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 17 of 17 for “"Niche construction"”.
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Niche construction and plant-use in the Mesolithic
… Mesolithic people actively constructed their own niches through the use and possible management of wild plants, and by creating and maintaining woodland clearances to increase their control over animal and plant resources. Recently, it was suggested that Mesolithic people in Ireland may have …
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Adaptation and niche construction by Pseudomonas fluorescens SBW25
… the original environment to establish two new niches corresponding to a high-O<sub>2</sub> region at the A-L interface and a low-O<sub>2</sub> region lower down the liquid column. Greater O<sub>2</sub> availability at the A-L interface was found to provide the selective pressure driving the …
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Social niche construction: evolutionary explanations for cooperative group formation
… a positive feedback process that we call social niche construction.<br/><br/>We argue that this process is necessary in providing an adaptive explanation for some of the major transitions in evolution (such as from single- to multi- celled organisms, and from solitary insects to eusocial …
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A mathematical analysis of evolutionary rescue and niche construction
… a less explored possibility---known as positive niche construction (hereafter niche construction)---involves mutants improving their fitness by modifying their environment. In Chapter 1 of this dissertation, I analyze a model of evolutionary rescue via a niche-constructing mutation. I show that …
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Biogeochemical niche construction in the forest-fynbos mosaic of Jonkershoek Nature Reserve, South Africa
… vegetation is responsible for modifying its niche increasing the difference between fynbos and forest patches.
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An Archaeobotanical Contribution to Foodways, Wood Collecting Strategies, and Niche Construction at the Late and Terminal Archaic Site of Côte Rouge in Southern Québec
This thesis illustrates the varied contributions of archaeobotany to our understanding of precontact groups in southern Québec, using the site of Côte Rouge (CeEt-481 and CeEt-211) as a case study. This location has been known to First Nations since at least the Late Paleoindian period (11 200-9500 …
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Modelling spatio-temporal changes in the ecological niches of major domesticated crops in China: Application of Species Distribution Modelling
… of crops in the past related to their ecological niches. In particular, it presents the niche models for five historically significant crops in China: rice, millet, wheat, barley and buckwheat. These models are rooted in the Species Distribution Modelling (SDM) methodology and infer the potential …
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Diversity and evolution of ecosystems: From genomes to the biosphere
… why many competitors can coexist in a single niche. The original KtW model is deterministic and expressed in terms of continuous biomass concentrations, and appears to predict the coexistence of species. Here I present a stochastic individual-level model for the KtW paradigm, representing …
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Life history implications of the mother's choice for a larval habitat. Niche choice and niche conformance in the fire salamander, Salamandra salamandra
… Amphibians might shift to different habitats or niches (niche choice), adjust their phenotype to match the given habitat (niche conformance) or change the environment to match their phenotype (niche construction). This research aims to investigate niche choice and niche conformance in the …
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Marine Resource Specialization in Viking Age Iceland: Exploitation of Seabirds and Fish on Hegranes in Skagafjörður
… in Iceland provided for themselves through niche construction activities that included landscape domestication, animal husbandry, bird hunting, and fishing. It also looks at the zooarchaeological indicators of household autonomy to understand the early social and political landscape in …
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The evolution of shelter: ecology and ethology of chimpanzee nest building
… ecosystem engineering is a consequence of animal construction, from ants to humans. I investigated use-wear traces around nests to assess niche construction of nest- building. I showed that chimpanzees repeatedly re-used these specific nest-spots within trees, which are pre-fabricated for future …
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Human behavioural dynamics in island rainforests: evidence from the Raja Ampat Islands, West Papua
… improvise social and technical behaviours, while niche constructing tendencies enabled them to reshape their ecologies. However, the rate and scale at which humans could transform their behaviours and environments in the deep past remains unclear. This thesis explores how humans came to frequent …
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Considering the importance of wetlands to hunter-gatherer adaptation : a microbotanical investigation of Late Pleistocene plant-use in the Eastern Levant
… based in Historical Ecology and Human Niche Construction (HNC), this dissertation recognizes that Late Pleistocene hunter-gatherers did not just react to their environments, but created and modified their environments. This research critically reconsiders the way we see hunter-gatherers …
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Traditional Marine Management Systems in Northwest California: The Archaeology and Implications of Indigenous Stewardship Practices for Modern Marine Conservation and Restoration
… California's Lost Coast through the lens of Niche Construction Theory, by investigating specific settlement-subsistence strategies, socio-economic relationships, and marine stewardship practices that sustained or enhanced coastal productivity, promoting cultural resilience during periods of …
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Costs and benefits of host use by brood parasitic birds
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Environmental Stress Can Favor Cooperation by Triggering an Adaptive Race Between Cooperators and Cheaters
… this phenomenon is due to a process called “niche-hiking”: Isolated cooperators, by creating an environment suitable for growth, may sample more beneficial mutations in the stressful environment than isolated cheaters, which cannot grow. The deleterious cooperative phenotype can thus …
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From Genes to Traits and Ecosystems: Evolutionary Ecology of <i>Sphagnum</i> (Peat Moss)
… trait variation is hypothesized to promote niche differentiation through the creation and maintenance of ecological gradients along which species sort within communities. One prominent gradient relates to height-above-water-table wherein some species produce hummocks raised up to a meter …