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 40 for “"Nutrient cycles"”.
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Nutrient cycles across topography in drainage-impaired Corn Belt soils
Greenhouse gas emissions and nutrient leaching from Corn Belt soils pose a threat to both local and global human and environmental health. Topographic depressions in the US Corn Belt have documented impacts on hydrology, crop production, soil characteristics, and soil microbial communities. These …
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No life without death: Scavengers enhance nutrient cycles via carcass decomposition
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The role of dissolved gas fluxes on the biogeochemical evolution of nutrient cycles in lakes.
… literature about the coupling of biogeochemical cycles, as the interactions of dissolved gases between the water column, sediment, and atmosphere are important for determining the dynamics of an ecosystem.
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Consumer nutrient stoichiometry : patterns, homeostasis, and links with fitness.
The linkages between food webs and nutrient cycles are heterogeneous and often influenced by human activities. Ecological stoichiometry provides one framework for understanding and predicting these linkages. Yet, as it has been extended underlying assumptions are often not evaluated. This …
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Ghost Forests of the Mid-Atlantic : how sea-level rise is killing our coastlines
… arise for local flora and fauna, natural nutrient cycles, and coastal communities.
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Spatial heterogeneity in isotope and biomarker distributions : insights from the End-Devonian OAE in Western Canada.
The availability of essential nutrients, such as nitrogen, phosphorus, and trace elements, fundamentally influences biological production. This is especially critical in tropical regions where stable thermal stratification in the water column is periodically disrupted by surface ocean current …
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INVESTIGATING THE CONTRIBUTION OF MARINE VIRUSES TO OPTICAL BACKSCATTER IN THE <0.2 µM FRACTION OF SEAWATER
… viruses play a significant role in carbon and nutrient cycles through the liberation of dissolved organic matter (DOM) through the lysis of their numerically dominant hosts (i.e. bacteria and phytoplankton). Despite their importance, little is known about how viruses contribute to seawaters …
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Consequences of nutrient enrichment for soil organic matter cycling in grasslands
… activities have increased the availability of nutrients, such as nitrogen (N), phosphorus (P), and potassium (K), worldwide. Since alterations to nutrient cycles influence carbon (C) fixation and decomposition processes, nutrient enrichment affects global C stocks -- such as soil C. Carbon in …
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Where the Zigzags go: a microhabitat analysis for the Plethodon dorsalis complex within the Tennessee River gorge
… dorsalis) are known contributors to essential nutrient cycles within their respective habitats. Knowing that these sensitive creatures serve as bioindicators for the overall health and quality of many ecosystems, we should aim to comprehend their habitat requirements. Doing so could ultimately …
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Near-surface hydrology and hydrochemistry under contrasting land-cover
… an in-depth understanding of the water and nutrient cycle. On this basis we compared the involved hydrological pathways for rainfall to reach streams and the nutrient budgets of a tropical rainforest and a pasture. In addition we studied the links of hydrochemical differences to differences …
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Vegetative and reproductive biomass allocation responses of herbaceous plant species to induced drought in a semi–arid highland savanna, central, Namibia
… fodder, and food sources while disrupting nutrient cycles. This study investigated herbaceous drought responses in biomass allocation and the influence of environmental variables on these patterns, aiming to inform ecosystem management to conserve Namibia's biodiversity. Twenty fixed …
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Changes in Water Quality as Related to Retention Time Within Red Rock Reservoir, Iowa, Summer 1972
… sulfate values. Conclusions. The existing high nutrient levels indicate that Red Rock is a productive lake during the summer, however the high flushing rate could prevent the development of plankton populations and retard further eutrophication. Recommendations. Further work involving nutrient …
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Organic matter remineralization in coastal sediments in and around Kane‘ohe Bay, Hawaiʻi
Nutrient cycles in shallow, near shore environments can be profoundly influenced by sediments, via the burial or release of nutrients through organic matter (OM) remineralization during diagenesis. The decomposition and burial of OM in sediments are key processes influencing biogeochemical cycles …
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Utilising Chlorophyll Fluorescence to Assess the Variability of Phytoplankton Biomass and Productivity in the North-West European Shelf Seas
… marine ecosystem services such as biogeochemical nutrient cycles and fisheries. Therefore, the ability to accurately quantify and predict the environmental influences that govern this process is of paramount importance. Through surveying and experimental approaches, I investigated the variability …
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Phosphate-mineral interactions and potential consequences for nutrient cycling
Biogeochemical cycling of phosphate is a key component in the overall production rate of coastal ecosystems. Mineral phases in the near-shore sediments play a significant role in the return of phosphate remineralized in the upper sediments to the water column. Sequential Extraction (SEDEX) of the …
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Nutrient limitation dynamics of a coastal Cape Cod pond : seasonal trends in alkaline phosphatase activity
… activity (APA) were utilized in tandem as nutrient deficiency indicators (NDIs) for phytoplankton. The study objective was to evaluate the limiting nutrient status of the pond throughout the growing season. The development of a high throughput method for fluorometrically measuring APA …
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Protein regulation in Trichodesmium and other marine bacteria: observational and interpretive biomarkers of biogeochemical processes
… mediating chemical transformations and linking nutrient cycles to one another. A major goal in oceanography is to predict the activity of marine microbes across disparate ocean ecosystems. Towards this end, molecular biomarkers are important tools in chemical oceanography because they allow for …
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Controls on nitrogen fixation and nitrogen release in a diazotrophic endosymbiont of shipworms
… indicates that there are potentially complex nutrient cycles in this symbiosis, which have not been investigated. We used the cultivated symbiont Teredinibacter turnerae, which has been isolated from many shipworm species, as a model organism to elucidate controls on N2-fixation and N release …
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The large scale understanding of natural organic matter : processes and application
Natural biogeochemical cycles of the macronutrient elements carbon (C), nitrogen (N) and phosphorus (P) have been transformed by food and fuel production, through atmospheric pollution and climate change. Further, land disturbance has led to considerable losses of nutrients from terrestrial …
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Advancing sustainable wastewater treatment: elucidating tradeoffs among emerging resource recovery technologies through quantitative sustainable design
… environment through biodiversity loss, altering nutrient cycles, and increases in severe weather events. These impacts are subsequently hindering the ability of wastewater treatment plants (WWTPs) to protect human and environmental health. In addition, the field of wastewater engineering is …
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