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A new model for animal growth. This project aims to test and further develop a new theory for how animals grow. The new growth theory brings together the fields of physiology, ecology, and evolutionary biology, generating research publications, and training students. The proposed research is anticipated to provide a fundamentally new means for understanding how animals divide energy among growth and reproduction, paving the way for organismal allocation to these processes to be optimised by sele ....A new model for animal growth. This project aims to test and further develop a new theory for how animals grow. The new growth theory brings together the fields of physiology, ecology, and evolutionary biology, generating research publications, and training students. The proposed research is anticipated to provide a fundamentally new means for understanding how animals divide energy among growth and reproduction, paving the way for organismal allocation to these processes to be optimised by selective breeding or genetic manipulation, yielding potential benefits for aquaculture (enhanced growth) or re-introduction (enhanced reproduction).Read moreRead less
Scaling of structure, function and energetics of the vertebrate cardiovascular system. The hearts of mammals, reptiles and fish do different amounts of work, depending on the animal’s metabolic rate and body size. This project attempts to understand why hearts are the size and thickness that they are, and whether this results in minimising the work necessary to satisfy the requirements of the animal.
Calls and constraints: do male frogs signal direct benefits? There is international concern over recent declines and disappearances of many species of amphibians. Australia is a hotspot for declines, but causes of declines remain enigmatic. Approximately one quarter of Australia's 230 amphibian species breed in terrestrial situations, but processes such as salinity, wetland and urban developments and climate change are altering the hydrology of our landscape, and preventing the flood events nece ....Calls and constraints: do male frogs signal direct benefits? There is international concern over recent declines and disappearances of many species of amphibians. Australia is a hotspot for declines, but causes of declines remain enigmatic. Approximately one quarter of Australia's 230 amphibian species breed in terrestrial situations, but processes such as salinity, wetland and urban developments and climate change are altering the hydrology of our landscape, and preventing the flood events necessary for the completion of the lifecycle of many species. This research has important conservation implications because it examines the effects of variable moisture regimes on the physiology and reproductive behaviours of terrestrial breeding frogs.Read moreRead less
The physiological mechanisms underlying animal group dynamics. The project aims to provide novel insights into how individual differences in muscle biomechanics and metabolism constrain group assemblages, and the extent to which these constraints can cause fission and fusion of populations in changing environments. This research is significant because most ecological and evolutionary processes and their management occur at the level of groups. The project expects to yield a theoretical model cal ....The physiological mechanisms underlying animal group dynamics. The project aims to provide novel insights into how individual differences in muscle biomechanics and metabolism constrain group assemblages, and the extent to which these constraints can cause fission and fusion of populations in changing environments. This research is significant because most ecological and evolutionary processes and their management occur at the level of groups. The project expects to yield a theoretical model calibrated against empirical data to predict group dynamics of natural populations in changing environments, and of human crowds as diseases and lifestyle change physiological capacities.Read moreRead less
Environmental control of genetic/phenotypic interactions in lung development: An evolutionary perspective. Vertebrate lungs all contain morphologically and functionally similar lung lining cells. However, the cellular arrangement (i.e. lung morphology) and the function of the surfactant these cells produce, differs dramatically between species. Hence, a subset of highly conserved lung-specific genes coincides with spectacular phenotypic diversity. How has this diversity evolved? Do environmental ....Environmental control of genetic/phenotypic interactions in lung development: An evolutionary perspective. Vertebrate lungs all contain morphologically and functionally similar lung lining cells. However, the cellular arrangement (i.e. lung morphology) and the function of the surfactant these cells produce, differs dramatically between species. Hence, a subset of highly conserved lung-specific genes coincides with spectacular phenotypic diversity. How has this diversity evolved? Do environmental conditions, birth strategy or phylogenetic relationships determine lung phenotype? We will experimentally manipulate developing lungs and cells to demonstrate how environmental conditions (temperature, oxygen, lung-fluid regulation and neuro-hormonal input) promote evolutionary processes by altering gene expression, protein/lipid synthesis, cellular differentiation and hence lung morphology/function in animals with different birth strategies.Read moreRead less
Sensory integration in the whisker pathway: cortical transformations and the neuronal mechanisms that underlie decision confidence. How does the brain use information collected by sensory systems to make decisions? This study combines behavioural experiments with neuronal recording from various brain regions to understand the neuronal mechanisms that integrate sensory signals to generate representations and guide the appropriate behavioural action.
The importance of phenotypic plasticity in maintaining and introducing variation. This research is a synthesis of behaviour, natural and sexual selection, physiology, and natural and breeding ecology-important interactions that are rarely considered simultaneously in biology. It will contribute to our understanding of life-history decisions, and a long-neglected source of the variation that is the raw material for adaptation and for economically-important breeding programs . These results will h ....The importance of phenotypic plasticity in maintaining and introducing variation. This research is a synthesis of behaviour, natural and sexual selection, physiology, and natural and breeding ecology-important interactions that are rarely considered simultaneously in biology. It will contribute to our understanding of life-history decisions, and a long-neglected source of the variation that is the raw material for adaptation and for economically-important breeding programs . These results will have far-reaching implications for economically-important improvements to medicine, conservation, and crop and livestock production. This work will strengthen Australia's strong research profile in evolutionary genetics, physiology and ecology.Read moreRead less
Evolution of sound localisation in vertebrates: head size, sound frequency and neural phase-locking. Hearing is our most important sense for interpersonal communication, yet we have a fragmentary understanding of the basic mechanisms involved in normal hearing. This project addresses the question of how sound location is represented in the brain through the processing of minute time difference with which sounds reach the two ears. The outcome will ultimately enable us to infer how the human brai ....Evolution of sound localisation in vertebrates: head size, sound frequency and neural phase-locking. Hearing is our most important sense for interpersonal communication, yet we have a fragmentary understanding of the basic mechanisms involved in normal hearing. This project addresses the question of how sound location is represented in the brain through the processing of minute time difference with which sounds reach the two ears. The outcome will ultimately enable us to infer how the human brain localises sound, with practical applications for improved virtual auditory realities and hearing aids.Read moreRead less
Matching of gas exchanger structure and function with activity and environment in air-breathing fishes. This project will investigate the physiology and structure of Australian fishes that use gills and breathe air. It will measure the partitioning of oxygen and carbon dioxide exchange between the aquatic (gills) and aerial (lung, swim-bladder or mouth) respiratory organs, in relation to dissolved oxygen in the water and metabolic energy demands by the fish. Rates of gas exchange, biochemical ....Matching of gas exchanger structure and function with activity and environment in air-breathing fishes. This project will investigate the physiology and structure of Australian fishes that use gills and breathe air. It will measure the partitioning of oxygen and carbon dioxide exchange between the aquatic (gills) and aerial (lung, swim-bladder or mouth) respiratory organs, in relation to dissolved oxygen in the water and metabolic energy demands by the fish. Rates of gas exchange, biochemical characteristics of the blood, anatomy and physiology of the exchange organs, and respiratory/locomotory coupling will be measured in three selected species during graded exercise. The results will help us understand the factors influencing the evolution of air-breathing.Read moreRead less
Relaxin: molecular mechanisms of action in the reversal of fibrosis. Defects in relaxin and relaxin receptors are increasingly implicated as a cause of fibrosis which is associated with many disease processes. This study will examine the molecular mechanisms linking relaxin and fibrosis and will determine whether relaxin can be used to reverse the condition.