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Understanding and reversing the habitat shifts that have endangered the broad-headed snake. Extinction rates for vertebrate species are higher in southern Australia than almost anywhere else in the world, and saving endangered taxa is critical to biodiversity conservation. To do this effectively, researchers need to understand the processes that threaten wild populations, and to develop novel solutions to those problems in close collaboration with wildlife management authorities and other stake ....Understanding and reversing the habitat shifts that have endangered the broad-headed snake. Extinction rates for vertebrate species are higher in southern Australia than almost anywhere else in the world, and saving endangered taxa is critical to biodiversity conservation. To do this effectively, researchers need to understand the processes that threaten wild populations, and to develop novel solutions to those problems in close collaboration with wildlife management authorities and other stakeholders. This project will build such an understanding and collaboration, focusing on an endangered snake species. We propose ambitious landscape-scale field experiments that will simultaneously test hypotheses on threatening processes, and restore habitat quality to reverse population declines.Read moreRead less
Is recruitment of marine invertebrates affected by variation in larval quality? Managing marine populations and habitats requires detailed understanding of how populations are replenished, and why some places receive more new recruits than others. Attempts to reach this understanding have been hindered by the difficulty in studying tiny larvae that live in the plankton, and for most species, recruitment is a highly variable, unexplained phenomenon. We have identified a new explanation for this ....Is recruitment of marine invertebrates affected by variation in larval quality? Managing marine populations and habitats requires detailed understanding of how populations are replenished, and why some places receive more new recruits than others. Attempts to reach this understanding have been hindered by the difficulty in studying tiny larvae that live in the plankton, and for most species, recruitment is a highly variable, unexplained phenomenon. We have identified a new explanation for this variation, and will test this explanation using a marine invertebrate that is one of Australia's marine pests. A positive result offers promise of explaining recruitment variation in other species, and will provide insight into what makes this particular pest species successful.Read moreRead less
Nitrogen Removal in Wastewater Treatment Using the Nitrite Pathway. Nitrogen removal from our wastewater is becoming very important in most parts of Australia to protect our unique aquatic environment. This removal is achieved biologically through two steps: Nitrification converts ammonium via nitrite to nitrate; and denitrification converts nitrate via nitrite again to harmless nitrogen gas. This project aims to develop a method that allows this process to go just via nitrite, instead of nitrat ....Nitrogen Removal in Wastewater Treatment Using the Nitrite Pathway. Nitrogen removal from our wastewater is becoming very important in most parts of Australia to protect our unique aquatic environment. This removal is achieved biologically through two steps: Nitrification converts ammonium via nitrite to nitrate; and denitrification converts nitrate via nitrite again to harmless nitrogen gas. This project aims to develop a method that allows this process to go just via nitrite, instead of nitrate, to nitrogen gas. This would significantly reduce oxygen and/or carbon requirement in nitrogen removal. If successful, the new operating method will allow modern wastewater treatment plants to achieve a better effluent quality at lower costs.Read moreRead less
Sensory strategies for protecting endangered sawfishes. The Gulf of Carpentaria is the last habitat worldwide containing sustainable populations of sawfish. Easily entangled in nets, the saw has reduced population numbers dramatically in Australia with all species now protected under the Australian Environment Protection and Biodiversity Conservation Act, including the Convention on International Trade in Endangered Species (CITES). This study will provide basic biological information on feeding ....Sensory strategies for protecting endangered sawfishes. The Gulf of Carpentaria is the last habitat worldwide containing sustainable populations of sawfish. Easily entangled in nets, the saw has reduced population numbers dramatically in Australia with all species now protected under the Australian Environment Protection and Biodiversity Conservation Act, including the Convention on International Trade in Endangered Species (CITES). This study will provide basic biological information on feeding, prey manipulation and the role of critical senses in the only captive population of sawfishes in Australia. Such knowledge will underpin the development and use of visual, chemical and/or magnetic repellents by fisherman that are still responsible for the loss of large numbers of sawfish as by-catch.Read moreRead less
Testing indicators of genetic exchange and adaptation of populations, essential for biodiversity assessment and management. There will be diverse benefits from our testing and improvement of genetic indicators for exchange between populations and adaptive differentiation of populations. Managers and population biologists will have confidence in choice and use of these vital tools in sustainable use of our terrestrial and aquatic bioresources, as recommended by the federal State of Environment s ....Testing indicators of genetic exchange and adaptation of populations, essential for biodiversity assessment and management. There will be diverse benefits from our testing and improvement of genetic indicators for exchange between populations and adaptive differentiation of populations. Managers and population biologists will have confidence in choice and use of these vital tools in sustainable use of our terrestrial and aquatic bioresources, as recommended by the federal State of Environment system. Also, the use of these tools to identify differential genetic adaptations is the first step in bioprospecting, as well as revealing the raw material for natural and artificial populations to adapt to changes: soil loss, salinity, acidity, climate change. Forensic genetics will benefit from the improved tools for defining subpopulations.Read moreRead less
When corals bleach, what is the weakest photosynthetic link? Despite dire warning of the imminent impact (< 50 y) of climate change of coral reefs, we still do not understand the fundamental processes of coral bleaching. This project will enhance future management of Australia's extensive coral reef ecosystems by providing details on critical gaps in our knowledge. This will feed directly into several layers of management agencies for policy development and risk assessment. Managing our reefs in ....When corals bleach, what is the weakest photosynthetic link? Despite dire warning of the imminent impact (< 50 y) of climate change of coral reefs, we still do not understand the fundamental processes of coral bleaching. This project will enhance future management of Australia's extensive coral reef ecosystems by providing details on critical gaps in our knowledge. This will feed directly into several layers of management agencies for policy development and risk assessment. Managing our reefs in an ecologically sustainable manner is vital to the future economic, social and cultural prosperity of Australia. The economic importance of healthy and biodiverse coral reefs is pivotal to both the tourism and fisheries-based economies of Queensland ($2.4 b/y). Read moreRead less
Do costs of dispersal reduce connectivity in marine invertebrate populations? Current approaches to marine management - designing marine reserves, understanding pest incursions, and managing fisheries, acknowledge that marine animals exist in isolated local populations, connected by dispersal. Dispersal is crucial for local populations to persist or be managed sustainably, but our understanding remains poor and often limits our management. Most current approaches to estimating connectivity are ....Do costs of dispersal reduce connectivity in marine invertebrate populations? Current approaches to marine management - designing marine reserves, understanding pest incursions, and managing fisheries, acknowledge that marine animals exist in isolated local populations, connected by dispersal. Dispersal is crucial for local populations to persist or be managed sustainably, but our understanding remains poor and often limits our management. Most current approaches to estimating connectivity are adequate only if all dispersers are equally successful at establishing. Dispersal, however, is risky or costly, and we propose that these costs reduce the success of colonists from more distant populations. If this is correct, persistence of local populations may rely disproportionately on other nearby local populations.Read moreRead less
Post-settlement mortality as a filter for variable settlement in marine invertebrates. Most marine organisms have a planktonic dispersive stage. Recruitment from this stage into adult populations is a key process. Variations in recruitment affect our ability to manage fisheries, plan national parks, and predict environmental impacts. Our ability to understand variation in recruitment is limited by our poor understanding of one key component of recruitment, post-settlement mortality. I will t ....Post-settlement mortality as a filter for variable settlement in marine invertebrates. Most marine organisms have a planktonic dispersive stage. Recruitment from this stage into adult populations is a key process. Variations in recruitment affect our ability to manage fisheries, plan national parks, and predict environmental impacts. Our ability to understand variation in recruitment is limited by our poor understanding of one key component of recruitment, post-settlement mortality. I will take several common, economically important, marine invertebrates, and determine how strongly post-settlement mortality affects overall recruitment. By looking at several species, I will be able to identify general patterns applicable to a wider range of species.Read moreRead less
Metapopulation dynamics of coral communities on the Great Barrier Reef. Mathematical models for the dynamics of coral metapopulations on the Great Barrier Reef will be formulated and parameterised. Analysis of the models will focus on how the effects of competition between corals with different growth forms are influenced by other processes that generate spatial and temporal environmental variation. The project aims to understand how these factors influence the maintenance of high diversity in ....Metapopulation dynamics of coral communities on the Great Barrier Reef. Mathematical models for the dynamics of coral metapopulations on the Great Barrier Reef will be formulated and parameterised. Analysis of the models will focus on how the effects of competition between corals with different growth forms are influenced by other processes that generate spatial and temporal environmental variation. The project aims to understand how these factors influence the maintenance of high diversity in coral communities. It will also provide a modelling framework for predicting how that diversity will be affected by long-term environmental changes, making an important contribution to conservation and management of the Great Barrier Reef.Read moreRead less
Understanding marine biodiversity across vast spatial scales. Large-scale studies of biodiversity are frequently recommended by ecologists, but their costs are prohibitive. More efficient, yet accurate, sampling and analytical procedures are needed. This proposal will provide new quantitative knowledge on patterns of diversity of marine species (fish & invertebrates) from local to regional scales across southern Australia and northern New Zealand. An innovative feature of this research is the c ....Understanding marine biodiversity across vast spatial scales. Large-scale studies of biodiversity are frequently recommended by ecologists, but their costs are prohibitive. More efficient, yet accurate, sampling and analytical procedures are needed. This proposal will provide new quantitative knowledge on patterns of diversity of marine species (fish & invertebrates) from local to regional scales across southern Australia and northern New Zealand. An innovative feature of this research is the contribution of new ecological information with novel analytical procedures to identify the consequences of using more cost-effective techniques on quantifying patterns of biodiversity. This understanding is fundamental to the on-going advancement of ecology and conservation biology.Read moreRead less