Why aren't all species everywhere? The evolution of species' borders in tropical reef fishes. Virtually nothing is known about how geographic range limits evolve in the wild in the absence of barriers to dispersal and habitat discontinuities. This project will investigate the evolution of range limits of fishes on the Great Barrier Reef using combinations of mathematical modelling and field- and laboratory-based analyses of evolutionary patterns and processes. By advancing understanding of the ....Why aren't all species everywhere? The evolution of species' borders in tropical reef fishes. Virtually nothing is known about how geographic range limits evolve in the wild in the absence of barriers to dispersal and habitat discontinuities. This project will investigate the evolution of range limits of fishes on the Great Barrier Reef using combinations of mathematical modelling and field- and laboratory-based analyses of evolutionary patterns and processes. By advancing understanding of the fundamental causes of species' range limits, this research will provide new options for the management and conservation of this very valuable resource, and other complex biological systems, under increasing pressures of exploitation, habitat degradation and climate change.Read moreRead less
The evolution of dispersal on range edges. The rate at which an invasive species spreads, and the ability of a native species to adapt to environmental change, are both contingent on the dispersal ability of the species. Dispersal ability, however, evolves rapidly on the edge of a species' range. The rapid evolution of dispersal, therefore, determines the eventual range-limits of invasive species, as well as of native species responding to changing conditions. This research will provide tools ....The evolution of dispersal on range edges. The rate at which an invasive species spreads, and the ability of a native species to adapt to environmental change, are both contingent on the dispersal ability of the species. Dispersal ability, however, evolves rapidly on the edge of a species' range. The rapid evolution of dispersal, therefore, determines the eventual range-limits of invasive species, as well as of native species responding to changing conditions. This research will provide tools with which to predict the direction and rate of dispersal evolution on range-edges. The results of this work will, thus, massively facilitate management of invasive species and climate change.Read moreRead less
Assessment of the diversity, distribution and uniqueness of subterranean animals from calcrete aquifers in central western Australia. Recently a rich and diverse subterranean invertebrate fauna (stygofauna) was unexpectedly discovered from numerous isolated calcrete aquifers associated with palaeodrainage channels in central Western Australia. Our recent taxonomic and molecular studies have suggested that stygofaunas within each aquifer may be highly endemic. We aim to test this hypothesis by in ....Assessment of the diversity, distribution and uniqueness of subterranean animals from calcrete aquifers in central western Australia. Recently a rich and diverse subterranean invertebrate fauna (stygofauna) was unexpectedly discovered from numerous isolated calcrete aquifers associated with palaeodrainage channels in central Western Australia. Our recent taxonomic and molecular studies have suggested that stygofaunas within each aquifer may be highly endemic. We aim to test this hypothesis by investigating the diversity, distribution and uniqueness of stygofauna from three major calcrete regions. We further aim to document the environmental conditions and variability within the aquifers and to develop rigorous sampling protocols. Such data are essential for the development of appropriate strategies for sustainable management of subterranean water and their ecosystems.Read moreRead less
Community and ecosystem consequences of adaptive evolution in Eucalyptus. There is emerging evidence across plant systems that genes in one species influence biodiversity and the services ecosystems provide, including soil fertility, carbon storage, and pollination. These results suggest that adaptive evolution in plants can lead to change in biodiversity and ecosystem function. If this finding proves to be true, results from this proposal might be critical to future decisions on the ecosystem ....Community and ecosystem consequences of adaptive evolution in Eucalyptus. There is emerging evidence across plant systems that genes in one species influence biodiversity and the services ecosystems provide, including soil fertility, carbon storage, and pollination. These results suggest that adaptive evolution in plants can lead to change in biodiversity and ecosystem function. If this finding proves to be true, results from this proposal might be critical to future decisions on the ecosystem consequences of landscape level selective events. There may be major implications for the rapidly expanding environmental and forestry plantings across Australia and temperate regions of the world where choice of seed source may have far reaching consequences.Read moreRead less
Inbreeding: what are the reproductive costs and how are they avoided? Inbreeding in animal populations will undoubtedly become more prevalent in the face of increased habitat fragmentation brought on by human activities and climate change. By increasing our understanding of how inbreeding influences reproductive traits, my research will be directly applicable to conservation programs, specifically by providing insights into how Australia's rich biodiversity will respond to climate change and var ....Inbreeding: what are the reproductive costs and how are they avoided? Inbreeding in animal populations will undoubtedly become more prevalent in the face of increased habitat fragmentation brought on by human activities and climate change. By increasing our understanding of how inbreeding influences reproductive traits, my research will be directly applicable to conservation programs, specifically by providing insights into how Australia's rich biodiversity will respond to climate change and variability. This project also addresses critical issues in evolutionary biology, thereby contributing towards Australia's reputation as a world leader in this field. Australian science will further benefit through international collaborations and from the training of young scientists.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
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
Analysing the roles of cospeciation and host-shifting in the evolution of behaviour and ecology of thrips associated with Australian Acacia. The relationships and interactions between phytophagous thrips and their host Acacia species provide a system well suited to investigating mechanisms of macroevolution in the Australian arid-zone biota. In this project we will determine the relative importance of mechanisms such as cospeciation and host-shifting within this model system, and examine the in ....Analysing the roles of cospeciation and host-shifting in the evolution of behaviour and ecology of thrips associated with Australian Acacia. The relationships and interactions between phytophagous thrips and their host Acacia species provide a system well suited to investigating mechanisms of macroevolution in the Australian arid-zone biota. In this project we will determine the relative importance of mechanisms such as cospeciation and host-shifting within this model system, and examine the influence of these mechanisms on the evolution of both the insects and the host-plants. It is expected that the results of this study will provide insights into the evolution of arid-zone biodiversity in Australia and the nature of insect/host-plant interactions.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
Host-parasite interactions during a biological invasion: toads, frogs and nematodes in tropical Australia. Cane toads were introduced to Australia 70 years ago, and are widely believed to cause major problems for native ecosystems. My work has identified another impact of cane toads: they have brought some of their native-range parasites with them from Central America, and at least one species (a lungworm) now attacks native Australian frogs. This project will explore the impact of the parasit ....Host-parasite interactions during a biological invasion: toads, frogs and nematodes in tropical Australia. Cane toads were introduced to Australia 70 years ago, and are widely believed to cause major problems for native ecosystems. My work has identified another impact of cane toads: they have brought some of their native-range parasites with them from Central America, and at least one species (a lungworm) now attacks native Australian frogs. This project will explore the impact of the parasite on native frogs as well as on the toads themselves, and determine why some (but not all) toad populations in Australia have escaped from these viability-reducing parasites. My work will clarify host-parasite coevolution, the ecological impact of invasive organisms, and the feasibility of using parasites to help control toads within Australia.Read moreRead less