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Rozprawy doktorskie na temat „Ecological Modelling”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Darling, Paul Simon. "SAR modelling for ecological applications." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297315.

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Nightingale, Glenna Faith. "Bayesian point process modelling of ecological communities." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3710.

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The modelling of biological communities is important to further the understanding of species coexistence and the mechanisms involved in maintaining biodiversity. This involves considering not only interactions between individual biological organisms, but also the incorporation of covariate information, if available, in the modelling process. This thesis explores the use of point processes to model interactions in bivariate point patterns within a Bayesian framework, and, where applicable, in conjunction with covariate data. Specifically, we distinguish between symmetric and asymmetric species

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Sala, Claudia. "Ecological modelling for next generation sequencing data." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/6279/.

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Le tecniche di next generation sequencing costituiscono un potente strumento per diverse applicazioni, soprattutto da quando i loro costi sono iniziati a calare e la qualità dei loro dati a migliorare. Una delle applicazioni del sequencing è certamente la metagenomica, ovvero l'analisi di microorganismi entro un dato ambiente, come per esempio quello dell'intestino. In quest'ambito il sequencing ha permesso di campionare specie batteriche a cui non si riusciva ad accedere con le tradizionali tecniche di coltura. Lo studio delle popolazioni batteriche intestinali è molto importante in quanto

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Peng, Qiuliang. "Periodic differential systems with applications to ecological modelling." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0006/NQ29093.pdf.

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Doddington, Benjamin. "Modelling the environmental and ecological drivers of chytridiomycosis." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11670.

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Amphibians are the most threatened taxon assessed by the IUCN Red List, with over 42% of all species in decline. The emerging infectious disease chytridiomycosis, caused by the fungus Batrachochytrium dendrobatidis, has been shown to a driver of many of these declines. The broad aim of this thesis is to develop mechanistic models that realistically capture the observed disease dynamics of Bd within Europe, and use these to help understand its ecological and environmental drivers. Mathematical modelling, field work and experimental work are used in order to obtain an understanding of a Bd-host

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Tomlinson, Benjamin John. "Modelling Social-Ecological Systems in the Catalan Coastal Zones." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/384929.

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The Systems Approach Framework (SAF) is a methodological framework designed to enhance the efficacy of human decision-making processes within social-ecological systems with regard to sustainability. The SAF was applied in two case studies in the coastal zone of Catalonia, in two separate European Commission Framework Programme projects entitled “Science and Policy Integration for Coastal System Assessment” (SPICOSA) and “Vectors of Change in Oceans and Seas-marine Life, Impact on Economic Sectors" (VECTORS). During the SPICOSA application, a common issue of interest to most stakeholders wa

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Minoarivelo, Henintsoa Onivola. "Probabilistic modelling of the evolution of ecological interaction networks." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17990.

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Thesis (MSc)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: In any ecological system, organisms need to interact with each other for their survival. Such interactions form ecological networks which are usually very complex. Nevertheless, they exhibit well de ned patterns; these regularities are often interpreted as products of meaningful ecological processes. As the networks are evolving through time, biological evolution is one of the factors that affects ecological network architecture. In this work, we develop a mathematical model that represents the evolution through time of such

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Mancy, Rebecca. "Modelling persistence in spatially-explicit ecological and epidemiological systems." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6219/.

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In this thesis, we consider the problem of long-term persistence in ecological and epidemiological systems. This is important in conservation biology for protecting species at risk of extinction and in epidemiology for reducing disease prevalence and working towards elimination. Understanding how to predict and control persistence is critical for these aims. In Chapter 2, we discuss existing ways of characterising persistence and their relationship with the modelling paradigms employed in ecology and epidemiology. We note that data are often limited to information on the state of particular pa

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9

Clavera-Gispert, Roger. "Forward numerical modelling of carbonate basins: an ecological approach." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-213603.

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This thesis presents a new stratigraphic forward numerical model to simulate the carbonate production of marine sedimentary basin through ecological model which is implemented in the SIMSAFADIM-CLASTIC program. This ecological model is based on the Generalized Lotka Voltera equations that model the population evolution of species. These populations are controlled by biological factors (growth rate, carrying capacity and interaction among species), and by the environmental conditions (light, energy of the medium, nutrients, bottom slope and concentration of clastic sediments in suspension) whic

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Macpherson, Morag Fiona. "Modelling population and disease dynamics in complex ecological systems." Thesis, Heriot-Watt University, 2014. http://hdl.handle.net/10399/2824.

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Mathematical models are a theoretical tool used to understand ecological processes. In this thesis we create mathematical frameworks to describe and evaluate four ecological systems. In the first case study we extend a host-pathogen framework to include a maternal effect which increases the disease resistance of offspring when the maternal environment is poor. Maternal effects impacting life-history traits have been shown to increase the propensity for population cycles. Our contrasting results show maternal effects acting on disease resistance stabilise host-pathogen systems. The second case

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Johnson, Sandra. "Integrated Bayesian network frameworks for modelling complex ecological issues." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/32002/1/Sandra_Johnson_Thesis.pdf.

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Ecological problems are typically multi faceted and need to be addressed from a scientific and a management perspective. There is a wealth of modelling and simulation software available, each designed to address a particular aspect of the issue of concern. Choosing the appropriate tool, making sense of the disparate outputs, and taking decisions when little or no empirical data is available, are everyday challenges facing the ecologist and environmental manager. Bayesian Networks provide a statistical modelling framework that enables analysis and integration of information in its own right

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Bown, James Louis. "Issues of scale in individual-based models : applications in fungal and plant community dynamics." Thesis, Abertay University, 2000. https://rke.abertay.ac.uk/en/studentTheses/87bed9b3-454c-48ac-bbf6-ca6058179af8.

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The central question addressed in this thesis is whether descriptions of the dynamics of ecological systems at one scale may be effectively used as descriptions of the dynamics of ecological systems at larger scales. This question is addressed in the context of the dynamics of fungal communities. A simple experimental system and complementary theoretical approach, in the form of an individual-based (cellular automaton) model, is presented. Experimental results derived from small-scale systems are used to quantify parameters of the model; results from large-scale experimental systems serve to t

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Cruickshank, Isla. "The dynamics of ecological invasions and epidemics." Thesis, University of Strathclyde, 1999. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21436.

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The systems of interest in this study are the spread of epidemics and invasions from a small propagule introduced into an arena that was initially devoid of the given species or stage of illness. In reaction-diffusion models, populations are continuous. Populations at low densities have the same growth functions as populations at high densities. In nature, such low densities would signify extinction of a population or of a disease. This property can be removed from reaction-diffusion models by small changes in the formulation so that small populations become extinct. This can be achieved by th

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Dalmazzone, Silvana. "Economic activity and the resilience of ecological systems : complexity, nonlinearities and uncertainty in economic-ecological modelling." Thesis, University of York, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311013.

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DA, SILVA PEREIRA DANIEL FILIPE. "Qualitative modelling of ecological systems: Extending calculation procedures and applications." Doctoral thesis, Università degli studi di Ferrara, 2020. http://hdl.handle.net/11392/2487971.

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The aim of this Ph.D. was to contribute to the discipline of ecosystems networks, in particular to loop analysis, by improving on the current algorithm implementations, with particular emphasis in developing an approach to couple systems quantitative information to the analytical processes of loop analysis, and through it allow the exploration the mechanism behind a systems responsiveness to perturbations, that is, the importance of both the variables, the structure of linkages between them and the intensity of those linkages. In this thesis, after a presentation of the loop analysis and its

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16

COSTA, ANDREA. "HIERARCHICAL MODELLING IN HERPETOLOGY: APPLICATIONS IN ECOLOGICAL AND CONSERVATION STUDIES." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1001928.

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Despite the debate about the definition and subject of ecology, it is actually undeniable that the scientific study of the distribution and abundance of organisms, together with their underlying processes, is among the main subjects of ecology . Therefore, counting animals, and understanding the mechanisms that drive occurrence and abundance over space and time, have been the focus of many studies in animal science. Since population size is one of the fundamental state variables in ecology, obtaining accurate information on population abundance is of primary importance for conserv

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17

Accad, Arnon. "Vegetation communities modelling using GIS-Integrated statistical, ecological and data models /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17703.pdf.

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Bareham, Gareth. "Modelling the ecological structure of scrub in enclosed western Irish landscapes." Thesis, University of Ulster, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414991.

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Nobre, Ana Maria Domingos. "Integrated ecological-economic modelling and assessment aproach for coastal ecosystem management." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2008. http://hdl.handle.net/10362/3978.

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Thesis submitted to the Faculty of Sciences and Technology, New University of Lisbon, for the degree of Doctor of Philosophy in Environmental Sciences<br>Over the past few decades, policy-makers have defined new instruments to address coastal ecosystem degradation. Emerging coastal management frameworks highlight the use of the best available knowledge about the ecosystem to manage coastal resources and maintain ecosystem’s services. Progress is required, however, in translating data into useful knowledge for environmental problem solving. This thesis aims to contribute to research assessing

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Cafaro, Costantino. "Radon prone areas in Friuli Venezia Giulia: ecological analysis and modelling." Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/10887.

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2013/2014<br>La tesi descrive il lavoro effettuato e i progressi raggiunti durante i miei tre anni di dottorato, volti allo studio della distribuzione delle concentrazioni di radon in ambienti indoor, nello specifico in abitazioni private del Friuli Venezia Giulia. Il principale obiettivo è stato la definizione geografica delle cosiddette radon prone areas (RPA), ovvero le aree con le più alte probabilità di trovare concentrazioni di radon più elevate. Nonostante ciò, molte analisi supplementari sono state effettuate per migliorare la suddetta definizione e per ampliare il bagaglio di conoscen

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Poongavanan, Jenicca. "Modelling the range-wide density patterns of the Arthroleptella lightfooti using acoustic monitoring data." Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/31595.

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Species distributions are often limited by environmental factors and according to the abundant—centre hypothesis, abundance should be highest Where the environment is most favourable for the species. So, do the same environmental factors determine occurrence and abundance patterns inside the range? I examined this question using Arthroleptella lightfooti, a species of frog from the family of Pyxicephalidae, endemic to the mountains of the Cape peninsula. South Africa. I used density estimates obtained from acoustic Spatially Explicit Capture Recapture (aSCR) methods and data from an acoustic s

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Krug, Rainer Michael. "Modelling seed dispersal in restoration and invasions." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1155.

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Thesis (PhD (Conservation Ecology and Entomology))--Stellenbosch University, 2008.<br>Dispersal plays an essential role in determining the distribution of populations of species, especially species expanding their ranges. Two disciplines are concerned with gaining understanding of spread of species, namely restoration ecology and invasion biology. Con- ceptual understanding of dispersal, its mechanisms and its management is essential to both disciplines. Nevertheless, the disciplines have quite opposite objectives: in restoration ecol- ogy, spread of indigenous species into transformed la

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Ramdass, Indarjit. "Modelling forest dynamics and management of natural tropical rain forests." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11890.

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Rumkee, Jack Charles Oliver. "Modelling the impact of stressors on the honeybee colony." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/27654.

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The Western Honeybee (Apis mellifera) is an important species, not only ecologically and economically, but as a source of recreation to many. The pollination services the species provides benefit a number of crops worldwide, and, as the honeybee is domesticated and kept in hives, can be directed commercially. Recently, although overall global stocks are growing, there have been reports of high colony losses worldwide. Due to the value of this species, this is a worrying trend. There are many stressors facing the honeybee, both natural and anthropogenic in origin. Two of the most prevalent, bot

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Hannemann, Henrik Jonathan Nicolai. "Conservation planning in Europe : ecological, financial, and political challenges." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:6180deed-8bab-4932-8a7c-e5bd54f765ed.

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Conservation of biodiversity and sustainable resource use are central aims within ecology. This thesis focuses on the current data and environmental frameworks used to support these aims across different states in Europe. In particular, it examines the impact of geo-political boundaries on data-use, funding and planning for temporal movement of species in response to climate change. It also examines the current environmental framework agreements in Europe and their capacity to deal with trans-boundary aspects of biodiversity change. Through examination of European biodiversity datasets, undert

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Keppens, Jeroen. "Compositional ecological modelling via dynamic constraint satisfaction with order-of-magnitude preferences." Thesis, University of Edinburgh, 2002. http://hdl.handle.net/1842/324.

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Compositional modelling is one of the most important knowledge-based approaches to automating domain model construction. However, its use has been limited to physical systems due to the specific presumptions made by existing techniques. Based on a critical survey of existing compositional modellers, the strengths and limitations of compositional modelling for its application in the ecological domain are identified and addressed. The thesis presents an approach for effectively building and (re-)using repositories of models of ecological systems, although the underlying methods are domainindepen

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Baggio, Jacopo Alessandro. "Analyzing social-ecological systems : linking resilience, network theory, and agent based modelling." Thesis, University of East Anglia, 2011. https://ueaeprints.uea.ac.uk/34240/.

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Kulakowska, Katarzyna Anna. "Ecological modelling to assess the risks that pesticides pose to woodpigeon populations." Thesis, University of Reading, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629090.

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Population modelling is recognised as a potentially useful tool for pesticide risk assessment for vertebrate species. The European Food Safety Authority, which provids guidance on how to conduct such risk assessments in the EU, recommends using the woodpigeon (Columba palumbus) as a representative non-target species for a variety of crops, including oilseed rape and cereals. The woodpigeon was extensively studied in the UK for the second half of the twentieth century. The aim of this PhD was to produce a population model of wood pigeons for use in higher-tier pesticide risk assessment with a t

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Steenkamp, Pieter Johannes. "Ecological suitability modelling for anthrax in the Kruger National Park, South Africa." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/23358.

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Bacillus anthracis is the causal agent of anthrax which primarily affects ungulates, occasionally carnivores and less frequently humans. The endospores of this soil-borne bacterium are highly resistant to extreme conditions, and under ideal conditions, anthrax spores can survive for many years in the soil. The bacterium is generally found in soil at sites where infected animals have died. When these spores are exposed, they have the potential to be ingested by a mammalian species which could lead to an anthrax outbreak. Anthrax is almost never transmitted directly from host to host, but is rat

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COLOCCI, ALESSANDRA. "Modelling disaster risk reduction: decoding social-ecological interactions to foster transformative adaptation." Doctoral thesis, Università Politecnica delle Marche, 2021. http://hdl.handle.net/11566/289629.

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Questa ricerca intende contribuire alla discussione sulla riduzione del rischio disastri (DRR), esplorando come le comunità locali dovrebbero adattarsi ai pericoli che le circondano. La prima parte riporta la teoria della panarchia alle dinamiche del rischio. Il modello teorico che ne deriva, la Panarchia Sociale-Ecologica, descrive le condizioni di rischio e permette di riconoscere i nuclei del DRR: la resilienza ai disastri e la sostenibilità ambientale. Il modello fornisce le basi per lo sviluppo di una Valutazione Combinata di Resilienza e Sostenibilità, concentrata sul rischio inondazi

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Soltic, Snjezana. "Evolving connectionist systems for adaptive decision support with application in ecological data modelling." Click here to access this resource online, 2009. http://hdl.handle.net/10292/760.

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Ecological modelling problems have characteristics both featured in other modelling fields and specific ones, hence, methods developed and tested in other research areas may not be suitable for modelling ecological problems or may perform poorly when used on ecological data. This thesis identifies issues associated with the techniques typically used for solving ecological problems and develops new generic methods for decision support, especially suitable for ecological data modelling, which are characterised by: (1) adaptive learning, (2) knowledge discovery and (3) accurate prediction. These

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Harris, V. "Modelling multivariate spatio-temporal structure in ecological data and responses to climate change." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1388074/.

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In this study the behaviour of multivariate plankton communities and their relationships with climate is explored. Existing statistical methodology is adapted to analyse both the plankton communities and sea surface temperature. In the first part of this study a large scale exploratory analysis is applied using principal component analysis. Dominant temporal trends and spatial patterns for a number of indicator species and the joint responses of functional groups of species are found.The community analysis focuses on on the zooplankton and the phytoplankton, the latter respresented by diatoms.

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Psorakis, Ioannis. "Probabilistic inference in ecological networks : graph discovery, community detection and modelling dynamic sociality." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:84741d8b-31ea-4eee-ae44-a0b7b5491700.

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This thesis proposes a collection of analytical and computational methods for inferring an underlying social structure of a given population, observed only via timestamped occurrences of its members across a range of locations. It shows that such data streams have a modular and temporally-focused structure, neither fully ordered nor completely random, with individuals appearing in "gathering events". By exploiting such structure, the thesis proposes an appropriate mapping of those spatio-temporal data streams to a social network, based on the co-occurrences of agents across gathering events, w

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Laiolo, Leonardo. "Ecological modelling of the phytoplankton dynamics in the northern Gulf of Aqaba (Red Sea)." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3844/.

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The Gulf of Aqaba represents a small scale, easy to access, regional analogue of larger oceanic oligotrophic systems. In this Gulf, the seasonal cycles of stratification and mixing drives the seasonal phytoplankton dynamics. In summer and fall, when nutrient concentrations are very low, Prochlorococcus and Synechococcus are more abundant in the surface water. This two populations are exposed to phosphate limitation. During winter mixing, when nutrient concentrations are high, Chlorophyceae and Cryptophyceae are dominant but scarce or absent during summer. In this study it was tried to develop

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Hollingsworth, Ian Douglas. "Mine landform design using natural analogues." Thesis, The University of Sydney, 2010. http://hdl.handle.net/2123/7218.

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Current practice for landscape reconstruction following opencast mining relies on topographic reconstruction, adaptive land management and botanical characterisation. Environmental processes may be altered where reconstructed landforms have significant relief. Consequently, environmental outcomes in cases where there is large scale land forming are unpredictable. Moreover, landscape restoration lacks an integrated methodology, and while many mine closures have detailed ecosystem and biodiversity objectives based on natural analogue areas there has been no reliable way to design these objective

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Trifonova, Neda. "Machine-learning approaches for modelling fish population dynamics." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13386.

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Ecosystems consist of complex dynamic interactions among species and the environment, the understanding of which has implications for predicting the environmental response to changes in climate and biodiversity. Understanding the nature of functional relationships (such as prey-predator) between species is important for building predictive models. However, modelling the interactions with external stressors over time and space is also essential for ecosystem-based approaches to fisheries management. With the recent adoption of more explorative tools, like Bayesian networks, in predictive ecolog

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Prudden, H. J. "Determinants of population variability in HIV across West Africa : ecological and mathematical modelling analyses." Thesis, London School of Hygiene and Tropical Medicine (University of London), 2016. http://researchonline.lshtm.ac.uk/2634790/.

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Introduction: Mathematical models of HIV transmission have played an important role in helping to understand the drivers of the HIV epidemic, and shape the global HIV response. The underlying approaches, assumptions and structures used in HIV modelling have the potential to fundamentally influence the conclusions of any modelling analyses. For this reason, it is important that approaches to modelling HIV transmission in different contexts carefully consider how best to ‘characterise’ a populations distribution of risk and networks of sexual interaction based on data, and the implications of in

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Short, I. J. "Outputs, ecological interactions and bioeconomic modelling, of a novel silvopastoral system in lowland Ireland." Thesis, Queen's University Belfast, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431481.

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Leger, Jean-Benoist. "Modelling the topology of ecological bipartite networks with statistical models for heterogeneous random graphs." Paris 7, 2014. http://www.theses.fr/2014PA077185.

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Un réseau écologique constitue une représentation de l'ensemble des interactions entre espèces dans un contexte donné. L'analyse de la structure topologique de ces réseaux permet aux écologues d'identifier et de comprendre les processus sous-jacents. La détection de sous-groupes d'espèces interagissant fortement ensemble, souvent nommés communautés o compartiments, est un des principaux moyens pour interpréter la structure sous-jacente des réseaux. Il existe de nombreuses méthodes de classification non supervisée, qui peuvent être utilisées pour analyser des réseaux écologiques. L'analyse des

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Schill, Caroline. "Human Behaviour in Social-Ecological Systems : Insights from economic experiments and agent-based modelling." Doctoral thesis, Stockholms universitet, Stockholm Resilience Centre, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-141696.

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Progress towards sustainability requires changes in our individual and collective behaviour. Yet, our fundamental understanding of behaviour in relation to environmental change remains severely limited. In particular, little attention has been given to how individual and collective behaviours respond to, and are shaped by, non-linear environmental change (such as ‘regime shifts’) and its inherent uncertainties. The thesis makes two main contributions to the literature: 1) it provides one of the first accounts of human behaviour and collective action in relation to ecological regime shifts and

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Campbell, Dana. "Sustainable assumptions : modelling the ecological impacts of pre-pottery Neolithic farming communities in the Levant." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501734.

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During the Pre-Pottery Neolithic - Pottery Neolithic transition in the Levant, several centuries after the widespread adoption of agriculture and shortly after the adoption of mixed farming, a number of large, formerly successful communities seem to have been abandoned. These apparent settlement transformations are reported to have occurred alongside changes in technology and production, ideological behaviour and the treatment of the dead, and subsistence economy. Whether one views these purported changes as evidence of 'collapse' or not, particular transformations do seem to have taken place

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Ward, Raymond. "Landscape and ecological modelling : development of a plant community prediction tool for Estonian coastal wetlands." Thesis, University of Brighton, 2012. https://research.brighton.ac.uk/en/studentTheses/37b928df-19dc-48f5-aad8-08398383fb95.

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Estonian coastal wetlands are of international importance as they support characteristic biological diversity. Their limited extent and distribution mean that these wetlands are of high conservation concern, and as such have been identified as a priority in the European Union Habitats Directive. These wetlands are typified by a flat, extensive landscape, situated between the micro-tidal «0.02m), brackish Baltic Sea and a forest interior. Due to the low relief these wetlands may be under threat from sea level rise. This research consisted of four studies: (i) to determine and quantify the relat

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López, Moreira Mazacotte Gregorio Alejandro. "Ecological Modelling of Lake Ecosystems: Integrating hydro-thermodynamics and biogeochemistry in a reduced complexity framework." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/252545.

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Freshwater lakes are among the most important ecosystems for both human and other biological communities. They account for about 87% of surface freshwater in the planet, thus constituting a major source of drinking water. They also provide a wide range of ecosystem services that go from the sustenance of a rich biodiversity to the regulation of hydrological extremes; from the provision of a means for recreation to the support of local economies, e.g., through tourism and fisheries, just to cite a few. Lakes are now also widely recognised as natural early warning systems, their responses potent

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López, Moreira Mazacotte Gregorio Alejandro. "Ecological Modelling of Lake Ecosystems: Integrating hydro-thermodynamics and biogeochemistry in a reduced complexity framework." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/252545.

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Freshwater lakes are among the most important ecosystems for both human and other biological communities. They account for about 87% of surface freshwater in the planet, thus constituting a major source of drinking water. They also provide a wide range of ecosystem services that go from the sustenance of a rich biodiversity to the regulation of hydrological extremes; from the provision of a means for recreation to the support of local economies, e.g., through tourism and fisheries, just to cite a few. Lakes are now also widely recognised as natural early warning systems, their responses potent

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Gonzalez, Redin Julen. "Sustainable development : why is it not delivering on its promises?" Thesis, University of Dundee, 2018. https://discovery.dundee.ac.uk/en/studentTheses/b746c18b-25d8-47f6-98bf-440f136e731e.

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At the Rio Conference in 1992, the sustainable development agenda promised a new era for natural resource management, where the wellbeing of human society would be enhanced through a more sustainable use of natural resources. Several decades on, economic growth continues unabated at the expense of natural capital – as evidenced by natural resource depletion, biodiversity loss, climate change and further environmental issues. Why is this happening and what can be done about it? This research examines what socio-economic and governance factors affect sustainability in complex coupled social-ecol

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Swallow, Ben. "Bayesian multi-species modelling of non-negative continuous ecological data with a discrete mass at zero." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/9626.

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Severe declines in the number of some songbirds over the last 40 years have caused heated debate amongst interested parties. Many factors have been suggested as possible causes for these declines, including an increase in the abundance and distribution of an avian predator, the Eurasian sparrowhawk Accipiter nisus. To test for evidence for a predator effect on the abundance of its prey, we analyse data on 10 species visiting garden bird feeding stations monitored by the British Trust for Ornithology in relation to the abundance of sparrowhawks. We apply Bayesian hierarchical models to data rel

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Lee, Ka-Man. "Impact of Urbanisation on Estuarine Sandflats: Use of Ecological Indicators, Stable Isotope Enrichment and Network Modelling." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366733.

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Urbanisation often exerts large-scale adverse effects on coastal areas and estuaries, which are ecologically diverse and highly productive habitats. Understanding the ecological resilience of these habitats is a prerequisite for their management. Direct quantification of ecosystem functioning using conventional approaches, however, is difficult and time-consuming. This difficulty has greatly restricted ecosystem-level research and thus, the ability to predict an ecosystem’s responses to urbanisation. The main aim of this thesis was to assess the impact of urbanisation on estuarine sandflats. I

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Hackett, Sean. "The optimal control of dynamic pest populations." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:5035e7a5-1d81-4288-8eb0-ec05b2fd95a2.

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In the management of agricultural insect pests, short-term costs must be balanced against long-term benefits. Controls should be selected to account for both their immediate and downstream effects upon the demography and genetics of the pest, enabling suppression today without threatening suppression tomorrow. The iterative, algorithmic method of dynamic programming can provide optimal solutions to problems of this type, in which actions are taken sequentially and each action may influence those which follow it. However, this approach is fundamentally constrained with regards to the magnitude

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Pereira, Ana Carina Santos. "Linking exposure of mediterranean freshwater ecosystems to pesticides mixtures with their environmental side-effects." Doctoral thesis, ISA, 2017. http://hdl.handle.net/10400.5/14958.

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Doutoramento em Engenharia do Ambiente - Instituto Superior de Agronomia<br>In freshwater ecosystems associated with agricultural areas, organisms are exposed to a multitude of toxicologically and structurally distinct pesticides in concentrations that may fluctuate over time. However, the environmental risks of chemicals are traditionally evaluated and regulated on the basis of single substance. Understanding and improving the link between effects and exposure assessment is an important step in the current challenges of risk assessment in order to increase its ecological relevance. To this en

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Denton, Robert Daniel Denton. "Genetic, physiological, and ecological consequences of sexual and kleptogenetic reproduction in salamanders." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1501068314906519.

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