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 33 for “"McMurdo"”.
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Lacustrine biogeochemistry of the McMurdo Dry Valleys, Antarctica.
Lacustrine biogeochemistry of the McMurdo Dry Valleys, Antarctica.
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Microbial Mat Abundance and Activity in the McMurdo Dry Valleys, Antarctica
… suited to remote environments, such as in the McMurdo Dry Valleys (MDV) of Antarctica, where cyanobacterial communities are the main drivers of primary production. These microbial communities form multi-layered sheets (i.e., microbial mats) on top of desert pavement. The cryptic nature of these …
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The impacts of thermokarst activity on a stream in the McMurdo Dry Valleys
The McMurdo Dry Valleys (MDV) of Antarctica are a unique ice-free landscape that is host to vibrant ecosystems despite the harsh environment (<10 cm water equivalent/yr, -20°C mean air temperature). Aquatic ecosystems in the MDV are dependent on the ephemeral glacial runoff streams which feed the …
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Characterisation of microbial Mat communities in meltwater ponds of the McMurdo ice shelf, Antarctica
… ponds Fresh, Orange and Salt Ponds on the McMurdo Ice Shelf, near Bratina Island, Antarctica. These sites were chosen because of the ecological importance and absence of detailed characterisations of their diversity and function as part of Antarctica's largest wetland. Particular focus was …
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Controls over the distribution of soil micro-invertebrates in the McMurdo Dry Valleys, Antarctica
The McMurdo Dry Valleys of Antarctica are a cold desert ecosystem where soil micro-invertebrate communities are shaped by extreme abiotic conditions, particularly low soil moisture, organic carbon availability, and high salinity. In this thesis I combine long-term ecological data with spatial …
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Investigating the larval/juvenile notothenioid fish species assemblage in Mcmurdo Sound, Antarctica using phylogenetic reconstruction
… and juvenile notothenioid fish assemblage of McMurdo Sound, Antarctica, and to compare this assemblage to the well-studied local adult community. Location: McMurdo Sound, Antarctica. Methods: We extracted genomic DNA from larval and juvenile notothenioid fishes collected from McMurdo Sound …
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Human impact on the McMurdo Dry Valley soils of Antarctica: Extending the limits of DNA detection
… out an evidence-based risk assessment of the McMurdo Dry Valley ecosystem (DryVER project), this research quantified human impact, in the form of DNA released from humans and human-associated microbiota, across spatial and temporal scales. This project was part of the MBIE grant entitled …
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Resolving functional resilience of microbial communities to climate-induced change in the McMurdo Dry Valleys of Antarctica
The McMurdo Dry Valleys of Antarctica are an abiotically driven ecosystem characterized by having a very simple trophic structure dominated by microbial communities, whose diversity is shaped by extreme abiotic gradients, particularly extreme aridity and oligotrophy. Regional isolation and …
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In situ temperature monitoring of the McMurdo Ice Shelf and ice shelf cavity by fiber-optic distributed temperature sensing
Ice shelf basal melt rates represent an important yet challenging to measure process. Basal melt rate measurements can assist to further understand ice-ocean interactions. In November 2011, two mooring containing fiber-optic cables for distributed temperature sensing (DTS) were installed at …
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Multi-scale Studies of Microbial Mats and Biocrusts: Integrating Remote Sensing with Field Investigations in Antarctica's McMurdo Dry Valleys
… cohesion and stability to soil surfaces. In the McMurdo Dry Valleys of Antarctica, microbial mats are the main source of fixed carbon in lentic and lotic environments, but their contribution to soil carbon and nitrogen cycling has not been systematically examined. In my dissertation, I …
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Influence of landscape-variation in geochemistry on taxonomic and functional composition of microbial mat communities in the McMurdo Dry Valleys, Antarctica
… mat and underlying soil communities in the McMurdo Dry Valleys of Antarctica across a gradient of phosphorus availability on glacial tills of distinct age and mineral composition in Taylor Valley, Antarctica. Microbial mat and soil DNA were extracted and sequenced on an Illumina NextSeq500 …
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Freezing avoidance and the presence of ice in shallow water Antarctic fishes
Fishes inhabiting ice-laden waters of McMurdo Sound, Antarctica, have ice present on all external tissues. This includes the integument, gills, and intestinal tract. With one exception, all internal tissues and fluids including the heart, liver, red muscle, white muscle, blood, bile, urine and …
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Influences on the oceanic biogeochemical cycling of the hybrid-type metals : cobalt, iron, and manganese
… within cold-core eddies (Hawaii), ice melt (McMurdo Sound, Antarctica), riverine input (Arctic Ocean), and winter mixing (McMurdo Sound). The biological influence on surface ocean distributions of cobalt was apparent by the observation of linear relationships between cobalt and phosphate in …
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Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese
… within cold-core eddies (Hawaii), ice melt (McMurdo Sound, Antarctica), riverine input (Arctic Ocean), and winter mixing (McMurdo Sound). The biological influence on surface ocean distributions of cobalt was apparent by the observation of linear relationships between cobalt and phosphate in …
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The effect of freeze /thaw temperature fluctuations on microbial metabolism of petroleum hydrocarbon contaminated Antarctic soil
<p>Petroleum contaminated soil exists at McMurdo Station in Antarctica. These soils were contaminated with historic releases of JP-8 jet fuel. Over time, there does not appear to have been significant reduction in the petroleum concentrations in these soils. This lack of reduction has been …
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Isolation of psychrophilic halophiles from the Antarctic polar desert
Saline soils in the Dry Valley region of McMurdo Sound, Antarctica, contained bacteria showing salt tolerance or requirement. Soils were plated by the spread plate method on soil extract-peptone-yeast extract media to which sodium chloride had been added in concentrations from 0 to15 per cent …
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Antarctic glacial chronology : new constraints from surface exposure dating
… the Koettlitz Glacier which flows into southern McMurdo Sound. In addition, a new 3He production rate calibration, and determination of initial 3He/4He in Ferrar Dolerite and Beacon Sandstone, substantially reduce uncertainties in Antarctic exposure ages. 3He production rates of 129 ± 4 …
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Screening for novel cold-adapted nitrile hydratases in Antarctic metagenornic libraries
… libraries constructed from soil taken from the McMurdo Dry Valleys in Antarctica were used for both functional and sequence based screens of NHases. Functional screens that were trialled were based on pH change and oligotrophic selective growth.
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Children and computers: collected works (1995–2014)
This commentary focuses on my photographic and film work that takes the relationship between children and computers as its theme. The text opens with a description of my earliest digital research project In a Shaded Place (1995), which explored the introduction of computers into early learning. I …
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