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 20 for “"community stability"”.
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Costs and benefits of Daphnia antipredator behavior and consequences on community stability
… defenses and to study their implications for community stability, I used the planktivorous fish - Chaoborus - Daphnia system. In the laboratory, I found that clonal variance of Daphnia antipredator defenses was high, and that behavioral, morphological, and life-history defenses were uncoupled. …
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Rational Corporate Risk Management Policy: An Extension of Traditional Risk Management Theory to Incorporate Observed Managerial Behavior
… cost and availability of capital, employee/community stability, and the increases in bankruptcy costs that these risk management deviation are in the interest of shareholders. When considered in the context of the long-term impact on value, the observed deviations from received corporate …
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Influence of synthetic mustelid semiochemicals on population dynamics of the deer mouse
… impact on deer mice (a non-target species). Community stability would be maintained with this relatively species-specific biological control method.
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The structure and stability of ecological networks
… individual species and (ii) the structure of the community as a whole in a single framework amenable to mathematical and computational analysis. In this thesis I consider a number of outstanding problems in network ecology. In Chapter 1, I examine the consequences for network structure of removing …
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Mathematical Modelling of Emergent Survival in Microbial Communities
… complex interaction networks that determine community stability, invasion success, and resilience to external perturbations. The concept of emergence – where community-level behaviours and properties arise from interactions among individual member species – has proven essential for …
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Amenities, Walkability, and Neighborhood Stability: A Mixed Methods Analysis
… purposes of this study, urban and neighborhood stability are positive terms used to describe a host of economic and community outcomes. The dissertation examines stability at the city and neighborhood scale through a longitudinal, mixed methods study, which includes multiple regression analysis, …
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Characterization of Vascular Plant Species Composition and Relative Abundance in Southern Appalachian Mixed-Oak Forests
Eight study sites were established in mid-elevation, south aspect, mixed-oak forests in the Ridge and Valley and Allegheny Mountain physiographic provinces of Southwestern Virginia and West Virginia to address questions concerning the variability in species composition, richness, and relative …
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Surviving risk: the translational labor of community violence intervention workers in service to labeled lives
This study examines how community violence intervention (CVI) program workers and clients navigate risk, institutional expectations, and lived survival. While most CVI research evaluates reductions in violent crime or changes in individual-level risk factors, less attention has been given to the …
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Multi-faceted analyses of plant-pollinator interactions: From ecological communities to individual foraging decisions
… interactions it has with the rest of its community and environment. Therefore, it is crucial to understand how behavior and species interactions influence ecosystems at multiple scales – from ecosystem functions to individual decisions. I provided evidence from the literature on the …
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Nutrient enrichment modulates the structure and temporal assembly of riverine benthic algal and macroinvertebrate assemblage.
… alteration of nutrient regimes can affect community stability by changing the dominant mode of seasonal succession. I examined how enrichment changed the distribution of species among study sites, and found algal assemblage structure displayed sharp, non-linear changes in response to TP …
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Impacts of shared pollinators and community composition on plant-pollinator interactions and their fitness consequences
… parasitism, and mutualism—are fundamental to the stability of ecological communities and drive the evolution of species they contain. Some mutualistic systems consist of mutually dependent partners that strongly influence each other’s survival, while other mutualistic systems consist of many, …
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COEXISTENCE, RESILIENCE AND RESISTANCE OF MARINE INVERTEBRATE COMMUNITIES ACROSS A LATITUDINAL GRADIENT
… underlying the patterns of species diversity and community structure across biogeographical scales is therefore vital, especially as humans increasingly modify these relationships established over the course of geological history. The latitudinal diversity gradient is the most well-established and …
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Diversity, variability and persistence elements for a non-equilibrium theory of eco-evolutionary dynamics
… of traits that span from the individual to the community, and from the ecological to the evolutionary scenarios. How these internal characteristics operate to allow living beings to cope with the uncertainty present in their environments is the subject matter of quantitative theoretical ecology. …
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Why it takes all kinds: diversity mechanisms and patterns in ecological communities
… the effect of diversity of individuals on a community. The mechanisms generating diversity are explored, their effects on patterns of diversity are examined, and the impact of diversity on community properties (such as productivity and stability) is investigated. Three individual-based models …
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Consequences of interaction between the native ant community and an invasive plant (Euphorbia esula)
… (+/+), play a key role in ecological community functioning, influencing community stability and biological diversity. Despite their importance in ecological processes, the study of mutualism has limitations. First, seemingly positive interactions are often considered mutualisms without …
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Community structure and function of mixed microalgal communities for nutrient recovery and the selection of lipid and carbohydrate accumulators for enhanced feedstock production in wastewater treatment
… empirically and suffer from unpredictable community dynamics that hinder performance. In order to create engineered systems that experience reliable and predictive behavior, there is a critical need to understand how design and operational parameters influence community structure, nutrient, …
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Effects of the antibiotic tetracycline on the honey bee gut microbiome
… is a relatively simple host-associated community that makes an excellent model system for studying microbiome stability. In addition, honey bees are essential agricultural pollinators, so factors that impact their health are important for food security. The presented research focused on …
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Comparative analysis of meiobenthic diversity across habitats in ancient lakes
… a diverse array of ecological functions and community structures. Lake ecosystems, in particular, exhibit a high degree of species richness and ecological complexity. Ancient lakes such as Lake Ohrid in Europe, Lake Baikal in Asia, and Lake Malawi in Africa stand out for their exceptional …
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Mechanistic underpinnings of lacustrine brGDGT production, and proteomic vertebrate taxonomic identification of phrynosomatid lizards and arvicoline rodents
… geologic or climatic shifts may have influenced community stability or change. Understanding how environmental variables have influenced biotic change in the past gives researchers tools to determine conservation strategies and mediate impacts on biotic communities in the face of irreversible and …
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When do propagules matter? The role of ecological filters and regeneration dynamics during community assembly in tallgrass prairie restorations
… composition and contribution of propagules for community regeneration in degraded environments. Three studies were conducted to elucidate the role of regeneration dynamics and dominant species on community assembly during tallgrass prairie restoration. In the first study, patterns in the …