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 25 for “"ecosystem changes"”.
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Community and ecosystem changes in tallgrass prairie restorations: the effects of population source and diversity
… of propagules on community structure and ecosystem function during prairie restoration. Two field experiments, and two chronosequences were used to investigate this main objective. The two field experiments were established at the same latitude separated by 620 km (corresponding to a …
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Swimming sentinels : climate clues from stranded marine mammals
… complicated- influenced by disease, biotoxins, ecosystem changes, and human interaction-that their cause can appear impossible to untangle. Yet a growing body of evidence strongly suggests that climate change has a hand in them all. This thesis examines marine mammal stranding events of the past …
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Application of the sequential t-test algorithm for analysing regime shifts to the southern Benguela ecosystem
Long-term ecosystem changes, such as regime shifts, have occurred in several marine ecosystems worldwide. Multivariate statistical methods have been used to detect such changes, but they have to date not been applied to the southern Benguela ecosystem. A weakness of many of the methods is that they …
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Modelling the Baltic Sea food web with a Dynamic Bayesian Network with hidden variables
Protection of the functioning of ecosystems requires understanding of the ecological processes, which, however, are highly complex on multiple spatial and temporal scales. This complexity is a major challenge for modellers, particularly as ecological data are often scarce, and ecosystems are known …
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The Consequences of Non-Native Species Invasions on the Contemporary and Historic Trophic Ecology of Native Sport Fish in a Lake Michigan Embayment
… in nearshore benthic habitats. Despite these ecosystem changes, little is known about their influence on resource partitioning in nearshore fish communities. Here we use stable isotope analysis to characterize the contemporary fish community and historic walleye (<em>Sander vitreus</em>) …
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Toward a More Integrative Approach to Quantifying the Ecological Impacts of Invasive Plants
… for the health and functioning of native ecosystems. In response, identification of invasive plant impacts are one of the top most studied aspects of plant invasions. Yet we still know very little about invasive plant impacts, and many land managers remove invasive plants not because of …
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High-Resolution In Situ Oxygen-Argon Studies of Surface Biological and Physical Processes in the Polar Oceans
… the planet and are undergoing rapid climate and ecosystem changes. Until we can fully resolve the coupling between biological and physical processes we cannot predict how warming will influence carbon cycling and ecosystem function and structure in these sensitive and climactically important …
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Characterizing the ecology of coral reef microorganisms across different scales within the Caribbean
… of the most diverse, valuable, and threatened ecosystems on Earth. Despite the importance of reef microorganisms, there is a lack of understanding about their ecology, especially on Caribbean reefs. Furthermore, the hastening degradation of reefs due to anthropogenic stressors has made it …
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Striped Bass and Summer Flounder Population Dynamics in the Chesapeake Bay: an Ecosystem Based Evaluation
… Striped bass and summer flounder have exhibited changes in abundance over recent years within the Chesapeake Bay. There is a lack of understanding of how environmental factors may be impacting striped bass and summer flounder abundance and how other species may be responding to these …
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An Ancient Genomic Perspective of Kinship, Disease and Environment
… can potentially in luence and be in luenced by ecosystem changes. This demonstrates the considerable potential for this approach to reveal how humans and other species depended on key ecological relationships through time, using Bayesian network analysis. Another major determinant of human …
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Architecting a Corporate Venture Capital Firm for a Commodity Enterprise
… on their cost per unit of production. However, changes within the ecosystem for commodity enterprises are impacting the competitive landscape, leading to a need for enterprise transformation. These ecosystem changes include a growing focus on an enterprise’s environmental impact and a reduction …
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Clean water: a long-term water quality monitoring network to evaluate restoration of Hickory Run at the Mt. Cuba Center
… and reasonable connections can be drawn between ecosystem changes and their effects on potential pollutants and water quality conditions. Additionally, research has recently been published on quantifying the ecosystem services of native versus exotic plant species, and while certain information …
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Data archiving, management initiatives and expertise in the Biological Sciences Department, University of Cape Town
… Department as researchers wish to understand ecosystem changes such as climate change, the spread of alien species and the impact of humans on land and marine exploitation. It is consequently critical that research data, past and present are properly managed for future research so that …
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Modelling regime shifts in the southern Benguela : a frame-based approach
… small pelagic species in the southern Benguela ecosystem, which has been shown to have undergone regime shifts during the past 50 years. Modelling regime shifts at an ecosystem scale can be of great importance in fisheries management, to aid in long-term planning and fishing strategy evaluation. …
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Assessing the effects of internal (trophic structure) and external (fishing and environment) forcing factors on fisheries off central Chile : basis for an ecosystem approach to management
… concern on the degraded state of fish stocks and ecosystems. Accordingly, fisheries science and management are expanding from the traditional single-species approach towards an ecosystem approach to fisheries. Marine communities are organized as webs of interactions that are affected by external …
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Microbiome-centered Approaches to Marine Disturbance Ecology
… climate change continues to alter our global ecosystem, ecological disturbances will increase in both frequency and intensity. These ecological disturbances have been shown to significantly impact microbial communities, often altering composition and/or function. However, while disturbance …
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Developing Critical Loads and Dynamic Critical Loads for Acidification for Watersheds in the Adirondack region of New York and Great Smoky Mountain National Park (GRSM)
… (DCLs) are important tools for the management of ecosystems that are impacted by high sulfate, nitrate and ammonium deposition. In this study, a biogeochemical model (PnET-BGC) was applied to 20 watersheds in the Adirondack region and 12 watersheds in Great Smoky Mountain National Park (GRSM) to …
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Methane distribution and oxidation across aquatic interfaces
… involving marine, freshwater and terrestrial ecosystems. Thus, aquatic systems have a high potential to translate local or regional environmental and subsequently ecosystem changes to a bigger scale. Many studies neglect this connectivity and focus on individual aquatic or terrestrial …
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Novel disturbance regimes in the Arctic: paleoecological perspectives on fire and thermo-erosion from Alaskan tundra
… disturbance regimes may result in more rapid ecosystem changes in the Arctic compared to warming alone. However, the paucity of observational data from remote tundra ecoregions, spatial heterogeneity of ground-ice deposits, and rare burning in many tundra ecoregions at present limits our …
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