title: A metabolic theory of ecology applied to temperature and mass dependence of N and P excretion by common carp

authors: Morgan, Dai K.J.

subjects: Body size

abstract: Our study used a metabolic theory of ecology (MTE) to explore scaling of metabolic rates by body size and temperature, and to predict nutrient excretion by common carp (Cyprinus carpio). At high biomasses, common carp have negative impacts on water quality, and one mechanism is excretion of the nutrients N and P. We measured whole-body and mass-specific excretion rates during summer and winter for fish of different sizes (wet mass range 28-1,196 g) to produce an allometric scaling model capable of predicting excretion at different temperatures. We found positive relationships between both dissolved and total nutrient concentrations and fish wet mass in summer and winter, with greater excretion rates in summer (mean water temperature 24.2°C) than in winter (mean water temperature 9.2°C). Mass-specific excretion rates decreased with increasing fish size, consistent with the MTE, and the temperature-adjusted model explained more variation for N excretion than for P. The proportion of dissolved nutrients (NH4 and PO4) to total nutrients increased with increasing fish size. The significance of these models is that they can be used to predict population-based nutrient excretion by common carp when thermal history, fish density and size distribution in a water body are known.

text: A metabolic theory of ecology applied to temperature and mass dependence of N and P excretion by common carp Our study used a metabolic theory of ecology (MTE) to explore scaling of metabolic rates by body size and temperature, and to predict nutrient excretion by common carp (Cyprinus carpio). At high biomasses, common carp have negative impacts on water quality, and one mechanism is excretion of the nutrients N and P. We measured whole-body and mass-specific excretion rates during summer and winter for fish of different sizes (wet mass range 28-1,196 g) to produce an allometric scaling model capable of predicting excretion at different temperatures. We found positive relationships between both dissolved and total nutrient concentrations and fish wet mass in summer and winter, with greater excretion rates in summer (mean water temperature 24.2°C) than in winter (mean water temperature 9.2°C). Mass-specific excretion rates decreased with increasing fish size, consistent with the MTE, and the temperature-adjusted model explained more variation for N excretion than for P. The proportion of dissolved nutrients (NH4 and PO4) to total nutrients increased with increasing fish size. The significance of these models is that they can be used to predict population-based nutrient excretion by common carp when thermal history, fish density and size distribution in a water body are known.

year: 2013

title: Trauma-informed approaches for research in higher education: a guiding framework

authors: McChesney, Katrina

subjects: higher education

abstract: Trauma-informed practice is gaining increasing prominence across a range of sectors, including education. Since the COVID-19 pandemic, trauma has been increasingly considered in higher education settings, yet this has rarely extended beyond consideration of teaching practice. Trauma also needs to be considered when planning and conducting research in the field of higher education. This conceptual paper therefore explores what trauma-informed research in higher education might look like and why this is important as part of ensuring that all higher education research is safe and inclusive. The paper reviews existing literature connecting trauma with higher education, then draws on published guidelines for trauma-informed research in other settings to propose a framework for trauma-informed research in higher education. The framework comprises seven guiding principles: (1) anticipate the likely presence of trauma-affected people without requiring disclosure; (2) ensure researchers have a foundational understanding of trauma; (3) imbue a trauma-informed perspective across existing methodologies and methods; (4) reconceptualise the researcher – participant relationship; (5) design research to maximize participant agency, safety, and wellbeing; (6) support researcher safety and wellbeing; and (7) attend to intersectionality. It is hoped that the framework presented in this paper will support increased use of trauma-informed approaches within higher education research.

text: Trauma-informed approaches for research in higher education: a guiding framework Trauma-informed practice is gaining increasing prominence across a range of sectors, including education. Since the COVID-19 pandemic, trauma has been increasingly considered in higher education settings, yet this has rarely extended beyond consideration of teaching practice. Trauma also needs to be considered when planning and conducting research in the field of higher education. This conceptual paper therefore explores what trauma-informed research in higher education might look like and why this is important as part of ensuring that all higher education research is safe and inclusive. The paper reviews existing literature connecting trauma with higher education, then draws on published guidelines for trauma-informed research in other settings to propose a framework for trauma-informed research in higher education. The framework comprises seven guiding principles: (1) anticipate the likely presence of trauma-affected people without requiring disclosure; (2) ensure researchers have a foundational understanding of trauma; (3) imbue a trauma-informed perspective across existing methodologies and methods; (4) reconceptualise the researcher – participant relationship; (5) design research to maximize participant agency, safety, and wellbeing; (6) support researcher safety and wellbeing; and (7) attend to intersectionality. It is hoped that the framework presented in this paper will support increased use of trauma-informed approaches within higher education research.

year: 2025

title: Ka Pū Te Ruha, Ka Hao Te Rangatahi: Maori identities in the twenty-first century

authors: Kukutai, Tahu

abstract: These social divides and problems are at the heart of this text.

text: Ka Pū Te Ruha, Ka Hao Te Rangatahi: Maori identities in the twenty-first century These social divides and problems are at the heart of this text.

year: 2017-02