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Dissertations / Theses on the topic 'Orchid conservation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Wraith, Jenna L. "Orchid conservation: Assessing threats and conservation priorities." Thesis, Griffith University, 2020. http://hdl.handle.net/10072/392403.

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Globally, over a million species are threatened with extinction from habitat loss, climate change, over-exploitation as well as other anthropogenic activities. Orchids are particularly at risk in part due to their distinctive ecology including high species diversity, often limited geographic range for many species, and tight ecological relations with specific symbionts. They are the most diverse group of flowering plants with ~28,000 species and are found on all but one continent. However, due to increasing pressures from humans many orchids are threatened with extinction. It is therefore impo

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2

Swarts, Nigel. "Integrated conservation of the rare and endangered terrestrial orchid Caladenia huegelii H.G. Reichb." University of Western Australia. School of Earth and Geographical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0044.

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The Orchidaceae is characterized by a remarkably diverse range of life forms and some of the most highly specialized interactions with soil fungi and insect pollinators found in the flowering plants. Many species are rare or threatened with extinction either directly through loss of habitat or over-collection or, indirectly through debilitation or loss of mycorrhizal association or pollinator capacity. Australian temperate terrestrial orchids represent one of the most threatened groups in the Australian flora with many taxa clinging to existence in urban and rural bushland remnants, road verge

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3

Slaviero, Antonio <1986&gt. "Ecology and conservation strategies of target dry grassland orchid species (Orchidaceae)." Doctoral thesis, Università Ca' Foscari Venezia, 2015. http://hdl.handle.net/10579/8345.

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A causa del loro elevato livello di specializzazione ecologica, le Orchidaceae sono specie altamente vulnerabili e minacciate a scala globale ma anche bioindicatori dello stato degli habitat in cui vivono. Al fine di salvaguardare la biodiversità si rende necessario un approccio conservativo basato sulla conoscenza dell’ecologia delle specie, degli habitat in cui vivono e dei rapporti con altri organismi. Questa tesi considera tre orchidee (A. morio; H. adriaticum, O. sphegodes) quali target di studio per comprendere quali fattori ecologici siano i driver della loro fitness in un habitat parti

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4

Stewart, Scott L. "Integrated conservation of Florida Orchidaceae in the genera Habenaria and Spiranthes : model orchid conservation systems for the Americas /." View online, 2007. http://etd.fcla.edu/UF/UFE0021367/stewart_s.pdf.

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5

Mursidawati, Sofi. "Mycorrhizal association, propagation and conservation of the myco-heterotrophic orchid Rhizanthella gardneri." University of Western Australia. School of Earth and Geographical Sciences, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0014.

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Many orchids require mycorrhizal symbioses with fungi for their development and survival. Rhizanthella gardneri the Western Australian underground orchid is associated with the companion plant Melaleuca uncinata and its ectomycorrhizal fungus symbiont. Much less is known about the habitat requirements of its sister species, R. slateri, which occurs in Eastern Australia. The absence of chlorophyll from Rhizanthella gardneri and R. slateri results in total dependency on associations with fungal symbionts. Many ecological and biological aspects of these fascinating orchids remained poorly known,

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6

Gale, Stephan William. "Population ecology and conservation of Nervilia nipponica, an endangered orchid in Japan." Thesis, University of Sussex, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494944.

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Nervilia nipiponica is a small terrestrial orchid known from a limited number of woodland sites in southwest and central Japan. Its scattered distribution, small total population size and sensitivity to stochastic events have led to its classification as Endangered at the national level, and it has recently been selected as a priority species for conservation. However, the reasons for the species' rarity are obscure, and the means by which its endangered status might be ameliorated remain speculative. In this study, multi-disciplinary research was undertaken to illuminate details of the specie

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7

Swarts, Nigel. "Integrated conservation of the rare and endangered terrestrial orchid Caladenia huegelii H.G. Reichb /." Connect to this title, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0044.

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8

Gustafsson, Susanne. "Population genetic analyses in the orchid genus Gymnadenia : a conservation genetic perspective." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3305.

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9

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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10

Bougoure, Jeremy J. "The role of mycorrhizal fungi in nutrient supply and habitat specificity of the rare mycoheterotrophic underground orchid, Rhizanthella gardneri." University of Western Australia. School of Plant Biology, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0076.

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Rhizanthella gardneri (Rogers) is a critically endangered orchid restricted to two isolated regions of south-western Australia. Rhizanthella gardneri is an entirely subterranean mycoheterotrophic species that purportedly forms a tripartite relationship with a mycorrhizal fungus (Ceratobasidiales) that links with an autotrophic shrub of the Melaleuca uncinata complex to acquire nutrients. Whether the rarity of R. gardneri is intrinsic is overshadowed by the recent effect of extrinsic factors that means R. gardneri requires some form of conservation and may also be a viable candidate for restora

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11

Lin, Wuying. "Comparative Reproductive Biology of a Rare Endemic Orchid and its Sympatric Congeners in Southwestern China." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/570.

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Comparative studies on endangered species and their more common congeners can shed light on the mechanism of species rarity, and enable conservationists to formulate effective management strategies. I compared the breeding and pollination systems of the endangered Geodorum eulophioides and its two more common sympatric congeners in subtropical China. Geodorum eulophioides and G. recurvum were self-compatible, both depending on Ceratina cognata for fruit production, while G. densiflorum can autonomously self. Although the floral visitation frequency of G. eulophioides was the highest among the

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12

Sanborn, Mark A. "A Model for Field Deployment of Wireless Sensor Networks (WSNs) within the Domain of Microclimate Habitat Monitoring." NSUWorks, 2011. http://nsuworks.nova.edu/gscis_etd/296.

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Wireless sensor networks (WSNs) represent a class of miniaturized information systems designed to monitor physical environments. These smart monitoring systems form collaborative networks utilizing autonomous sensing, data-collection, and processing to provide real-time analytics of observed environments. As a fundamental research area in pervasive computing and envisioned as large-scale autonomous networks of communicating nodes capable of monitoring conditional metrics over vast geographic areas, WSNs have the potential to provide researchers and conservationists with increased knowledge of

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13

Borey, Erica. "Reichenbachia, Imperial Edition: Rediscovering Frederick Sander’s Late-Victorian Masterpiece of Botanical Art." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3292.

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This thesis project examines the history, provenance, and contemporary treatment of a rare Imperial Edition of Frederick Sander’s print collection Reichenbachia, Orchids Illustrated and Described, a high-quality orchid compendium dating to the late-nineteenth century. A local philanthropist loaned the Imperial Edition Reichenbachia, number 86 of 100 to Lewis Ginter Botanical Garden in 2011 on a long-term basis as a promised donation. Research into the origins of this collection involves several disparate historical topics, including the Victorian period of “orchid mania,” imperialist business

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14

Tsui, Yuk-chun Prisca. "Conservation and propagation of wild orchids in Hong Kong /." [Hong Kong : University of Hong Kong], 1992. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13226290.

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15

Yam, Tim-wing. "Conservation, ecology and propagation of the wild orchids of Hong Kong /." [Hong Kong : University of Hong Kong], 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1243873X.

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16

Wong, Kwong-chiu Alfred. "Conservation genetics of Hong Kong wild orchids /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2035793X.

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17

Wong, Kwong-chiu Alfred, and 黃廣潮. "Conservation genetics of Hong Kong wild orchids." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31221920.

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18

Qamaruz-Zaman, Faridah. "Conservation genetics of rare and endangered British orchids." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621726.

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19

Tsui, Yuk-chun Prisca, and 徐玉珍. "Conservation and propagation of wild orchids in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1992. http://hub.hku.hk/bib/B31210570.

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20

Kanjilal, Biswajit. "Biotechnological approach towards conservation of certain endangered orchids of North Bengal." Thesis, University of North Bengal, 1999. http://hdl.handle.net/123456789/928.

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21

Roberts, David Lesford. "Reproductive biology and conservation of the orchids of Mauritius." Thesis, Aberystwyth University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367505.

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22

Yam, Tim-wing, and 任添榮. "Conservation, ecology and propagation of the wild orchids of HongKong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31231731.

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23

Devey, Dion Stuart. "MARC RecordSystematics and conservation of Mediterranean insect-mimicking orchids (Ophrys)." Thesis, University of Reading, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494444.

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Historically, Ophrys morphological taxonomy and species delimitation have been controversial, with treatments inferring from 16 species plus 34 subspecies to as many as 252 species forming 32 complexes. Highly variable, yet possibly convergent, morphologies and paucity of sequence variation have hindered production of a robust phylogenetic framework. This project generated phylogenies and ordinations from nuclear and plastid DNA sequencing, amplified fragment length polymorphism (AFLP) and morphometric data, with the ultimate aims of producing a robust framework as a basis for more rigorous sp

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24

Nam, Kam-shing, and 藍金成. "Conservation of Hong Kong wild orchids by leaf tip culture." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31212591.

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25

Hollick, Penelope Sarah. "Mycorrhizal specificity in endemic Western Australian terrestrial orchids (tribe Diurideae): implications for conservation." Thesis, Hollick, Penelope Sarah (2004) Mycorrhizal specificity in endemic Western Australian terrestrial orchids (tribe Diurideae): implications for conservation. PhD thesis, Murdoch University, 2004. https://researchrepository.murdoch.edu.au/id/eprint/103/.

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The specificity of fungal isolates from endemic Western Australian orchid species and hybrids in the tribe Diurideae was investigated using symbiotic seed germination and analysis of the fungal DNA by amplified fragment length polymorphism (AFLP). The distribution of the fungal isolates in the field was also assessed using two different seed baiting techniques. The information from these investigations is essential for developing protocols for reintroduction and translocation of orchid species. Two groups of orchids in the tribe Diurideae were studied. Firstly, a number of Caladenia sp

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26

Hollick, Penelope Sarah. "Mycorrhizal specificity in endemic Western Australian terrestrial orchids (tribe Diurideae) : implications for conservation /." Hollick, Penelope Sarah (2004) Mycorrhizal specificity in endemic Western Australian terrestrial orchids (tribe Diurideae): implications for conservation. PhD thesis, Murdoch University, 2004. http://researchrepository.murdoch.edu.au/103/.

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The specificity of fungal isolates from endemic Western Australian orchid species and hybrids in the tribe Diurideae was investigated using symbiotic seed germination and analysis of the fungal DNA by amplified fragment length polymorphism (AFLP). The distribution of the fungal isolates in the field was also assessed using two different seed baiting techniques. The information from these investigations is essential for developing protocols for reintroduction and translocation of orchid species. Two groups of orchids in the tribe Diurideae were studied. Firstly, a number of Caladenia sp

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27

Huda, Mohammed Kamrul. "Diversity, ecology, reproductive biology and conservation of orchids of south east Bangladesh." Thesis, University of Aberdeen, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327403.

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28

au, Hollick@central murdoch edu, and Penelope Sarah Hollick. "Mycorrhizal specificity in endemic Western Australian terrestrial orchids (tribe Diurideae): Implications for conservation." Murdoch University, 2004. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20050310.91859.

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The specificity of fungal isolates from endemic Western Australian orchid species and hybrids in the tribe Diurideae was investigated using symbiotic seed germination and analysis of the fungal DNA by amplified fragment length polymorphism (AFLP). The distribution of the fungal isolates in the field was also assessed using two different seed baiting techniques. The information from these investigations is essential for developing protocols for reintroduction and translocation of orchid species. Two groups of orchids in the tribe Diurideae were studied. Firstly, a number of Caladenia spec

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29

Hurskainen, S. (Sonja). "The roles of individual demographic history and environmental conditions in the performance and conservation of northern orchids." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526220888.

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Abstract A population growth rate is the sum of all individuals’ reproduction and survival, which in turn depend on many external and internal factors, e.g. weather and individual reproductive history. In plants, for example, previous reproduction can deplete an individual’s resources, resulting in trade-offs between demographic functions. To understand these demographic processes, it is necessary to follow populations for many years. Such long-term studies are especially crucial for endangered species, as they can reveal the causes of population declines and provide information that is direct

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30

Boreau, de Roincé Catherine. "Biodiversité et aménagements fonctionnels en verger de pommiers : Implication des prédateurs généralistes vertébrés et invertébrés dans le contrôle des ravageurs." Phd thesis, AgroParisTech, 2012. http://pastel.archives-ouvertes.fr/pastel-00952799.

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L'intérêt des prédateurs généralistes dans la lutte biologique par conservation est peu étudié en verger de pommiers. Cette thèse visait à déterminer le rôle de prédateurs généralistes invertébrés (principalement carabes et araignées) et vertébrés (mésanges et chauves souris) dans le contrôle de trois ravageurs clés du pommier et de définir les éléments paysagers qui leur sont favorables. Pour cela, nous avons effectué des suivis de populations dans des vergers en agriculture biologique et nous les avons associés à des mesures de prédation des ravageurs par analyse moléculaire des contenus sto

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31

Rothé, Marie. "Élaboration d’un outil d’aide à la décision pour la conception de verger agroécologique." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0394/document.

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La lutte biologique par conservation des habitats est une voie pour réduire la dépendance et l’impact des traitements insecticides qui sont nombreux et toxiques. Elle est particulièrement appropriée pour les vergers d’agrumes qui comprennent, souvent, de grandes surfaces non cultivées. Les auxiliaires présents en plus grand nombre dans un enherbement sont alors plus facilement mobilisables lors d’attaques massives de ravageurs sur les arbres. Ce travail de thèse a pour objectif d’évaluer l’impact des modes de gestion de l’enherbement (fauche, broyage, travail du sol et herbicide) sur les commu

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32

Irvin, N. A. "Understorey management for the enhancement of populations of a leafroller (Lepidoptera: Tortricidae) parasitoid (Dolichogenidea tasmanica (Cameron)) in Canterbury, New Zealand apple orchards." Lincoln University, 1999. http://hdl.handle.net/10182/1111.

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This study investigated understorey management in Canterbury, New Zealand, apple orchards for the enhancement of populations of Dolichogenidea tasmanica (Cameron) (Braconidae) for leafroller (Lepidoptera: Tortricidae) biological control. The first objective was to determine the influence of understorey plants on the abundance of D. tasmanica and leafroller parasitism, and to investigate the mechanisms behind this influence. The second was to determine the most suitable understorey plants in terms of their ability to enhance parasitoid abundance, leafroller parasitism, parasitoid longevity, par

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33

Freestone, Marc. "Conservation of Prasophyllum - understanding orchid mycorrhizal fungi to save threatened orchids from extinction." Phd thesis, 2022. http://hdl.handle.net/1885/274586.

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The Orchidaceae are the world's second largest plant family and have a high proportion of threatened species. For some threatened orchids, ex-situ conservation is one of the few options for recovery. However, many orchids are difficult to grow ex situ, an issue complicated by their reliance on orchid mycorrhizal fungi (OMF). Prasophyllum is a large genus of orchids from Australia, with one third of species listed as threatened. However, poor seed germination has consistently affected ex situ conservation efforts. Therefore, the aim of this PhD was to improve ex situ conservation prospects for

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34

Warantz, Lana. "Sex, lies, & conservation: the design of a botanic garden centred on orchids." 2010. http://hdl.handle.net/1993/3873.

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Orchid habitat has been destroyed for centuries and as a result many species, some not even discovered yet, have been lost. From the orchid hunters of the 17th and 18th centuries to the deforestation and reckless collection of orchid species today, orchids and their habitats have continued to be at risk. Efforts such as in situ conservation, an approach to protecting orchids in their natural habitat, and ex situ conservation, the protection and propagation of orchids outside their natural habitat in places such as seed banks, laboratories, herbariums, and botanic gardens, have helped to prese

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35

Janes, JK. "Subtribe Pterostylidinae : a multidisciplinary approach to investigating and resolving taxonomic confusion." Thesis, 2010. https://eprints.utas.edu.au/10706/2/whole-thesis-janes.pdf.

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The distribution, niche-partitioning, taxonomy and population-level genetic variation of Tasmanian representatives of the subtribe Pterostylidinae were investigated. General ecological data were collected over a two year period to assess changes in the known distribution of Pterostylis species within Tasmania and identify previously unknown populations. Ecological characteristics relating to habitat were used to perform a series of canonical correspondence analyses (CCA) to effectively delimit each species’ ecological tolerances and niche hyperspace. A series of Bayesian and maximum parsimony

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36

Thompson, David Ian. "Conservation of select South African Disa Berg. species (Orchidaceae) through in vitro seed germination." Thesis, 2003. http://hdl.handle.net/10413/5579.

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Disa comprises 163 species, 131 of which occur in South Africa (SA). The genus is distributed across winter- and summer-rainfall areas, but few species transverse both climatic regions. Species are therefore regarded as winter-rainfall or summer-rainfall endemics - yet release their seeds in autumn, irrespective of provenance. Disa contributes 40 % of threatened Orchidaceae in SA, with half of the local species requiring conservation initiatives. In vitro seed germination is a potential conservation tool for producing large numbers of genetically diverse plants in relatively short periods. How

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