thesis |
| description | Water-use efficiency (WUE) as reflected in the leaf carbon stable isotope ratio was compared between co-occurring indigenous fynbos proteoids and invasive Australian hakeas H. sericea, H. gibbosa and H. suaveolens. At the driest site, H. suaveolens was slightly more WUE than several co-occurring proteoids; there was no significant difference between hakeas and proteas at the other sites. Transpiration rates of shoots and of whole trees were compared between Hakea sericea and Protea repens growing on Stellenboschberg northeast of Cape Town. Both measurements showed no real difference between the species and it is concluded that differences in water relations are not responsible for the highly competitive growth rates of hakeas in fynbos. It is hypothesised that hakeas may be able to vegetatively outcompete proteoids as a consequence of monopodial architecture and some ability to prevent shade-limitation of photosynthesis. A rough estimate of water loss due to transpiration and interception by H. sericea stands indicates that this species may have a significant effect on catchment water loss relative to open-canopy proteoid fynbos. This effect would be due not to transpiration rates of individual trees but to consistently high densities of mature hakea stands. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/26049 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:41:29.267Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Department of Biological Sciences |
| publisherStr | Department of Biological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/26049 Comparative water relations of indigenous and invasive Australian Proteaceae in fynbos Bergh, Nicola G Midgley, Jeremy J Plant Ecology Water-use efficiency (WUE) as reflected in the leaf carbon stable isotope ratio was compared between co-occurring indigenous fynbos proteoids and invasive Australian hakeas H. sericea, H. gibbosa and H. suaveolens. At the driest site, H. suaveolens was slightly more WUE than several co-occurring proteoids; there was no significant difference between hakeas and proteas at the other sites. Transpiration rates of shoots and of whole trees were compared between Hakea sericea and Protea repens growing on Stellenboschberg northeast of Cape Town. Both measurements showed no real difference between the species and it is concluded that differences in water relations are not responsible for the highly competitive growth rates of hakeas in fynbos. It is hypothesised that hakeas may be able to vegetatively outcompete proteoids as a consequence of monopodial architecture and some ability to prevent shade-limitation of photosynthesis. A rough estimate of water loss due to transpiration and interception by H. sericea stands indicates that this species may have a significant effect on catchment water loss relative to open-canopy proteoid fynbos. This effect would be due not to transpiration rates of individual trees but to consistently high densities of mature hakea stands. 2017-11-07T13:32:17Z 2017-11-07T13:32:17Z 1998 2017-02-15T09:40:32Z Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/26049 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Plant Ecology Bergh, Nicola G Comparative water relations of indigenous and invasive Australian Proteaceae in fynbos |
| thesis_degree_str | Bachelor's / Honours |
| title | Comparative water relations of indigenous and invasive Australian Proteaceae in fynbos |
| title_full | Comparative water relations of indigenous and invasive Australian Proteaceae in fynbos |
| title_fullStr | Comparative water relations of indigenous and invasive Australian Proteaceae in fynbos |
| title_full_unstemmed | Comparative water relations of indigenous and invasive Australian Proteaceae in fynbos |
| title_short | Comparative water relations of indigenous and invasive Australian Proteaceae in fynbos |
| title_sort | comparative water relations of indigenous and invasive australian proteaceae in fynbos |
| topic | Plant Ecology |
| url | http://hdl.handle.net/11427/26049 |
| work_keys_str_mv | AT berghnicolag comparativewaterrelationsofindigenousandinvasiveaustralianproteaceaeinfynbos |