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Dissertations / Theses on the topic 'Risk of extinction'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Bielby, Jon. "Extinction risk and population declines in amphibians." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/4278.

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This thesis is about understanding the processes that explain the patterns of extinction risk and declines that we see in amphibians, how we can use that understanding to set conservation priorities, and how we can convert those priorities into practical, hands-on research and management. In particular, I focus on the threat posed by the emerging infectious disease, chytridiomycosis, which is caused by the chytrid fungus, Batrachochytrium dendrobatidis (Bd). Amphibians display a non-random pattern of extinction risk, both taxonomically and geographically. In chapter two I investigate the mecha

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2

Fritz, Susanne. "Comparative analyses of extinction risk in vertebrates." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5275.

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Measures of current extinction risk imply that a high proportion of the world’s species are threatened with global extinction in the near future, stressing the need for thorough understanding of extinction processes. In this thesis, I investigate three aspects of current global species extinction risk, using novel phylogenetic and spatially-explicit comparative methods. First, I develop a new measure of the phylogenetic-signal strength in extinction risk, and use it to show that the nonrandomness in global mammalian extinction risk differs with threatening processes. These results imply that t

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3

Grenyer, Richard. "Comparative approaches to the prediction of extinction risk." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408110.

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4

Bartlett, Alastair Ian. "Auto-extinction of engineered timber." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31052.

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Engineered timber products are becoming increasingly popular in the construction industry due to their attractive aesthetic and sustainability credentials. Cross-laminated timber (CLT) is one such engineered timber product, formed of multiple layers of timber planks glued together with adjacent layers perpendicular to each other. Unlike traditional building materials such as steel and concrete, the timber structural elements can ignite and burn when exposed to fire, and thus this risk must be explicitly addressed during design. Current design guidance focusses on the structural response of eng

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5

Tejedor, Garavito Natalia. "Impact of climate change on extinction risk of montane tree species." Thesis, Bournemouth University, 2014. http://eprints.bournemouth.ac.uk/21485/.

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The potential impacts of climate change on many species worldwide remains unknown, especially in those tropical regions that are centers of endemism and are highly biodiverse. This thesis provides an insight into the extinction risk of selected tree species using different species distribution modelling techniques and reviewing the current conservation status on montane forest in the Tropical Andes. Starting with a global analysis, the potential impacts of climate change on montane ecoregions is investigated, by identifying those that are more vulnerable to the expected changes in temperature

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6

White, Rachel Louise. "Global biogeography of traits and extinction risk in birds : an elevational perspective." Thesis, University of Kent, 2013. https://kar.kent.ac.uk/48195/.

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Mountains are hotspots of terrestrial species richness and endemism, but the reasons why are poorly understood. Extensive reviews of the literature, across taxa, reveal that research on trait and extinction risk variation with respect to elevational distribution are outnumbered by studies on latitudinal gradients and geographical range size, and are taxonomically and geographically restricted. The aim of this thesis is to analyse interspecific variation in morphology, life history, ecology, and extinction risk with respect to elevational distribution – at the global scale and across a broad ta

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7

Tietje, Melanie. "Combining paleontological and neontological data to assess the extinction risk of amphibians." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/19728.

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Das Aussterberisiko einer Art ist nicht zufällig, sondern wird von mehreren Faktoren bestimmt, die geografische, ökologische und morphologische Merkmale umfassen. Einige dieser Merkmale sind Teil der Kriterien zur Einschätzung der Gefährdung einer Art, wie zum Beispiel in der Roten Liste der IUCN. Diese Beurteilungen sind ein wichtiges Werkzeug für den Artenschutz, da sie eine Verteilung der Maßnahmen auf die am stärksten gefährdeten Arten ermöglichen. Dies ist besonders wichtig für Amphibien, die Wirbeltiergruppe mit dem derzeit höchsten Anteil an bedrohten Arten. Bei einem großen Teil der

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8

Di, Fonzo Martina Maria Isabella. "Inferring extinction risk and causation from population trends : case studies in the vertebrates." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/39388.

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9

Bland, Lucie. "Resolving the effects of Data Deficient species on the estimation of extinction risk." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/24945.

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Cost-effective reduction in the uncertainty surrounding global indicators of biodiversity change is a central goal of conservation. In this thesis, I identify and resolve the effects of IUCN Data Deficient species on the estimation of global patterns and levels of extinction risk. I show that gaps in our knowledge of species' conservation status are primarily driven by spatial patterns of ecological research (Chapter 2). Large numbers of species are extremely poorly known, highlighting the importance of basic taxonomic and natural history information in conservation assessments. Using sensitiv

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10

Cameron, Alison. "Extinction risk from climate change, and a case study for conservation planning in Madagascar." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416802.

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11

Romans, Amy. "The macroecological distribution of avian functional diversity : environment, extinction risk and protected area coverage." Thesis, University of East Anglia, 2014. https://ueaeprints.uea.ac.uk/52159/.

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134 bird species have gone extinct since 1500 and more than a fifth are currently threatened or near-threatened. Consequences of biodiversity loss for ecosystems depend on community composition rather than simply species richness, hence interest in functional diversity (FD) - variety of traits that influence ecosystem functioning – has increased. This thesis uses a global set of avian traits and geographic range maps to investigate the macroecological distribution of FD. Old World latitudinal gradients of FD are found to reflect contemporary environment, particularly energy availability. Analy

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12

Mark, Jennifer. "Applications of the IUCN Red List in evaluating global extinction risk of timber tree species." Thesis, Bournemouth University, 2018. http://eprints.bournemouth.ac.uk/30531/.

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Anthropogenic deforestation and habitat degradation are major pressures on biodiversity. The world’s wild-growth timber tree species additionally face pressure from unsustainable and illegal harvest practices. Despite the threats to these economically valuable species, our understanding of their extinction risk remains incomplete and outdated. In fact, many timber tree taxa are marketed under trade names only, making it difficult to identify those most at risk. An additional challenge is presented by limited data and the pressing need for rapid species assessment in order to inform conservatio

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13

Golding, Janice Sarah. "Herbarium-based Trait Studies on Plant Extinction Risk in the Flora Zambesiaca Region, South-Central Africa." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517144.

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14

Devenish, Christian. "Developing tools for improved population and range estimation in support of extinction risk assessments for Neotropical birds." Thesis, Manchester Metropolitan University, 2017. http://e-space.mmu.ac.uk/618193/.

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Species abundance and distribution metrics are cornerstones of conservation planning, for example, in establishing extinction risk and selecting priority areas, but abundance data are scarce and costly to obtain in comparison to those on species occurrence. Occurrence records, often from citizen science or nonsystematic surveys, are increasingly used to model species’ distributions using environmental predictors. Methods to relate occurrence models to abundance, and therefore, provide greater understanding of patterns of abundance across species’ ranges and population size estimates could brin

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15

Janney, Donna M. "A Component Analysis of Function-Based Intervention: The Role of the Extinction Procedure." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/193525.

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The primary purpose of this study was to test the assumption that function-based interventions developed using the Function-Based Intervention Decision Model (Umbreit, Ferro, Liaupsin, & Lane, 2007) must consist of three method elements (i.e., adjustment of antecedent conditions, providing appropriate reinforcement for replacement behaviors, and eliminating reinforcement for target behaviors) for an optimal effect on changing behavior. In this study, the contribution of the extinction procedure was examined with three elementary school-aged students who were at risk for emotional and behaviora

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16

Subedi, Yuba Raj. "The response of ecosystems to an increasingly variable climate." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78470.

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A wide range of ecological communities ranging from polar terrestrial to tropical marine environments are affectedby global climate change. Over the last century, atmospheric temperature has increased by an average of 0. 60 C andis expected to rise by 1.1- 6.40C over the next 100 years. This rising temperature has increased the intensity andfrequency of weather extremes due to which a large number of species are facing risk of extinction. Studies haveshown that species existing on lower latitude are more sensitive to temperature variability compared to speciesexisting on higher latitude but te

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17

Bunney, Katherine. "Searching for patterns of extinction risk in three sections of Gladiolus (Homoglossum, Hebea and Heterocolon) in southern Africa." Bachelor's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/26691.

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18

Bracebridge, Claire Elizabeth. "Range and population expansion as tools to reduce the extinction risk in a 'critically endangered' primate : kipunji Rungwecebus kipunji." Thesis, Manchester Metropolitan University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555620.

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Kipunji Rungwecebus kipunji, a Tanzanian endemic and Africa's rarest monkey, was only discovered in 2003. It was subsequently categorised as 'critically endangered' on the IUCN Red List, with 93% of the population found in the degraded Mt Rungwe and Livingstone forests (RL) of the Southern Highlands. Aspects of kipunji ecology and habitat characteristics were investigated for the RL population to inform future evidence-based conservation, and more specifically to look at how range and population expansion can be used as tools to reduce the extinction risk of a 'critically endangered' species.

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19

Inoue, Kentaro. "A Comprehensive Approach to Conservation Biology: From Population Genetics to Extinction Risk Assessment for Two Species of Freshwater Mussels." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1437683696.

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20

Säterberg, Torbjörn. "Minimum Ecologically Viable Populations : Risk assessment from a multispecies perspective." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18959.

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<p> </p><p> </p><p> </p><p>The extinction risk of threatened species has traditionally been assessed by the use of tools of Population Viability Analysis (PVA). Species interactions, however, have seldom been accounted for in PVA:s. The omission of species interactions in risk assessments may further lead to serious mistakes when setting target sizes of populations. Even a slight abundance decrease of a target species may result in changes of the community structure; in the worst case leading to a highly impoverished community. Of critical importance to conservation is therefore the question o

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21

Mansour, Ali. "Factors associated with abundance and extinction risk in birds and hoverflies at local and global scales : an analysis using 'random forests'." Thesis, Manchester Metropolitan University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551309.

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The loss of biodiversity is one of the most urgent crises which the world faces. There have been many known extinctions and probably many more unnoticed extinctions in recent decades and the number of species at risk of extinction is increasing. Extinction is the final consequence of serious environmental and/or genetic stress for a population and the species which are most likely to become extinct in the near future are those which, according to the mCN Red List, are the most highly endangered ones at the present time. It is still inadequately clear why some species become endangered while ot

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22

Durham, Debra L. "Variation in responses to forest disturbance and the risk of local extinction : a comparative study of wild Eulemurs at Ranomafana National Park, Madagascar /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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23

Irwin, Amanda. "Consumption-based accounting of biodiversity loss." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29445.

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Biodiversity is critical to life on earth, yet projections show that loss of biodiversity, specifically the increase in species extinction risk, is likely to continue without significant intervention. Human activity is a key driver of this loss, with local, direct activity often induced by geographically distant consumption of goods and services. In order to reduce biodiversity loss, we need first to quantify it, then identify key actors implicated in the loss and finally, develop interventions which can successfully halt that loss. This work presents a methodology for consumption-based ac

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24

Machado, Flávia de Figueiredo. "Conservação e risco de extinção em primatas." Universidade Federal de Goiás, 2018. http://repositorio.bc.ufg.br/tede/handle/tede/8831.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2018-08-28T11:09:57Z No. of bitstreams: 2 Tese - Flávia de Figueiredo Machado - 2018.pdf: 3861358 bytes, checksum: d1d99c2f2391b7000da1d2f269179035 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-08-28T11:16:05Z (GMT) No. of bitstreams: 2 Tese - Flávia de Figueiredo Machado - 2018.pdf: 3861358 bytes, checksum: d1d99c2f2391b7000da1d2f269179035 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Made ava

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25

Tietje, Melanie [Verfasser], Mark-Oliver [Gutachter] Rödel, Nadia [Gutachter] Fröbisch, Erin E. [Gutachter] Saupe, and Liliane [Gutachter] Rueß. "Combining paleontological and neontological data to assess the extinction risk of amphibians / Melanie Tietje ; Gutachter: Mark-Oliver Rödel, Nadia Fröbisch, Erin E. Saupe, Liliane Rueß." Berlin : Humboldt-Universität zu Berlin, 2019. http://d-nb.info/1182542298/34.

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26

Myburgh, Erena. "Evaluating methods for fire protection and related fire risk categories in rural towns of the Western Cape, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20066.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Water flows required for fire protection (fire flows) from water distribution systems (WDS) in rural towns in the Western Cape Province, South Africa, were evaluated as part of this research project. The fire flow requirements specified in different South African guidelines, as well as a number of international standards, were compared. Various guidelines and codes used in South Africa, including the South African National Standards, specify fire flow requirements according to the risk category of the area concerned. Alternat

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Ingham, Valerie. "The art of multimodal decision making by incident controllers on the fireground." Thesis, View thesis, 2009. http://handle.uws.edu.au:8081/1959.7/43936.

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Decision making on the fireground is a difficult and accountable activity. Incident Controllers constantly juggle their legal obligations, the welfare of firefighting crews and the plight of victims and property in complex and often life-threatening situations. Assessing risk and subsequent decision making are core aspects of their role. The positivist-scientific paradigm dominates the decision theory landscape in the form of the Rational Choice model. The best alternative is Naturalistic Decision Making, but its challenge has been almost neutralised by a struggle to shape research concerning

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28

Lootvoet, Amélie. "Le rôle du comportement dans la vulnérabilité aux pressions anthropiques et à l'extinction chez les Primates." Thesis, Paris, AgroParisTech, 2014. http://www.theses.fr/2014AGPT0080.

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Depuis quelques dizaines d’années, un intérêt croissant s’est développé pour la protection des espèces et la compréhension des mécanismes qui les conduisent à l’extinction. Actuellement, les causes d’extinction sont pour la grande majorité d’origine anthropique, mais un certain nombre de facteurs intrinsèques, propres à chaque espèce, peuvent interagir avec ces pressions anthropiques, pour aboutir au risque d’extinction. De nombreuses études ont mis en évidence l’impact des traits d’histoires de vie et des caractéristiques écologiques dans la vulnérabilité des espèces à l’extinction, mais très

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29

Acan, Sinan Can. "Genetic Diversity Of Sheep Breeds Focusing On Conservation Research In Turkey." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614257/index.pdf.

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In the first part of the present study, samples of 13 native Turkish sheep breeds (n=628) were examined, individually and comparatively, with respect to their 19 microsatellite loci to characterize them by employing various statistical analyses. Low FST values, high mean number of alleles and allelic richness as well as results of Factorial Correspondence Analysis and Structure analyses showed the degree of admixture between native sheep breeds of Turkey, IVE and SAK were observed as the most distincts of the breeds and possible introgressions were detected in other breeds. The 2- BAD, a softw

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30

Armelin, Renato Soares. "As dinâmicas de Schefflera angustissima (March.) Frodin (Araliaceae) e de Andira anthelmia (Vell.) March. (Fabaceae) na reserva de Morro Grande, São Paulo." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-11012006-090156/.

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A dinâmica de populações trata das variações, no tempo e no espaço, das densidades e tamanhos de populações. Estudos sobre a dinâmica de espécies arbóreas tropicais, mais especificamente, só ganharam notoriedade a partir da década de 1970, quando o risco de extinção de espécies de interesse econômico tornou-se premente. Como a destruição dos biomas brasileiros vem sendo progressiva e contínua, uma parcela significativa da diversidade encontra-se sob ameaça de extinção, particularmente na Floresta Ombrófila Densa Atlântica, cujos remanescentes correspondem a menos de 7,5 % de sua cobertura orig

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31

Ingham, Valerie. "The art of multimodal decision making by incident controllers on the fireground." View thesis, 2009. http://handle.uws.edu.au:8081/1959.7/43936.

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Thesis (Ph.D.)--University of Western Sydney, 2009.<br>A thesis presented to the University of Western Sydney, College of Arts, Centre for Cultural Research, in fulfilment of the requirements for the degree of Doctor of Philosophy. Includes bibliographies.

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32

Contreras, Macbeath Einar Topiltzin. "An analysis of the spatial distribution of freshwater fishes of Mexico, their conservation status, and the development of a conservation strategy for species with imminent risk of extinction based on contemporary theories and practices." Thesis, Manchester Metropolitan University, 2014. http://e-space.mmu.ac.uk/580129/.

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Due to human activities freshwaters are experiencing declines in biodiversity far greater than those in the most affected terrestrial and marine ecosystems, consequently freshwater fishes are by far the most affected group of vertebrates. This situation stands true for Mexican freshwater fishes and their corresponding ecosystems. In this respect, Mexico has a long history of environmental policy, and seeking to protect its biodiversity, the country has carried out a series of important initiatives in response to the adoption of the Convention on Biological Diversity (CBD), such as the creation

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33

Schwager, Monika. "Climate change, variable colony sizes and temporal autocorrelation consequences of living in changing environments /." Phd thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976666448.

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34

Gudmundson, Sara. "Stabilizing factors in spatially structured food webs." Thesis, Linköping University, Linköping University, Theoretical Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18657.

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<p>Ecological models have problems showing the positive relationship between diversity and stability found in nature. Theory states that complex food webs have high extinction risks and low stability. However, persistent food webs found in nature are large and complex containing many interconnections between species. There are many possible mechanisms enabling persistent food webs such as; complex interaction patterns, asynchronous fluctuations of species densities, environmental fluctuations and spatial distribution. These factors have not been used in classical models. In this study, coloure

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35

Marija, Miličić. "Funkcionalni karakteri i modelovanje distribucije vrsta osolikih muva (Diptera: Syrphidae) jugoistočne Evrope u proceni rizika od izumiranja." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=105155&source=NDLTD&language=en.

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U radu je izvr&scaron;ena podela 572 registrovane vrste osolikih muva sa područja jugoistočne Evrope na funkcionalne grupe, na osnovu registrovanih funkcionalnih karaktera. Zaodabrane 44 endemske i nativne ne-endemske vrste koje su svojim klimatskim ni&scaron;ama ograničene na istraživani prostor, kreirane su mape sada&scaron;nje i buduće potencijalne distribucije (za dva perioda, 2041 -2060 i 2061-2080) upotrebom MAXENT algoritma. Na osnovu dobijenih mapa, izračunata je potenijalna promena areala za odabrane vrste, čime je procenjen efekat klimatskih promena na distribuciju vrsta sirfida. Det

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Pénisson, Sophie. "Conditional limit theorems for multitype branching processes and illustration in epidemiological risk analysis." Phd thesis, Université Paris Sud - Paris XI, 2010. http://tel.archives-ouvertes.fr/tel-00570458.

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Cette thèse s'articule autour de la problématique de l'extinction de populations comportant différents types d'individus, et plus particulièrement de leur comportement avant extinction et/ou en cas d'une extinction très tardive. Nous étudions cette question d'un point de vue strictement probabiliste, puis du point de vue de l'analyse des risques liés à l'extinction pour un modèle particulier de dynamique de population, et proposons plusieurs outils statistiques. La taille de la population est modélisée soit par un processus de branchement de type Bienaymé-Galton-Watson à temps continu multityp

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Gaiger, Frances Jean. "Mid-Pleistocene Extinction of Deep-Sea Ostracoda?" Thesis, University of Canterbury. Geological Sciences, 2006. http://hdl.handle.net/10092/1349.

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A global extinction event has been documented in protozoan foraminifera in the late Pliocene to Pleistocene. The timing of the extinction event varied depending on location, however for Ocean Drilling Project Site 1125, disappearances occurred between 2.5 and 0.57 Ma, with the major decline approximately 1.1 Ma. In order to determine if this event affected benthic organisms other than protozoans, this study was undertaken to determine how podocopid ostracods (Crustacea) recovered Ocean Drilling Program Site 1125 responded. The present study was hindered by the small number of valves recovered

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ELIAS, Marcos Antonio da Silva. "Ecologia reprodutiva de Cardiopetalum calophyllum (Annonaceae) em fragmentos de Cerrado do Brasil Central." Universidade Federal de Goiás, 2010. http://repositorio.bc.ufg.br/tede/handle/tde/2544.

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Made available in DSpace on 2014-07-29T16:21:14Z (GMT). No. of bitstreams: 1 Dissertacao_Marcos_2010_07-05-10.pdf: 927850 bytes, checksum: 13570c6d61616b1413fb06f5e981d383 (MD5) Previous issue date: 2010-03-31<br>Habitat fragmentation is one of the main causes of environmental degradation and a great threat to world biodiversity. Fragmentation can disrupt pollination processes, affecting directly or indirectly pollinators and plants. In Brazil, the Cerrado Biome has lost most part of its vegetation cover in the last four decades, becoming a highly fragmented landscape with many small fragmen

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Estopinan, Joaquim. "A predictive approach to determining the joint conservation status of species." Electronic Thesis or Diss., Université de Montpellier (2022-....), 2023. http://www.theses.fr/2023UMONS062.

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Les modèles de distribution d'espèces (SDMs) ont pour but d'apprendre les préférences environnementales des espèces et de projeter leur distribution géographique.Les récentes percées dans le domaine de l'apprentissage profond, associées à l'explosion des données sur la biodiversité, ont conduit au développement d'une nouvelle génération de modèles appelés deep-SDMs.Dans cette thèse, nous explorons leur application pour la conservation de la biodiversité.Tout d'abord, nous évaluons la contribution des séries temporelles d'images satellites en tant que covariables environnementales.La capture de

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Lengyel, Alina. "Predicting extinction risks to landbirds on tropical islands : a Western Indian Ocean model." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/4754.

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Lin, Han. "Computational study of smoke suppression by using water mist and sprinkler fire protection system in high rise building fire." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691674.

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Carvajal-Quintero, Juan. "Évaluation des déterminants de l'aire de répartition des poissons d'eau douce pour éclairer leur écologie et conservation." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30090.

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Comprendre la répartition géographique des espèces dans l'espace et le temps est un défi de longue date en écologie et évolution. Parmi les principales composantes de la répartition des espèces, la taille de l'aire de répartition géographique a été étudiée dans plusieurs groupes taxonomiques, et liée à de multiples facteurs écologiques et évolutifs. La taille de l'aire de répartition géographique des espèces est également liée au risque d'extinction, où les espèces occupant des aires géographiques plus petites présentent un risque d'extinction plus élevé, et relève donc d'une importance primor

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Magnognou, Sambouni Brady Axel. "Etudes numériques et expérimentales sur le risque d'inflammation des gaz imbrûlés au cours d'un incendie en milieu sous-ventilé." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2016. http://www.theses.fr/2016ESMA0022/document.

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Cette thèse de doctorat est consacrée à l’étude sur le risque d’inflammation de gaz imbrûlés au niveau du système de ventilation suite à un incendie dans un milieu confiné sous-ventilé. La caractérisation de l’état de stratification des fumées et du désenfumage apparaît aussi comme un objectif. Lors d’un incendie en milieu clos, la quantité d’oxygène présente dans le local peut devenir insuffisante, engendrant une combustion incomplète. Des gaz chauds imbrûlés résiduels peuvent alors s’accumuler dans le local et être évacués par la ventilation d’extraction. Lorsque ces derniers sont mis en pré

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"Macroecological drivers of extinction risk in early Cenozoic mollusks." THE UNIVERSITY OF CHICAGO, 2010. http://pqdtopen.proquest.com/#viewpdf?dispub=3369451.

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Deane, David Charles. "Quantifying biodiversity patterns and extinction risk in seasonal wetland plant communities." Thesis, 2016. http://hdl.handle.net/2440/100216.

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Wetlands are among the most threatened habitats on Earth. They are essential components of functional landscapes, providing habitat for native flora and fauna as well as supporting critical ecosystem services. Loss of wetland biodiversity threatens these values. There is an urgent need to understand patterns of wetland biodiversity, the processes creating these and the risk of species loss to plan effective intervention. Species-area relationships have a successful, although controversial, history of quantifying the risk of extinction in terrestrial biomes, and can provide rapid estimates of e

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SORIA, GONZALEZ DE BUITRAGO CARMEN DIANA. "Projected effect of global change on species' change in extinction risk." Doctoral thesis, 2022. http://hdl.handle.net/11573/1652541.

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Climate change has become one of the major drivers of biodiversity loss, its effects are not only already evident across all levels of biological organization (from genes to ecosystems) but are projected to increase in the coming decades. The probability of a species or population being negatively impacted by climate change (i.e., risk) is determined by the occurrence of adverse climatic events or trends (i.e., hazard), the occurrence of the species or population in areas that could be impacted (i.e., exposure), and their predisposition to be adversely affected, including their sensitivity or

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Ocampo-Penuela, Natalia. "Using Bird Distributions to Assess Extinction Risk and Identify Conservation Priorities in Biodiversity Hotspots." Diss., 2016. http://hdl.handle.net/10161/12126.

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<p>Habitat loss, fragmentation, and degradation threaten the World’s ecosystems and species. These, and other threats, will likely be exacerbated by climate change. Due to a limited budget for conservation, we are forced to prioritize a few areas over others. These places are selected based on their uniqueness and vulnerability. One of the most famous examples is the biodiversity hotspots: areas where large quantities of endemic species meet alarming rates of habitat loss. Most of these places are in the tropics, where species have smaller ranges, diversity is higher, and ecosystems are most t

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Weltz, K. "Evaluating the extinction risk of the endangered Maugean skate (Zearaja maugeana), Macquarie Harbour, Tasmania." Thesis, 2018. https://eprints.utas.edu.au/28605/.

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Rare species, with low population sizes, restricted ranges and specialized habitat requirements, are particularly vulnerable to extinction. A small population generally has a low genetic effective population size (Ne) and can be susceptible to genetic effects (i.e. genetic drift and inbreeding), resulting in the loss of population fitness and a reduced evolutionary potential to adapt to changes occurring in the environment. Species that have a restricted range generally have less ecological flexibility, resulting in highly specialized diet and habitat requirements, which, should these become c

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Zuj, DV. "Moderators of the relationship between fear extinction learning and posttraumatic stress disorder." Thesis, 2017. https://eprints.utas.edu.au/23948/1/Zuj_whole_thesis.pdf.

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\(Background:\) Posttraumatic stress disorder (PTSD) is a psychiatric condition that occurs following a severe traumatic event, and is associated with distressing intrusive memories, avoidance of trauma reminders, hyperarousal, and negative (alterations in) cognitions and mood. A key theoretical model posits that symptoms persist, in part, due to impaired extinction of conditioned fear. Recent evidence suggests that the fear extinction account of PTSD is a complex multifaceted framework of important biological and cognitive features, including sleep quality, catastrophic negative appraisals, n

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van, der Meer Martin H. "Coming, going, gone?: Population connectivity and extinction risk in restricted range coral reef fishes on isolated islands." Thesis, 2013. https://researchonline.jcu.edu.au/40691/1/40691-van-der-meer-2013-thesis.pdf.

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In the terrestrial environment the highest rates of extinction have been in endemic species on isolated islands. In recent years, threats to coral reefs on isolated islands have increased causing both local and global extinctions. Effective management that maintains restricted range species must be based on identified important source and/or sink populations. This requires knowledge of abundance, distribution, habitat specialization, patterns and levels of population connectivity and levels of genetic diversity within and among inhabited locations for all species of interest. Here I evaluate t

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