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Dissertations / Theses on the topic 'Threatened plants'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Sharma, Jyotsna. "Mycobionts, germination, and conservation genetics of federally threatened Platanthera praeclara (Orchidaceae) /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3060142.

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2

Trinder-Smith, Terry H. "Flora of the Cape Peninsula : endemism, threatened plants and conservation in perspective." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/21346.

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Bibliography: pages 72-83.<br>An updated and nomenclaturally accurate species list of flora of the Cape Peninsula was established. distribution of each of species was then databased from c. 42 000 herbarium sheets housed in the three main herbaria in South Africa. The composition of flora, taxonomic and biological aspects of endemic and threatened taxa and the conservation status the flora and endemic fauna of the Cape Peninsula were then investigated. A large nomenclatural and taxonomic change was detected with % of having undergone name changes since the last taxonomic survey in 1950. There

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3

Robison, Laura Ann. "A test of federally threatened water howellia (Howellia aquatilis Gray) presence as an indicator of unfavorable environmental conditions for invasive reed canarygrass (Phalaris arundinacea L.)." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Spring2007/l_robison_050207.pdf.

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4

Clark, Sarah Lynn. "Reproductive biology and impacts of energy development on Physaria congesta and Physaria obcordata (Brassicaceae), two rare and threatened plants in the Piceance Basin, Colorado." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1502.

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The Piceance Basin in western Colorado has undergone a drastic increase in oil and gas development over the last two decades. This increase has escalated concerns about the effects of development on the Basin’s flora and fauna, especially the rare plant community. Potential impacts from oil and gas development on rare plants may be found through decrease in plant habitat or by a decrease in plant reproductive success through changes to important pollinator communities. Here, we observed the pollinator community on two rare mustard plants, Physaria congesta and Physaria obcordata (Brassicaceae)

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5

Sinclair, Adrianne. "Recovery of the threatened economic plant goldenseal (Hydrastis canadensis)." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6315.

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The native woodland herb, goldenseal (Hydrastis canadensis), is threatened in Canada. Recovery to a non-risk category is particularly desirable given its medicinal and potential crop value. Woodland herbs probably evolved in an environment with severe and frequent disturbances, including massive floods and impacts of extinct and extirpated fauna. Lack of specific disturbance may limit growth and spread. Ecological observations and analysis (Part I) refined this hypothesis. Comparison of recent and 10 year old surveys, and stem numbers over two years, indicated lack of growth and spread. Pollin

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6

Runkowski, Mark Albert Nadir Bryden. "The Impacts of Recreational Trail Infrastructure an Threatened Plant Communities." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/367256.

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Globally, nature-based tourism and recreation is increasing. As a result there is more and more infrastructure provided to allow access to natural areas, including recreational trails used for popular activities such as mountain-biking and hiking. There are many hundreds of thousands of kilometres of trails in natural areas worldwide, but what impacts do they have on native plant communities, especially those already threatened with extinction? The first step in addressing this question involved undertaking a global systematic quantitative literature review to assess what is known and unknown

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7

Cotti, Claudia <1977&gt. "Molecular markers for the assessment of genetic variability in threatened plant species." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/660/1/Tesi_Cotti_Claudia.pdf.

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La variabilità genetica è un importante strumento per lo studio e la conservazione della biodiversità in specie rare e minacciate di estinzione. Durante il mio dottorato mi sono quindi occupata di mettere a punto diverse metodologie molecolari al fine di valutare la diversità genetica in due specie rare della flora italiana che presentano problematiche diverse e specifiche. I marcatori arbitrari RAPD e i marcatori semi-arbitrari ISSR sono stati utilizzati per valutare la diversità genetica in Quercus crenata Lam. e per confermare l’ipotesi della sua origine ibridogena dalle due specie pr

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8

Cotti, Claudia <1977&gt. "Molecular markers for the assessment of genetic variability in threatened plant species." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/660/.

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La variabilità genetica è un importante strumento per lo studio e la conservazione della biodiversità in specie rare e minacciate di estinzione. Durante il mio dottorato mi sono quindi occupata di mettere a punto diverse metodologie molecolari al fine di valutare la diversità genetica in due specie rare della flora italiana che presentano problematiche diverse e specifiche. I marcatori arbitrari RAPD e i marcatori semi-arbitrari ISSR sono stati utilizzati per valutare la diversità genetica in Quercus crenata Lam. e per confermare l’ipotesi della sua origine ibridogena dalle due specie pr

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9

Swart, Pierre André. "Horticultural propagation of the threatened species, Syncarpha revurvata (L.f.)B. Nord." Thesis, Nelson Mandela Metropolitan University, 2006. http://hdl.handle.net/10948/613.

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Syncarpha recurvata (L.f.) B. Nord. (Asteraceae, Gnaphalieae) is listed as a vulnerable (intermediate priority) species. The propagation methods of achene germination, stem cuttings, air layering and micropropagation were investigated to obtain an efficient propagation method. Smoke water dilutions of 1:100, 1:50 and 1:10 significantly increased germination, with the 1:100 smoke water dilutions showing the highest germination percentage (22.4 percent). Achenes collected between August and October 2005 showed higher germination and viability than achenes collected between May and July 2006. Fif

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10

Kashimshetty, Yamini. "Population growth and genetic diversity dynamics of modeled conservation methodologies for threatened plant species." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1468512768.

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11

Hill, Bermingham Laura. "Ecological and Evolutionary Factors Affecting Population Persistence of a Globally Threatened Wetland Plant, Polemonium Vanbruntiae (Polemoniaceae)." ScholarWorks @ UVM, 2009. http://scholarworks.uvm.edu/graddis/109.

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Ecological and evolutionary factors affecting threatened and endangered species may compromise a population’s ability to persist through time. Here, I determined how plant mating system, pollination biology, pollen source, habitat type, and white-tailed deer (Odocoileus virginianus) herbivory affected the persistence of a rare wetland endemic plant, Polemonium vanbruntiae (Eastern Jacob’s ladder). In contrast to several of the more common species of Polemonium, I found no pollen limitation in populations of P. vanbruntiae. The lack of pollen limitation was best explained by the capacity for P.

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12

Brown, J. K., D. Goldstein, and M. R. Nelson. "Plant Virus Diseases that Threaten Cucurbit Production in Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/214137.

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A number of plant viruses were isolated from diseased cucurbits in Arizona during 1982 -85. Watermelon mosiac virus 2, cucumber mosaic virus, and squash mosaic virus are previously recognized viral pathogens in Arizona and in most years are not considered economically threatening to cucurbit production. Three newly described plant viruses (lettuce infectious yellows, watermelon curly mottle and zucchini yellow mosaic) however, have the potential to, or already have, incited serious epidemics in Arizona. Losses are heaviest with these diseases when insect vector levels build up early in the gro

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13

Bracken, Jason. "A Consensus Model for Predicting the Distribution of the Threatened Plant Telephus Spurge (Euphorbia Telephioides)." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1480622681613979.

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14

Gruner, Ingrid Gerda. "Comparative Ecology and Conservation of Rare Native Broom, Carmichaelia (Fabaceae), South Island, New Zealand." Thesis, University of Canterbury. School of Forestry, 2003. http://hdl.handle.net/10092/4152.

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Using a comparative approach, the presented study explores the ecology of ten species of native New Zealand broom, Carmichaelia, and their vulnerability to competition and herbivory, with the aim of gaining a better understanding of the significance of introduced species as a threat to rare indigenous plants in New Zealand. In particular, the study focuses on the relationship between characteristics of the Carmichaelia species and their vulnerability, as well as on other factors influencing the significance of introduced species as a threat. To gain a better understanding of the ecology of the

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15

Danielsson, Brita. "Påverkas mosippa (Pulsatilla vernalis) negativt av igenväxning?" Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-93189.

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Pulsatilla vernalis is one of several endangered plant species that benefit from wildfires and small scale disturbance events that repel competing vegetation and create open patches in the vegetation cover. Previous studies argue that Pulsatilla vernalis is decreasing in numbers due to vegetation changes associated with the decrease in wildfires, forest grazing and changes in forest management. In this study, 17 populations of P. vernalis were inventoried in order to examine if soil and/or vegetation structures affect the population structure of P. vernalis (i.e. population size, presence of f

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16

Erguner, Baytok Yasemin. "Population Status, Threats And Conservation Approaches For A Highly Threatened Endemic Plant, Centaurea Tchihatcheffii Fisch. &amp." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12610122/index.pdf.

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Centaurea tchihatcheffii Fisch. &amp<br>Mey. is a critically endangered annual endemic plant found only in Ankara. This study aimed to determine its distributional range, metapopulation status, the effects of agricultural activities, and assess conservation options. Occurrences and population size estimates were carried out by ground surveys. Two adjacent subpopulations were intensively studied during 2004-2008. Plant and seed demographic data were collected in the field and by laboratory tests. Field experiments simulated the effects of agricultural practices. Risks of extinction and possible

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17

Delnevo, Nicola. "Conospermum undulatum: insights into population genetics and pollination ecology of a threatened species." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2020. https://ro.ecu.edu.au/theses/2398.

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Fragmentation of natural vegetation is currently one of the largest threats to biodiversity. Within the southwest Australia global biodiversity hotspot, the Swan Coastal Plain was historically cleared for agriculture and forestry and is now experiencing extensive land clearing for urbanisation. The wavy-leaved smokebush Conospermum undulatum is a rare species endemic to the Swan Coastal Plain, and its future persistence is threatened by urban expansion. Throughout this research, I investigated the pollination ecology of this species and found a specific association between C. undulatum and nat

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18

Gilbert, Cynthia. "Aspects of community ecology, population growth and genetic structure applied to the conservation of Polemonium pectinatum (Polemoniaceae), a rare and threatened shrub-steppe perennial /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/5535.

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19

Mountz, Elizabeth M. "Use of Remote Sensing to Identify Essential Habitat for Aeschynomene virginica (L) BSP, a Threatened Tidal Freshwater Wetland Plant." W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539617789.

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20

Niemelä, M. (Marika). "Biotic interactions and vegetation management on coastal meadows." Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514291234.

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Abstract Conservation of rare habitats and species are central elements in the management of semi-natural grasslands of high biodiversity. Understanding the impacts of various abiotic and biotic interactions and management methods on threatened species is fundamental to their conservation. In the present study, effects of competition, plant parasitism, grazing and mowing were studied at the community level in Bothnian Bay coastal meadows and in greenhouse. This was the first time when the impacts of various biotic interactions on the critically endangered creeping alkali grass (Puccinellia phr

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21

Tausch, Simone B. [Verfasser], and Peter [Akademischer Betreuer] Poschlod. "Towards preserving threatened grassland plant species and habitats - seed longevity, seed viability and phylogeography / Simone B. Tausch ; Betreuer: Peter Poschlod." Regensburg : Universitätsbibliothek Regensburg, 2019. http://d-nb.info/1183375883/34.

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22

Mainella, Alexa Marie. "Comparison of MaxEnt and boosted regression tree model performance in predicting the spatial distribution of threatened plant, Telephus spurge (Euphorbia telephioides)." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1461880521.

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23

Doolen, Chad. "A habitat analysis of two geographically isolated populations of the federally threatened Mead's milkweed (Asclepias meadii Torr. ex A. Gray) in the St. Francois Mountains of the Missouri Ozarks." Thesis, Southeast Missouri State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10126095.

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<p> Mead’s Milkweed (<i>Asclepias meadii</i>) is a federally threatened plant of tallgrass prairies in North America. Studies aimed at understanding the biology and ecology of this rare milkweed usually focus on healthy or restored populations in the tallgrass prairies of Kansas, Iowa, and Illinois. Thus, this study was designed to provide details about unique, understudied habitats surrounding isolated populations in the Missouri Ozarks. </p><p> The igneous glades of the St. Francois Mountains are small grasslands with shallow soils and harbor some of the healthiest populations of <

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24

Marques, Edward. "Effects of the Exotic Red Imported Fire Ant (Solenopsis invicta) on the Growth and Survival of the Threatened Hooded Pitcher Plant (Sarracenia minor)." UNF Digital Commons, 2015. http://digitalcommons.unf.edu/etd/615.

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Plants and insects are some of the most biodiverse groups in the world and are constantly interacting. One unique interaction that has been observed occurs between carnivorous plants and insects; some plant species are capable of capturing and digesting insects for nutrients. Despite preying on these insects, there are cases where such interactions can been viewed as mutualistic. For instance, a nectar reward is produced by the plant to attract insects, and during visitation insects may fall prey to these plants. Additionally, carnivorous myrmecophytic plants may receive an added indirect bene

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25

Lynch, AJJ. "Conservation biology and management of 16 rare or threatened Fabaceae species in Tasmania." Thesis, 1994. https://eprints.utas.edu.au/20336/1/whole_LynchAnoliaJasmynJaym1996_thesis.pdf.

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26

Victor, A. E., and A. P. Dold. "Threatened plants of the Albany Centre of Floristic Endemism, South Africa." 2003. http://eprints.ru.ac.za/345/1/sajs_dold_threatned_plants_of_the_albany.pdf.

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We present Red List assessments of threatened plants of the Albany Centre of Floristic Endemism in the Eastern Cape province of South Africa. We evaluated the status of taxa using categories and criteria adopted by the World Conservation Union (IUCN) in 1994 and updated in 2001. In total, 126 taxa are threatened with extinction in the Albany Centre, and six are now extinct. A further 22 are listed as Data Deficient. In the past, agriculture has been a severe threat to the survival of rare species in this part of the Eastern Cape; the main threats to the continuing existence of threatened plant

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27

Menke, Carolyn A. "Relationships of exotic species and wildfire to the threatened plant Silene spaldingii." Thesis, 2003. http://hdl.handle.net/1957/34519.

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In the canyon grasslands of Garden Creek Ranch Preserve in Idaho, where the threatened plant Silene spaldingii occurs and invasion by the exotic species Centaurea solstitialis and Bromus tectorum is proceeding rapidly, I examined environmental and community patterns of site invasion, and evaluated the apparent influence of invasion on Silene population vigor. In addition, two separate lightning fires at the preserve presented the opportunity to examine the short-term influence of late-season fire on this species and its associated bunchgrass plant community. I found that Silene-supporting site

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28

Parsons, Kimberley A. "Reproductive biology and floral variation in the endangered Braya longii and threatened B. fernaldii (Brassicaceae) : implications for conservation management of rare plants /." 2002.

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29

Phama, Justin Onkemetse. "The population status of the threatened endemic plant Aloe peglerae in the Magaliesberg mountain range." Thesis, 2013. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000524.

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Thesis (MTech. Nature Conservaion) -- Tshwane University of Technology 2013.<br>The aim of this study was to determine the current population status of Aloe peglerae in the Magaliesberg Mountain Range.

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30

Farrell, Bonnie A. "Histological documentation and ecological implications of bulbils in Aconitum noveboracense (Ranunculaceae), a federally protected, threatened plant species." 2008. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17463.

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31

(9822014), Vatsal Naik. "Conservation ecology, genetics and propagation of the threatened species Samadera bidwillii (Hook.f.) Oliv." Thesis, 2016. https://figshare.com/articles/thesis/Conservation_ecology_genetics_and_propagation_of_the_threatened_species_Samadera_bidwillii_Hook_f_Oliv_/13444670.

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This study examined the population ecology, genetics and propagation methods of the native threatened Samadera bidwillii (Hook.f.) Oliv. This species, previously known as Quassia bidwillii, belongs to the Simaroubaceae (order: Sapindales). It has a narrow geographic range from Mackay to Gympie in Coastal Queensland, Australia. Plant communities of S. bidwillii occur in the margins of lowland rainforests, open forests and woodlands. Some of these habitats have been subjected to extensive clearance and disintegration, resulting in a major decline in the population of S. bidwillii in recent times

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32

Moreroa, Masilo Peter. "The legal implications of grassland as a threatened treasurer : analysis of Haenertsburg Plains in South Africa." Thesis, 2014. http://hdl.handle.net/10386/1285.

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Thesis (LLM. (Philosophy of Environmental Law and Management)) -- University of Limpopo, 2014<br>Human well-being and progress toward sustainable development are vitally dependent upon improving the management of the Earth’s ecosystems to ensure their conservation and sustainable use. But while demands for ecosystem services such as food and clean water are growing, human actions are at the same time diminishing the capability of many ecosystems to meet these demands. This study explores the legal framework for the protection of grassland in South Africa. In particular, the study looks at the

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33

Ślązak, Błażej. "In vitro cultures of Viola uliginosa, a species threatened with extinction, for micropropagation and investigation of the influence of plant growth regulators on cyclotide expression." Praca doktorska, 2014. https://ruj.uj.edu.pl/xmlui/handle/item/61756.

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34

Taylor, David Anthony. "Prescribed burning to increase the richness of long-unburned and fragmented mallee communities." Phd thesis, 2019. http://hdl.handle.net/1885/160665.

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Fire regimes have been altered by human activity in fire-prone landscapes around the world. In eastern Kangaroo Island in South Australia, the frequency of fire has decreased and the richness of fragmented remnant plant communities is declining. Land managers in this area are considering reintroducing fire through prescribed burning to increase native plant species richness, but the effects of such an intervention are difficult to accurately predict. This thesis explores solutions to this problem by experimentally testing the effect of prescribed burning

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35

(9390080), Andrea N. Brennan. "A Multidisciplinary Approach to Restoration of Butternut (Juglans cinerea)." Thesis, 2020.

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<div>Anthropogenically driven global change is disrupting ecosystems and habitats of many plant species, straining the ability of native species to survive and reproduce. The overarching goal of this research was to holistically work towards restoration of a threatened tree species by connecting research from different disciplines. In order to do so, the threatened butternut tree (<i>Juglans cinerea</i>) and its hybrids were used as a case study. Hybridization can incorporate stress tolerance in plants and could be a potential restoration tool. Evidence in some wild butternut populations indic

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36

Seabrook-Davison, Mark Nicholas Hawdon. "An evaluation of the conservation of New Zealand's threatened biodiversity : management, species recovery and legislation : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Ecology at Massey University, Auckland, New Zealand." 2010. http://hdl.handle.net/10179/1246.

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Content removed from thesis due to copyright restrictions: Seabrook-Davison, M. N. H., Weihong, J. J. & Brunton, D. H. (2010). "Survey of New Zealand Department of Conservation staff involved in the management and recovery of threatened species." Biological Conservation, 143: 212-219. doi: 10.1016/j.biocon.2009.10.005. Seabrook-Davison, M. N. H., Ji, W. & Brunton, D. H. (in press). "New Zealand lacks comprehensive threatened species legislation -- comparison with legislation in Australia and the USA." Pacific Conservation Biology, 16.<br>It is only recently that New Zealand wildlife managers h

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