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Distinguishing among patterns of extinction and speciation through geological and climatic change: a molecular modelling approach. This research will enhance our understanding of the ancient origins of Australia's unique floral heritage. By developing new molecular modelling methods, it will strengthen Australia's position at the cutting edge of evolutionary phylogenetics. When Australia separated from Gondwana by continental drift 32 million years ago, the changed ocean circulation patterns tri ....Distinguishing among patterns of extinction and speciation through geological and climatic change: a molecular modelling approach. This research will enhance our understanding of the ancient origins of Australia's unique floral heritage. By developing new molecular modelling methods, it will strengthen Australia's position at the cutting edge of evolutionary phylogenetics. When Australia separated from Gondwana by continental drift 32 million years ago, the changed ocean circulation patterns triggered global climate change. The result was turnover of biota world-wide and dramatic changes within Australia. We will develop new insights into the rate and mode of these changes that will have international significance. Understanding the long-term turnover of flora from previous global climate changes will help to predict the impact of current and future climate change.Read moreRead less
Leaf respiration under drought: a global perspective. Predicting future net carbon exchange is necessary for better management of vegetation resources by Australia. Incorporating the responses of plant respiration to drought and temperature is crucial for predicting future rates of net carbon exchange. Using laboratory and field studies, this research will develop an understanding of how water availability and temperature impact on plant respiration of a broad range of economically important and ....Leaf respiration under drought: a global perspective. Predicting future net carbon exchange is necessary for better management of vegetation resources by Australia. Incorporating the responses of plant respiration to drought and temperature is crucial for predicting future rates of net carbon exchange. Using laboratory and field studies, this research will develop an understanding of how water availability and temperature impact on plant respiration of a broad range of economically important and ecologically relevant plant species. Equations will be formulated that will improve how modellers calculate drought-dependent variations in plant respiration (and thus plant productivity), thereby improving predictions for a future, warmer world.Read moreRead less
Out of the darkness: predicting rates of respiration of illuminated leaves along nutrient gradients. Our research will greatly assist in predictions of future net carbon exchange necessary if Australia is to better manage its vegetation resources. Crucial to predicting future rates of net carbon exchange is an understanding of how climate and nutrients impact on leaf respiration. Our research will develop an understanding of how light, temperature and phosphorus (the most widespread, limiting nu ....Out of the darkness: predicting rates of respiration of illuminated leaves along nutrient gradients. Our research will greatly assist in predictions of future net carbon exchange necessary if Australia is to better manage its vegetation resources. Crucial to predicting future rates of net carbon exchange is an understanding of how climate and nutrients impact on leaf respiration. Our research will develop an understanding of how light, temperature and phosphorus (the most widespread, limiting nutrient in Australia) impact on leaf respiration of a broad range of contrasting plants representative of several diverse Australian ecosystems. We will develop equations that will allow modellers to better predict climate/nutrient dependent variations in leaf respiration (and thus rates of plant productivity), both now and in the future.Read moreRead less
Climate dependence of plant respiration in a warmer, drier world. This research will greatly assist in predictions of future net carbon exchange that are necessary if Australia is to better manage its vegetation resources. Crucial to predicting future rates of net carbon exchange is an understanding of how drought and long-term changes in temperature impact on plant respiration. Using laboratory and field studies, this research will develop an understanding of how water availability and temperat ....Climate dependence of plant respiration in a warmer, drier world. This research will greatly assist in predictions of future net carbon exchange that are necessary if Australia is to better manage its vegetation resources. Crucial to predicting future rates of net carbon exchange is an understanding of how drought and long-term changes in temperature impact on plant respiration. Using laboratory and field studies, this research will develop an understanding of how water availability and temperature impact on plant respiration of a broad range of economically important and ecologically relevant plant species. Equations will be formulated that allow modellers to better predict drought-dependent variations in plant respiration (and thus plant productivity), both now and in a future, warmer world.Read moreRead less
Global change in the sub-antarctic - Temperature response of vascular plant species from Macquarie and Heard Islands. The aim is to understand how subantarctic and alpine plant species that have evolved, respectively, in equable and highly variable temperature regimes will respond to increase in temperature resulting from global warming and climate change. The proposed project will identify species that are likely to benefit from, or are vulnerable to, rising temperatures. Processes underlying a ....Global change in the sub-antarctic - Temperature response of vascular plant species from Macquarie and Heard Islands. The aim is to understand how subantarctic and alpine plant species that have evolved, respectively, in equable and highly variable temperature regimes will respond to increase in temperature resulting from global warming and climate change. The proposed project will identify species that are likely to benefit from, or are vulnerable to, rising temperatures. Processes underlying adaptation and acclimation of plant growth to increasing temperature will also be identified. These results will be significant for conservation of biodiversity and management of Australia's unique subantarctic and alpine flora.Read moreRead less
Tolerance of temperature extremes under drought: linking physiological processes with morphological constraints on leaf function. Freezing temperatures affect over 70% of Australia. Each year frosts cause substantial damage to agriculture and forestry. We will examine how decrease in hydraulic conduit diameter increases freeze tolerance in native woody species and quantify impacts of this tolerance on productivity of leaves. The results have application in managing temperate woody vegetation un ....Tolerance of temperature extremes under drought: linking physiological processes with morphological constraints on leaf function. Freezing temperatures affect over 70% of Australia. Each year frosts cause substantial damage to agriculture and forestry. We will examine how decrease in hydraulic conduit diameter increases freeze tolerance in native woody species and quantify impacts of this tolerance on productivity of leaves. The results have application in managing temperate woody vegetation under current and future climate scenarios. By improving understanding of the behaviour of water in leaves during freezing, we will contribute to improved models of physical stresses and strains in biological tissues during freezing, which find application in cryo-storage of biological materials important in agriculture, medicine, and conservation.Read moreRead less
Re-evaluating the role of tannins in Australian forest ecosystems. As atmospheric CO2 concentrations rise, eucalypts will respond by decreasing the amount of protein in the leaves and increasing the concentrations of toxins called tannins. Together this will have the effect of making the leaves harder for herbivores to eat and slower to break down on the forest floor. We have developed a new way of measuring these effects and will use it to show which eucalypt communities climate change will mo ....Re-evaluating the role of tannins in Australian forest ecosystems. As atmospheric CO2 concentrations rise, eucalypts will respond by decreasing the amount of protein in the leaves and increasing the concentrations of toxins called tannins. Together this will have the effect of making the leaves harder for herbivores to eat and slower to break down on the forest floor. We have developed a new way of measuring these effects and will use it to show which eucalypt communities climate change will most affect and so which forests will become less able to support fauna. Apart from contributing to the better management of Australian forests, this project also enhances the National Carbon Accounting System by measuring how tannins influence litter decomposition and explaining the link with leaf chemistry.Read moreRead less
Climate change and cryptic biodiversity in the Australian arid-zone: Molecular phylogeny-based assessment of conservation priorities. Australia's arid zone comprises two thirds of the country yet from a climate change, biodiversity, and conservation point of view it has received little attention relative to eastern Australia. The project will address broad questions in evolutionary biology with unique Australian systems, make a world class contribution to the fields of phylogeography, molecular ....Climate change and cryptic biodiversity in the Australian arid-zone: Molecular phylogeny-based assessment of conservation priorities. Australia's arid zone comprises two thirds of the country yet from a climate change, biodiversity, and conservation point of view it has received little attention relative to eastern Australia. The project will address broad questions in evolutionary biology with unique Australian systems, make a world class contribution to the fields of phylogeography, molecular phylogenetics and conservation genetics and contribute substantially to the continued training of high quality research students and postdoctoral fellows. The project directly addresses two National Priority Research Areas and will supply of critical information to the eight biggest of the 57 Natural Resource Management Regions. Read moreRead less
Comparative phylogeography and conservation genetics of Australia's biodiversity hotspot. Southwestern Australia has been identified as one of the world's 25 biodiversity hotspots. The project will address broad questions in evolutionary biology with unique Australian systems, make a world class contribution to the fields of phylogeography, molecular phylogenetics and conservation genetics and contribute substantially to the continued training of high quality research students. I am a foundation ....Comparative phylogeography and conservation genetics of Australia's biodiversity hotspot. Southwestern Australia has been identified as one of the world's 25 biodiversity hotspots. The project will address broad questions in evolutionary biology with unique Australian systems, make a world class contribution to the fields of phylogeography, molecular phylogenetics and conservation genetics and contribute substantially to the continued training of high quality research students. I am a foundation member of the new ARC Environmental Futures Network: Discovering the Past and Present to Shape the Future. One of its primary listed objectives is "documenting Australia's biodiversity: recognising, understanding and managing key hotspots". My research plan fits in precisely with this research agenda. Read moreRead less
Australia's monsoon tropical flora: invader or relict? The monsoonal tropics is a large region with unique yet poorly understood biodiversity. It is undergoing rapid agricultural, urban and tourist development, all of which threaten the sustainability of that biodiversity. The region includes three World Heritage areas, all with flora in their listed values: Kakadu National Park, Purnulu NP (Bungle Bungles) and Riversleigh. Additionally, the Kimberley is considered one of the last great wilderne ....Australia's monsoon tropical flora: invader or relict? The monsoonal tropics is a large region with unique yet poorly understood biodiversity. It is undergoing rapid agricultural, urban and tourist development, all of which threaten the sustainability of that biodiversity. The region includes three World Heritage areas, all with flora in their listed values: Kakadu National Park, Purnulu NP (Bungle Bungles) and Riversleigh. Additionally, the Kimberley is considered one of the last great wilderness areas in the world. This project will help us understand the evolutionary and geographic origins of the biodiversity of the monsoonal tropics, including the World Heritage areas, and it will identify those components that are uniquely Australian and therefore have the greatest heritage values.Read moreRead less