Browsing by Supervisor "Hamilton, David P."
Now showing items 1-20 of 34
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A validation study of phycocyanin sensors for monitoring cyanobacteria in cultures and field samples
(University of Waikato, 2016)Cyanobacteria are photosynthetic prokaryotes present in almost all terrestrial and aquatic environments. Under favourable conditions of high nutrient inputs, high water temperature and adequate light, they can rapidly ... -
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, ... -
Bloom formation, species succession, toxin variability and benthic recruitment of cyanobacteria in Lake Rotorua, Kaikoura
(University of Waikato, 2016)Cyanobacteria are an ancient group of photosynthetic prokaryotes that are found in a wide range of habitats including freshwater lakes and rivers. In aquatic ecosystems, under favourable environmental conditions, cyanobacteria ... -
Capabilities and considerations for the implementation of a phycocyanin sensor to enhance cyanobacteria monitoring in lakes
(University of Waikato, 2017)Bloom-forming cyanobacteria are problematic in recreational waters as humans may be exposed to their toxins via primary contact or ingestion. Cyanobacteria can be monitored using microscopy but this is time consuming, ... -
Carbon dioxide and methane emissions from the Te Arawa lakes of Rotorua, New Zealand
(University of Waikato, 2016)One of the biggest issues confronting humankind today is global warming due to the rapidly increasing greenhouse gas (GHG) emissions, namely CO₂, CH₄ and N₂O. The Intergovernmental Panel for Climate Change (IPCC) has ... -
Charophyte Response to Herbicide and Mycoherbicide Applications
(University of Waikato, 2011)This thesis describes an investigation into the impacts on charophytes of four selected aquatic herbicide and a mycoherbicide products currently used or under development in New Zealand for alien invasive aquatic plant ... -
Dynamics of internal nutrient loading in a eutrophic, polymictic lake (Lake Rotorua, New Zealand)
(The University of Waikato, 2006)Lake Rotorua is a large (80 krn2), polymictic, eutrophic, shalJow (mean depth 10.8 m) lake in central North Island, New Zealand. Blooms of cyanobacteria and occasional anoxia of bottom waters are characteristic of the ... -
The ecological role of the suspension feeding bivalve, Austrovenus stutchburyi, in estuarine ecosystems
(University of Waikato, 2011)Suspension feeding bivalves are described as key species in many aquatic ecosystems, where they can influence primary productivity and nutrient dynamics, are food for higher trophic levels, and may be harvested in commercial ... -
Economic resilience and environmental performance of dairy farms in the upper Waikato region
(University of Waikato, 2014)Dairy farming has impacts on receiving water bodies that have increased in New Zealand during the past two decades due to the intensification and expansion of the industry. As a result the industry has implemented a number ... -
Food webs in the lower Waikato River and the role of hydrogeomorphic complexity
(University of Waikato, 2014)Large rivers are fundamental to human societies and consequently their ecosystems have come under increasing pressure from a range of developments and uses. Despite this, there is still a major knowledge gap understanding ... -
High Frequency Monitoring and Three-Dimensional Modelling of Temporal Variations in Water Quality of Lake Rotorua, New Zealand
(The University of Waikato, 2010)Over the last few decades, anthropogenic eutrophication has become a significant problem in New Zealand and other parts of the world. Lake Rotorua is located in the central North Island, New Zealand. It is a lake with ... -
The influence of connectivity on the functional role of a natural and re-constructed side-arm in the lower Waikato River
(University of Waikato, 2011)This thesis was a comparative study of a natural and a recently re-constructed (artificial) side-arm in the lower Waikato River. A twelve monthly temporal investigation into (i) the physico-chemical variables, nutrient and ... -
Investigation of Microcystin Processing, Production and Export by Microcystis sp.
(University of Waikato, 2014)During this study, the effect of different processing methods on the microcystin quota (microcystins per cell) was investigated. Microcystins from two Microcystis strains and one Planktothrix strain were quantified using ... -
Kōura (Paranephrops planifrons) populations in the Te Arawa lakes: An ecological assessment using the traditional Māori tau kōura harvesting method and recommendations for sustainable management
(University of Waikato, 2015)Freshwater crayfish are amongst the most influential of biota in many aquatic systems. They have various ecological functions, acting as shredders, detritivores and predators which in turn influence other macroinvertebrate ... -
Measurements and modelling of eutrophication processes in Lake Rotoiti, New Zealand
(University of Waikato, 2010)Deterioration of water quality is a common problem for aquatic systems globally, which is accelerated by factors such as urban settlement, farming, forestry and recreation. Spatial variability of water quality in these ... -
Measuring and modelling estuarine macroalgae blooms and water column nutrients
(University of Waikato, 2016)This thesis examines the dynamics of estuarine macroalgae blooms of the genus Ulva and the environmental factors controlling them, using process-based mathematical models as well as observation data from Tauranga Harbour ... -
A modelling approach to assist with managing water quality in a catchment subject to rapid urbanisation: Lake Rotokauri, Hamilton, New Zealand
(University of Waikato, 2011)The objective of this study was to apply a coupled hydrodynamic-ecological model to a peat-stained and shallow (~4 m maximum depth) eutrophic lake whose catchment is likely to be subject to urban expansion associated with ... -
Modelling temporal dynamics of discharge and nutrient loading from a mixed land use catchment, and interactions with a eutrophic, temperate lake under climate change
(The University of Waikato, 2017)Understanding anthropogenic–induced changes in catchment water discharge and nutrient loads is critical for eutrophication assessment and sustainable management of receiving environments. Anthropogenic activities have ... -
Modelling the efficacy of in-lake and catchment remediation actions for restoration of a small, eutrophic lake
(University of Waikato, 2015)Land conversion from native vegetation to agriculture has been widespread in New Zealand over the past century. The resulting increases in nutrient runoff have led to eutrophication of many lakes and have resulted in harmful ... -
Monitoring and hydrodynamic modelling of groundwater inflows into Lake Rotokakahi, New Zealand
(University of Waikato, 2016)Lake Rotokakahi is located 10 km south of Rotorua and is of immense cultural importance to the local iwi. The lake also has significant historical and recreational values, which prompted iwi to make the lake private in ...
