title: Predicting the effects of climate change on trophic status of three morphologically varying lakes: Implications for lake restoration and management

authors: Trolle, Dennis

subjects: DYRESM-CAEDYM

abstract: To quantify the effects of a future climate on three morphologically different lakes that varied in trophic status from oligo-mesotrophic to highly eutrophic, we applied the one-dimensional lake ecosystem model DYRESM-CAEDYM to oligo-mesotrophic Lake Okareka, eutrophic Lake Rotoehu, both in the temperate Bay of Plenty region, and highly eutrophic Lake Ellesmere, in the temperate Canterbury region, New Zealand. All three models were calibrated for a three-year period and validated for a separate two-year period. The model simulations generally showed good agreement with observed data for water column temperature, dissolved oxygen (DO), total phosphorus (TP), total nitrogen (TN) and chlorophyll a (Chl a) concentrations. To represent a possible future climate at the end of this century, mean annual changes in air temperature by 2100, derived from the IPCC A2 scenario downscaled for these lake regions, were added to the daily baseline temperatures for years 2002–2007. Lake model simulations using this future climate scenario indicate differential increases in eutrophication in all three lakes, especially during summer months. The predicted effects on annual mean surface water concentrations of TP, TN and Chl a will be equivalent to the effects of increasing external TN and TP loading by 25–50%. Simulations for the polymictic, eutrophic Lake Rotoehu further indicate that cyanophytes will be more abundant in the future climate, increasing by >15% in their contribution to annual mean Chl a. Therefore, future climate effects should be taken into account in the long-term planning and implementation of lake management as strategies may need to be refined and adapted to preserve or improve the present-day lake water quality.

text: Predicting the effects of climate change on trophic status of three morphologically varying lakes: Implications for lake restoration and management To quantify the effects of a future climate on three morphologically different lakes that varied in trophic status from oligo-mesotrophic to highly eutrophic, we applied the one-dimensional lake ecosystem model DYRESM-CAEDYM to oligo-mesotrophic Lake Okareka, eutrophic Lake Rotoehu, both in the temperate Bay of Plenty region, and highly eutrophic Lake Ellesmere, in the temperate Canterbury region, New Zealand. All three models were calibrated for a three-year period and validated for a separate two-year period. The model simulations generally showed good agreement with observed data for water column temperature, dissolved oxygen (DO), total phosphorus (TP), total nitrogen (TN) and chlorophyll a (Chl a) concentrations. To represent a possible future climate at the end of this century, mean annual changes in air temperature by 2100, derived from the IPCC A2 scenario downscaled for these lake regions, were added to the daily baseline temperatures for years 2002–2007. Lake model simulations using this future climate scenario indicate differential increases in eutrophication in all three lakes, especially during summer months. The predicted effects on annual mean surface water concentrations of TP, TN and Chl a will be equivalent to the effects of increasing external TN and TP loading by 25–50%. Simulations for the polymictic, eutrophic Lake Rotoehu further indicate that cyanophytes will be more abundant in the future climate, increasing by >15% in their contribution to annual mean Chl a. Therefore, future climate effects should be taken into account in the long-term planning and implementation of lake management as strategies may need to be refined and adapted to preserve or improve the present-day lake water quality.

year: 2010

title: The Relation Between Preference and Demand in the Domestic Hen: Does Preference Vary With Price?

authors: Bruce, Julie-Anne Marie

subjects: Preference

abstract: ABSTRACT

Six hens responded under an increasing Fixed Ratio schedule of reinforcement to assess demand separately for two different food types: wheat and puffed wheat.  Demand curves generated showed the least preferred food, puffed wheat, yielded a higher initial (ln L) demand than the more preferred food, wheat.  While responding for the more preferred food, wheat, produced lower initial (ln L) demand functions, responding for wheat was maintained to higher increasing FR schedules of reinforcement than was that for puffed wheat.  This phenomenon occurred across all six hens.  To assess preference between the two food types the hens responded under a two-link concurrent-chain schedule of reinforcement.  Under the concurrent-chain schedule of reinforcement there were three conditions, each consisted of a initial link with VI 90-s VI 90-s in effect, and terminal links of FR1, FR8 and FR32.  The concurrent-chain schedule was used to examine if or how preference may relate to demand.  Preference measures obtained showed wheat was generally preferred to puffed wheat across all prices throughout the preference assessment.  As price increased in the terminal link during the preference assessment, preference for wheat became more extreme as did the hens responding.  The results suggest that while there is a systematic relation between preference and demand, in that at higher FR values food with higher demand levels is preferred.  This does not seem to hold, however, at FR1

text: The Relation Between Preference and Demand in the Domestic Hen: Does Preference Vary With Price? ABSTRACT

Six hens responded under an increasing Fixed Ratio schedule of reinforcement to assess demand separately for two different food types: wheat and puffed wheat.  Demand curves generated showed the least preferred food, puffed wheat, yielded a higher initial (ln L) demand than the more preferred food, wheat.  While responding for the more preferred food, wheat, produced lower initial (ln L) demand functions, responding for wheat was maintained to higher increasing FR schedules of reinforcement than was that for puffed wheat.  This phenomenon occurred across all six hens.  To assess preference between the two food types the hens responded under a two-link concurrent-chain schedule of reinforcement.  Under the concurrent-chain schedule of reinforcement there were three conditions, each consisted of a initial link with VI 90-s VI 90-s in effect, and terminal links of FR1, FR8 and FR32.  The concurrent-chain schedule was used to examine if or how preference may relate to demand.  Preference measures obtained showed wheat was generally preferred to puffed wheat across all prices throughout the preference assessment.  As price increased in the terminal link during the preference assessment, preference for wheat became more extreme as did the hens responding.  The results suggest that while there is a systematic relation between preference and demand, in that at higher FR values food with higher demand levels is preferred.  This does not seem to hold, however, at FR1

year: 2007

title: How Pākehā in not-for-profit organisations implement Te Tiriti o Waitangi

authors: Newcombe, Nicolina Isabel

subjects: Decolonisation

abstract: The aims of this research are to understand what is happening in not-for-profit organisations in relation to our obligation to honour Te Tiriti o Waitangi, and to describe some strategies Pākehā can use to implement Te Tiriti o Waitangi in our work in the not-for-profit sector.  

The history of, and current circumstances affecting, the not-for-profit sector have formed a disabling context, diverting energy away from deepening relationships with local hapū (subtribe). Compounding this situation, the core texts about Te Tiriti and not-for-profit organisations are inconsistent and mainly focus on the first steps of the journey: Treaty education and self assessment.  

After writing about my own experiences with Te Tiriti and working in the not-for-profit sector and comparing my stories with the stories of other Pākehā, I recorded and transcribed conversations with six anonymous Pākehā not-for-profit workers and analysed our commonalities. All participants and their organisations wanted to enact best practice, although 
this aspiration was challenged by many factors, including: a spectrum of understandings about Te Tiriti which often led to piecemeal attempts at power sharing; concerns about the effectiveness of self-assessment by Pākehā about our own Treaty work because of inevitable and inbuilt biases; experience of minimisation or exclusion for speaking up about Te Tiriti at work; box ticking Treaty policies; Māori employees being treated differently to other staff; and confusion between cultural expression and genuine power sharing.  

Protective factors that came through in interviews included: cultural practices that were woven through organisations in a way that was beneficial and welcoming to Māori; relationships with kaumātua (elders); appropriate and emotionally engaging Treaty education; Māori governance members, Māori led research in the community, and Māori involvement in all projects; te reo (Māori language) being a commonly used language in the work place; acknowledgment of our own privilege as Pākehā; and engagement in continuous dialogue about racism. 

Reflections on these issues led to recommendations for how to move forward with implementing Te Tiriti in not-for-profit organisations. These recommendations hinge on a set of actions underpinned by a set of values. Three change management strategies are also described to assist organisations with this transformation. 

This research is intended to be a building block towards empowering Pākehā allies to identify practices, policies, and power structures that could be developed to transform our organisations, and embody our obligations to Te Tiriti, leading to more effective outcomes for all New Zealanders.

text: How Pākehā in not-for-profit organisations implement Te Tiriti o Waitangi The aims of this research are to understand what is happening in not-for-profit organisations in relation to our obligation to honour Te Tiriti o Waitangi, and to describe some strategies Pākehā can use to implement Te Tiriti o Waitangi in our work in the not-for-profit sector.  

The history of, and current circumstances affecting, the not-for-profit sector have formed a disabling context, diverting energy away from deepening relationships with local hapū (subtribe). Compounding this situation, the core texts about Te Tiriti and not-for-profit organisations are inconsistent and mainly focus on the first steps of the journey: Treaty education and self assessment.  

After writing about my own experiences with Te Tiriti and working in the not-for-profit sector and comparing my stories with the stories of other Pākehā, I recorded and transcribed conversations with six anonymous Pākehā not-for-profit workers and analysed our commonalities. All participants and their organisations wanted to enact best practice, although 
this aspiration was challenged by many factors, including: a spectrum of understandings about Te Tiriti which often led to piecemeal attempts at power sharing; concerns about the effectiveness of self-assessment by Pākehā about our own Treaty work because of inevitable and inbuilt biases; experience of minimisation or exclusion for speaking up about Te Tiriti at work; box ticking Treaty policies; Māori employees being treated differently to other staff; and confusion between cultural expression and genuine power sharing.  

Protective factors that came through in interviews included: cultural practices that were woven through organisations in a way that was beneficial and welcoming to Māori; relationships with kaumātua (elders); appropriate and emotionally engaging Treaty education; Māori governance members, Māori led research in the community, and Māori involvement in all projects; te reo (Māori language) being a commonly used language in the work place; acknowledgment of our own privilege as Pākehā; and engagement in continuous dialogue about racism. 

Reflections on these issues led to recommendations for how to move forward with implementing Te Tiriti in not-for-profit organisations. These recommendations hinge on a set of actions underpinned by a set of values. Three change management strategies are also described to assist organisations with this transformation. 

This research is intended to be a building block towards empowering Pākehā allies to identify practices, policies, and power structures that could be developed to transform our organisations, and embody our obligations to Te Tiriti, leading to more effective outcomes for all New Zealanders.

year: 2019