Population fragmentation is a common symptom of the decline of species, including freshwater fishes. It occurs naturally, but has also proliferated in response to human interventions that increase the prevalence and intensity of isolating barriers and events. In regulated rivers, for example, fish are affected by the loss of connectivity between habitats that is associated with hydrological changes. The process has evolutionary consequences by limiting gene flow, reducing genetic diversity and rendering the isolates vulnerable to local environmental changes. Comparative studies of related species may help to elucidate the causes and consequences of fragmentation. For example, they may identify habitat features that influence the spatial separation of congeneric species. An opportunity for such a study arises with small fishes (Atherinidae) in the intensively-regulated River Murray, southeastern Australia. Whereas the unspecked hardyhead Craterocephalus stercusmuscarum fulvus is widespread and abundant, the Murray hardyhead C. fluviatilis has a patchy distribution and is listed as 'endangered‘ by the International Union for Conservation of Nature and 'vulnerable‘ under the Australian Environment Protection and Biodiversity Conservation Act 1999. These two species rarely cohabit, implying that they could be separated by particular habitat characteristics. In the past, several species of Craterocephalus, including C. fluviatilis and the Darling River hardyhead C. amniculus, have been regarded as C. eyresii sensu lato. The taxonomic separation of C. s. fulvus has been confirmed, but some doubt remains about the relationship of C. fluviatilis and C. amniculus. This issue needs resolution to ensure that appropriate targets are set for conservation. This study is a comparative investigation of the aforementioned species. It was designed (1) to identify the habitat characteristics that influence the distribution and abundance of C. fluviatilis and, given that salinity emerged as a key factor, (2) to explore the biological implications of salinity through a comparative study of osmoregulation in C. fluviatilis and C. s. fulvus, (3) to determine whether the osmoregulatory responses of population isolates of C. fluviatilis differ at varying salinities, and (4) to evaluate the genetic population structure of C. fluviatilis, confirm its taxonomic separation from C. amniculus and identify genetic 'management units‘ for conservation. Field sampling showed that C. fluviatilis is confined mainly to saline waters (0.4-20‰), whereas C. s. fulvus is absent from salinities >7‰. Comparisons were made of osmoregulation in these two taxa over a salinity range of 0.03-85‰, with additional reference to the small-mouth hardyhead Atherinosoma microstoma, a related estuarine species that tolerates salinities >94‰. The three species all are euryhaline, although the osmoregulatory ability of C. s. fulvus falters above about 35‰ salinity. C. fluviatilis is a better osmoregulator than A. microstoma at salinities <1‰, but both species tolerate hypersaline conditions (85‰). Osmoregulation was compared in C. fluviatilis from two isolated populations in different salinity regimes (Wyngate: 0.4-1.5‰, Disher Creek: c. 1.0-45‰) to determine whether they show related phenotypic differences. Fish from both populations remained healthy at salinities from 5-65‰. The Disher Creek population maintained a significantly lower blood osmotic concentration than the Wyngate population at salinities ≤1‰, suggesting that there is a physiological difference between them. The genetic population structure of C. fluviatilis and its taxonomic distinction from C. amniculus were investigated using complementary allozyme and mtDNA markers. This confirmed that C. fluviatilis is genetically distinct from its sister taxon, C. amniculus. It also identified several genetically-defined 'management units‘ as a framework for future conservation. Further, it revealed that C. fluviatilis in habitats downstream of Lock 1 on the Murray (274 km from the river mouth) displays a genetic signature indicating introgression with C. amniculus. Clearly, these findings have implications for the conservation of C. fluviatilis. For example, isolates can be prioritised for protection, and re-introduction programs can be modified accordingly. The findings may be applied to other freshwater fish, especially populations of closely-related species subject to salinisation or other stressors, and they may also contribute toward understanding of the factors and processes underlying rarity and fragmentation. It is clear that salinity can be a significant factor in population fragmentation, and that closelyrelated species with similar ranges may be segregated by differences in osmoregulatory ability. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1363300 / Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2009

Electrical imaging of groundwater that interacts with surface watercourses provides detail on the extent of intervention needed to accurately manage both resources. It is particularly important where one resource is saline or otherwise polluted, where spatial quantification of the interacting resources is critical to water use planning and where losses from surface waterways need to be minimized in order to transport water long distances. Geo-electric arrays or transient electromagnetic devices can be towed along watercourses to image electrical conductivity (EC) at multiple depths within and beneath those watercourses. It has been found that in such environments, EC is typically related primarily to groundwater salinity and secondarily to clay content. Submerged geo-electric arrays can detect detailed canal-bottom variations if correctly designed. Floating arrays pass obstacles easily and are good for surveying constricted rivers and canals. Transient electromagnetic devices detect saline features clearly but have inferior ability to detect fine changes just below beds of watercourses. All require that water depth be measured by sonar or pressure sensors for successful elimination of effects of the water layer on the data. The meandering paths of rivers and canals, combined with the sheer volume of data typically acquired in waterborne surveys, results in a geo-referencing dilemma that cannot be accommodated using either 2D imaging or 3D voxel imaging. Because of this, software was developed by the author which allows users to view vertical section images wrapped along meandering paths in 3D space so that they resemble ribbons. Geo-electric arrays suitable for simultaneous imaging of both shallow and deep strata need exponentially spread receiver electrodes and elongated transmitter electrodes. In order to design and facilitate such arrays, signed monopole notation for arrays with iv segmented elongated electrodes was developed. The new notation greatly simplified generalized geo-electric array equations and led to processing efficiency. It was used in the development of new array design software and automated inversion software including a new technique for stable inversion of datasets including data with values below noise level. The Allen Exponential Bipole (AXB) array configuration was defined as a collinear arrangement of 2 elongated transmitter electrodes followed by receiver electrodes spaced exponentially from the end of the second transmitter electrode. A method for constructing such geo-electric arrays for use in rivers and canals was developed and the resulting equipment was refined during the creation of an extensive set of EC imaging case studies distributed across canals and rivers of the Australian Murray- Darling Basin. Man made and natural variations in aquifers connected to those canals and rivers have been clearly and precisely identified in more than 1000 kilometres of EC imagery.

The PhD is concerned with the construction of site knowledge and how this is transformed into knowing where and how to intervene in a river system close to ecological collapse. It involves three overlapping topics: • Site knowledge and its impact upon the design process • Development of tools and techniques appropriate for working on a particular type of site condition: the threshold between land and water • Transitory: the impact of dynamic processes and events on inhabitation Site knowledge emerges from a process of investigating a location. It is generated by on-site and off-site operations. This involves the architect in a dynamic set of relationships - between encounters on the ground in the here and now, with more remote encounters with the site from the studio and archive. This mode of site study amplifies the impact of scale shift and it exposes the variable and provisional status of a location, while also providing a way of operating in environments that can be considered dynamic. The PhD is premised upon the need for a work to relate to its surrounding environment. The hinged meaning between the terms a site and to site have relevance to the design process. A site, as a noun, suggests a specific place, such as a plot of land, whereas the verb to site, suggests that a work will be placed in relation to other things. Site knowledge is thus generated through the act of describing a place, through the act of making drawings and other descriptions of that place. It generates ways of conceptualising a site and leads to action: knowing how and where to intervene in a location. The River Murray provided a context for the project work of the PhD. Research led to tools for recording (on site) and interpreting (off site) the impacts of flood events on the settlements on the riverbanks that were protected by levees that worked against the natural forces of the system. The research culminated in a range of designs that demonstrated how to integrate town and tourist developments into the re-established cyclical flows necessary for the health of the system.

Master of Visual Arts / This paper grows out of my ongoing practice of photographing the Darling River in western NSW. My interest in imaging the landscape and representing the contemporary divisions within it led me to investigate previous colonial conflicts, which occurred as white explorers in the 1830’s and squatters in the 1850’s took over the Aboriginal tribal lands on the Darling. In this paper I investigate the images created by explorers, artists and photographers, which were the beginnings of a Eurocentric vision for this land. These images were created in the context of a colonial history which forms the ideological backdrop to historical events and representations of this land. This research has involved me in an investigation across three different disciplines; Australian history, Australian visual art, and environmental aspects of human interactions with the land. The postcolonial histories which inform my work are themselves re-evaluations of earlier histories. This recent history has revealed, amid the images of European ‘settlement’ and ‘progress’, views of frontier violence and Aboriginal resistance to colonisation that were excluded from earlier histories. The fan-like shape of the Darling River, which for millennia has bought water to this dry land, is the motif that focuses my investigation. I discuss the relatively recent degradation of the river, which is the focus of contemporary conflicts between graziers, Aboriginal people, environmentalists and irrigators. Because large-scale irrigation now has the capacity to divert the flows of entire rivers for the irrigation of cash crops, the insecurities of earlier generations over the ‘unpredictable’ floods and their perception of lack of control over water - has been entirely reversed. ‘Control’ of water is now held by irrigators and the river down stream from the pumps is kept at a constant low, becoming a chain of stagnant waterholes during summer. Like many rivers in industrialised countries, the Darling no longer flows to its ocean. The physical characteristics of rangeland grazing are an important background to my paper. Although the introduction of sheep and cattle has altered and degraded this landscape, unlike ploughed country to the east this land retains much of its native vegetation and an Aboriginal history embedded across its surface. This paper is an investigation of the changing representations of the Australian landscape, and central to my paper (and a result of growing up in this area) is my recognition, at an early age, of cultural difference in the context of this landscape. I became aware of contradictions in how Aboriginal people were treated by the ‘white’ community and I glimpsed the distinct cultural viewpoints held by Aboriginal people. A connection to country continues to be expressed in art produced by Aboriginal people in the Wilcannia area, including work by Badger Bates and Waddy Harris. The Wilcannia Mob, a schoolboy rap-group received national press coverage, winning a Deadly Award in 2002 for their acclaimed song ‘Down River’. While a discussion of these artworks is not part of the discussion of my paper, it is a context for my research. In broad terms this paper is an investigation of different worldviews, different views of land and landscape by graziers, Aboriginal people, environmentalists and irrigators. These views carry with them different cultural understandings and different representations of the land - different and sometimes opposing views of its past and its future. It seems in 2005 that, just as artists, historians, filmmakers, etc. are beginning to come to terms with Australian colonial history, as the El Nino seasons and the importance of ‘environmental flows’ in the Murray Darling Basin are increasingly understood, that technological changes and the global effects of population densities are creating other changes (greenhouse gasses, ozone depletion, climate changes) that once again appear to be unpredictable and beyond our control. While this environmental discussion is outside the scope of the current paper it is a context for my investigation of this landscape.

Thesis (MA)--University of Stellenbosch, 2002. / ENGLISH ABSTRACT: Recently, Participatory action research (PAR) has become a common approach to social programmes in South Africa. This tendency has created a need to evaluate this kind of programmes to determine if it really achieves what it sets out to do. The purpose of this study was to evaluate an entrepreneurial skills training programme in a rural community where a participatory action research approach was followed. A literature review was undertaken to present an in-depth look into the body of literature that surrounds the study. Programme evaluation was discussed as a research design, including types and stages of evaluation. The concept of empowerment was investigated. The review also included a study of literature on PAR, especially the definitions, context and process of PAR. The role of entrepreneurship in rural development was also investigated as well as the evaluation of entrepreneurial skills training programmes. An entrepreneurial skills training programme was implemented in the rural town of Darling on the West Coast of South Africa. The PAR approach was followed in the implementation of the study that was conducted over a period of 15 months. Participants joined the programme that included different projects, voluntarily. The participants were divided into three groups according to their period of participation in the programme. The researcher facilitated actions as well as reflection meetings with the group of participants before and after the entrepreneurial skills training course. The researcher made field notes during the implementation of the programme. The participants' empowerment status was measured with a standardized questionnaire using a pre-test-post-test design. The participants' application of the entrepreneurial skills that were taught in the course was measured during semi-structured interviews at the end of the research perico. four case studies document the extremes of the respective outcomes of the programme, namely empowerment and entrepreneurship. Statistical analysis showed statistically significant improvements in the micro, macro and total empowerment scores of the total group. Looking at the three groups separately, group one showed statistically significant improvements on the micro and interface levels and group two on the micro level. Even though group three showed small improvements on all three levels, none of them were statistically significant. Data from the field notes wer:e analyzed according to the PAR concepts of participation, action and reflection. Participation mostly had a collaborative nature; action was aimed at economical change and reflection aimed at practical problem solving. The interviews revealed that 20 of the 24 participants had micro baking businesses at the end of the research period and they succeeded in the short-term goal of applying the skills that were taught in the course. The case studies showed no correlation between the participants' application of entrepreneurial skills and the changes in their empowerment status. The findings of the study suggest that the longer participants participate in a PAR programme, the bigger the improvement in their empowerment status will be. Monitoring of the implementation revealed that the study fell short of the "ideal type" of PAR, since participation was not yet collegiate. Actions were only effective in economic change and not in social transformation. Reflection resulted in limited critical self-awareness among the participants. The PAR approach has proven to be successful in the attainment of the short-term goals of an entrepreneurial skills training programme. The long-term sustainability of the entrepreneurs' businesses will have to be followed-up by further research. / AFRIKAANSE OPSOMMING: Die afgelope tyd is deelnemende aksie navorsing (DAN)'n algemene benadering tot sosiale intervensie programme in Suid-Afrika. Hierdie tendens het 'n behoefte laat ontstaan om hierdie tipe programme te evalueer om te bepaal of dit werklik die program doelwitte bereik. Die doel van hierdie studie was om 'n entrepreneursvaardighede opleidingsprogram in 'n landelike gemeenskap waar die DAN-benadering gevolg is, te evalueer. 'n Literatuuroorsig is onderneem om die konseptueie raamwerk wat vir die studie saamgestel is, te kan beredeneer. Programevaluering, insluitende tipes and stadia van evaluering, is bespreek as 'n navorsingsontwerp. Die konsep van bemagtiging is ook bestudeer. Die oorsig het 'n ook studie van literatuur oor DAN ingesluit, veral definisies, die konteks en die proses van DAN. Die rol van entrepreneurskap in landelike ontwikkeling is 00~ ondersoek sowel as die evaluering van opleidingsprogramme gemik op die ontwikkeling van entrepreneursvaardighede. 'n Entrepreneursvaardighede opleidingsprogram is in 'n landelike dorpie, Darling, aan die Weskus van Suid-Afrika geïmplementeer. Oor 'n periode van 15 maande is die DAN-benadering in die implementering van die program gevolg. Deelnemers het vrywillig by die program wat uit verskillende projekte bestaan het, aangesluit. Die deelnemers is na aanleiding van hul tydperk van deelname in die program in drie groepe verdeel. Die navorser het aksies sowel as refleksie byeenkomste met die groep deelnemers voor en na die entrepreneursvaardighede opleidingskursus gefasiliteer. Die navorser het veldnotas tydens die implementering van die program gemaak. Die deelnemers se bemagtigingstatus is gemeet met 'n gestandaardiseerde vraelys terwyl 'n voor-en-na-toets ontwerp gevolg is. Die deelnemers se toepassing van die entrepreneursvaardighede wat in die kursus geleer is, is tydens semigestruktureerde onderhoude aan die einde van die navorsingsperiode gemeet. Vier gevallestudies dokumenteer die uiterstes van die onderskeidelike uitkomste van die program, naamlik bemagtiging en entrepreneurskap. Statistiese analise het statisties betekenisvolle verbeteringe in die mikro, makro en totale bemagtigingsvlakke van die totale groep getoon. Afsonderlik gesien, het groep een statisties betekenisvolle verbeteringe op die mikro en tussenvlak getoon en groep twee net op die mikrovlak. Alhoewel groep drie klein verbeteringe op al drie vlakke getoon het, was geen van die verbeteringe statisties betekenisvol nie. Data van die veldnotas is volgens DAN konsepte, naamlik deelname, aksie en refleksie geanaliseer. Die deelnemers en die fasiliteerder se deelname het meestal In samewerkende aard gehad, aksie was gemik op ekonomiese verandering en refleksie was gemik op praktiese probleemoplossinq. Die onderhoude het aangetoon dat 20 van die 24 deelnemers aan die einde van die navorsingsperiode In mikro bakbesigheid gehad het en dat hulle daarin geslaag het om die korttermyn doelwit, naamlik die toepassing van die vaardighede wat in die kursus geleer is, te bereik. Die gevallestudies het geen korrelasie getoon tussen die deelnemers se toepassing van entrepreneursvaardighede en die veranderinge in hulle bemagtigingstatus nie. Die studie se bevindinge dui daarop dat hoe langer deelnemers aan In DAN-program deelneem, hoe groter sal die verbetering in hulle bemagtigingstatus wees. Die monitering van die implementering van die program het laat biyk dat die studie tekort skiet in vergelyking met die "ideaaltipe" van DAN, want die deelname was nog nie korporatief nie. Aksies was net suksesvol in ekonomiese verandering en nie in sosiale transformasie nie. Refleksie het tot beperkte kritiese "selfbewustheid" by die deelnemers gelei. Dit blyk dat die DAN-benadering suksesvol was om die korttermyn doelwitte van In entrepreneursvaardighede opleidingsprogram te bereik. Die langtermyn volhoubaarheid van die entrepreneurs se bakbesighede sal met verdere navorsing opgevolg moet word.

No description available.

No description available.

This thesis is the study of a single farm, Klaver Valley in the Darling district, 1812 - 1898. Chapter One provides a physical view of Klaver Valley from 1812 to 1898 showing the changes in the landscape and production of grains, wine and wool over the period. It argues that these changes occurred as a direct result of external market forces. Chapter Two focuses on the changes which occurred in the labour process from the early 1800s to 1898, arguing that the main impetus for change came from mechanisation of harvesting in the 1820s and 1850s. Chapter Three explores the notion of a capitalist farmer and argues that Duckitt and later Ruperti can be categorised as capitalist farmers. The main thrust of their progressive capitalization occurred before the 1850s and it did so as a result of the system of informal credit which existed at farm level among farmers, allowing for re-investment and survival of cash flow. Chapter Four studies the process of proletarianisation which accompanied the capitalist development of the farm and its farmers. While taking account of the existence of a small number (3) of sharecroppers on the farm in the 1840s, 1870s and 1890s, this chapter argues that by the early 1830s, the farm was operating on the back of fully proletarianised labour. Composition of the labour force, wages and tasks, the work of women and the change from resident and permanent to casual labour from the 1820s to the 1890s, form some of the main focuses of this chapter. Chapter Five explores the nature of the relationship between the farmer and workers from 1829 - 1898, the two increasingly alienated from each other by the encroachment of the overseer. It argues that capitalist relations of production developed in the context of paternalism throughout although it was increasingly shaped by the cash-oriented relationship.

Abstract not available

[Truncated abstract] The assessment of rehabilitation success is time consuming and costly for bauxite miners because large areas of land (~550 ha per year) are involved. In some cases, rehabilitation results in patches of bare or sparsely vegetated soil. This study uses remote sensing imagery to evaluate the growth of vegetation in rehabilitated bauxite mines in the Darling Range, W.A. This work has five aims, which are to (1) compare vegetation biomass within rehabilitated areas and nearby native forest; (2) analyse temporal changes in vegetation growth within the selected rehabilitated areas, in particular rehabilitated areas with patches of bare soil; (3) compare vegetation growth pre- and post- mining; (4) identify the best type of remotely sensed data for this particular study area, and (5) develop an index, which can classify the degree of vegetation patchiness within rehabilitated mine sites. This information will enable rehabilitation workers to identify patches in rehabilitated areas that may require further remediation. The study used RADARSAT, nine years of Normalised Difference Vegetation Index (NDVI) maps (extracted from LANDSAT TM multivariate imagery and Quickbird imagery) and aerial photographs to evaluate forty-seven ~1 ha study sites. Image and map analyses were conducted mainly using ESRI’s software ArcGIS 8.3 and ER Mapper 6.4. Ground truthing was carried out to confirm and recognise the causes of bare patches within the rehabilitated mine sites ... The results indicate that differences in rehabilitation management do not affect this index but the extent of bare patches does. Due to the sensitivity of radar imagery to surface roughness, rehabilitated areas cannot be distinguished from the native forest using radar images. A building (crusher) appears to be the same as mature vegetation. Knowledge of the features in an area is therefore crucial when utilising RADARSAT. The beam elevation angle and profile of the RADARSAT image used, made superimposition of radar and optical imageries impossible. Speckle noise in RADARSAT images made it impossible to detect relatively small bare patches. In addition, the many cloud free days in Western Australia make optical imaging possible so that the ability of radar imagery to penetrate cloud is redundant for this type of study.