title: Removal of invasive fish and exclusion of koi carp from Lake Ohinewai

authors: Tempero, Grant Wayne

abstract: The lower Waikato River floodplain contains many shallow lakes. The floodplain has been highly developed for pastoral agriculture, primarily dairy farming, resulting in extensive drainage and flood control measures to regulate river and lake levels. Most lakes have degraded water quality as a result of nutrient and sediment enrichment, and the additional impacts of pest fish such as koi carp, goldfish, catfish and rudd have generally contribute9 to the total collapse of submerged macrophytes and progression to a highly eutrophic state. Of all New Zealand lakes monitored regularly for water quality, around 25% of those categorised as supertrophic or hypertrophic are on the Waikato River floodplain (Verburg et al. 2010).
Lake Ohinewai is a shallow (4.5 m depth), 16.8 ha lake on the floodplain. The lake has a 331 ha catchment that is primarily flat and dominated by intensive pastoral farming with several inlet drains. A single outlet drain leads to Lake Waikare via Lake Rotokawau and passes through a circular road culvert 930 m from the lake outlet. Lake Ohinewai deteriorated from a stable oligotrophic (macrophyte-dominated) state to a stable eutrophic (algal-dominated) state during the early 1990s, and now lacks aquatic macrophytes. In 1981, 80% of the lake was covered in aquatic macrophytes but by 1991 none remained (Edwards et al. 2005). Invasion by koi carp over this period was implicated in this change of state.

text: Removal of invasive fish and exclusion of koi carp from Lake Ohinewai The lower Waikato River floodplain contains many shallow lakes. The floodplain has been highly developed for pastoral agriculture, primarily dairy farming, resulting in extensive drainage and flood control measures to regulate river and lake levels. Most lakes have degraded water quality as a result of nutrient and sediment enrichment, and the additional impacts of pest fish such as koi carp, goldfish, catfish and rudd have generally contribute9 to the total collapse of submerged macrophytes and progression to a highly eutrophic state. Of all New Zealand lakes monitored regularly for water quality, around 25% of those categorised as supertrophic or hypertrophic are on the Waikato River floodplain (Verburg et al. 2010).
Lake Ohinewai is a shallow (4.5 m depth), 16.8 ha lake on the floodplain. The lake has a 331 ha catchment that is primarily flat and dominated by intensive pastoral farming with several inlet drains. A single outlet drain leads to Lake Waikare via Lake Rotokawau and passes through a circular road culvert 930 m from the lake outlet. Lake Ohinewai deteriorated from a stable oligotrophic (macrophyte-dominated) state to a stable eutrophic (algal-dominated) state during the early 1990s, and now lacks aquatic macrophytes. In 1981, 80% of the lake was covered in aquatic macrophytes but by 1991 none remained (Edwards et al. 2005). Invasion by koi carp over this period was implicated in this change of state.

year: 2015

title: Numerical confirmations of joint spike transitions in G (2) cosmologies

authors: Lim, Woei Chet

subjects: Science & Technology

abstract: We produce numerical evidence that the joint spike transitions between Kasner eras of G2 cosmologies are described by the non-orthogonally transitive G2 spike solution. A new matching procedure is developed for this purpose.

text: Numerical confirmations of joint spike transitions in G (2) cosmologies We produce numerical evidence that the joint spike transitions between Kasner eras of G2 cosmologies are described by the non-orthogonally transitive G2 spike solution. A new matching procedure is developed for this purpose.

year: 2022-03-17

title: Treatment and survival disparities by ethnicity in New Zealand women with stage I-III breast cancer tumour subtypes

authors: Lawrenson, Ross

subjects: Science & Technology

abstract: Purpose
This study aims to look at the distribution of different subtypes of stage I–III breast cancer in Māori and Pacific versus non-Māori/Pacific women, and to examine cancer outcomes by ethnicity within these different subtypes.

Method
This study included 9,015 women diagnosed with stage I–III breast cancer between June 2000 and May 2013, recorded in the combined Waikato and Auckland Breast Cancer Registers, who had complete data on ER, PR and HER2 status. Five ER/PR/HER2 subtypes were defined. Kaplan–Meier method and Cox proportional hazards model were used to examine ethnic disparities in breast cancer-specific survival.

Results
Of the 9,015 women, 891 were Māori, 548 were Pacific and 7,576 others. Both Māori and Pacific women were less likely to have triple negative breast cancer compared to others (8.6, 8.9 vs. 13.0%). Pacific women were more than twice as likely to have ER−, PR− and HER2+ cancer than Māori and others (14.2 vs. 6.0%, 6.7%). After adjustment for age, year of diagnosis, stage, grade and treatment, the hazard ratios of breast cancer-specific mortality for Māori and Pacific women with ER+, PR+ and HER2− were 1.52 (95% CI 1.06–2.18) and 1.55 (95% CI 1.04–2.31) compared to others, respectively. Māori women with HER2+ cancer were twice more likely to die of their cancer than others.

Conclusions
Outcomes for Māori and Pacific women could be improved by better treatment regimens especially for those with HER2+ breast cancer and for women with ER+, PR+ and HER2− breast cancer.

text: Treatment and survival disparities by ethnicity in New Zealand women with stage I-III breast cancer tumour subtypes Purpose
This study aims to look at the distribution of different subtypes of stage I–III breast cancer in Māori and Pacific versus non-Māori/Pacific women, and to examine cancer outcomes by ethnicity within these different subtypes.

Method
This study included 9,015 women diagnosed with stage I–III breast cancer between June 2000 and May 2013, recorded in the combined Waikato and Auckland Breast Cancer Registers, who had complete data on ER, PR and HER2 status. Five ER/PR/HER2 subtypes were defined. Kaplan–Meier method and Cox proportional hazards model were used to examine ethnic disparities in breast cancer-specific survival.

Results
Of the 9,015 women, 891 were Māori, 548 were Pacific and 7,576 others. Both Māori and Pacific women were less likely to have triple negative breast cancer compared to others (8.6, 8.9 vs. 13.0%). Pacific women were more than twice as likely to have ER−, PR− and HER2+ cancer than Māori and others (14.2 vs. 6.0%, 6.7%). After adjustment for age, year of diagnosis, stage, grade and treatment, the hazard ratios of breast cancer-specific mortality for Māori and Pacific women with ER+, PR+ and HER2− were 1.52 (95% CI 1.06–2.18) and 1.55 (95% CI 1.04–2.31) compared to others, respectively. Māori women with HER2+ cancer were twice more likely to die of their cancer than others.

Conclusions
Outcomes for Māori and Pacific women could be improved by better treatment regimens especially for those with HER2+ breast cancer and for women with ER+, PR+ and HER2− breast cancer.

year: 2017