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Deceptive signals in spiders. Animal communication involves a diversity of signals including visual displays, sounds and odours. Understanding the function of signals is difficult because humans cannot detect some signals such as UV light. This project investigates the functions of visual signals in two spider systems: the decorations in orb-webs and the colouration of crab spiders. We analyse whether these signals are cryptic or conspicuous. Do they attract prey or hide the spiders from predato ....Deceptive signals in spiders. Animal communication involves a diversity of signals including visual displays, sounds and odours. Understanding the function of signals is difficult because humans cannot detect some signals such as UV light. This project investigates the functions of visual signals in two spider systems: the decorations in orb-webs and the colouration of crab spiders. We analyse whether these signals are cryptic or conspicuous. Do they attract prey or hide the spiders from predators? Our project will make a significant contribution to understanding the evolution of these signals, and will, at least in part, help resolve century old debates surrounding their function.Read moreRead less
Discovery Early Career Researcher Award - Grant ID: DE180100026
Funder
Australian Research Council
Funding Amount
$365,058.00
Summary
Startle displays: a new route to resolving the aposematism paradox. This project aims to propose an empirical evaluation of startle displays as the ‘missing link’ in antipredator defences. The evolutionary origin of warning colouration is considered paradoxical in that conspicuous mutant prey should be attacked and killed as they evolve, denying predators any chance to learn to avoid them. Startle displays, however, are antipredator defences that exploit predator reflexes through a sudden transi ....Startle displays: a new route to resolving the aposematism paradox. This project aims to propose an empirical evaluation of startle displays as the ‘missing link’ in antipredator defences. The evolutionary origin of warning colouration is considered paradoxical in that conspicuous mutant prey should be attacked and killed as they evolve, denying predators any chance to learn to avoid them. Startle displays, however, are antipredator defences that exploit predator reflexes through a sudden transition from camouflage to warning colouration. This work merges theory on antipredator defences, deepens knowledge of their fitness costs and benefits, and provides a new resolution to a classic evolutionary paradox.Read moreRead less
More than mud: how will disruption of soft-sediments threaten coastal biodiversity? Habitat destruction and increased nutrient input are combining with climate change to threaten the biodiversity and fisheries productivity of soft sediment habitats that dominate Australia's sixteen million square kilometre exclusive economic zone. This project will develop the tools necessary for the sustainable management of our coastal biodiversity under multiple scenarios of change. Because many of the result ....More than mud: how will disruption of soft-sediments threaten coastal biodiversity? Habitat destruction and increased nutrient input are combining with climate change to threaten the biodiversity and fisheries productivity of soft sediment habitats that dominate Australia's sixteen million square kilometre exclusive economic zone. This project will develop the tools necessary for the sustainable management of our coastal biodiversity under multiple scenarios of change. Because many of the results will be broadly applicable to coastal systems worldwide, this project will generate high-impact publications that will increase the research profile of Australia. It will train postgraduate students in strategies to help ensure the sustainable use of our biodiversity and will generate collaborations with leading international scientists.Read moreRead less
Get tough, get toxic or get a bodyguard: how root herbivores shape grass defences. The weight of root-feeding beetles can exceed that of sheep on Australian pastures and can result in significant losses in productivity. Grasses fight back against aboveground herbivores using toughness (physical defence), toxicity (chemical defence) and bodyguards (recruitment of the herbivore’s enemies). Little is known about belowground defences however, but grasses depend on roots for re-growth so good root de ....Get tough, get toxic or get a bodyguard: how root herbivores shape grass defences. The weight of root-feeding beetles can exceed that of sheep on Australian pastures and can result in significant losses in productivity. Grasses fight back against aboveground herbivores using toughness (physical defence), toxicity (chemical defence) and bodyguards (recruitment of the herbivore’s enemies). Little is known about belowground defences however, but grasses depend on roots for re-growth so good root defences seem essential. This study will apply optimal defence theory to consider these three defences against belowground herbivory across a range of grasses. The project will ask whether domestication has disarmed grass species and if defensive traits differ between photosynthetic pathways, before field-testing these patterns with root herbivore populations. Read moreRead less
Do cleaner-fish control infections of parasitic protozoa transmitted by gnathiid isopods and leeches? We will study a popular example of mutualism, cleaning behaviour, from a different point of view: that cleaner-fish control the parasitic protozoa of the blood of client-fish by eating their vectors. This will provide information on the biological control of vector-borne parasites and develop mathematical models that will help us understand the epidemiology of vector-borne parasites in the sea. ....Do cleaner-fish control infections of parasitic protozoa transmitted by gnathiid isopods and leeches? We will study a popular example of mutualism, cleaning behaviour, from a different point of view: that cleaner-fish control the parasitic protozoa of the blood of client-fish by eating their vectors. This will provide information on the biological control of vector-borne parasites and develop mathematical models that will help us understand the epidemiology of vector-borne parasites in the sea. Our study will provide baseline data of a parasitic disease in a wild population, information useful for managing and monitoring the health of coral reefs. With the increased aquaculture of tropical fish species in Australia, this study will benefit the fish-farming industry by providing information on the biological control of fish parasites.Read moreRead less
Quantifying condition-dependence in sexual selection. This research centres on testing evolutionary models of sexual selection. The project has relevance for understanding the role of mutations in reducing the fitness of populations and hence has implications for the conservation of endangered species and for human health. The research also investigates how investment in one trait, such as horns, will take resources away from another, like muscle. This has implications for animal production. The ....Quantifying condition-dependence in sexual selection. This research centres on testing evolutionary models of sexual selection. The project has relevance for understanding the role of mutations in reducing the fitness of populations and hence has implications for the conservation of endangered species and for human health. The research also investigates how investment in one trait, such as horns, will take resources away from another, like muscle. This has implications for animal production. The project utilises pest species as research models and will hence provide further understanding of pest life-history, knowledge critical to the success of control programmes. Australian science will further benefit through the research fellow's established collaborations with international scientists.Read moreRead less
Molecular biosignatures for isolating pollution problems in aquatic ecosystems using macroinvertebrate bioindicators. Aquatic ecosystems are under increasing threat by human activities. This has been further exacerbated by drought and climate change. In the future, understanding the major factors impairing aquatic ecosystems will be a vital part of sustaining water resources. This project develops new molecular tools to better monitor and assess aquatic pollution. We will develop a new high-tech ....Molecular biosignatures for isolating pollution problems in aquatic ecosystems using macroinvertebrate bioindicators. Aquatic ecosystems are under increasing threat by human activities. This has been further exacerbated by drought and climate change. In the future, understanding the major factors impairing aquatic ecosystems will be a vital part of sustaining water resources. This project develops new molecular tools to better monitor and assess aquatic pollution. We will develop a new high-tech deoxyribonucleic acid (DNA) approach to identify insect indicator species and combine this with a field-based microcosm method that uses local aquatic insects to isolate pollution effects from other impacts. This proposal will facilitate fast identification of pollution problems and provide the water industry with an innovative means to assess pollution and monitor remedial actions.Read moreRead less
Discovery Early Career Researcher Award - Grant ID: DE140101281
Funder
Australian Research Council
Funding Amount
$384,589.00
Summary
Mechanisms influencing the evolutionary trajectories of extended phenotypes. Although we know how the environment and predator-prey interactions shape traits, we have a poor grasp of the evolution of extended phenotypes. The webs of spiders have switched repeatedly between two- and three-dimensional forms over time, so are excellent models for assessing extended phenotype evolution. This project will use innovative experiments to assess whether the prey capture performance of webs or their visib ....Mechanisms influencing the evolutionary trajectories of extended phenotypes. Although we know how the environment and predator-prey interactions shape traits, we have a poor grasp of the evolution of extended phenotypes. The webs of spiders have switched repeatedly between two- and three-dimensional forms over time, so are excellent models for assessing extended phenotype evolution. This project will use innovative experiments to assess whether the prey capture performance of webs or their visibility to insects drove the repeated This project will provide insights into the interactive roles of the environment and prey in shaping extended phenotype diversification. Read moreRead less
Ecology and conservation of a unique, threatened guanophilic invertebrate community. This project aims to study the biology and ecology of a unique assemblage of insects and other invertebrates that live specifically in bat guano at Naracoorte Caves World Heritage Area. The caves are a major ecotourism and research location because of their world famous Pliestocene fossils, and because one cave is a critical breeding site for the large bentwing bat, Miniopterus s. bassianii. The guano cave, whic ....Ecology and conservation of a unique, threatened guanophilic invertebrate community. This project aims to study the biology and ecology of a unique assemblage of insects and other invertebrates that live specifically in bat guano at Naracoorte Caves World Heritage Area. The caves are a major ecotourism and research location because of their world famous Pliestocene fossils, and because one cave is a critical breeding site for the large bentwing bat, Miniopterus s. bassianii. The guano cave, which contains numerous endemic invertebrates, is potentially threatened by both direct and indirect human impacts. The results of this research will form the basis of a long-term management strategy to conserve this diverse community.Read moreRead less
Big squids in Australian waters, insights into their biology, movement and activity, old questions - new technology. This project will assess important biological parameters of shelf and slope ommastrephid squids. Lab based studies will explore age, growth, maturity rates and diet for the deepwater squid Todarodes filippovae. Cutting -edge telemetry technology (manual tracking, listening curtains and satellite pop-up tags) will assess movement, activity, metabolism and vertical migration of bo ....Big squids in Australian waters, insights into their biology, movement and activity, old questions - new technology. This project will assess important biological parameters of shelf and slope ommastrephid squids. Lab based studies will explore age, growth, maturity rates and diet for the deepwater squid Todarodes filippovae. Cutting -edge telemetry technology (manual tracking, listening curtains and satellite pop-up tags) will assess movement, activity, metabolism and vertical migration of both T. filippovae in deep water and arrow squid (Nototodarus gouldi) on the shelf. A comprehensive understanding will be gained of the biology and lifestyle of these two key squid species that will be utilised by implementers of the South-east Regional Marine Plan, ecosystem modelers and resource managers.Read moreRead less