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 31 for “"ecotones"”.
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Testing alternative stable state theory at Afromontane and Milkwood forest-fynbos ecotones
… framework within which to understand abrupt ecotones between two (or more) contrasting ecosystem configurations. ASS theory is more suited for explaining ecosystems that exist within the same abiotic conditions. In the Greater Cape Region, forest-fynbos ecotones are often juxtaposed in …
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Spruce bark beetle disturbance in the forest-tundra ecotones of southwest Yukon: impacts and predisposing factors
… that may have predisposed the forest-tundra ecotones of southwest Yukon to spruce bark beetle (Dendroctonus rufipennis) infestation, and investigated the subsequent effects of insect disturbance on the growth and establishment of white spruce (Picea glauca). Specific objectives were to …
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Dreamlands and Ecotones: How can a photographic language be constructed to explore the politics of landscape on the political equator?
This thesis is structured around a central overriding question: to what extent can the practice of landscape photography be used to make visible the politics of landscape in borderland territories? Introduced by architect Teddy Cruz, the ‘political equator’ suggests an alternative politics of space …
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Ecophysiology and Food Web Dynamics of Spring Ecotone Communities in the Edwards Aquifer, USA
Spring orifices serve as ecotones between groundwater and surface water habitats. It is thought that organisms living in physicochemically stable spring ecotones should exhibit small tolerance ranges; however, previous experiments examining this prediction are equivocal. I examined this hypothesis …
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Relationships of piñon juniper woodland expansion and climate trends in the Walker Basin, Nevada
… so aggregation to pertinent zones such as lowerecotones, upper ecotones, and main distribution of woodlands, allowed for meaningfulinferences of how the amount of change among climatic variables over time were relatedto densification of piñon juniper canopy.The Mann-Kendall test of trend is able …
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A gradient analysis of Coleogyne communities in Southern Nevada
… shared relatively broad upper and lower ecotones with Pinus-Juniperus and Larrea-Ambrosia vegetation, respectively. Lower Coleogyne ecotones generally had the highest species richness, and Pinus-Juniperus woodlands had the lowest species richness; Detrended correspondence analysis …
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Practices combining fire and grazing in the Central U.S. reduce woody encroachment and accommodate grassland and shrubland birds
… support grassland and shrubland birds in ecotones. Fire in combination with grazing controlled woody encroachment more than fire alone, and low amounts of woody cover in ecotones increased the abundance or occupancy of grassland and shrubland avian species. Overall, the ability of …
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Hybridization Between the Watersnakes <i>Nerodia sipedon</i> and <i>Nerodia fasciata,</i> in the Carolinas: A Morphological and Molecular Approach
… <em>N. sipedon</em> segregate ecologically along ecotones of salinity, temperature, and water current. Variation in the width of these ecotones is reflected in the width of hybrid zones.</p>
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Diversity patterns and conservation priorities in the "Mountains of Central Asia" biodiversity hotspot
… taxa closely associated with cropland–slope ecotones. In summer 2025, the cropland–slope ecotone was investigated in greater detail in a high-mountain valley. Habitat characteristics and species composition showed that subendemic species were concentrated in small-scale slope habitats rather …
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Effects of hurricanes and fires on southeastern savanna-forest landscapes
… likely in forests, and 3) they may influence ecotones between savannas and forests by changing species composition and structure. Based on predictions, I implemented an experimental study in savanna-forest ecotone to test hypotheses of interactive effects. I hypothesized that effects of …
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Spatial and temporal distribution of larval fishes in a large tidal river.
… assemblage. Tidal freshwater habitats may act as ecotones between marine and riverine ecosystems.
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Landscape Ecology of Birds on Mount Leconte, Great Smoky Mountains National Park
… and composition of deciduous-coniferous ecotones influenced diversity, richness, and relative abundance of bird species and how bird species responded to the spruce-fir community.</p> <p>Using a form of the variable-circular plot method, I conducted audio-visual censuses of diurnal birds …
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A Dendrochronological Analysis of Vegetation Change and Climate History in Two Southern Appalachian Balds, Craggy Gardens and Big Bald, NC
… North Carolina (high elevation forest-grass ecotones). Results indicate that historical grazing and land management have been responsible for vegetation changes at Craggy Gardens, in particular the advancement of Quercus rubra L. into the grass bald. Dendrochronological analyses showed that …
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Landscape-Scale Variability in the Composition, Growth and Pattern of Alpine Treeline Vegetation
… and resulted in relatively abrupt treeline ecotones. Trends in tree growth and the degree of clustering between tree stems varied between mountain ranges with different slope angles. Rapid spring runoff in steep valleys likely caused a spring soil moisture deficit that curbed tree growth …
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Combined effects of warming and drying on a temperate-to-boreal forest ecotone exert additive changes on soil microbiome structure and diversity
… zones such as the temperate-to-boreal forest ecotones, which are poised to experience substantial changes under projected climate change over the next century and beyond. Because these systems are projected to move towards a warmer, drier climate, it is important to understand how the soil …
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Unfolding the unexpectedness of uncertainty : arts research as a triptych installation : a conversation of processes, practices, products
… arts research as customary methodological ecotones? Based on this study, a number of key issues are illuminated concerning teacher education. The reconceptualization of teacher education in terms of health and well-being is critical. Emphasis on geographies of self and the evolution of …
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A reassessment of the conservation status of a rare Florida endemic mint, Macbridea alba
… the panhandle, associated with transitional ecotones, sensitive to changes in vegetation and dependent on fire disturbance, and despite the viability of seed, could be recruitment or seed limited due to low fruit and seed set across populations. The new findings and updated data can form a …
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Holocene variations in summer temperature and effective moisture: Understanding the causes of vegetational dynamics in Alaska
… of spring moisture limitation to forest-tundra ecotones and suggests that moisture played an important role in determining the position of the Alaskan forest-tundra ecotone throughout the Holocene.
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Geospatial Variation of an Invasive Forest Disease and the Effects on Treeline Dynamics in the Rocky Mountains
… of invasive disease on sensitive treeline ecotones dependent on a keystone species.
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