UQ Theses Collection (RHD) - Open Access - UQ eSpace

Literature and cultural policy studies

Glover, Stuart — 2009-10-05T00:00:00Z

Living on the edge : along Tingalpa Creek. A history of Upper Tingalpa, Capalaba and Thorneside

Howells, Mary — 2009-10-28T00:00:00Z

Look before you leap : bringing futures thinking to a Queensland state high school : proposing futures thinking for the education system

O'Rourke, Bernadette P. — 2009-11-17T00:00:00Z

Loyalty and disloyalty : social and ideological conflict in Queensland during the Great War

Evans, Raymond — 2010-01-12T00:00:00Z

Managing employment status diversity in the Australian Defence Force: the critical role of group representation

Moffat, Kieren B. — 2012-10-03T00:00:00Z

Mapping the Edge: An analysis of regional responses in the Queensland house

Musgrave, Elizabeth A. — 2008-02-28T00:00:00Z

Market and non-market benefits in government-assisted reforestation in the Queensland wet tropics

Eono, Jean-Claude — 2011-09-13T00:00:00Z

Mathematical and computational methods for functional-structural plant modelling using L-systems and their applications to modelling the kiwifruit vine

Mikolaj Cieslak — 2011-01-28T00:00:00Z

Mathematical and computational modelling provides a framework within which the understanding of plant growth and development can be further advanced. By abstracting from reality, it provides a way to test our hypotheses of the behaviour of real plants, offers simple explanations of observed phenomenon, and allows us to make quantitative predictions under new conditions. In particular, functional-structural plant models are well suited for these types of studies, because they capture the complex interactions between plant architecture and physiological processes as governed by the environment. The aim of this research was to investigate and develop mathematical and computational methods for use in functional-structural plant modelling, and, in particular, to allow easy incorporation of various aspects of plant growth and development at different spatial and temporal scales into one complex dynamical system. To this end, a functional-structural kiwifruit vine model was constructed using an L-system based plant modelling platform. The model was used to integrate the kiwifruit vine's architectural development with mechanistic modelling of carbon transport and allocation. The branching pattern was captured at the individual shoot level by modelling axillary shoot development using a discrete-time Markov chain. An existing carbon transport-resistance model was extended to account for several source/sink components of individual plant elements. The model was then interfaced with the light simulation program QuasiMC, and used to estimate the absorbed irradiance of each leaf during the course of the vine's development. Furthermore, the operation of QuasiMC was illustrated and analysed using an abstract virtual canopy (a triangle mix) and the kiwifruit vine model as examples. Several simulations, inspired by biological experiments, were performed to illustrate the capabilities of the kiwifruit model, including the plastic response of shoot growth to local carbon supply, the branching patterns of two Actinidia species, the effect of carbon limitation and topological distance on fruit size, and the complex behaviour of sink competition for carbon. The model was able to represent the major features of kiwifruit growth and function, and provided a solid foundation for investigating plant modelling methodology. A major challenge in functional-structural plant modelling is the integration of several previously modelled aspects of plant function into one model. To meet this challenge, the kiwifruit model provided the inspiration for extending L-systems with a new modules of modules approach, which combines pseudo-L-systems with sets of productions and lists of modules to consider within those sets. Using the new approach, a model of a kiwifruit shoot was constructed that integrates previously modelled aspects of the shoot's architecture with carbon dynamics, apical dominance and biomechanics. In the short term, the kiwifruit model will be used to help explore the vine's physiology and genetic control. For example, it will help give a physiological interpretation of experimental results on competition for carbon between vegetative and reproductive components of the vine. In the long term, it will serve as the basis for development of decision support systems to help improve kiwifruit production.

Men and manliness on the frontier: Queensland and British Columbia in the mid-nineteenth century

Hogg, Robert Paul — 2008-11-21T00:00:00Z

Mending the web: Conflict transformation between Aboriginal and non-Indigenous Australians

Walker, Polly O. — 2010-02-15T00:00:00Z

Methods of Understanding and Designing For Mobile Communities

Axup, Jeffrey Charles — 2008-11-21T00:00:00Z

Society is increasingly on the move, mobile devices are commonly being used to coordinate group actions, and group communication features are rapidly being added to existing technologies. Despite this, little is known about how mobile groups act, or how communications technologies should be designed to augment existing behaviour. This is partially due to minimal research being done on the topic, but also to the lack of research methods available to study the topic with. Mobile groups are challenging to study because of frequent and long-duration movement, frequent distribution, and the rapidly changing environments they operate within. To address these issues, this research focuses on methodological issues surrounding the development of mobile devices for mobile groups and communities. More specifically it addresses backpackers, who are a relevant example of this type of community. The research primarily explores the convergence of computer supported cooperative work (CSCW) and the field of mobile device development. This enables the combination of emphasis on designing technologies for groups, social implications, mobile device design, and mobile settings. Major research outcomes presented in this thesis lie in three areas: 1) methods, 2) technology designs, and 3) backpacker culture. Five studies of backpacker behaviour and requirements form the core of the research. The methods used are in-situ and exploratory, and apply both novel and existing techniques to the domain of backpackers and mobile groups. Methods demonstrated in this research include: field trips for exploring mobile group behaviour and device usage, a social pairing exercise to explore social networks, contextual postcards to gain distributed feedback, and blog analysis which provides post-hoc diary data. Theoretical contributions include: observations on method triangulation, a taxonomy of mobility research, method templates to assist method usage, and identification of key categories leading to mobile group requirements. Design related outcomes include: 57 mobile tourism product ideas, a format for conveying product concepts, and a design for a wearable device to assist mobile researchers. Our understanding of backpacker culture has also improved as a consequence of the research. It has also generated user requirements to aid mobile development, methods of visualising mobile groups and communities, and a listing of relevant design tensions. Additionally, the research has added to our understanding of how new technologies such as blogs, SMS and iPods are being used by backpackers and how mobile groups naturally communicate.

Migration and masculinities: experiences of recent Chinese male migrants in Brisbane

Hibbins, Raymond Thomas — 2009-10-31T00:00:00Z

Minimising dilution in narrow vein mines

Stewart, Penelope Clair — 2007-08-24T00:00:00Z

Modelling diffraction in optical interconnects

Petrovic, Novak S. — 2008-11-21T00:00:00Z

Short-distance digital communication links, between chips on a circuit board, or between different circuit boards for example, have traditionally been built by using electrical interconnects -- metallic tracks and wires. Recent technological advances have resulted in improvements in the speed of information processing, but have left electrical interconnects intact, thus creating a serious communication problem. Free-space optical interconnects, made up of arrays of vertical-cavity surface-emitting lasers, microlenses, and photodetectors, could be used to solve this problem. If free-space optical interconnects are to successfully replace electrical interconnects, they have to be able to support large rates of information transfer with high channel densities. The biggest obstacle in the way of reaching these requirements is laser beam diffraction. There are three approaches commonly used to model the effects of laser beam diffraction in optical interconnects: one could pursue the path of solving the diffraction integral directly, one could apply stronger approximations with some loss of accuracy of the results, or one could cleverly reinterpret the diffraction problem altogether. None of the representatives of the three categories of existing solutions qualified for our purposes. The main contribution of this dissertation consist of, first, formulating the mode expansion method, and, second, showing that it outperforms all other methods previously used for modelling diffraction in optical interconnects. The mode expansion method allows us to obtain the optical field produced by the diffraction of arbitrary laser beams at empty apertures, phase-shifting optical elements, or any combinations thereof, regardless of the size, shape, position, or any other parameters either of the incident optical field or the observation plane. The mode expansion method enables us to perform all this without any reference or use of the traditional Huygens-Kirchhoff-Fresnel diffraction integrals. When using the mode expansion method, one replaces the incident optical field and the diffracting optical element by an effective beam, possibly containing higher-order transverse modes, so that the ultimate effects of diffraction are equivalently expressed through the complex-valued modal weights. By using the mode expansion method, one represents both the incident and the resultant optical fields in terms of an orthogonal set of functions, and finds the unknown parameters from the condition that the two fields have to be matched at each surface on their propagation paths. Even though essentially a numerical process, the mode expansion method can produce very accurate effective representations of the diffraction fields quickly and efficiently, usually by using no more than about a dozen expanding modes. The second tier of contributions contained in this dissertation is on the subject of the analysis and design of microchannel free-space optical interconnects. In addition to the proper characterisation of the design model, we have formulated several optical interconnect performance parameters, most notably the signal-to-noise ratio, optical carrier-to-noise ratio, and the space-bandwidth product, in a thorough and insightful way that has not been published previously. The proper calculation of those performance parameters, made possible by the mode expansion method, was then performed by using experimentally-measured fields of the incident vertical-cavity surface-emitting laser beams. After illustrating the importance of the proper way of modelling diffraction in optical interconnects, we have shown how to improve the optical interconnect performance by changing either the interconnect optical design, or by careful selection of the design parameter values. We have also suggested a change from the usual `square' to a novel `hexagonal' packing of the optical interconnect channels, in order to alleviate the negative diffraction effects. Finally, the optical interconnect tolerance to lateral misalignment, in the presence of multimodal incident laser beams was studied for the first time, and it was shown to be acceptable only as long as most of the incident optical power is emitted in the fundamental Gaussian mode.

Modelling studies in the Australian sugar industry

Wegener, Malcolm Keith — 2009-10-06T00:00:00Z

Monitoring and modelling threats to koala populations in rapidly urbanising landscapes: Koala coast, south east Queensland, Australia

Preece, Harriet Jane — 2008-11-21T00:00:00Z

Multi-User Signal and Spectra Coordination for Digital Subscriber Lines

Cendrillon, Raphael — 2005-01-31T00:00:00Z

The appetite amongst consumers for ever higher data-rates seems insatiable. This booming market presents a huge opportunity for telephone and cable operators. It also presents a challenge: the delivery of broadband services to millions of customers across sparsely populated areas. Fully fibre-based networks, whilst technically the most advanced solution, are prohibitively expensive to deploy. Digital subscriber lines (DSL) provide an alternative solution. Seen as a stepping-stone to a fully fibre-based network, DSL operates over telephone lines that are already in place, minimizing the cost of deployment. The basic principle behind DSL technology is to increase data-rate by widening the transmission bandwidth. Unfortunately, operating at high frequencies, in a medium originally designed for voice-band transmission, leads to crosstalk between the different DSLs. Crosstalk is typically 10-15 dB larger than the background noise and is the dominant source of performance degradation in DSL. This thesis develops practical multi-user techniques for mitigating crosstalk in DSL. The techniques proposed have low complexity, low latency, and are compatible with existing customer premises equipment (CPE). In addition to being practical, the techniques also yield near-optimal performance, operating close to the theoretical multi-user channel capacity. Multi-user techniques are based on the coordination of the different users in a network, and this can be done on either a spectral or signal level.

Native tree dieback in southern Queensland : its occurrence, severity and aetiology

Wylie, F. R. (Francis Ross) — 2009-12-15T00:00:00Z

Navigating CEO appointments: do Australia's top male and female CEOs differ in how they made it to the top?

Fitzsimmons, Terrance William — 2011-11-21T09:48:49Z

Near-real time financial assessment of the Queensland wool industry on a regional basis

Hall, Bradley Wayne — 2009-12-07T00:00:00Z

Nineteenth century railways: Federation and the constitutional conventions

Fletcher, Valerie — 2010-05-19T00:00:00Z

Non-Conventional Sintered Aluminium Powder Alloys

Sercombe, Timothy Barry — 2008-11-21T00:00:00Z

The aim of this thesis was to improve the properties of pressed and sintered aluminium powder alloys. This improvement was to be achieved using two methods. The first method involved the selection of an alloy system using binary aluminium phase diagrams and a knowledge of the phase diagram characteristics of ideal sintering systems. The second approach involved the judicious use of selected trace element additions to modify the sintering characteristics of aluminium and its alloys. A trace amount of magnesium was found to be critical to the sintering of aluminium powder due to its disrupting effect on the tenacious oxide layer covering the powder particles. The critical amount of Mg required to optimise both density and mechanical properties is dependent on the specific volume of oxide and the therefore particle size. The optimum concentration is 0.1-1.0wt% Mg. The Al-Sn phase diagram exhibits many of the characteristics of an ideal sintering system. Unsurprisingly, Sn was found to be an extremely efficient sintering aid, but only in the presence of Mg. Near full density parts were produced using an Al-8Sn-0.15Mg alloy in short sintering times (30 minutes). Additionally, as-sintered ductilities exceeding 20% were achieved using an Al-2Sn-0.15Mg alloy. Alloys based on the Al-Sn-Mg system lend themselves to sintering without compaction and therefore freeformed Al-Sn-Mg alloys have been produced and sintered to near full density from a starting density of ~50%. Trace amounts of Sn (Pb, In, Bi, or Sb) enhance the sintering response of an Al-4Cu-0.15Mg alloy via a vacancy binding mechanism. A similar mechanism suppresses natural ageing and stimulates artificial ageing when trace amounts of Sn are added to this alloy. A Sn-modified 2XXX series alloy has also been produced with mechanical properties nearly 20% above current commercial alloys. Along with the addition of 0.1wt%Sn, this improvement required an alteration to the solution treatment cycle which allowed the use of a higher sintering temperature without the formation of large amounts of boundary phase.

Nonlinear self-focusing and beam propagation using gaussian laguerre mode decomposition

Rodney Mcduff — 2009-12-08T00:00:00Z

This thesis descibes a theoretical study of nonlinear self-focusing as applied to the metrology of the nonlinear optical parameters of a medium. It also studies the phe- nomenon of optical power limiting which utilizes self-focusing e ects. As an analytical tool, a mode decomposition method which uses an orthogonal and complete set of Gaussian-Laguerre modes as a basis set is used to treat these problems. Nonlinear media both in the thin and thick limits are investigated. For thin media, a closed form expression is derived which describes the optical eld of an initally Gaussian beam that is perturbed by a thin nonlinear material which exhibits nonlinear absorption as well as nonlinear refraction. This result is valid for any regime of nonlinearity in the thin medium approximation. Thick media are treated using a numerical extension of the Gaussian-Laguerre Mode Decomposition technique. Spatial scanning techniques such as the Z-scan that rely on self-focusing e ects and that are used to measure the nonlinear optical parameters of a material are studied in detail. Optical limiting in both thick and thin media is also investigated.

Numerical simulation of a hot dry rock geothermal reservoir in the Cooper Basin, South Australia

Bronwyn Muller — 2009-04-02T00:00:00Z

This thesis describes the development and production of numerical simulations of the creation of a Hot Dry Rock (HDR) geothermal reservoir. This geothermal reservoir that was simulated is owned by Geodynamics Limited and is located in the Cooper Basin, South Australia. The simulations show the geometry of the geothermal reservoir and predict the productive lifespan of the reservoir. Geothermal energy, which is the thermal energy that is stored in the interior of the earth, is an enormous energy source and as such there is great interest in technology that allows this energy to be harnessed. The HDR process of extracting the geothermal energy from rock involves drilling a borehole to a suitable depth and injecting cold water into the rock via this well (known as the injection well) to create a reservoir by opening up fractures in the rock. As water is forced through the reservoir, heat is extracted from the rock via conduction and transferred to the water, creating an heat exchange. Warm water is brought to the surface via another well known as the extraction well. The heat from the water is used to generate electricity and then the water is fed back into the injection well, completing the cycle. The creation of a HDR geothermal reservoir comprises of many aspects: the injection of the fluid into the jointed rock system, the opening and shearing of the joints, the creation of the fluid reservoir in the rock and the temperature effects of the fluid flow through the joints. This work incorporates all of these aspects. Due to the multi-physics nature of this process multiple computational modelling strategies were implemented to allow for authentic simulation of the entire process. The mechanical rock behaviour was primarily simulated the Distinct Element Method. This two dimensional Distinct Element Method program allowed for a realistically scaled model of the whole geothermal reservoir to be developed. This model was particularly useful for modelling the joint behaviour as the discrete nature of this method compares well with the joint system on such a scale. A discrete particle based model was used to model the joint behaviour on a small scale. These models demonstrated the behaviour of joints under compressional strain, showing slip and the effects of joint dilatancy. The productive lifespan of the geothermal reservoir was modelled using a Finite Element Method program based on Darcy's Law and an height-averaged heat equation. The aim of this model was to simulate the effects on the rock temperature of the fluid flow through the reservoir. The lifespan of the reservoir with differing well geometries was tested using this model to show which geometry would extend the productive lifetime of the geothermal reservoir. The results produced from the DEM models showed that the reservoir geometry is very much dependent upon the joint angle, and under the Cooper Basin stress regime steeper joints will be more likely to open. Joint dilatancy also affects the fluid flow rates as the amount of joint opening is dependent upon the joint dilatancy angle. The modelling of the temperature drawdown of the rock due to the fluid flow showed that a square configuration of wells is the ideal configuration to prolong the productive lifespan of the HDR geothermal reservoir. Results produced with the modelling parameters provided by Geodynamics Limited indicate that the productive lifespan of the Cooper Basin HDR geothermal reservoir created is approximately 50 years. This reservoir is only one of many that can be created at the site to prolong the productivity of the energy plant. The combined results of this modelling strategy give an overall image of the creation and lifetime of the HDR geothermal energy plant in the Cooper Basin.

Of mice and minors: Developing a profile of children's mouse competence

Lane, Alison Elizabeth — 2009-12-15T00:00:00Z

Open return

Goor, Petra — 2009-10-07T00:00:00Z

Organising and representing women's interests : a case study of a nurses' union

Elder, Ruth — 2009-12-01T00:00:00Z

'Our wayward and backward sister colony': Queensland and the Australian federation movement, 1859-1901

McConnel, Katherine — 2008-11-21T00:00:00Z

Pain appraisals, coping and adjustment in daily-life with chronic pain: an ecological momentary assessment study

Chadwick, Benjamin J. — 2007-10-08T00:00:00Z

Parliamentary committees : an examination of the purpose and effectiveness of Committees of Enquiry of the Australian Commonwealth Parliament

Holzheimer, Raymond — 2010-04-28T00:00:00Z

Passive climate control for tourist facilities in the coastal tropics: (Far North Queensland)

Bromberek, Zbigniew — 2010-04-28T00:00:00Z

Patriarchy, capitalism and women's subordination in Britain and Australia : a comparative historical macrosociology with particular reference to 1850-1939

Kynaston, Chris — 2009-12-14T00:00:00Z

Patterns of industrial conflict under labour governments: A case study of Queensland Labor, 1915-1957

Blackwood, Simon John — 2009-10-15T00:00:00Z

Penalties and Sentences Act 1992 (Qld): A critical analysis of its principles and underlying rationales

Kilner, Ronald G. — 2009-11-18T00:00:00Z

Physical activity leisure-time participation of boys with developmental coordination disorder

Poulsen Anne A. (Anne Adele) — 2008-11-21T00:00:00Z

Physical education policy and practice in Queensland primary schools, 1970-1993

Walmsley, Howard Richard — 2009-12-09T00:00:00Z

Planning and federalism : with particular reference to Australia and Canada

Wiltshire, Kenneth W. — 2010-02-15T00:00:00Z

Plantation to small farm: A historical geography of the Lower Burdekin sugar industry, 1880-1930

Griggs, Peter D. — 2009-12-10T00:00:00Z

Playing Second Fiddle: A history of technology and organisation in the Australian music economy (1901-1990)

Rooney, David — 2004-03-30T00:00:00Z

This thesis is a socio-economic history of the relationship between music technology and organisational practices in twentieth-century Australia. It argues that the history of technology in the Australian music economy is dependent not only upon the changing technical characteristics of musical instruments and electronic consumer goods but also upon government policy-making, management practices in music technology manufacturing firms and patterns of music technology consumption. The thesis examines economic statistics regarding the import, export and local production of music technology in Australia. The economic statistics have not previously been examined in relation to the history of music technology in Australia. The historical analysis is structured according to a four-part periodisation which includes the Electric Age (1901-1930), the Electronic Age (1930-1950), the Transistor Age (1950-1970) and the Information Age (1970-1990). This periodisation enables the analysis to continually be refocussed as the key technological and socio-economic dynamics change. With this perspective, the history of the relationship between technology and organisation in the Australian music economy has been demonstrated to be dependent on a number of key technological changes. The thesis examines changes including the shift from acoustic to electric recording; the development of transistor-based consumer electronics goods; and the advent of digital information technology. However, a number of key social determinants, particularly organisational modes, are examined including changes from protectionist to more deregulated trade policy; lack of business skills in areas such as marketing, manufacturing technique and industrial research and development; and the development of a sense of popular modernity which is expressed in the consumption of new, technically advanced and glamorous music technology. In addition to the new perspectives on the history of music technology provided by the analysis of empirical economic data, this thesis contributes to the historiography of technology. The analytical framework it proposes locates music technology within what is described as an assemblage of technologies: technologies of production, technologies of sign systems, technologies of power and technologies of the self. This approach makes clear the interdependence of technological and social factors, and the inadequacy of narrow technological determinist and social constructivist accounts. The notion of an assemblage of technologies is further embellished by drawing upon key elements of recent theories of systems analysis: the seamless web, evolution and chaos theory. Through this analytical framework and the socio-economic analysis of the relationship between music technology and organisational practices, the thesis demonstrates that the history of technology cannot be understood unless it is seen as part of a complex and interacting technical, social, economic and institutional system.

Plays by women, subjects for nonproduction : the erasure of women playwrights

Sourile, Darlene. — 2012-05-08T00:00:00Z

Policies and practices in language teaching and information technology in south-east Queensland high schools

White, Peter B. — 2009-11-16T00:00:00Z

Policy and practice towards the education of isolated children : the case of North Queensland, 1919 to 1939

Higgins, Andrew H. — 2009-12-10T00:00:00Z

Policy implementation in government education systems

Dempster, Neil — 2009-12-14T00:00:00Z

Policy production and the Australian state : higher education entry in Queensland, March 1987-March 1996

Gale, Trevor — 2010-02-01T00:00:00Z

Political developments in the Commonwealth of Australia, 1919-1929

Curtis, Heather Joan — 2010-07-24T00:00:00Z

Population Ecology Of Crocodylus porosus (Schneider 1801) In The Kimberley Region Of Western Australia

Kay, Winston R — 2005-04-06T00:00:00Z

Crocodylus porosus is the most widely distributed crocodilian species and suffered widespread population decline during the 20th century, principally due to commercial hunting for their hides, but also from habitat destruction and persecution. An estimated 270,000 to 330,000 animals were killed in Australia before the species was protected in the early 1970s. Populations of C. porosus in Western Australia are poorly studied and the number of animals taken during the hunting era is unknown. However, by 1970, hunting was no longer considered to be commercially viable. Over the last two decades, adding commercial value to crocodiles through sustainable use has been an integral part of the management strategy throughout Australia. Despite this, demographic parameters remain unquantified for most life-history stages. This study attempts to provide quantified demographic information for some populations of C. porosus in Western Australia. Patterns of movement are a fundamental component to the dynamics of animal populations. VHF radio tags were attached to 16 estuarine crocodiles, which were tracked between October 2001 and May 2003. Male (n = 12) and female (n = 4) crocodiles exhibited distinctly different patterns of movement. Females occupied a small core linear range (1.3 +/- 0.9 km) on the main river channel during the dry season and moved distances of up to 62 km to nesting habitat during the wet season, returning to the same core area the following dry season. Males moved considerable distances along the Ord River throughout the year. The largest range recorded was 87 km for a 2.5 m juvenile male, which had not stabilized. However, male ranges did not appear to be related to body size, with the largest two ranges recorded for the smallest (2.5 m) and largest (4.3 m) males tagged. Rates of male movement did not differ significantly between three size classes of males but there were significant seasonal differences, with the highest mean rates of movement occurring during the summer wet season (4.0 +/- 5.4 km/d). The highest rate of sustained movement was 9.8 km/d for a translocated 2.6 m juvenile male, which travelled 118 km in 12 days to return to the area of its capture. Neither males nor females showed exclusive habitat preferences for any of four broad riverine habitats identified on the Ord River. Males had substantial range overlaps with no obvious spatial partitioning, suggesting territoriality is not an important behavioural characteristic of free-ranging male crocodiles along the Ord River. Rates of migration were also examined indirectly using genetic data, which integrates patterns of movement at the population level over many generations. One hundred and twenty three tissue samples were collected from three river systems between April 2001 and September 2002. Levels of genetic diversity and structure were quantified at nine microsatellite loci. Genetic data indicated that C. porosus shows strong site fidelity. However, indirect estimates of migration from fixation indices suggest gene flow is sufficient to maintain genetic diversity and population substructure but not so low as to cause inbreeding. Genetic diversity was similar in all three populations examined with allelic richness ranging from 4.6 to 5.0 alleles per locus and mean observed heterozygosity ranging from 0.63 to 0.74. Inbreeding coefficients indicated there was only moderate differentiation among the populations (FST = 0.08, RST = 0.06) but differences in allele frequencies were highly significant. Assignment tests designated 80% of individuals to their population of origin and identified only five individuals (4%) as first generation migrants. Populations that experience a severe and rapid reduction in size, such as occurred with C. porosus following the Second World War, are susceptible to losing a significant component of their genetic variation. There was compelling evidence for a recent genetic bottleneck in the three populations sampled. Survivorship in C. porosus in unknown for most life-history stages so a mark-recapture study was implemented to investigate the dynamics of the C. porosus population in the King River. A total of 162 animals were marked between June 2001 and July 2002 of which 75 marked animals were recaptured on 123 occasions. The size of the hatchling population (age < 1 year old) was estimated to be 91 +/- 2 (SE) in 2001, which was effectively an estimate of successful recruitment for the King River during that year. The size of the non-hatchling population (age > 1 year old) was estimated to be 69 +/- 13 but the precision of the estimate was low and should be treated cautiously. Survival of the 2001 cohort of hatchlings was high (> 95%) between June and December and did not vary between the sexes. Hatchlings grew rapidly from June 2001 to July 2002, doubling in length and showing a ten-fold increase in body mass. There were no significant differences in growth rates between females and males during the first 18 months of life. Crocodiles showed a significant behavioural response to capture, with capture probabilities decreasing over time for two groups classified by age. Furthermore, differences in capture probabilities between age groups were significant on all occasions. This has important implications for monitoring crocodile populations, particularly if sightability is influenced by human disturbance. This study has provided some insights into important ecological processes operating within Western Australian populations of C. porosus, but the number of populations examined and period of study were small for such a long-lived animal. More work is needed to determine whether the patterns that have emerged are typical throughout the species' range and longer term studies will be required to quantify vital statistics for most life stages.

Prawners, prawning and policies : the management of the Queensland prawn fishery 1970-1995

Glaister, J. P. (John Patrick) — 2009-11-16T00:00:00Z

Prehistoric Aboriginal settlement and subsistence in the Cooloola region, coastal southeast Queensland

McNiven, Ian J. — 2009-12-10T00:00:00Z

Prehistoric settlement patterns and artefact manufacture at Lawn Hill, Northwest Queensland

Hiscock, Peter — 2009-12-07T00:00:00Z

Preserving our natural heritage - timber

Cokley, Keith V. — 2010-05-26T00:00:00Z