Unravelling soil carbon response to warming in fire-affected ecosystems. This project aims to reveal the continental pattern of soil carbon (C) response to warming in fire-affected ecosystems across Australia and to unravel the biogeochemical mechanisms underlying fire’s role in shaping the temperature sensitivity of soil respiration. Fire has modified over 40% of the Earth’s land surface and wildfire frequency is predicted to increase under global warming. This project expects to generate new k ....Unravelling soil carbon response to warming in fire-affected ecosystems. This project aims to reveal the continental pattern of soil carbon (C) response to warming in fire-affected ecosystems across Australia and to unravel the biogeochemical mechanisms underlying fire’s role in shaping the temperature sensitivity of soil respiration. Fire has modified over 40% of the Earth’s land surface and wildfire frequency is predicted to increase under global warming. This project expects to generate new knowledge on how fire influences soil-to-atmosphere C fluxes in a warmer climate using a multi-disciplinary approach. Expected outcomes include an enhanced capacity to predict the terrestrial ecosystem-to-atmosphere C fluxes and their feedbacks to climate under increasing frequency of fire using Earth-system models. Read moreRead less
Hydraulic control on water use, growth and survival in tropical rainforest. This project aims to measure drought-related limits to water transport in the woody xylem tissue of trees in Australian tropical rainforests, to understand how this influences tree water use, photosynthesis, health and mortality risk. Tropical rainforests are sensitive to climate variability, especially drought, but this sensitivity is poorly understood, despite large effects regionally and globally. This project will co ....Hydraulic control on water use, growth and survival in tropical rainforest. This project aims to measure drought-related limits to water transport in the woody xylem tissue of trees in Australian tropical rainforests, to understand how this influences tree water use, photosynthesis, health and mortality risk. Tropical rainforests are sensitive to climate variability, especially drought, but this sensitivity is poorly understood, despite large effects regionally and globally. This project will compare forests that contrast strongly in seasonal drought stress, and use the information to develop a model designed for species-diverse forest, with subsequent potential global application. The understanding gained will enable widely applicable advances designed to feed through rapidly to regional- and global-scale models that inform land use, economic and social policy-making.Read moreRead less
Unsaturation of vapour pressure inside leaves: fundamental, but unknown. This project aims to determine when and to what extent the air inside leaves becomes unsaturated with water vapour. All current interpretation and modelling of leaf gas exchange assumes saturation under all circumstances. Compelling evidence has been obtained that suggests this is not true under moderate air vapour pressure deficits. A novel technique will be employed to assess the water vapour concentration of the air insi ....Unsaturation of vapour pressure inside leaves: fundamental, but unknown. This project aims to determine when and to what extent the air inside leaves becomes unsaturated with water vapour. All current interpretation and modelling of leaf gas exchange assumes saturation under all circumstances. Compelling evidence has been obtained that suggests this is not true under moderate air vapour pressure deficits. A novel technique will be employed to assess the water vapour concentration of the air inside leaves based on stable isotope analysis of carbon dioxide and water vapour exchanged between leaves and air. The project is expected to provide fundamental knowledge about how stomata regulate photosynthesis and water use, with significant implications for modelling vegetation function and for improving the performance of crop plants.Read moreRead less
Will stomatal responses to humidity and carbon dioxide constrain tropical forest productivity as atmospheric carbon dioxide rises? This project will investigate two physiological processes that will partly determine growth responses of tropical forest trees to rising atmospheric carbon dioxide. The project will produce equations summarising physiological responses that can be incorporated into process-based models of tropical forest productivity.
Constructing robust climate proxies to explore human and primate evolution. This project will build the requisite foundation to resolve whether variable climate change sparked the origins of humans and our great ape forebears. Scientists endeavor to recover ancient environmental records to examine this influential idea, but have lacked the means to do so at the scale of a human lifespan. This multidisciplinary effort will harness groundbreaking advances pioneered by our collaborative team to pro ....Constructing robust climate proxies to explore human and primate evolution. This project will build the requisite foundation to resolve whether variable climate change sparked the origins of humans and our great ape forebears. Scientists endeavor to recover ancient environmental records to examine this influential idea, but have lacked the means to do so at the scale of a human lifespan. This multidisciplinary effort will harness groundbreaking advances pioneered by our collaborative team to produce the first fine-scaled climate proxies from the teeth of humans’ closest living relatives. Documenting climate variation across diverse landscapes promises to transform studies of prehistoric ecosystems and past behaviour from omnipresent fossilised teeth, providing further insight into humanity’s unprecedented success.Read moreRead less
Thermal stratification, overturning and mixing in riverine environments. Thermal stratification is common in Australia's rivers due to our hot, drought-prone climate and high human demands relative to available supply, which has led to a significant reduction in flows relative to natural levels. Thermal stratification inhibits mixing, creating stagnant conditions characterised by low oxygen levels and increased concentrations of contaminants, leading to algal blooms, fish kills and systemic dama ....Thermal stratification, overturning and mixing in riverine environments. Thermal stratification is common in Australia's rivers due to our hot, drought-prone climate and high human demands relative to available supply, which has led to a significant reduction in flows relative to natural levels. Thermal stratification inhibits mixing, creating stagnant conditions characterised by low oxygen levels and increased concentrations of contaminants, leading to algal blooms, fish kills and systemic damage to ecosystems. The aim of this project is to develop predictive models for the effects of physical processes such as night-time cooling, wind, turbulence and currents on riverine thermal stratification. This is expected to enable a more accurate determination of the flow rates required to maintain the health of our river systems.Read moreRead less
Linking individual traits, the gut microbiome and parasite load in wildlife. This project aims to apply principles of community ecology to the gut microbiome of an urban exploiter – the common brushtail possum - to reveal how animal traits influence individual variation in the load of gut parasites that cause disease in both humans and wildlife. By combining assays defining the behavioural and physiological states of individuals with sophisticated analyses of their gut microbiome, our project wi ....Linking individual traits, the gut microbiome and parasite load in wildlife. This project aims to apply principles of community ecology to the gut microbiome of an urban exploiter – the common brushtail possum - to reveal how animal traits influence individual variation in the load of gut parasites that cause disease in both humans and wildlife. By combining assays defining the behavioural and physiological states of individuals with sophisticated analyses of their gut microbiome, our project will provide a new, yet crucial, perspective on how and why diseases spread. Our discoveries will help understand and manage the burden of infectious diseases from parasites in and beyond our cities and across the human-wildlife interface; essential for improving human and wildlife health in an increasingly urbanised Australia.Read moreRead less
On the physiology of plant transpiration. This project aims to better understand plant transpiration. It is significant from both a basic and a practical perspective. It intends to solve a conundrum of the biophysics of the evaporative sites within leaves. That is, in dry air, the relative humidity of intercellular air spaces suggests much lower liquid water potentials than those typically measured. At a practical level, the failure to sustain transpiration in dry conditions leads to desiccation ....On the physiology of plant transpiration. This project aims to better understand plant transpiration. It is significant from both a basic and a practical perspective. It intends to solve a conundrum of the biophysics of the evaporative sites within leaves. That is, in dry air, the relative humidity of intercellular air spaces suggests much lower liquid water potentials than those typically measured. At a practical level, the failure to sustain transpiration in dry conditions leads to desiccation and tissue death, and plants differ in this vulnerability. The aim is to apply a novel nanoparticle technique to measure the water potential distribution within the leaf, identify hydraulic resilience attributes, and develop a modern theory of optimal transpiration under varying conditions.Read moreRead less
Towards 2050 - managing recovery of Australia's coral reefs. The coral reefs of Australia contribute over $6 bn each year to the economy. However, the reefs of Australia, in addition to those worldwide, are threatened by coral bleaching driven by anthropogenic climate change. If we are to preserve the economic, social and ecosystem value of these environments, it is essential that we are able to better manage the recovery of reefs from bleaching events. This project will utilise a variety of mul ....Towards 2050 - managing recovery of Australia's coral reefs. The coral reefs of Australia contribute over $6 bn each year to the economy. However, the reefs of Australia, in addition to those worldwide, are threatened by coral bleaching driven by anthropogenic climate change. If we are to preserve the economic, social and ecosystem value of these environments, it is essential that we are able to better manage the recovery of reefs from bleaching events. This project will utilise a variety of multi-disciplinary approaches, ranging from future climate models, historical satellite data to in-field experimentation to fill fundamental knowledge gaps in our understanding of coral bleaching recovery and delivery a variety of management and stakeholder relevant outputs.Read moreRead less
The capacity of forests to protect regional climate under global warming. The project plans to develop a new understanding of the capacity of forests to increase moisture recycling, which enhances cloud and precipitation processes and exerts a cooling influence on the land surface. Deforestation and climate change are major global challenges. The role of forests in the carbon cycle is well recognised. Less attention is given to their role in the energy and water cycles, and their capacity to reg ....The capacity of forests to protect regional climate under global warming. The project plans to develop a new understanding of the capacity of forests to increase moisture recycling, which enhances cloud and precipitation processes and exerts a cooling influence on the land surface. Deforestation and climate change are major global challenges. The role of forests in the carbon cycle is well recognised. Less attention is given to their role in the energy and water cycles, and their capacity to regulate regional climate. The project plans to apply an innovative land use-climate scenario modelling to quantify the impacts of deforestation and afforestation on the climate of northern Australia and south-east Asia under global warming. It also plans to evaluate the capacity of restoring forests to offset regional climate change, to inform regional land use planning and climate mitigation and adaptation.Read moreRead less