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The evolution and prevalence of reproductive assurance in the genus Lachenalia
Since its proposal by Darwin (1876), the concept of reproductive assurance (RA) has been much discussed, modified and tested. It is hypothesized to occur under pollen- and/or mate-limitation, each of which can arise in a multitude of manners, and RA itself takes many forms. Here its evolution and pr...
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2015
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| _version_ | 1867611289107300352 |
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| access_status_str | Open Access |
| author | Rink, Ariella |
| author2 | Verboom, Tony |
| author_browse | Rink, Ariella Verboom, Tony |
| author_facet | Verboom, Tony Rink, Ariella |
| author_sort | Rink, Ariella |
| collection | Thesis |
| description | Since its proposal by Darwin (1876), the concept of reproductive assurance (RA) has been much discussed, modified and tested. It is hypothesized to occur under pollen- and/or mate-limitation, each of which can arise in a multitude of manners, and RA itself takes many forms. Here its evolution and prevalence in the genus Lachenalia (Asparagaceae) is investigated. The genus exhibits many of the characteristics suggested in the literature to be associated with reproductive assurance, including intraspecific polyploids, vegetative reproduction and self-compatibility. Of the 27 study species, 20 were found to be self-compatible and four were capable of autonomous self-pollination. Pollinator-dependent species were found to have more attractive floral display structures. The five species exhibiting intraspecific polyploidy were all self-compatible. Offset production, known to occur in many Lachenalia species, was thought to exhibit a negative association with self-compatibility. No significant association, however, was found. A deeper understanding of the patterns of reproductive assurance in the genus requires study of the mechanisms enforcing self-incompatibility, and of the ecological and physiological correlates of reproductive assurance, is needed. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/14015 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| 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:11427/14015 The evolution and prevalence of reproductive assurance in the genus Lachenalia Rink, Ariella Verboom, Tony Rodger, James Biological Sciences Since its proposal by Darwin (1876), the concept of reproductive assurance (RA) has been much discussed, modified and tested. It is hypothesized to occur under pollen- and/or mate-limitation, each of which can arise in a multitude of manners, and RA itself takes many forms. Here its evolution and prevalence in the genus Lachenalia (Asparagaceae) is investigated. The genus exhibits many of the characteristics suggested in the literature to be associated with reproductive assurance, including intraspecific polyploids, vegetative reproduction and self-compatibility. Of the 27 study species, 20 were found to be self-compatible and four were capable of autonomous self-pollination. Pollinator-dependent species were found to have more attractive floral display structures. The five species exhibiting intraspecific polyploidy were all self-compatible. Offset production, known to occur in many Lachenalia species, was thought to exhibit a negative association with self-compatibility. No significant association, however, was found. A deeper understanding of the patterns of reproductive assurance in the genus requires study of the mechanisms enforcing self-incompatibility, and of the ecological and physiological correlates of reproductive assurance, is needed. 2015-09-15T10:32:52Z 2015-09-15T10:32:52Z 2013 Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/14015 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Biological Sciences Rink, Ariella The evolution and prevalence of reproductive assurance in the genus Lachenalia |
| thesis_degree_str | Bachelor's / Honours |
| title | The evolution and prevalence of reproductive assurance in the genus Lachenalia |
| title_full | The evolution and prevalence of reproductive assurance in the genus Lachenalia |
| title_fullStr | The evolution and prevalence of reproductive assurance in the genus Lachenalia |
| title_full_unstemmed | The evolution and prevalence of reproductive assurance in the genus Lachenalia |
| title_short | The evolution and prevalence of reproductive assurance in the genus Lachenalia |
| title_sort | evolution and prevalence of reproductive assurance in the genus lachenalia |
| topic | Biological Sciences |
| url | http://hdl.handle.net/11427/14015 |
| work_keys_str_mv | AT rinkariella theevolutionandprevalenceofreproductiveassuranceinthegenuslachenalia AT rinkariella evolutionandprevalenceofreproductiveassuranceinthegenuslachenalia |