title: Nitrogen-15 isotope enrichment in benthic boundary layer gases of a stratified eutrophic iron and manganese rich lake

authors: Pearson, Lisa Kyle

subjects: nitrogen isotope

abstract: The applicability of the natural abundance of nitrogen gas isotope ratios was used to indicate the spatial distribution of nitrogen transformations in the water column and sediment pore waters of Lake Ngapouri, a small (area 0.19 km²), monomictic, eutrophic lake in the Taupo Volcanic Zone, North Island, New Zealand. Samples were collected from the epilimnion, hypolimnion, benthic boundary layer and at 5-cm intervals from the sediment pore waters at monthly intervals for 1 year. Values of δ¹⁵N [N2] ranged from -1 to 0.28%₀in the epilimnion, -1.5 to 1.25%₀ in the hypolimnion, -1.8 to 12.2%₀ in the benthic boundary layer and -0.7 to 3.5% in sediment pore waters. Values of δ¹⁵ [N₂] showed a strong seasonal pattern that was related to the loss of dissolved oxygen in the hypolimnion during seasonal stratification. Increases in 15N-enriched dinitrogen take place in the benthic boundary layer during the periods of anoxia (taken to be dissolved oxygen concentrations <6.3 µM) and may be related to abundant ammonium substrate (up to 275 µM) to support denitrification. Nitrate concentrations increased up to 36 µM with increasing duration of anoxia. We hypothesise that an alternative electron acceptor besides oxygen is required to support the nitrification needed for the production of nitrate. Iron and manganese hydroxides and oxides from material sedimenting out of the water column may have induced chemo-nitrification sufficient to oxidise ammonium in the anoxic benthic boundary layer. The nitrate formed would mostly be rapidly denitrified so that the δ¹⁵N[N₂] would continue to become enriched during the presence of anoxia, as observed in hypolimnion and benthic boundary layer of Lake Ngapouri. The changes in δ¹⁵N [N₂] values indicate the potential use of isotope ratios to identify and quantify potential chemonitrification/denitrification in the water column and sediment pore waters of lakes.

text: Nitrogen-15 isotope enrichment in benthic boundary layer gases of a stratified eutrophic iron and manganese rich lake The applicability of the natural abundance of nitrogen gas isotope ratios was used to indicate the spatial distribution of nitrogen transformations in the water column and sediment pore waters of Lake Ngapouri, a small (area 0.19 km²), monomictic, eutrophic lake in the Taupo Volcanic Zone, North Island, New Zealand. Samples were collected from the epilimnion, hypolimnion, benthic boundary layer and at 5-cm intervals from the sediment pore waters at monthly intervals for 1 year. Values of δ¹⁵N [N2] ranged from -1 to 0.28%₀in the epilimnion, -1.5 to 1.25%₀ in the hypolimnion, -1.8 to 12.2%₀ in the benthic boundary layer and -0.7 to 3.5% in sediment pore waters. Values of δ¹⁵ [N₂] showed a strong seasonal pattern that was related to the loss of dissolved oxygen in the hypolimnion during seasonal stratification. Increases in 15N-enriched dinitrogen take place in the benthic boundary layer during the periods of anoxia (taken to be dissolved oxygen concentrations <6.3 µM) and may be related to abundant ammonium substrate (up to 275 µM) to support denitrification. Nitrate concentrations increased up to 36 µM with increasing duration of anoxia. We hypothesise that an alternative electron acceptor besides oxygen is required to support the nitrification needed for the production of nitrate. Iron and manganese hydroxides and oxides from material sedimenting out of the water column may have induced chemo-nitrification sufficient to oxidise ammonium in the anoxic benthic boundary layer. The nitrate formed would mostly be rapidly denitrified so that the δ¹⁵N[N₂] would continue to become enriched during the presence of anoxia, as observed in hypolimnion and benthic boundary layer of Lake Ngapouri. The changes in δ¹⁵N [N₂] values indicate the potential use of isotope ratios to identify and quantify potential chemonitrification/denitrification in the water column and sediment pore waters of lakes.

year: 2012

title: Introduction

authors: Houlahan, Mark

abstract: When Dr Johnson, the 18• century critic, was asked to describe the quality of the poets from Pembroke College, Oxford (where the great doctor was briefly an undergraduate); he proudly said: "Sir, we are a nest of singing birds." In this collection we make the same claim about Waikato poets, accomplished and at ease in writing poetry and, by turns, confident, assertive, lyrical and sceptical in the ways they address the wide terrain of the Waikato. Readers north of the Mangatawhiri stream or south below Lake Taupo might be surprised by the poetic claims this anthology makes. We hope they will be also delighted and enthralled.

text: Introduction When Dr Johnson, the 18• century critic, was asked to describe the quality of the poets from Pembroke College, Oxford (where the great doctor was briefly an undergraduate); he proudly said: "Sir, we are a nest of singing birds." In this collection we make the same claim about Waikato poets, accomplished and at ease in writing poetry and, by turns, confident, assertive, lyrical and sceptical in the ways they address the wide terrain of the Waikato. Readers north of the Mangatawhiri stream or south below Lake Taupo might be surprised by the poetic claims this anthology makes. We hope they will be also delighted and enthralled.

year: 2019

title: Indigenising the screen: Screenplay and critical analysis for The Prophet

authors: Bristowe, Joseph Curtis

subjects: indiginization

abstract: This thesis tests the hypothesis that it is possible to both decolonise and indigenise the New Zealand cinema screen. Secondary research reveals how those discourses that promoted roles and expectations for Māori within the New Zealand film industry were based principally upon historical colonial ideologies imposed by various means upon the native populous, and subsequently reproduced. These discourses of race, gender and religion perpetuate negative belief systems about Māori and contribute to the reproduction of stereotypical images of Māori, such as the irrational, naive, simpleminded and warlike Māori man, or the domesticated, lustful and sexually available Māori woman. 

Research by creative practice advances the project of decolonising the New Zealand screen through the writing of a feature length screenplay based on careful research and intimate cultural knowledge, and by working according to an appropriate kaupapa Māori framework. The resulting screenplay, The Prophet, brings to life the multitude of forces that coalesced to shape the life of 19th century Māori warrior and prophet, Te Kooti Arikirangi Te Tūruki. In his death, as in his life, he remains an enigmatic figure. In written accounts and in Pākehā memories he appears as a violent rebel, mass murderer and religious fanatic. This epic re-telling focuses on the character of Te Kooti, showing him to be a man who accomplished great feats in the face of injustice, adversity and hardship. 
A critical analysis of the screenplay reveals how I adopted a unique cross cultural writing approach drawing upon both the 'classic' western narrative structure as well as kaupapa Māori pūrākau oral tradition. I argue that this approach combines effectively to materialise strong anti-colonial perspectives aimed specifically at subverting long-held and dominant colonial discourses. Such an approach to scriptwriting rejects the tradition of being defined, constructed and represented through discourses that serve to promote the interests of the Pākehā majority and, in doing so, urges the utilisation of Māori philosophies, concepts and practices in the scriptwriting/film production process.

text: Indigenising the screen: Screenplay and critical analysis for The Prophet This thesis tests the hypothesis that it is possible to both decolonise and indigenise the New Zealand cinema screen. Secondary research reveals how those discourses that promoted roles and expectations for Māori within the New Zealand film industry were based principally upon historical colonial ideologies imposed by various means upon the native populous, and subsequently reproduced. These discourses of race, gender and religion perpetuate negative belief systems about Māori and contribute to the reproduction of stereotypical images of Māori, such as the irrational, naive, simpleminded and warlike Māori man, or the domesticated, lustful and sexually available Māori woman. 

Research by creative practice advances the project of decolonising the New Zealand screen through the writing of a feature length screenplay based on careful research and intimate cultural knowledge, and by working according to an appropriate kaupapa Māori framework. The resulting screenplay, The Prophet, brings to life the multitude of forces that coalesced to shape the life of 19th century Māori warrior and prophet, Te Kooti Arikirangi Te Tūruki. In his death, as in his life, he remains an enigmatic figure. In written accounts and in Pākehā memories he appears as a violent rebel, mass murderer and religious fanatic. This epic re-telling focuses on the character of Te Kooti, showing him to be a man who accomplished great feats in the face of injustice, adversity and hardship. 
A critical analysis of the screenplay reveals how I adopted a unique cross cultural writing approach drawing upon both the 'classic' western narrative structure as well as kaupapa Māori pūrākau oral tradition. I argue that this approach combines effectively to materialise strong anti-colonial perspectives aimed specifically at subverting long-held and dominant colonial discourses. Such an approach to scriptwriting rejects the tradition of being defined, constructed and represented through discourses that serve to promote the interests of the Pākehā majority and, in doing so, urges the utilisation of Māori philosophies, concepts and practices in the scriptwriting/film production process.

year: 2009