Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Migratory behaviour"”.
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The Gut Microbiome and its Relationship to Migratory Behaviour and Fate in Wild Fishes
… contribute to host health and fitness. Wild, migratory species offer a unique opportunity to examine the gut microbiome under an additional layer of complexity. Changing external environments, compounded by migration-associated physiological changes in the host, may be associated with …
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The energetic and demographic payoffs of reindeer (Rangifer tarandus) migration in Norway
Migratory behaviour has been hypothesized to be driven by fitness benefits arising from environmental factors that vary spatially at the landscape scale and temporally on an annual cycle. If migration has a fitness payoff, it follows that barriers to migration may have a measurable demographic …
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The spatial scale of adaptive population differentiation in Atlantic Salmon: local adaptation in smolt migration timing
… there is evidence for local adaptation in migratory behaviour of Atlantic salmon. Specifically, it aims to examine variation in the timing of smolt migration among independent tributaries of single river systems and to screen individual fish for molecular genetic variation at neutral …
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Winter vertical migration of Arctic zooplankton
… the Arctic Ocean. However, the drivers of this behaviour during an apparent lack of illumination and food are poorly understood, as is its spatial extent across the Arctic Ocean. A novel dataset comprising 58 deployments of moored Acoustic Doppler Current Profilers is used in this study to …
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Effects of Pan-I genotype and family cross on oxygen consumption rate among juvenile Atlantic Cod (Gadus morhua)
… cod has been proved to be adapted genotypic and behavioural to different environmental temperatures. We compared the oxygen consumption rate (VO2/M) of juvenile Atlantic cod from both different family crosses and with different Pan-I genotypes acclimated to 4ºC, 8ºC and 12ºC and when exposed to …
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Inflammation and neutrophil recruitment in ageing subjects and patients with chronic obstructive pulmonary disease
… to inflamed tissue. It is unclear which migratory stimuli are important and whether COPD neutrophils vary in their migratory behaviour, either to controls or patients with similar lung disease. COPD sputum and plasma samples were collected on 11 occasions over one month. Significant …
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Aligned selection in cold climates breaks the rules of trade-offs in adaptation
… of thermal divergence (coldward vs warmward), migratory behaviour and ranges, the age and body size of the pair, and the temperature at which species experience divergent temperatures. Overall, we found that trade-offs are widespread under some conditions, including among pairs experiencing …
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Modelling migration and aggregation: Applications in fisheries, environmental change, and evolution
… change. Many species exhibit seasonal migratory homing behaviour to and from spawning grounds. In this thesis, models are developed to explore the consequences of migratory behaviour and spatial structure on fisheries management and responses to environmental change. Initially, a simple …
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Chromosomal inversions as a mechanism for sympatric differentiation in common quails
… (AA, AB, BB) that differ in morphology and migratory behaviour while still coexisting and interbreeding in parts of the western Palearctic. This thesis assess how this rearrangement shapes population processes and contributes to divergence in sympatry. In Chapter 1, quails wintering in …
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Multi-isotope analysis and the reconstruction of prey species palaeomigrations and palaeoecology
… faunal movements, and to discern ranging behaviours from true migrations. d34S values of bone collagen compliment enamel 87Sr/86Sr data in the same individuals, and suggest the use of this approach for the identification of geographical origin.d13C and d15N from sequentially-sampled …
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Testing of a standardised protocol for visual health assessment of southern right whales (Eubalaena australis)
… recovery. As reproductive success and the migratory behaviour of this capital breeder is strongly mediated through body condition and overall health, understanding the past and current state of these parameters is crucial in understanding the observed population-level changes. The aim of …
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Cell cycle perspectives on breast cancer cell behaviour
… indicated that infiltrative tumour cell behaviour might be counteracted by a high proliferative activity, suggesting a coordination of these two activities at the cellular level. Here we studied the potential relation between proliferative activity and migratory behaviour in breast …
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Investigations of collective cell movement during gastrulation in the chick embryo
… of potential chemoattractants and assess their migratory behaviour in real-time. We established an in vitro assay that enables the isolation of the cells from the embryo with minimal damage and their preservation in serum-free conditions. We then used the Dunn chemotaxis chamber to expose the …
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Evaluating occupancy and the range dynamics of invasive bird species in South Africa
… of the closure assumption potentially caused by migratory behaviour. The results are limited by the presence of a potentially migratory species when using a poorly designed study and highlights the difficulties of conducting an occupancy analysis on a highly mobile avian species as opposed to …
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Aspects of the ecology of migrant shorebirds (Aves: Charadrii) at the Berg River estuary, South Africa
… of the estuary for Palearctic-breeding migratory waders and to identify the factors affecting their distribution, abundance and behavioural patterns. The findings were related to the dispersion patterns of waders on the east Atlantic seaboard, and their significance was evaluated in the …
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Role of multicellular organisation in mesoderm differentiation
… adhesion, an increase in cell clustering and migratory behaviour, and changes in cell shape associated with differentiation into mesodermal and endodermal derivatives. Primitive streak formation and gastrulation are orchestrated by Nodal, BMP, Wnt and Fgf signalling pathway activity. However, …
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Physical Factors Regulating Human Trophoblast Invasion
… is known to regulate cell fate and the migratory behaviour of cells. Despite invasion of EVT cells through decidual tissue rich in extracellular matrix (ECM) proteins, there has been no study investigating how tissue stiffness might regulate EVT invasion. Oxygen has also long been …
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The interaction between migration and disease in the Fall Armyworm, 'Spodoptera frugiperda'
… Yet we know very little about the complex migratory movements of these tiny animal migrants and less still about what causes their populations to fluctuate in space and time. Understanding the reason for these population level changes is important, especially for insect species that are …
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Flight feather moult patterns and stable isotope analysis in the Woodland Kingfisher
… be expanded for use on other intra-African migratory bird species because the migratory behaviour of most intra-African migrants still remains unknown.
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Novel signalling pathways resolving the inflammatory response during peripheral nerve regeneration
… data sets and can induce contact dependent migratory behaviour within cells. EphA5-EphrinA signalling as a potential mechanism to induce macrophage migration and efflux out of the peripheral nerve was investigated. Methods. This project uses a combination of in vitro, ex vivo and in vivo …
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