27 results for Unclassified, ResearchCommons@Waikato

  • Review: The Intricate Art of Actually Caring

    Houlahan, Mark (2010)

    Unclassified
    University of Waikato

    It was a cold and rainy week. Two boys from Wellington bought their stylish road play to Hamilton. Meanwhile, back in Wellington, Ian McKellen bought his own fame back to Wellywood to stage Waiting for Godot, the biggest road play of them all.

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  • Review: Salon

    Houlahan, Mark (2010)

    Unclassified
    University of Waikato

    Salon was a welcome local attempt at exploiting the theatre potential of non-traditional theatre spaces. A salon is a great choice: so much potential for narcissism and display. The hot lights, the big mirrors. Everything is on display.

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  • Dataset for: Southern Hemisphere bog persists as a strong carbon sink during droughts

    Goodrich, Jordan Paul; Campbell, David I.; Schipper, Louis A. (2017)

    Unclassified
    University of Waikato

    Main article is available online at http://hdl.handle.net/10289/11373

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  • LERNZ: Lake Ecosystem Restoration New Zealand – Fact Sheet

    Tempero, Grant Wayne; Hamilton, David P. (2015)

    Unclassified
    University of Waikato

    Based at the University of Waikato (Figure 1), the aim of the LERNZ research programme is to provide end-users such as community groups, regional councils and governmental agencies with practical tools and expertise for restoring indigenous biodiversity and water quality in lakes. The research programme is centred around two main themes: • New models and technologies to effectively manage harmful algal blooms • New pest fish management and control technologies LERNZ is based at the University of Waikato, Hamilton New Zealand, and has established a number of collaborations with domestic and international research organisations since its inception in 2005.

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  • Nutrient and sediment loads from farm drains – fact sheet

    Tempero, Grant Wayne; Hamilton, David P. (2015)

    Unclassified
    University of Waikato

    Runoff from intensive agriculture has been identified as a major contributor to the decline of New Zealand's freshwater ecosystems. Excessive nutrient and sediment losses to lakes and rivers lead to reduced water clarity and quality, which in turn leads to reductions in biodiversity and amenity and aesthetic values.

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  • Applying citizen science to freshwater ecosystem restoration – fact sheet

    Peters, Michael A.; Hamilton, David P. (2015)

    Unclassified
    University of Waikato

    Citizen science describes the diverse ways in which the public participates in scientific investigations. Participation covers a spectrum from sending observations to a project coordinator to designing, implementing protocols, analysing and sharing findings. The popularity of citizen science both for educational and scientific purposes has grown in recent decades. Community volunteers now participate in diverse programmes that investigate the effects of climate change on biota, evolutionary processes, invasive species ecology, and changes in water and air quality (Figure 1).

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  • The contribution of lakes to greenhouse gas emissions – fact sheet

    Santoso, A; Hamilton, David P. (2015)

    Unclassified
    University of Waikato

    Greenhouse gases such as carbon dioxide (C0₂) , methane (CH₄) and nitrous oxide (N₂0) trap heat in the atmosphere. Lakes can play an important role in regulating these gases at global scales. Total carbon uptake by lakes is of the same magnitude as that of oceans or forests, despite lakes occupying s area. In lakes, GHGs are mostly produced in the bottom sediment as products of organic matter decomposition. Geothermal activities - of importance to some Rotorua lakes - may also contribute substantial amounts of C0₂ and CH₄.

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  • Lake models – fact sheet

    Hamilton, David P. (2015)

    Unclassified
    University of Waikato

    Models of lakes are used to provide insights into water quality at some future point in time, so that management actions may be targeted and cost-effective. In the past, small-scale physical models were used to simulate lake environments (Figure 1), but nowadays computer models are used to test potential management options. Computer models use a series of mathematical equations to describe the complex interactions amongst physical, chemical and biological processes that affect the water quality of a lake. The equations are stitched together consecutively in a computer program, allowing millions of calculations to take place in a single simulation.

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  • Lake restoration lags – fact sheet

    Mueller, H; Hamilton, David P. (2015)

    Unclassified
    University of Waikato

    Regulatory responses to declines in lake health have often been characterised by long lag times. Under these circumstances regulation has often failed to prevent declining lake health or to implement successful restoration programmes. For Lake Rotorua, response lags can be seen in the time passing between the recognition of water quality decline (e.g. weed problems and algal blooms), and the effect of regulatory actions to improve water quality (e.g. land use management changes). Research undertaken by Mueller et al. (2015) has shown that lag times of approximately 5 years may occur between significant environmental declines and regulatory responses.

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  • Paleolimnology to determine lake reference conditions – fact sheet

    Kpodonu, A; Hamilton, David P. (2015)

    Unclassified
    University of Waikato

    Paleolimnology is the study of the early history of lakes based on sediment composition. Lake sediments build up in undisturbed areas of lake bottoms (e.g. in deep central basins) over long periods of time. These sediments will reflect the prevailing conditions in the catchment, climate and in-lake processes at the time of deposition. Specific 'markers' can be used to determine when a particular layer of sediment was deposited. For example, in volcanic areas lakes sediments may contain volcanic ash layers from historical eruptions that can be used to date the sediment (Figure 1). Where it is possible to take long sediment cores in relatively undisturbed areas the historical record of the lake may stretch back far enough to give insights into historical climatic conditions and pre-human settlement state of the lake. This pre-human condition is sometimes referred to as a "reference state". Defining the reference state is important as it provides an indication of the extent to which the current state differs from it. This difference provides a useful reference point for setting targets to improve the state of a lake (e.g., as part of the limiting-setting process envisaged under the National Objectives Framework for Freshwater Management 2011).

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  • Catchment modelling with SWAT – fact sheet

    Me, W; Hamilton, David P. (2015)

    Unclassified
    University of Waikato

    Catchment models determine the source and extent of water quality problems in a catchment. Catchment models may be used to identify 'hotspots' in a region and once calibrated these models may be used to test various land management, land use, and climate-change scenarios. SWAT (Soil & Water assessment tool) is a relatively complex model. The development of SWAT is a continuation of USDA Agricultural Research Service (ARS) modelling experience spanning more than 30 years. SWAT has been used with some degree of success by the LERNZ group at The University of Waikato and it has been applied to several New Zealand catchments. The model is capable of producing daily discharge and nutrient and sediment loads to streams at a sub-catchment level. ArcSWAT is an ArcGIS-ArcView extension and graphical user input interface for SWAT.

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  • LakeAnalyzer: Lake internal dynamics analysis software – fact sheet

    Muraoka, Kohji; Hamilton, David P. (2015)

    Unclassified
    University of Waikato

    LakeAnalyzer is a computer program used to calculate indices of mixing and stratification, which are critical to understanding biogeochemical cycles of lakes and reservoirs. Lake physical stability indices, surface mixing depth and thermocline depth are calculated according to established literature definitions and returned to the user in a time-series format. LakeAnalyzer was developed to analyse high-frequency data collected from instrumented lake buoys (Figure 1). It provides a way to compare mixing and stratification indices in lakes across gradients of climate, hydrophysiography, and time, and provides a basis for understanding of the resulting biogeochemical transformations at different spatial and temporal scales.

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  • Remote sensing of water quality – fact sheet

    Hicks, Brendan J.; Allan, Mathew Grant (2015)

    Unclassified
    University of Waikato

    Evaluating water quality is a key tool in lake management. Typically water quality samples are restricted to a limited number of point samples collected in situ in the field, which can be time consuming and costly. Also, the few in situ points sampled fail to capture the spatial variability, e.g., for the large Lake Waikare (3,400 ha; Figure. 1).

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  • Pest Fish Control - Fact Sheet

    Tempero, Grant Wayne; Collier, Kevin J.; Hicks, Brendan J. (2015)

    Unclassified
    University of Waikato

    Due to their negative impacts on water quality and native biodiversity in New Zealand, regional councils have included a number of introduced freshwater fish species such as koi carp, rudd, brown bullhead catfish, goldfish, tench, gambusia (mosquitofish) and European perch (Figure 1) in their pest management plans. The Department of Conservation and regional councils undertake control and eradication programmes around New Zealand every year in order to contain their spread and reduce their impacts. Nearly all regions of mainland New Zealand have at least one of these species but they are most prevalent in the Auckland and Waikato regions. LERNZ has been researching the population ecology and capture methods of pest fish populations in order to develop efficient methods for their control.

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  • New Zealand pest fish species: Koi carp and Gambusia – fact sheet

    Tempero, Grant Wayne (2015)

    Unclassified
    University of Waikato

    New Zealand has a total of about 36 native freshwater fish species, and a further 22 (39% of all freshwater fish) have been introduced from overseas. Like all introduced species, they have some impact on New Zealand's native ecosystems, but some cause more problems than others.

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  • Flocculation and sediment capping – fact sheet

    Tempero, Grant Wayne; Paul, Wendy J. (2015)

    Unclassified
    University of Waikato

    Sediment capping and flocculation are in-lake techniques designed to reduce internal nutrient loads from the bottom sediments of lakes. These loads are roughly equivalent in magnitude to external loads. Case studies of the Rotorua lakes (Figure 1) show that with careful design and management, sediment capping and flocculation can reduce nutrient concentrations and the likelihood of algal blooms. Relevant actions can include: (i) reducing bioavailable phosphorus in stream inflows through continuous addition of the active material to the stream, (ii) removing bioavailable phosphorus, and flocculation and sedimentation of nutrients, and (iii) altering sediment composition so that nutrients are more efficiently retained within the bottom sediments

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  • Exclusion and removal of pest fish from Lake Ohinewai – fact sheet

    Tempero, Grant Wayne; Ling, Nicholas; Daniel, Adam Joshua (2015)

    Unclassified
    University of Waikato

    Many of the shallow lakes in the lower Waikato River floodplain have significantly degraded water quality as a result of nutrient and sediment enrichment from non-point sources. Pest fish species such as koi carp, goldfish, and catfish have exacerbated lake decline by resuspending lake sediments and uprooting submerged macrophytes. This this resulted in a collapse of submerged macrophytes and progression from clear-water oligotrophic state to a eutrophic (algal-dominated) state.

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  • Destratification – fact sheet

    Tempero, Grant Wayne; Paul, Wendy J. (2015)

    Unclassified
    University of Waikato

    During summer, the surface waters of lakes warm and become less dense than the colder bottom waters. This process is known as stratification and prevents surface and bottom water mixing. Stratification can occur intermittently in shallower lakes or for up to 9 months in deeper lakes (Figure 1). Under natural conditions stratification normally breaks down during the winter months when surface temperatures equilibrate with the bottom of the lake.

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  • Legal status of Rudd, Catfish, Goldfish – fact sheet

    Collier, Kevin J. (2015)

    Unclassified
    University of Waikato

    New Zealand has a total of about 36 native freshwater fish species, and a further 22 species (equivalent to 38% of all freshwater fish species) have been introduced from overseas. Like all introduced species, they have some impact on New Zealand's native ecosystems, but some cause more problems than others.

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  • LERNZdb Freshwater Database – fact sheet

    Parshotam, A. (2015)

    Unclassified
    University of Waikato

    The LERNZdb Freshwater Database is a repository for freshwater quality data and biodiversity measurement data for lakes, rivers and wetlands in New Zealand. It was developed as part of the Lake Ecosystem Restoration New Zealand (LERNZ: LERNZ.co.nz) programme in co-operation between the Information & Technology Services Division (ITS) and LERNZ researchers at the University of Waikato. LERNZdb has the ability to store a wide variety of freshwater data in a consistent format, it also scores the quality of the data based on the provided quality controlled information. This allows the user to filter data based on the standard of data collection and encourages the provision of high quality data for use in modelling applications.

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