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The Geometry of Genetic Limits to Evolutionary Change. Genetic limits to evolutionary change are a fundamental issue for plant and animal improvement, as well as understanding how natural populations may respond to human-induced changes such as habitat degradation and climate change. Because we still know very little about how genetic variation is distributed among the multiple traits that are likely to respond to selection in such circumstances, we have no way of directly measuring the evoluti ....The Geometry of Genetic Limits to Evolutionary Change. Genetic limits to evolutionary change are a fundamental issue for plant and animal improvement, as well as understanding how natural populations may respond to human-induced changes such as habitat degradation and climate change. Because we still know very little about how genetic variation is distributed among the multiple traits that are likely to respond to selection in such circumstances, we have no way of directly measuring the evolutionary potential of any natural population. In this proposal, we develop the theory, statistical tools, and experimental designs to investigate the nature and prevalence of these multivariate genetic constraints.Read moreRead less
Sexual selection and the accumulation of deleterious mutations. Mutation is the ultimate source of all genetic variation. Understanding the nature of mutation, its frequency, the distribution of effects, and the forces of selection that remove mutational load from populations is therefore a central concern of genetics. The accumulation of mutational load in endangered species and in human populations, where the forces of selection tend not to operate, has the potential to create serious proble ....Sexual selection and the accumulation of deleterious mutations. Mutation is the ultimate source of all genetic variation. Understanding the nature of mutation, its frequency, the distribution of effects, and the forces of selection that remove mutational load from populations is therefore a central concern of genetics. The accumulation of mutational load in endangered species and in human populations, where the forces of selection tend not to operate, has the potential to create serious problems. We will determine the efficacy of sexual selection in preventing deleterious mutations from accumulating in populations. This project will provide research training opportunities in quantitative genetics, an enabling discipline in Biology.Read moreRead less
MULTIVARIATE QUANTITATIVE GENETICS AND THE LEK PARADOX. This research program as the potential to change the way evolutionary biologists view how selection changes the available patterns of genetic variance and covariance. In particular, it will highlight the possibility that a lack of genetic variance in multi-trait systems may be an important mechanism that limits the response to selection. It is therefore addresses a fundamental problem in quantitative genetics that underlies selection li ....MULTIVARIATE QUANTITATIVE GENETICS AND THE LEK PARADOX. This research program as the potential to change the way evolutionary biologists view how selection changes the available patterns of genetic variance and covariance. In particular, it will highlight the possibility that a lack of genetic variance in multi-trait systems may be an important mechanism that limits the response to selection. It is therefore addresses a fundamental problem in quantitative genetics that underlies selection limits in evolution and agriculture.Read moreRead less
Patterns of connectivity and hot-spots of recruitment: a basis for prioritising high value coastal rivers. Provision of water for agricultural, industrial and residential use is becoming increasingly difficult in Australia. By determining the need for important migratory fish species to have access to marine conditions, this project aims to assist managers to identify river systems where changing flow patterns will be particularly detrimental. The project will provide information about the ne ....Patterns of connectivity and hot-spots of recruitment: a basis for prioritising high value coastal rivers. Provision of water for agricultural, industrial and residential use is becoming increasingly difficult in Australia. By determining the need for important migratory fish species to have access to marine conditions, this project aims to assist managers to identify river systems where changing flow patterns will be particularly detrimental. The project will provide information about the need for artificial opening of estuary mouths, fish ladders and other practical means to ensure the continued survival of these species. Read moreRead less
Evolutionary venomics: Venom system diversification in the animal kingdom. This proposal represents a tremendous opportunity for biodiscovery from the Australian toxic fauna. This will be achieved through the researcher's unique approach of investigating previously unmapped venom systems for divergent, bioactive proteins. An understanding of venomous animal protein evolution has practical implications for the treatment of envenomations - an enormous problem in Australia - as well as great pot ....Evolutionary venomics: Venom system diversification in the animal kingdom. This proposal represents a tremendous opportunity for biodiscovery from the Australian toxic fauna. This will be achieved through the researcher's unique approach of investigating previously unmapped venom systems for divergent, bioactive proteins. An understanding of venomous animal protein evolution has practical implications for the treatment of envenomations - an enormous problem in Australia - as well as great potential in drug discovery and other commercial applications. This project will provide Australian graduate and post-graduate students with finely tuned skills in cutting edge methodological techniques and a fluent understanding of molecular evolution, preparing them to be internationally competitive scientists.Read moreRead less
Genetical Genomics of Mutational Variance. Mutation is the ultimate source of all genetic variation. Understanding the nature of mutation, its frequency, the distribution of effects, and the forces of selection that remove mutational load from populations is therefore a central concern of genetics. The accumulation of mutational load both in endangered species and human populations, where the natural forces of selection tend not to operate, has the potential to create serious problems in these p ....Genetical Genomics of Mutational Variance. Mutation is the ultimate source of all genetic variation. Understanding the nature of mutation, its frequency, the distribution of effects, and the forces of selection that remove mutational load from populations is therefore a central concern of genetics. The accumulation of mutational load both in endangered species and human populations, where the natural forces of selection tend not to operate, has the potential to create serious problems in these populations. The goal is to understand what types of mutations are targeted by selection at the gene expression level and why.Read moreRead less
The Genomic Dimensionality of the Response to Natural Selection. Many future advances in agriculture and medicine, as well as an understanding of adaptive evolution in natural and pest populations will require discovering the genes that regulate the expression of complex traits. Microarray technology is at the forefront of modern genomics, but despite its promise, is currently restricted in its utility by significant analytical problems associated with the analysis of the large number of gene ex ....The Genomic Dimensionality of the Response to Natural Selection. Many future advances in agriculture and medicine, as well as an understanding of adaptive evolution in natural and pest populations will require discovering the genes that regulate the expression of complex traits. Microarray technology is at the forefront of modern genomics, but despite its promise, is currently restricted in its utility by significant analytical problems associated with the analysis of the large number of gene expression profiles and their interpretation. Analytical approaches will be developed that will substantially enhance the ability of transcriptional profiling to effectively uncover key genes underlying important phenotypes of interest across the biological and medical sciences.Read moreRead less
Does divergent natural selection drive the early stages of speciation? Australia is a megadiverse country containing more than one million species, including many endemic and endangered species. Nonetheless, human driven activities, including climate change and the introduction of invasive pests, threaten Australia's biodiversity and economic wealth. This project will test how species diversify in response to environmental differences and will provide resources to compliment efforts to better un ....Does divergent natural selection drive the early stages of speciation? Australia is a megadiverse country containing more than one million species, including many endemic and endangered species. Nonetheless, human driven activities, including climate change and the introduction of invasive pests, threaten Australia's biodiversity and economic wealth. This project will test how species diversify in response to environmental differences and will provide resources to compliment efforts to better understand the destructive effects of interbreeding between native and invasive plants. Information on the role of the environment on the origin of new species will help us manage Australia's unique biodiversity. This project will provide research training opportunities in ecology, genetics, and molecular biology.Read moreRead less
Speciation and the breakdown of coevolution during hybridisation. The preservation of Australia's biodiversity depends on understanding its origins and the mechanisms that prevent its disappearance. Interacting genes, such as those coding for the machinery of the cell, evolve together and can prevent the fusion of species during hybridisation. This occurs because the cellular machinery evolves independently in different species, leading to incompatible parts that fail in hybrids. This project wi ....Speciation and the breakdown of coevolution during hybridisation. The preservation of Australia's biodiversity depends on understanding its origins and the mechanisms that prevent its disappearance. Interacting genes, such as those coding for the machinery of the cell, evolve together and can prevent the fusion of species during hybridisation. This occurs because the cellular machinery evolves independently in different species, leading to incompatible parts that fail in hybrids. This project will investigate novel genetic mechanisms that lead to reduced hybrid survival and reproduction, and therefore to the preservation of species. Australian students will receive advanced training at the frontier where ecology, genetics, and molecular biology intersect.Read moreRead less
Beyond the gene: Linking herbivore behaviour to plant defense gene expression. This collaborative project investigates insect herbivore avoidance of plant defence mechanisms. Our project is novel because it integrates changes in the plant at a number of different levels and links them to insect foraging behaviour. Researchers assume that insects respond to plant defences by changing their foraging behaviour. This has not been tested directly. We use the genetically well characterised plant Arabi ....Beyond the gene: Linking herbivore behaviour to plant defense gene expression. This collaborative project investigates insect herbivore avoidance of plant defence mechanisms. Our project is novel because it integrates changes in the plant at a number of different levels and links them to insect foraging behaviour. Researchers assume that insects respond to plant defences by changing their foraging behaviour. This has not been tested directly. We use the genetically well characterised plant Arabidopsis and the world-wide pest Helicoverpa (heliothis) as a model system. Damage caused to crops by insect herbivores is a direct function of behaviour. Understanding this behaviour will lead to improved pest management and reduced economic losses.Read moreRead less