Population genetics and breeding ecology of the rare clonal shrub, Spiraea virginiana (Rosaceae)
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| Language: | English |
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University of Cincinnati / OhioLINK
2011
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ndltd-OhioLink-oai-etd.ohiolink.edu-ucin13064979652021-08-03T06:14:35Z Population genetics and breeding ecology of the rare clonal shrub, Spiraea virginiana (Rosaceae) Brzyski, Jessica R. Botany clonal rare genetic variation invasive germination self-incompatibility Two of the most prevalent reasons cited for the decrease in species abundance are the loss and modification of habitat and the impact from invasive species. Riparian species face both of these challenges, being in a habitat that experiences abundant water flow modifications and experiencing a degree of disturbance which is often desired by invasive species. As a result, riparian habitat contains high levels of biodiversity, and also a high frequency of rare species. Therefore, the goal of my research was to identify genetic and reproductive factors that may be hindering population growth of rare riparian species. Spiraea virginiana can be classified as a characteristic riparian shrub, is considered rare throughout its natural range, and it is suggested to be negatively impacted by competition with the invasive S. japonica. Using this study species, I examined the extent of both clonal growth and sexual reproduction, and seed germination potential using field and laboratory methods. Genetic analyses show that S. virginiana is highly clonal and populations are isolated from one another. Genetic data also indicate that S. virginiana is likely to have been rare for an extended time period rather than recently so. Possibly as a consequence of long-term isolation, sexual reproduction is minimal and there is evidence to suggest that the self-incompatibility system is breaking down. When sexual reproduction does occur and seeds are produced, their viability and germination rates are low, being significantly lower than those of S. japonica. I conclude that the prolonged survival of S. virginiana has been the result of prolific clonal propagation. Although clonality allows the species to persist and expand, it greatly diminishes the adaptive potential of the species. The lack of mates in a self-incompatible system, or the ability to self, combined with low germination rate also contributes to the rarity of this species. Since many riparian species are both clonal and self-incompatible, the information and management recommendations provided through this research could also be applied to these species of similar life history to benefit restoration efforts. 2011-09-20 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1306497965 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1306497965 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Botany clonal rare genetic variation invasive germination self-incompatibility |
| spellingShingle |
Botany clonal rare genetic variation invasive germination self-incompatibility Brzyski, Jessica R. Population genetics and breeding ecology of the rare clonal shrub, Spiraea virginiana (Rosaceae) |
| author |
Brzyski, Jessica R. |
| author_facet |
Brzyski, Jessica R. |
| author_sort |
Brzyski, Jessica R. |
| title |
Population genetics and breeding ecology of the rare clonal shrub, Spiraea virginiana (Rosaceae) |
| title_short |
Population genetics and breeding ecology of the rare clonal shrub, Spiraea virginiana (Rosaceae) |
| title_full |
Population genetics and breeding ecology of the rare clonal shrub, Spiraea virginiana (Rosaceae) |
| title_fullStr |
Population genetics and breeding ecology of the rare clonal shrub, Spiraea virginiana (Rosaceae) |
| title_full_unstemmed |
Population genetics and breeding ecology of the rare clonal shrub, Spiraea virginiana (Rosaceae) |
| title_sort |
population genetics and breeding ecology of the rare clonal shrub, spiraea virginiana (rosaceae) |
| publisher |
University of Cincinnati / OhioLINK |
| publishDate |
2011 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1306497965 |
| work_keys_str_mv |
AT brzyskijessicar populationgeneticsandbreedingecologyoftherareclonalshrubspiraeavirginianarosaceae |
| _version_ |
1719433359964241920 |