title: An assessment of the benefits of cleaner streams: A New Zealand case study

authors: Marsh, Dan

subjects: non-market valuation

abstract: Water pollution is now considered to be one of the most important environmental issues facing New Zealand. Water quality in rivers, lakes and streams is generally falling alongside the increase in farming intensity, especially in dairying. Currently, technical and regulatory mechanisms to reduce non-point source pollution from agriculture are the focus of an intensive effort involving industry, researchers, regulators and other stakeholders.
The research described in this non-technical paper aims to complement existing knowledge by developing appropriate methodology for valuing water quality improvements in New Zealand. It is envisaged that this type of information will assist the policy process by allowing decision makers to consider both the costs and the benefits of different levels of water quality improvements.
This research is based on a case study of the Karapiro catchment in the North Island of New Zealand. It uses choice analysis to assess people’s preferences and willingness to pay for different levels of water quality improvement in catchment streams. Choice analysis methods ask respondents to choose between one group of environmental services or characteristics, at a given price or cost to the individual, and another group of environmental characteristics at a different price or cost. Each respondent is usually asked to repeat this exercise several times.
The results from this study indicate that respondents would be willing to pay for cleaner water for swimming, for better ecological health (with eels, bullies and smelt present), for the presence of trout and for better clarity such that ‘you can usually see the bottom’. Respondent preferences were strongest for water suitable for swimming, followed by ecological health, presence of trout and clarity.

text: An assessment of the benefits of cleaner streams: A New Zealand case study Water pollution is now considered to be one of the most important environmental issues facing New Zealand. Water quality in rivers, lakes and streams is generally falling alongside the increase in farming intensity, especially in dairying. Currently, technical and regulatory mechanisms to reduce non-point source pollution from agriculture are the focus of an intensive effort involving industry, researchers, regulators and other stakeholders.
The research described in this non-technical paper aims to complement existing knowledge by developing appropriate methodology for valuing water quality improvements in New Zealand. It is envisaged that this type of information will assist the policy process by allowing decision makers to consider both the costs and the benefits of different levels of water quality improvements.
This research is based on a case study of the Karapiro catchment in the North Island of New Zealand. It uses choice analysis to assess people’s preferences and willingness to pay for different levels of water quality improvement in catchment streams. Choice analysis methods ask respondents to choose between one group of environmental services or characteristics, at a given price or cost to the individual, and another group of environmental characteristics at a different price or cost. Each respondent is usually asked to repeat this exercise several times.
The results from this study indicate that respondents would be willing to pay for cleaner water for swimming, for better ecological health (with eels, bullies and smelt present), for the presence of trout and for better clarity such that ‘you can usually see the bottom’. Respondent preferences were strongest for water suitable for swimming, followed by ecological health, presence of trout and clarity.

year: 2010-10

title: The effects of delay to reinforcement and inter-trial interval on fixed-ratio schedule performance

authors: Stuart, Stacey Louisa

abstract: A delay to reinforcement has been found in previous studies to influence the effectiveness of a reinforcer. As the delay duration increases, response rates decrease and post reinforcement pause durations increase. The present study tested whether it was the increase in time between the effective response and delivery of reinforcement, or, the increases in intervals between reinforcers that devalue the reinforcer. This study also compared the ability of two demand equations and MPR to predict response rates when effort required was changed. The effects of varying delay to reinforcement and intertrial interval on behaviour was examined while the time available for responding was kept constant. 
	There were four conditions; 4-s ITI, 4-s delay, 16-s ITI and 16-s delay, and 6 hens responded under each of these conditions in an ascending geometric series of fixed ratio (FR) values. It was shown that hens generally responded at a faster rate in the ITI conditions than the equivalent delay conditions and peak response rates were seen highest in the 16-s ITI condition in accordance with the demand data.  The data was described well by both the demand equations and the MPR equation. While there were inconsistencies among the parameters, there was a moderately strong positive relationships between the parameter values of as and α in the 16-s ITI (r = .51, p = 0.29) and delay (r = .44, p = .44) conditions.

text: The effects of delay to reinforcement and inter-trial interval on fixed-ratio schedule performance A delay to reinforcement has been found in previous studies to influence the effectiveness of a reinforcer. As the delay duration increases, response rates decrease and post reinforcement pause durations increase. The present study tested whether it was the increase in time between the effective response and delivery of reinforcement, or, the increases in intervals between reinforcers that devalue the reinforcer. This study also compared the ability of two demand equations and MPR to predict response rates when effort required was changed. The effects of varying delay to reinforcement and intertrial interval on behaviour was examined while the time available for responding was kept constant. 
	There were four conditions; 4-s ITI, 4-s delay, 16-s ITI and 16-s delay, and 6 hens responded under each of these conditions in an ascending geometric series of fixed ratio (FR) values. It was shown that hens generally responded at a faster rate in the ITI conditions than the equivalent delay conditions and peak response rates were seen highest in the 16-s ITI condition in accordance with the demand data.  The data was described well by both the demand equations and the MPR equation. While there were inconsistencies among the parameters, there was a moderately strong positive relationships between the parameter values of as and α in the 16-s ITI (r = .51, p = 0.29) and delay (r = .44, p = .44) conditions.

year: 2013

title: Spot sampling of nutrient concentrations in the Puarenga catchment, Rotorua

authors: Abell, Jonathan Michael

subjects: New Zealand

abstract: The Centre for Biodiversity and Ecology Research was approached by Tūhourangi Tribal Authority for assistance with measuring water quality in streams in the Puarenga Stream catchment. Water sampling was subsequently undertaken on 18 July 2011 and samples were analysed to determine concentrations of total and dissolved fractions of nitrogen and phosphorus. 
Nitrogen and phosphorus are both essential plant nutrients which, when present in excess, can cause eutrophication and associated water quality decline of freshwaters. High concentrations of dissolved forms of nitrogen can also be toxic to aquatic organisms. Excessive nitrogen and phosphorus concentrations are typically the result of pollution due to human activities, although groundwater in the Central Volcanic Plateau region can have elevated concentrations of phosphorus arising from natural geological sources.
This report summarises the methods used, presents the results and places measured concentrations in context by drawing comparisons with both guideline and regional mean values.

text: Spot sampling of nutrient concentrations in the Puarenga catchment, Rotorua The Centre for Biodiversity and Ecology Research was approached by Tūhourangi Tribal Authority for assistance with measuring water quality in streams in the Puarenga Stream catchment. Water sampling was subsequently undertaken on 18 July 2011 and samples were analysed to determine concentrations of total and dissolved fractions of nitrogen and phosphorus. 
Nitrogen and phosphorus are both essential plant nutrients which, when present in excess, can cause eutrophication and associated water quality decline of freshwaters. High concentrations of dissolved forms of nitrogen can also be toxic to aquatic organisms. Excessive nitrogen and phosphorus concentrations are typically the result of pollution due to human activities, although groundwater in the Central Volcanic Plateau region can have elevated concentrations of phosphorus arising from natural geological sources.
This report summarises the methods used, presents the results and places measured concentrations in context by drawing comparisons with both guideline and regional mean values.

year: 2011-09