Browsing by Supervisor "Hartland, Adam"
Now showing items 1-18 of 18
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Identifying control points of excessive nitrate load in a pastoral catchment to support lake management
(The University of Waikato, 2023)Excessive leaching of nitrogen (N) from pasture grazing catchments continues to challenge sustainable freshwater and lake management. However, managing contaminant export from diffuse agricultural sources is difficult due ... -
From soil to groundwater: Assessing the leaching potential of cadmium across gradients of soil types and land-uses
(The University of Waikato, 2022)The problem: The productivity of agriculture, the mainstay of New Zealand’ economy, relies on millions tons of fertiliser to maintain soil fertility. These fertilisers contain contaminants, including cadmium (Cd) which ... -
Redox cycling of colloidal macro- and micro-nutrients in a monomictic lake
(The University of Waikato, 2022)Lakes are more than just water bodies as they play an essential role in the cycling of nutrients and carbon, with impacts at the local and global scale. This study selected Lake Ngapouri, a small monomictic lake in the ... -
The effects of ocean acidification on microbial nutrient cycling and productivity in coastal marine sediments
(The University of Waikato, 2022)Ocean Acidification (OA), commonly referred to as the “other CO₂ problem,” illustrates the current rise in atmospheric carbon dioxide (CO₂) levels, precipitated in large by human-related activity (e.g., fossil fuel combustion ... -
Improved determination of nitrate concentrations and flow rates in freshwater using ‘Diffusive Gradients in Thin-films’
(The University of Waikato, 2021)Nutrient pollution, particularly by nitrate, is a persistent issue in waterways. Numerous mitigation strategies have been developed to address this pollution, such as denitrifying bioreactors. The monitoring, however, of ... -
Effects of organic matter complexation on partitioning of first-row transition metals into calcite: cave-analogue crystal growth studies
(The University of Waikato, 2020)Speleothems are important archives of terrestrial paleoclimate due to their wide geographical coverage and the ability to date their growth layers using U-Th and U-Pb radiometric dating. Extensive research into various ... -
The terrestrial carbon cycle in transition: tracking changes using novel tracers on multiple timescales
(The University of Waikato, 2020)Soils store more carbon than the atmosphere and terrestrial vegetation combined, therefore, changes in soil carbon storage can affect the global carbon budget. One of the forms in which carbon is exported from soil is as ... -
Response and resilience of estuarine benthic ecosystems to anthropogenic pressures
(The University of Waikato, 2020)Human activities are altering coastal environments at local and global scales with largely unknown consequences. Catchment land-use changes increase the rates of delivery of fine sediments and nutrients to estuaries, ... -
Novel approaches for modelling changes in phytoplankton diversity and lake ecosystem function
(The University of Waikato, 2019)Ecosystem function represents the collective outcome of many different processes. Function may be interrupted by events that originate from outside a system, influencing biological diversity dynamics. Difficulties in ... -
Passive in-situ estrogenic potency sampling with DGT-YES
(The University of Waikato, 2019)The purpose of this research was to investigate the presence of bisphenolic plastics and synthetic estrogens in municipal water systems, as well as along the Waikato River. The concentration of these compounds was assessed ... -
In situ measurement of metal-ligand complex dissociation rates in cave dripwaters
(The University of Waikato, 2019)The purpose of this study was to develop a new method for determining the trace metal binding properties of natural organic matter (NOM) in cave dripwaters. The methodology is based on the diffusive gradients in the ... -
Biogeochemical Characterisation of an Alum Dosed Stream: Implications for Phosphate Cycling in Lake Rotoehu
(The University of Waikato, 2017)Lakes are highly valued freshwater ecosystems which provide many goods and services upon which humans are reliant. Eutrophication of waterways, driven by the over-enrichment of nutrients such as phosphorus and nitrogen, ... -
Cadmium accumulation in agricultural soils
(The University of Waikato, 2017)Cadmium (Cd) has accumulated in New Zealand (NZ) soils as a result of phosphate fertiliser application. Cadmium is a biotoxic heavy metal and can be adsorbed by soil and enter the human food chain. Three objectives were ... -
The Fate and Effects of Contaminants in Estuarine Environments
(University of Waikato, 2017)Estuaries are sensitive environments regarding their response to anthropogenic events. The accumulation of toxic trace elements, such as Cd and Pb, has detrimental consequences on benthic community composition and function ... -
Temporal variability in the water quality of a deep temperate oligotrophic lake
(University of Waikato, 2016)Lakes change over time in response to climate and catchment disturbance, even in the absence of anthropogenic stressors. This temporal change may impact the setting of reference conditions for lakes. Many sources of ... -
The Effects of Contaminated Rena Sediments on Juvenile Paua (Haliotis iris)
(University of Waikato, 2015)The grounding of the MV Rena on Otaiti resulted in the release of heavy fuel oil and container debris contaminants into the surrounding environments including the rocky shores of the adjacent Mōtītī Island. This is the ... -
Toitu Te Moananui a Toi – The Effects of the MV Rena on the Water Quality, Chemistry and Zooplankton of Otaiti (Astrolabe Reef)
(University of Waikato, 2015)Humans have had a profound effect on the world’s oceans, particularly through pollution. Marine pollution incidents are particularly important and increasingly involve both petrochemical and metal contamination. The effects ... -
Evaluating the potential of historic sheep dips as point sources of trace element and organochlorine pollutants
(University of Waikato, 2015)Sheep dipping was a historic agricultural practice where sheep were immersed into insecticides to eradicate external parasites. Historical use of pesticides has caused localised soil contamination at former sheep dipping ...
