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Diversity maintenance in patchy environments. This project aims to advance understanding of species coexistence and diversity maintenance in complex natural environments. Though diversity varies across patchy natural and human-created environments, the mechanistic drivers of these patterns remain poorly understood. This knowledge gap limits our ability to predict and manage responses of natural communities to environmental changes. Using data from threatened Western Australian wildflower communi ....Diversity maintenance in patchy environments. This project aims to advance understanding of species coexistence and diversity maintenance in complex natural environments. Though diversity varies across patchy natural and human-created environments, the mechanistic drivers of these patterns remain poorly understood. This knowledge gap limits our ability to predict and manage responses of natural communities to environmental changes. Using data from threatened Western Australian wildflower communities and novel ecological models of species coexistence, the project aims to deliver a mechanistic understanding of biological diversity, and provide fundamental knowledge needed to improve ecosystem management and restoration outcomes across Australia and globally.Read moreRead less
The legacy of rainfall patterns in dryland ecosystems. This project aims to use an experimental approach to determine how rainfall regime structures dryland communities and ecosystem properties and potential responses to altered rainfall regime. Ecosystem functioning in drylands is governed by complex interactions between microbes, invertebrates and plants. Biological activity however is constrained by the availability of water and altered rainfall regimes that could moderate how organisms inter ....The legacy of rainfall patterns in dryland ecosystems. This project aims to use an experimental approach to determine how rainfall regime structures dryland communities and ecosystem properties and potential responses to altered rainfall regime. Ecosystem functioning in drylands is governed by complex interactions between microbes, invertebrates and plants. Biological activity however is constrained by the availability of water and altered rainfall regimes that could moderate how organisms interact, potentially causing trophic cascades and even ecosystem state changes. By linking observed responses with soil microbial functional attributes using newly developed molecular techniques the project seeks to provide a mechanistic insight into ecosystem responses to climate variability and extreme climatic events.Read moreRead less
Discovery Early Career Researcher Award - Grant ID: DE120100352
Funder
Australian Research Council
Funding Amount
$375,000.00
Summary
Understanding the origin and maintenance of megadiverse plant communities. South-western Australia hosts some of the most biologically diverse plant communities on Earth, and these occur on the most ancient, nutrient-impoverished soils. By studying coastal dunes of increasing age, this project will determine how megadiverse plant communities originate during long-term ecosystem development, and how they are maintained.
The role of plant-soil feedback in biodiversity maintenance along fertility gradients: from patterns to mechanisms. Plants strongly modify soils and their associated biota, which in turn has important consequences for plant growth. This is known as 'plant-soil feedback'. This project will determine whether such feedback plays a role in maintaining the exceptionally high levels of plant biodiversity found in the kwongan shrublands of south-western Australia.
From genes to ecosystems: does genetic divergence in eucalyptus alter biodiversity and ecosystem function? The project will use a dominant tree species of south-eastern Australia to examine how genetic based variation in its traits influences community organisation, biodiversity and ecosystem processes. Outcomes from this research will be important for responding to an uncertain future environment and maintaining the services ecosystems provide.
Ecological dynamics of parasite infections in reptiles. Australian ecosystems are threatened by new epidemics of diseases and parasites, some local, others from overseas. Examples include the facial tumours of Tasmanian devils and the fungus that threatens many native frog species. To manage these epidemics effectively, we must understand how they spread through animal populations. With better knowledge of how diseases of wildlife spread, we can develop more effective control of those diseases t ....Ecological dynamics of parasite infections in reptiles. Australian ecosystems are threatened by new epidemics of diseases and parasites, some local, others from overseas. Examples include the facial tumours of Tasmanian devils and the fungus that threatens many native frog species. To manage these epidemics effectively, we must understand how they spread through animal populations. With better knowledge of how diseases of wildlife spread, we can develop more effective control of those diseases thereby protecting wildlife species, animal populations and, ultimately, Australian ecology. This project will help to protect our fauna from invasive diseases and contribute to sustaining the biodiversity of the country. Read moreRead less
An ecophysiological analysis of key factors determining jarrah forest productivity on rehabilitated bauxite minesites. Following bauxite mining, soils are prepared for rehabilitation. After sowing or planting of the original species, a vegetation is established. Despite a successful first phase of rehabilitation, there is large variation between stands 5 to 10 years later. The aim of this project is to analyse the causes of this variation, especially variation in performance of jarrah (Eucalypt ....An ecophysiological analysis of key factors determining jarrah forest productivity on rehabilitated bauxite minesites. Following bauxite mining, soils are prepared for rehabilitation. After sowing or planting of the original species, a vegetation is established. Despite a successful first phase of rehabilitation, there is large variation between stands 5 to 10 years later. The aim of this project is to analyse the causes of this variation, especially variation in performance of jarrah (Eucalyptus marginata) between sites. Nutrient and water status of trees will be assessed, in a search for correlations with plant performance. Effects of fertilisation and irrigation on plant peformance will be investigated. The remarkably high phosphate-use efficiency of jarrah will also be analysed.Read moreRead less
Facultative sex-determination in a montane lizard. Why is the sex of some reptiles determined by their genetic constitution (sometimes involving heteromorphic sex chromosomes) whereas in other species the animal's sex is determined by the environment (especially, incubation temperature)? Multiple phylogenetic transitions between genetic sex determination (GSD) and environmental sex determination (ESD) suggest that these alternative modes of sex determination possess adaptive significance. Howe ....Facultative sex-determination in a montane lizard. Why is the sex of some reptiles determined by their genetic constitution (sometimes involving heteromorphic sex chromosomes) whereas in other species the animal's sex is determined by the environment (especially, incubation temperature)? Multiple phylogenetic transitions between genetic sex determination (GSD) and environmental sex determination (ESD) suggest that these alternative modes of sex determination possess adaptive significance. However, the selective forces favouring one versus the other remain obscure, despite sustained research in this field by many workers. The recent discovery of BOTH sex-determining systems simultaneously within a single population of alpine lizards provides a unique opportunity to test among competing hypotheses for the evolution of sex-determining systems. I propose an integrated study, in both the field and the laboratory, to clarify the mechanisms and the selective forces involved in the evolution of sex-determination.Read moreRead less
Evolutionary ecology of snakes and lizards. Although reptiles provide excellent "model systems" with which to examine evolutionary and ecological processes, most research in this field has been dominated by studies on other kinds of organisms. I propose a broad-ranging series of studies that will use a diverse array of lizard and snake species to erect and test novel hypotheses on the evolution of phenomena such as mating systems, sexual dimorphism, foraging biology, and reproductive investment ....Evolutionary ecology of snakes and lizards. Although reptiles provide excellent "model systems" with which to examine evolutionary and ecological processes, most research in this field has been dominated by studies on other kinds of organisms. I propose a broad-ranging series of studies that will use a diverse array of lizard and snake species to erect and test novel hypotheses on the evolution of phenomena such as mating systems, sexual dimorphism, foraging biology, and reproductive investment. My experimental studies will clarify the evolutionary role of phenotypic plasticity (that is, direct environmental effects) as well as genetic factors.Read moreRead less
Ecology and phylogeography of bird migration between Australia and New Guinea: paradise kingfishers as a model species. This project examines the evolutionary causes and ecological consequences of intra-tropical bird migration between north Australia and New Guinea, one of the major migration systems of the southern hemisphere. I will use the buff-breasted paradise kingfisher as a model species, exploiting two features of its biology (an aerodynamically costly tail and a breeding distribution wi ....Ecology and phylogeography of bird migration between Australia and New Guinea: paradise kingfishers as a model species. This project examines the evolutionary causes and ecological consequences of intra-tropical bird migration between north Australia and New Guinea, one of the major migration systems of the southern hemisphere. I will use the buff-breasted paradise kingfisher as a model species, exploiting two features of its biology (an aerodynamically costly tail and a breeding distribution with a large latitudinal range) to shed light on the costs, benefits, and ecological correlates of intra-tropical migration. Molecular markers will be used to identify non-breeding distributions, migratory patterns, and the biogeographic histories of the different breeding populations within Australia.Read moreRead less