Rozprawy doktorskie na temat „Population dynamics”
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Koons, David Nelson Grand James Barry. "Transient population dynamics and population momentum in vertebrates". Auburn, Ala, 2005. http://repo.lib.auburn.edu/EtdRoot/2005/SPRING/Forestry_and_Wildlife_Sciences/Dissertation/KOONS_DAVID_55.pdf.
Pełny tekst źródłaRuaro, Lorenzo. "Population dynamics of Ctenosaura bakeri". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20747/.
Pełny tekst źródłaAgassiz, David J. L. "Population dynamics of invading insects". Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678691.
Pełny tekst źródłaPatra, Pintu. "Population dynamics of bacterial persistence". Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/6925/.
Pełny tekst źródłaDas Leben von Mikroorganismen kann in zwei charakteristische Phasen unterteilt werde, schnelles Wachstum unter Wachstumsbedingungen und Überleben unter schwierigen Bedingungen. Die Bedingungen, in denen sich die Mikroorganismen aufhalten, verändern sich in Raum und Zeit. Um sich schnell an die ständig wechselnden Bedingungen anzupassen entwickeln die Mikroorganismen diverse Strategien. Phänotypische Heterogenität ist eine solche Strategie, bei der sich eine isogene Popolation in Untergruppen aufteilt, die unter identischen Bedingungen verschieden reagieren. Bakterielle Persistenz ist ein Paradebeispiel einer solchen phänotypischen Heterogenität. Hierbei überlebt eine Popolation die Behandlung mit einem Antibiotikum, indem sie einen Teil der Bevölkerung in einem, dem Antibiotikum gegenüber tolerant Zustand lässt, der sogenannte "persister Zustand". Persister-Zellen wachsen unter Wachstumsbedingungen langsamer als normale Zellen, jedoch überleben sie länger in Stress-Bedingungen, wie bei Antibiotikaapplikation. Bakterielle Persistenz wird experimentell erkannt indem man überprüft ob die Population eine Behandlung mit Antibiotika überlebt und sich in einem Wachstumsmedium reaktiviert. Die zugrunde liegende Popolationsdynamik kann mit einem Zwei-Zustands-Modell für reversibles Wechseln des Phänotyps einer Zelle in der Bevölkerung erklärt werden. Wir untersuchen das bestehende Modell mit einem neuen theoretischen Ansatz und präsentieren analytische Ausdrücke für die Zeitskalen die für das Bevölkerungswachstums und die Reaktivierung beobachtet werden. Diese können dann einfach benutzt werden um die Parameter des zugrunde liegenden bakteriellen Persistenz-Modells zu bestimmen. Darüber hinaus rekapitulieren wir bisher bekannten Ergebnisse über die Entwicklung solch strukturierter Bevölkerungen unter periodisch schwankenden Bedingungen mithilfe unseres einfachen Näherungsverfahrens. Mit unserer Analysemethode bestimmen wir Modellparameter für eine Staphylococcus aureus-Popolation unter dem Einfluss mehrerer Antibiotika und interpretieren die Ergebnisse der Behandlung mit zwei Antibiotika in Folge. Als nächstes betrachten wir die Ausbreitung einer Popolation mit Phänotypen-Wechsel in einer räumlich strukturierten Umgebung. Diese besteht aus zwei Bereichen, in denen Wachstum möglich ist und einem Bereich mit Antibiotikum der die beiden trennt. Das dynamische Zusammenspiel von Wachstum, Tod und Migration von Zellen in den verschiedenen Bereichen führt zu unterschiedlichen Regimen der Populationsausbreitungsgeschwindigkeit als Funktion der Migrationsrate. Wir bestimmen die Region im Parameterraum der Phänotyp Schalt-und Migrationsraten, in der die Bedingungen Persistenz begünstigen. Darüber hinaus präsentieren wir ein erweitertes Modell, das Mutation aus den beiden phänotypischen Zuständen zu einem resistenten Zustand erlaubt. Wir stellen fest, dass die Anwesenheit persistenter Zellen die Wahrscheinlichkeit von resistenten Mutationen in einer Population erhöht. Mit diesem Modell, erklären wir die experimentell beobachtete Entstehung von Antibiotika- Resistenz in einer Staphylococcus aureus Popolation infolge einer Tobramycin Behandlung. Wir finden also verschiedene Funktionen bakterieller Persistenz. Sie unterstützt die räumliche Ausbreitung der Bakterien, die Entwicklung von Toleranz gegenüber mehreren Medikamenten und Entwicklung von Resistenz gegenüber Antibiotika. Unsere Beschreibung liefert eine theoretische Betrachtungsweise der Dynamik bakterieller Persistenz bei verschiedenen Bedingungen. Die Resultate könnten als Grundlage neuer Experimente und der Entwicklung neuer Strategien zur Ausmerzung persistenter Infekte dienen.
Guzmán, Alfredo. "Peru: population, dynamics and health". Universidad Peruana de Ciencias Aplicadas - UPC, 2007. http://hdl.handle.net/10757/272453.
Pełny tekst źródłaMilligan, Paul. "Population dynamics of African trypanosomiasis". Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306017.
Pełny tekst źródłaForrest, Michael Bruce. "Toxins and blowfly population dynamics". Thesis, University of Leicester, 1996. http://hdl.handle.net/2381/34346.
Pełny tekst źródłaSiriwardena, Pathiranage Lochana Pabakara. "STOCHASTIC MODELS IN POPULATION DYNAMICS". OpenSIUC, 2014. https://opensiuc.lib.siu.edu/dissertations/908.
Pełny tekst źródłaChoudhury, Md Abu Hasnat Zamil. "Population Dynamics of RNA viruses". Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/60866/1/Md._Choudhury_Thesis.pdf.
Pełny tekst źródłaWard, Eric John. "Incorporating model selection and decision analysis into population dynamics modeling /". Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/5319.
Pełny tekst źródłaKlenzendorf, Sybille A. "Population dynamics of Virginia's hunted black bear (Ursus americanus) population". Diss., Connect to this title online, 2002. http://scholar.lib.vt.edu/theses/available/etd-02122002-160752/.
Pełny tekst źródłaManokaran, N. "Population dynamics of tropical forest trees". Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 1988. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=59678.
Pełny tekst źródłaNickel, Anja Martina. "Population dynamics of Frankia in soil /". [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13731.
Pełny tekst źródłaBateman, Andrew Wade. "Population dynamics in meerkats, Suricata suricatta". Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/244662.
Pełny tekst źródłaWei, Hsin-Hua. "Population Dynamics of Central Place Foragers". Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28661.
Pełny tekst źródłaBonsall, Michael B. "Temporal and spatial insect population dynamics". Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406839.
Pełny tekst źródłaYeates, G. "Microbial population dynamics of the rhizosphere". Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334939.
Pełny tekst źródłaGreenberg, Daniel. "Population dynamics of a declining amphibian". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121577.
Pełny tekst źródłaAlors que le déclin de la population amphibienne mondiale est de plus en plus préoccupant, il est primordial d'identifier les facteurs qui en sont la cause. Puisqu'une certaine fluctuation de population est normale, il est difficile de déterminer si une variation donnée est naturelle ou symptomatique d'un déclin réel. Une meilleure compréhension des fluctuations de la population amphibienne pourrait servir à distinguer entre les facteurs naturels de variation et une altération de dynamique associée à un déclin. Voilà l'idée directrice de cette étude d'une espèce à risque, le crapaud de Fowler (Anaxyrus [=Bufo] fowleri) de Long Point en Ontario, dont la population semble diminuer graduellement. À partir de l'information recueillie sur deux décennies de marquage-recapture, j'ai examiné les facteurs, internes et externes, de variation de leur population. Au cours de la période, leur habitat de reproduction a été considérablement détérioré par la présence d'une espèce envahissante de roseau commun, le Phragmites australis. J'explore le lien entre cette altération de dynamique et le déclin progressif des crapauds de Fowler. Avant 2002, leur population était régulée par des facteurs internes comme la croissance en fonction de la densité et la mortalité hivernale. Depuis, les roseaux communs ont éliminé la plupart de l'habitat en eau libre des crapauds de Fowler, dont la population ne répond plus qu'à des facteurs externes d'influence, en particulier le niveau de l'eau du lac Érié. Ensuite, je cherche à voir si la présence de l'espèce envahissante a influencé, non seulement la quantité d'habitat de reproduction du crapaud de Fowler, mais aussi la qualité de ce qui reste, par la production de composés secondaires. L'hypothèse explorée est que les composés secondaires nuisibles aux branchies, produits autant par l'espèce envahissante Phragmites que par l'espèce native Typha, réduisent les chances de survie, la croissance et le développement des crapauds de Fowler, qui respirent nécessairement par leurs branchies. En toute logique, l'espèce sympatrique grenouille léopard du Nord (Lithobates [=Rana] pipiens), qui respire par ses branchies de façon facultative, devrait être affectée de façon similaire. Cependant, ce n'est pas le cas ; j'ai remarqué que les têtards de crapauds de Fowler n'étaient pas affectés par la présence de composés secondaires. De plus, c'est l'espèce native Typha qui semblait nuire à la croissance des crapauds de Fowler, plutôt que l'espèce envahissante Phragmites. J'en conclus que l'expansion de cette dernière peut influencer plusieurs espèces par une réduction de l'habitat disponible, mais pas par la détérioration de la qualité de son habitat larvaire. En étudiant le déclin amphibien à partir de la dynamique de population, nous pouvons améliorer notre capacité à établir des liens entre le déclin de populations d'espèces et les mécanismes qui y contribuent.
O'Hara, Robert Brian. "Population dynamics of cereal powdery mildews". Thesis, University of East Anglia, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320775.
Pełny tekst źródłaCOLOMBO, EDUARDO HENRIQUE FILIZZOLA. "SPATIAL PATTERN FORMATION IN POPULATION DYNAMICS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2014. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24777@1.
Pełny tekst źródłaCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
BOLSA NOTA 10
Motivado pela riqueza de fenômenos produzidos pelos seres vivos, este trabalho busca estudar a formação de padrões espaciais de populações biológicas. De um ponto de vista mesoscópico, definimos os processos básicos que podem ocorrer na dinâmica, construindo uma equação diferencial parcial para a evolução da distribuição da população. Essa equação incorpora duas generalizações de um modelo pre-existente para a dinâmica de um espécie, que leva em conta interações de longo alcance (não locais). A primeira generalização consiste em considerar que a difusão é não linear, isto é, é afetada pela densidade local de tal modo que o coeficiente de difusão segue uma lei de potência. Por outro lado, visto a alta complexidade envolvida na natureza dos parâmetros do modelo, introduzimos como segunda generalização parâmetros que flutuam no tempo. Idealizamos estas flutuações como um ruído descorrelacionado temporalmente e que obedece uma distribuição gaussiana (ruído branco). Para estudar o modelo resultante, utilizamos uma abordagem analítica e numérica. As ferramentas analíticas se baseiam na linearização da equação de evolução e portanto são aproximadas. Todavia, complementadas com resultados numéricos, conseguimos extrair conclusões relevantes. A não localidade das interações induz a formação de padrões. O alcance dessas interações é o que determina o modo dominante presente nos padrões. Assim, para valores dos parâmetros acima de um limiar crítico, emergem padrões. Analiticamente, mostramos que, mesmo abaixo desse limiar, as flutuações nos parâmetros podem induzir a aparição de ordem espacial. Os efeitos da difusão não-linear são captados superficialmente pela análise linear. Numericamente, mostraremos que sua presença modifica a forma dos padrões. Observamos, especialmente, a existência de uma transição quando alternamos entre o caso em que a difusão é facilitada por altas densidades e o caso oposto. Para o primeiro caso, verificamos que os padrões se tornam fragmentados, ou seja, a população é agora composta de sub-grupos desconectados.
Motivated by the richness of phenomena produced by living beings, this work aims to study the formation of spatial patterns in biological populations. From the mesoscopic point of view, we define the basic processes that may occur in the dynamics, building a partial differential equation for the evolution of the population distribution. This equation incorporates two generalizations of a pre-existing model for the dynamics of one species, which takes into account long-range (nonlocal) interactions. The first generalization is to consider that diffusion is nonlinear, i.e., it is affected by the local density such that the diffusion coeficient follows a power law. On the other hand, because of the high complexity involved in the nature of model parameters, we introduced as a second generalization time-fluctuating parameters. We idealize these fluctuations as Gaussian temporally uncorrelated (white) noises. To study the resulting model, we use an analytical and numerical approach. Analytical tools are based on the linearization of the evolution equation and are therefore approximate. However, as evidenced by numerical results, we draw important conclusions. The nonlocal feature of the interaction is the main mechanism which induces pattern formation. We show that the extent of these interactions is what characterizes the dominant mode. Thus, for parameter values above a critical threshold patterns emerge. Analytically, we also show that even below this threshold, fluctuations in the parameters can induce the appearance of spatial order. The effects of nonlinear diffusion are only superficially captured by the linear analysis. Numerically, we show that their presence modifies the patterns shape. We mainly observed the existence of a qualitative difference between the cases when diffusion is facilitated or not by high densities. In the first case, we note that the patterns become fragmented, that is, population becomes composed of disconnected clusters.
Jatuviriyapornchai, Watthanan. "Population dynamics and stochastic particle systems". Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/99427/.
Pełny tekst źródłaFasiolo, Matteo. "Statistical methods for complex population dynamics". Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687376.
Pełny tekst źródłaDai, Lei Ph D. Massachusetts Institute of Technology. "Spatio-temporal dynamics before population collapse". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/95869.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references.
Theory predicts that the approach of catastrophic thresholds in natural systems may result in an increasingly slow recovery from small perturbations, a phenomenon called critical slowing down. In this thesis, we used replicate laboratory populations of the budding yeast Saccharomyces cerevisiae for direct observation of critical slowing down in spatio-temporal dynamics before population collapse. In the first project, we mapped the bifurcation diagram experimentally and found that the populations became more vulnerable to disturbance closer to the tipping point. Fluctuations of population density increased in size and timescale near the tipping point, in agreement with the theory. In the second project, we used spatially extended yeast populations to evaluate early warning signals based on spatio-temporal fluctuations. We found that indicators based on fluctuations increased before collapse of connected populations; however, the magnitude of increase was smaller than that observed in isolated populations, as local variation is reduced by dispersal. Furthermore, we propose a generic indicator based on deterministic spatial patterns, recovery length. In our experiments, recovery length increased substantially before population collapse, suggesting that the spatial scale of recovery can provide a warning signal before tipping points in spatially extended systems. In the third project, we characterized how different environmental drivers influence the dynamics of yeast populations. We compared the performance of early warning signals across multiple deteriorating environments. We found that the varying performance is determined by how a system responds to changes in a specific driver, which can be captured by a relation between stability and resilience. Furthermore, we demonstrated that the positive correlation between stability and resilience, as the essential assumption of indicators based on critical slowing down, can break down when multiple environmental drivers are changed simultaneously.
by Lei Dai.
Ph. D.
Brett, Tobias Stefan. "Stochastic population dynamics with delay reactions". Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/stochastic-population-dynamics-with-delay-reactions(61982a13-b969-4d8d-904b-21c289c813f2).html.
Pełny tekst źródłaConstable, George William Albert. "Fast timescales in stochastic population dynamics". Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/fast-timescales-in-stochastic-population-dynamics(2e9cace8-e615-44ec-818e-26b96aaa6459).html.
Pełny tekst źródłaSundell, Janne. "Vole population dynamics : experiments on predation". Helsinki : University of Helsinki, 2002. http://ethesis.helsinki.fi/julkaisut/mat/ekolo/vk/sundell/.
Pełny tekst źródłaKlaoudatos, D. "Reproductive ecology, population genetics and population dynamics of selected Decapod crustaceans". Thesis, Swansea University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637807.
Pełny tekst źródłaHustin, Lucie. "Quantifying Haematopoietic Cell Dynamics". Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLS065.
Pełny tekst źródłaHaematopoiesis generates billions of mature blood cells daily. Over the years researchers focussed on studying this dynamic system and its underlying structure by characterising haematopoietic stem and progenitor cell (HSPC) function, its niche as well as its various differentiation lineages. While dynamics of mature cell production and HSPC turnover is extensively studied, less is known about the overall kinetic of cell production from HSPC to mature cells in health and diseases, in particular quantitative information are lacking.This sparsity in quantitative studies of the complete haematopoietic system can be explained by a lack of experimental tools as well as the challenge of establishing collaborations between labs with different expertise, such as haematology, immunology and theoretical labs in this context. Most studies often focussed either on the “top” or the “bottom” of the tree, or on models independent of experimental data. Overall, with the complexity of the system, the required theoretical knowledge and the paucity of experimental setups, undertaking such quantitative studies still remains challenging.The aim of this PhD is therefore to focus on quantitative questions about the haematopoietic tree kinetics combining both experimental and theoretical work. First of all, we will quantitatively review the hematopoietic system and derive quantities linked to haematopoiesis dynamics using published data. This work will 1) ease our understanding of this dynamic system and 2) provide a database of numbers to be used in future mathematical models. Second of all, we will use the current tools available such as cell tracer dyes, to describe the early differentiation fates of HSPCs and its link to cell division. Finally, we aim to develop a new experimental tool to quantify cell division, one of the major variables that is lacking to complete our quantitative understanding of haematopoiesis dynamics, and use it to study the average division of a cell population over time and fate decisions. In providing several quantifications of hematopoietic cell kinetics, this thesis aims to pave the way toward a more global and dynamical understanding of the cell fate landscape in hematopoiesis
黃道全 i Richard Huang. "Spatial variation in Cellana grata populations: the interplay of population dynamics and foodavailability". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31243125.
Pełny tekst źródłaHindle, Bethan J. "Unravelling the effects of environmental variation on the population dynamics of structured populations". Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/19466/.
Pełny tekst źródłaBishop, Jonathan R. B. "Embedding population dynamics in mark-recapture models". Thesis, St Andrews, 2009. http://hdl.handle.net/10023/718.
Pełny tekst źródłaGross, Thilo. "Population dynamics general results from local analysis /". [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972885455.
Pełny tekst źródłaRodríguez, Amor Daniel. "Population and evolutionary dynamics in spatial systems". Doctoral thesis, Universitat de Girona, 2013. http://hdl.handle.net/10803/128501.
Pełny tekst źródłaEls models físics i matemàtics són de gran utilitat a l'hora d'entendre processos clau en la dinàmica poblacional i evolutiva. Aquests models permeten l'estudi de característiques molt diverses dels sistemes espacials, com són la propagació de fronts, l'evolució de la densitat de població, les interaccions entre espècies (o individus), l'evolució d'estratègies, etc. Aquesta tesi presenta diversos models físics que descriuen sistemes espacials. El primer model estudia els efectes de l'estructura de la població en fronts invasius bidimensionals. Una expressió per la velocitat del front és derivada de les equacions per a poblacions estructurades. El segon model es consagra a l’estudi d’infeccions del Vesicular Stomatitis Virus. En aquest cas, s’utilitzen equacions de reacció-difusió per descriure les interaccions entre les poblacions de cèl·lules no infectades, cèl·lules infectades i virus. A l’últim model, el joc del Dilema del Presoner s'utilitza per estudiar l'evolució d'estratègies de cooperació i deserció
Arugaslan, Cincin Duygu. "Differential Equations With Discontinuities And Population Dynamics". Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610574/index.pdf.
Pełny tekst źródła#8722
equivalence of that system to an impulsive differential equation, Hopf bifurcation is investigated. Finally, the obtained results are extended to a 3-dimensional discontinuous system of Filippov type. After the existence of a center manifold is proved for the 3-dimensional system, a theorem on the bifurcation of periodic solutions is provided in the critical case. Illustrative examples and numerical simulations are presented to verify the theoretical results.
Kjellander, Petter. "Density dependence in roe deer population dynamics /". Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-5888-9.pdf.
Pełny tekst źródłaNaundorf, Björn. "Dynamics of Population Coding in the Cortex /". [S.l.] : [s.n.], 2005. http://www.gbv.de/dms/goettingen/502262788.pdf.
Pełny tekst źródłaDaukšte, Liene. "Mathematical Modelling of Cancer Cell Population Dynamics". Thesis, University of Canterbury. Mathematics and Statistics, 2012. http://hdl.handle.net/10092/9356.
Pełny tekst źródłaDaukste, Liene. "Mathematical Modelling of Cancer Cell Population Dynamics". Thesis, University of Canterbury. Department of Mathematics and Statistics, 2012. http://hdl.handle.net/10092/10057.
Pełny tekst źródłaSoja, Rachel Halina. "Dynamics of the Solar System Meteoroid Population". Thesis, University of Canterbury. Department of Physics and Astronomy, 2010. http://hdl.handle.net/10092/4305.
Pełny tekst źródłaSarafoglou, Nikias. "A contribution to population dynamics in space". Doctoral thesis, Umeå universitet, Institutionen för nationalekonomi, 1987. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-99835.
Pełny tekst źródłaDiss. Umeå : Umeå universitet, 1988
Digitalisering@umu
Lindh, Markus V. "Bacterioplankton population dynamics in a changing ocean". Doctoral thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-38712.
Pełny tekst źródłaHälften av all fotosyntes på vår planet utförs av växtplankton. De producerar organiskt material som utgör grunden för näringskedjan i havet. Ungefär hälften av det organiska material som produceras av växtplankton utnyttjas inte direkt, utan omsätts istället av bakterieplankton som lever och växer fritt i vattenmassan eller på olika partiklar. Bakterieplankton spelar därmed en nyckelroll i ekosystemet genom sin konsumtion av organiskt kol som för energi högre upp i näringskedjan. Trots deras nyckelroll i akvatiska miljöer vet vi fortfarande mycket lite om bakteriernas detaljerade säsongsmönster, mekanismer bakom rumsliga mönster och hur olika populationer kan komma att svara på klimatförändringar. Målet med denna avhandling var att undersöka hur specifika populationers dynamik och ekosystemfunktion påverkas av naturliga eller klimatorsakade förändringar i havsmiljön. Våra resultat av högupplöst säsongsbunden dynamik i Östersjöns bakteriesamhälle avslöjar en liknande bred uppdelning av ekologiska strategier inom varje större grupp av bakterier, både i relativ abundans och temporal fördelning. Utbredning i rum och tid av många lokalt ovanliga populationer jämfört med få lokalt vanliga populationer förklarades genom stokastisk variation i kolonisations- och utdöendehastigheter. Vidare tyder experimentella studier med tillsatser av olika kolkällor på att marina bakterier har olika ekologiska strategier, där populationer är specialister eller generalister i utnyttjandet av enskilda kolkällor. Med hjälp av experiment med naturliga bakteriesamhällen bekräftade vi tydliga temperatureffekter på bakteriesamhällets sammansättning, och en mindre effekt av lägre pH - som dock tillsammans med förhöjd temperatur bidrog till en tydlig synergistisk effekt på artsammansättningen. Ökad temperatur tillsammans med tillsats av terrestert kol gav också en stor effekt på bakteriesamhällets struktur och ekosystemfunktion och pekar på en potentiellt viktig påverkan av ökad framtida nederbörd och avrinning från vattendrag till havet. Samtliga tre experiment med fokus på klimatpåverkan bekräftade förekomsten av populationer som försvann eller minskade i relativ abundans vid klimatpåverkan (känslighet), medan andra var stabila (resistens). Samtidigt svarade många populationer positivt på klimatorsakade förändringar i havsmiljön och ökade i relativ abundans (respons) samtidigt som bakteriernas ekosystemfunktion påverkades positivt. Sammanfattningsvis visar denna avhandling att vissa nya bakteriepopulationer kan etablera sig och ersätta andra samtidigt som vissa befintliga populationer anpassar sin livsstrategi och ekologi till förändringar i havsmiljön. Vi visar också vikten av regionala effekter, d.v.s. kolonisation och utdöende, för bakteriesamhällets struktur, viktigt för tolkningen av biogeografiska mönster och den genomiska potentialen hos specifika populationer. Denna avhandling poängterar därmed betydelsen av att koppla studier av ekologiska mekanismer till både rumsliga och temporala spridningsmönster hos bakterier och till populationers kapacitet att svara på och anpassa sig till förändringar i havsmiljön.
Feakes, Karl Anthony. "The distribution and population dynamics of Corixidae". Thesis, University of Salford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308132.
Pełny tekst źródłaCalver, Andrew Robert. "Oligodendrocyte population dynamics : insights from transgenic mice". Thesis, University College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322239.
Pełny tekst źródłaReade, Brian. "The population dynamics of mixed pathogen infections". Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264017.
Pełny tekst źródłaPurves, Drew William. "Local spatial structure and plant population dynamics". Thesis, University of York, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251813.
Pełny tekst źródłaHoitzing, Hanne. "Controlling mitochondrial dynamics : population genetics and networks". Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/58020.
Pełny tekst źródłaStringell, Thomas Brian. "Population dynamics of marine turtles under harvest". Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14521.
Pełny tekst źródłaYing, Killian Ping-Hung. "Small area population dynamics in Hong Kong /". The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487262825075016.
Pełny tekst źródłaBierman, Stijn Martinus. "Spatio-temporal models in animal population dynamics". Thesis, University of Aberdeen, 2004. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU195633.
Pełny tekst źródłaChotibut, Thiparat. "Statistical Fluctuations in Evolutionary and Population Dynamics". Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493257.
Pełny tekst źródłaPhysics