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Integrating nutritional immunology. What an organism eats affects both its susceptibility to disease and the community of beneficial microorganisms living within its gut. This project will study how nutrition, immunity and the flora of the gut interact, and whether hosts are able to select a diet that optimises their immune response and gut flora in the face of disease challenges.
Development and implementation of biodiversity information for sustainable management of South Australian groundwater. Clean potable water is one of the most important resources for human health and a successful economy. Increasingly, subterranean aquifers are used for storage and recovery of water. These aquifers contain dynamic ecosystems, but little is known about species composition or about the importance of the presence of various species for water quality. We will use the latest laborator ....Development and implementation of biodiversity information for sustainable management of South Australian groundwater. Clean potable water is one of the most important resources for human health and a successful economy. Increasingly, subterranean aquifers are used for storage and recovery of water. These aquifers contain dynamic ecosystems, but little is known about species composition or about the importance of the presence of various species for water quality. We will use the latest laboratory techniques and DNA identification methods to provide a template for determining ground water diversity and food web dynamics throughout Australia. This project will lead to a better understanding of how to manage ground water in a sustainable manner.Read moreRead less
Functional analysis of Bacillus thuringiensis crystal toxins. Pore-forming toxins, such as anthrax, hemolysin, cholera and diphtheria toxins, are among the most virulent microbial toxins, posing a threat to humans and lifestock. We are using a novel functional approach to test possible lectin and antimicrobial peptide functions of a typical and economically important pore-forming toxin, the crystal endotoxin from Bacillus thuringiensis, to examine why toxicity of the lectin-containing toxin is ....Functional analysis of Bacillus thuringiensis crystal toxins. Pore-forming toxins, such as anthrax, hemolysin, cholera and diphtheria toxins, are among the most virulent microbial toxins, posing a threat to humans and lifestock. We are using a novel functional approach to test possible lectin and antimicrobial peptide functions of a typical and economically important pore-forming toxin, the crystal endotoxin from Bacillus thuringiensis, to examine why toxicity of the lectin-containing toxin is restricted to invertebrates only, while the amphipathic peptide alone is also toxic to many vertebrate cells. The outcome of these experiments has important implications for the sustainable use of biopesticides and for the prevention and containment of infectious diseases.Read moreRead less
Causes and consequences of disease in the habitat forming seaweed Ecklonia radiata. Despite compelling arguments for the increasing importance of disease as a key structuring force in marine communities, we know little about the causes or broad impact of disease for most natural marine systems. This is particularly true for kelp forests, the dominant community type on temperate rocky shores. This project will integrate field ecology with microbiology and modern environmental gene sequencing tech ....Causes and consequences of disease in the habitat forming seaweed Ecklonia radiata. Despite compelling arguments for the increasing importance of disease as a key structuring force in marine communities, we know little about the causes or broad impact of disease for most natural marine systems. This is particularly true for kelp forests, the dominant community type on temperate rocky shores. This project will integrate field ecology with microbiology and modern environmental gene sequencing techniques to characterise the frequency, causative agents and impact of disease on Ecklonia radiata, the dominant seaweed in Australia. This project will further investigate how environmental conditions, including human impacts, modulate disease in this key, habitat forming seaweed.Read moreRead less
Advancing knowledge of microbial symbioses underpinning coral health and reef resilience and predicting their responses to climate change. Coral reefs are complex, diverse ecosystems in which microbial communities form associations with host corals. However, the roles these associations play in coral stress responses are unknown. This project unlocks the black-box of coral microbial complexity and determines how the reef’s smallest members have the greatest influence on reef health.
Effect of predation on virulence traits of opportunistic pathogens. The project aims to determine if increased fitness of bacteria in animal or human hosts (increased virulence) can occur due to indirect rather than direct selective pressure, particularly pressure on bacteria arising from predation by protozoa. Protozoa feed on many pathogenic bacteria (e.g. those that cause cholera and chronic infections) in the ocean, and warming oceans are predicted to increase predation. Knowing the effect o ....Effect of predation on virulence traits of opportunistic pathogens. The project aims to determine if increased fitness of bacteria in animal or human hosts (increased virulence) can occur due to indirect rather than direct selective pressure, particularly pressure on bacteria arising from predation by protozoa. Protozoa feed on many pathogenic bacteria (e.g. those that cause cholera and chronic infections) in the ocean, and warming oceans are predicted to increase predation. Knowing the effect of warming oceans on marine bacteria and the emergence of virulence in bacteria that are subject to predation in the environment can inform design of tools for monitoring the risk of infection outbreaks. Benefits would be realised by academic researchers, clinicians and policy-makers interested in optimising the tracking of infection threats.Read moreRead less
Chemical warfare at small scales: does eukaryotic chemical defense theory fit biofilms? The ecology of bacteria has long been treated separately from the ecology of higher organisms. Thus we do not know whether the ecology of bacteria operates by the same general rules as those of plants and animals. This significantly diminishes our understanding of the natural world, and our capacity to manage our environment. In this project we will systematically test ecological defense theories in bacterial ....Chemical warfare at small scales: does eukaryotic chemical defense theory fit biofilms? The ecology of bacteria has long been treated separately from the ecology of higher organisms. Thus we do not know whether the ecology of bacteria operates by the same general rules as those of plants and animals. This significantly diminishes our understanding of the natural world, and our capacity to manage our environment. In this project we will systematically test ecological defense theories in bacterial systems. Our aim is to merge our understanding of the ecology of these very different organisms. This integration of plant and animal ecology and environmental microbiology is new for both fields, and thus studies such as this one have the potential to put Australia at the forefront of this exciting new approach to our environment.Read moreRead less
Plant : fungal symbioses in Australian forests - new perspectives using laser microdissection. Ericaceae are important components of the Australian flora in many habitats, including forests and fragile alpine regions that are significant to Australia's cultural and natural heritage, and several species are considered threatened. This project addresses the fundamental question of whether networks of symbiotic fungal mycelia act as below-ground bridges between Ericaceae plants and tree roots. If d ....Plant : fungal symbioses in Australian forests - new perspectives using laser microdissection. Ericaceae are important components of the Australian flora in many habitats, including forests and fragile alpine regions that are significant to Australia's cultural and natural heritage, and several species are considered threatened. This project addresses the fundamental question of whether networks of symbiotic fungal mycelia act as below-ground bridges between Ericaceae plants and tree roots. If demonstrated, this would alter current views of carbon and nutrient cycling in Australian forests and provide the basis for better informed decisions for the sustainable management of Australian forest resources. This is particularly important in the context of carbon sequestration and future climate change.Read moreRead less
Stress, virulence and bacterial disease in temperate seaweeds: the rise of the microbes. Climate change is predicted to increase the spread and virulence of pathogens, and decrease the resistance to disease via temperature stress on the hosts. Combined with other human impacts (higher nutrients, pollution), we may be facing a major rise in the effect of disease on natural communities. However, these effects are largely unstudied. We will investigate the impact of marine pathogens on kelps and ....Stress, virulence and bacterial disease in temperate seaweeds: the rise of the microbes. Climate change is predicted to increase the spread and virulence of pathogens, and decrease the resistance to disease via temperature stress on the hosts. Combined with other human impacts (higher nutrients, pollution), we may be facing a major rise in the effect of disease on natural communities. However, these effects are largely unstudied. We will investigate the impact of marine pathogens on kelps and other seaweeds when they are stressed by temperature, elevated nutrients or other anthropogenic stressors. Kelp are the 'trees of the oceans', the organisms responsible for creating much of the habitat that fishes and other organisms live in. The loss of kelp forests due to disease would radically change these environments.Read moreRead less
Dispersal and colonisation in eukaryotes and prokaryotes. The problem of pest or disease organisms for humanity is fundamentally a problem of unwanted colonisation. For example, colonisation of the surfaces of human tissues by bacterial biofilms is responsible for up to 70% of bacterial infections; colonisation of the surfaces of boat hulls by marine organisms costs the marine shipping industry > $5 billion per year. This proposal will generate fundamental information on the ability of both bac ....Dispersal and colonisation in eukaryotes and prokaryotes. The problem of pest or disease organisms for humanity is fundamentally a problem of unwanted colonisation. For example, colonisation of the surfaces of human tissues by bacterial biofilms is responsible for up to 70% of bacterial infections; colonisation of the surfaces of boat hulls by marine organisms costs the marine shipping industry > $5 billion per year. This proposal will generate fundamental information on the ability of both bacteria and higher organisms to disperse and colonise surfaces, allowing for the development of novel technologies for the prevention of unwanted colonisation of surfaces. Read moreRead less