Letteratura scientifica selezionata sul tema "Ranges (S. Aust.)"

In April 2004, there was a serious outbreak of a tomato (Lypersicon esculentum Mill.) leaf spot disease in Mgeta, Mvomero District of Tanzania. The disease was characterized by lesions on green tomato fruits that were small, sunken, and black and were surrounded by darker green haloes. Lesions on ripe tomato fruits were dark brown to black, superficial, and measured approximately 1 to 2 mm in diameter. On the leaves, lesions were small, black, and surrounded by chlorotic (yellow) haloes. In some cases, the specks coalesced to form large lesions on older leaves. Black lesions were also observed on stems and petioles. A disease survey of selected tomato-producing areas in Arusha, Dodoma, Iringa, and Morogoro regions of Tanzania during 2004 and 2005 revealed that the disease was widespread in farmers' fields in all areas surveyed. Disease incidence was approximately 80%, while severity, rated on the scale of Chambers and Merriman (1), ranged from moderate (11 to 40 lesions per plant) to severe (>40 lesions per plant). A bacterium that produced a greenish, diffusible pigment on King's medium B was consistently isolated from lesions on tomato fruits collected from the fields in all the surveyed areas. All 56 isolates obtained were gram negative, oxidase negative, and fluoresced on King's medium B under UV light. None utilized phenylethylamine as the sole carbon source, while three isolates utilized i-erythritol and lactulose. Biolog analysis of the isolates, along with two reference strains of P. syringae pv. tomato (Pst CEP-3 from Sokoine University of Agriculture, Tanzania and Pst BB6 [Race 1] from Göttinger Sammlung Phytopathogener Bakterien, Göttingen, Germany) identified them as P. syringae pv. tomato, with similarity indices of 0.518 to 0.933. They also were positively identified as P. syringae pv. tomato by repetitive sequence-based-PCR (2,3) and fragment length polymorphism analysis. Pathogenicity of the strains was confirmed by spraying 35-day-old tomato seedlings (cv. Tanya) with suspensions of the isolates at a concentration of 108 CFU ml-1 of sterile water. After approximately 72 h, small, water-soaked, dark brown lesions similar to those observed on the field plants were observed on leaves of all the inoculated tomato seedlings. There were no symptoms on control plants. The bacterium was reisolated from the infected plants and identified as P. syringae pv. tomato, in accordance with Koch's postulates. To our knowledge, this is the first report of the occurrence of tomato bacterial speck in Tanzania. References: (1). S. C. Chambers and P. R. Merriman. Aust. J. Agric. Res. 26:657, 1975. (2). F. J. Louws et al. Appl. Environ. Microbiol. 60:2286, 1994. (3). M. Zaccardelli et al. Eur. J. Plant Pathol. 111:85, 2005.

of the paper highlights his willingness to contribute his experience freely to the discussion of issues confronting rangeland managers: "In this paper I hope to lead you through the financial history of Willangee Station. Through decisions we made, the mistakes we have made, the lessions we have learnt, the debts we have taken on and the profits we have made. Our aim is to expose all of these factsso people may learn from them'. The paper, along with others presented at the Seminar, was published in the Australian Rangeland Journal. In 1980 Bill hosted a tour of Willangee by the Barrier Environment Group during a Conference on the theme'% the West Darling becoming a Desert?" By his actions, conservationists and graziers were brought together duringa period when conservation of Australia's arid lands was becoming a major issue. Through his leadership of the Broken Hill Branch of the Australian Rangeland Society, Bill has contributed greatly to the exchange of ideas between academics, the pastoralist community and conservationists. With such a wealth of knowledge of the district and its people Bill has been aguiding influence to the Broken Hill Branch, the Committee and its members. Aust. Rangel. J. 7(2) 1985, 64- 74 THE CASE FOR PRESCRIBED BURNING TO CONTROL SHRUBS IN EASTERN SEMI-ARID WOODLANDS K.C. Hodgkinson and G.N. Harrington CSIRO Division of Wildlife and Rangelands Research, Private Bag, P.O., Deniliquin, N.S. W. 2710 Abstract A theor) for shrub control by prescnbed burn~ng In semi-and woodlands of eastern Australla IS outlmed. Th~s theory IS based on ~nev~table shrub Increases wh~ch occur pnnc~pally by ep~sod~c, w~despread, mass establ~shment events Wet per~ods whlch foster shrub establ~shment also promote abundant grass growth pred~sposlng the plant community to be~ng burnt Fue then k~lls nearly all recently establ~shed shrubs and many of theadult shrubs, thereby con- trollmg the shrub populat~on Today, fire IS much less frequent and IS prevented altogether In some areas. Prescr~bed burn~ng before any potential wddflre season w~ll both control shrubs and hm~t the spread of wddfires Three constraints to the adopt~on of prescrtbed burn~ng are recogn~sed economlc benefits are ma~nly real~sed over a 10-20 year term: * grazlers have l~ttle experience and Infrequent opportunltles to learn about fire; grazlers are reluctant to accept the nsks associated with burnmg. If semi-and woodlands are to be burnt at a frequency necessary for shrub control. grazlng pressures may need to be reduced to husband the vlgour of perenn~al pasture plants Opponun~st~c burnlng should take place at times of w~despread shrub seedl~ngestabl~shment. Prescribed burnlng IS the only known method for broad-scale shrub control and relevant State departments and grazlers are urged to collaborate In prescr~bed burn~ng to a regonal strategy. rather than property by property

In the spring of 2006, canola (Brassica napus L.) plants suffering from wilt were observed in an experimental plot at Merredin, Western Australia. Symptoms on the affected plants were tan-brown, longitudinal streaks along the main stem and on some lateral branches. Lesions on the stem were predominantly unilateral but sometimes covered the entire stem. Some of the lateral branches were completely wilted, and if present, pods were either shriveled or contained small seed. At the base of the stem, the lesions were grayish brown streaks that caused longitudinal splitting of the stem base. Small spherical (55 to 75 μm in diameter) and elongated (75 to 120 μm long) microsclerotia were seen in the pith and vascular region. Roots appeared to be symptomless, but upon removing the epidermis, grayish streaks were also seen on the roots and small sclerotia were observed in the pith and the vascular region of roots. One hundred and four small pieces (1 to 2 cm) of stem and root from 10 symptomatic plants were surface sterilized with 1.25% NaOCl, rinsed twice in sterile distilled water, and plated on potato dextrose agar (PDA) supplemented with 10 ppm of aureomycin. These were incubated under a blacklight at 22°C. Macrophomina phaseolina (Tassi) Goid. was isolated from 80% of the pieces as identified by colony morphology and the size of microsclerotia that ranged between 50 and 190 μm (3). Eight-three isolates were obtained. None of the isolates produced pycnidia on PDA. However, pycnidia (100 to 190 μm) with pycnidiospores (17.5 to 30 × 7.5 to 10 μm) were produced on the affected stems collected from the field. Pathogenicity tests with one of the isolates were conducted on seven 2-week-old canola plants (cv. Stubby). Three uninoculated plants served as the control. Roots of 2-week-old plants were dipped in an aqueous conidial suspension (1 × 104 conidia/ml) of M. phaseolina for an hour while roots of control plants were dipped in sterile water. Inoculated and control plants were repotted in separate pots and transferred to a glasshouse. A week after inoculation, M. phaseolina produced chlorosis of the leaves, and subsequently, complete wilting and death of the inoculated plants. M. phaseolina was successfully reisolated from roots and stems of symptomatic plants. No symptoms developed on the control plants. Pathogenicity was also tested by soaking seeds of cv. Stubby with an aqueous conidial suspension of M. phaseolina for one-half hour and incubating on agar media after drying. Germinating seeds were colonized by the growing mycelium and seedlings were completely killed within a week. Abundant microsclerotia were produced on the dead seedlings. M. phaseolina has been previously reported on canola in the United States (1) and Argentina (2) and more recently has been reported on canola in eastern Australia (4). To our knowledge, this is the first record of occurrence of M. phaseolina on canola in Western Australia and its impact on canola yield needs to be determined. References: (1) R. E. Baird et al. Plant Dis. 78:316, 1994. (2) S. A. Gaetán et al. Plant Dis. 90:524, 2006. (3) P. Holliday and E. Punithalingam. Macrophomina phaseolina. No. 275 in: Descriptions of Plant Pathogenic Fungi and Bacteria. CMI, Kew, Surrey, UK, 1970. (4) M. Li et al. Aust. Plant Dis. Notes 2:93, 2007.

It seems clear that people who are deaf ... struggle continually against the meanings that others impose on their experience, and the way that this separates them from others. They struggle for acknowledgement of the way they see their lives and wish to live them, and aspire to connection?with other people, to share and belong. (David Moorhead. Knowing Who I Am. 1995. 85.) Nga Tapuwae and Before I am deaf but, before that part of my life started, I was hearing and worked for many years as a librarian in New Zealand. My first job was in a public library located within a secondary school Nga Tapuwae Secondary College in South Auckland. Its placement was a 1970’s social experiment to see if a public library could work within the grounds of a community college (and the answer was no, it could not). The experience was a great introduction for me to the Maori and Polynesian cultures that I had not previously encountered. Until then, I was wary of both groups, and so it was a revelation to realise that although there were many social problems in the area including low literacy, many of the children and teenagers were bright, talented individuals. They simply did not connect to the Anglo-Saxon reading materials we offered. Years later, my interest in the social dynamics of literacy led to my enrolment in a post-graduate literacy degree in Melbourne. This action may have saved my life because at the end of this course, a minor ailment resulted in a visit to the university doctor who diagnosed me with the life-threatening medical condition, Neurofibromatosis Type 2 (NF 2). NF2 is a late onset genetic condition in which one’s body grows tumours, always on both hearing nerves, sometimes elsewhere as well. The tumours usually cause deafness and can cause death. I was told I needed to have my tumours removed and would probably become fully deaf as a result. This is how my life as I knew it changed direction and I started the long journey towards becoming deaf. Diagnosis and Change Predictably, once diagnosed, friends and colleagues rallied to comfort me. I was told things probably weren’t as bad as they sounded. Helen Keller was mentioned several times as an example of someone who had succeeded despite being deaf and blind. ‘Really,’ my friends asked, ‘how bad can it be? ‘Inside myself however, it couldn’t have been worse. A day later the enormity of it all hit me and I became inconsolable. A friend drove me back to the doctor and she did two things that were to change my life. She referred me to the University’s counselling services where, happily, I was counselled by Elizabeth Hastings who later went on to become Australia’s first Disability Services Commissioner. Secondly, the doctor organised for me to visit the HEAR Service at the Victorian Deaf Society (VDS). Again by happy accident, my friend and I stumbled into the ‘wrong building’ where I ended up meeting John Lovett, who was Deaf and the CEO there, via an interpreter. When I met John Lovett I was distraught but, unlike other people, he made no attempt to stop me crying. He simply listened carefully until I realised he understood what I was saying and stopped crying myself. He said my fears that I could end up alone and lonely were valid and he suggested the best thing I could do for myself was to join the ‘Deaf community’; a community. I had never heard of. He explained it was made up of people like him who used Australian sign language (Auslan) to communicate. He was so engaging and supportive that this plan sounded fine to me. By the time we finished talking and he walked me over to the HEAR Service, I was so in his thrall that I had enrolled for a Deaf awareness workshop, an Auslan class, and had plans to join the Deaf community. Had I stayed on and learned Auslan, my life may well have followed a different path, but this was not to be at that time. Becoming Hearing Impaired (HI) Across at the HEAR service, an alternate view of my potential future was put to me. Instead of moving away from everything familiar and joining the Deaf community, I could learn to lip-read and hopefully use it to stay in the workforce and amongst my hearing friends. I had a cousin and aunt who were late deafened; my cousin in particular was doing well communicating with lip-reading. I discussed this with friends and the idea of staying with the people I already knew sounded far less confronting than joining the Deaf community and so I chose this path. My surgeon was also optimistic. He was confident he could save some of my hearing. Suddenly learning Auslan seemed superfluous. I phoned John Lovett to explain, and his response was that I should do what suited me, but he asked me to remember one thing: that it was me who decided to leave the Deaf Community, not that the Deaf community had not wanted me. He told me that, if I changed my mind, I could always go back because the door to the Deaf community would always be open and he would be still be there. It would be a decade before I decided that I wanted to go back through that door, and around that time this great man passed away, but I never forgot my promise to remember our conversation. It, and a few other exchanges I had with him in the following years, stayed at the back of my mind, especially as my residual hearing sank over the years, and the prospect of total deafness hung over me. When I had the surgery, my surgeon’s optimism proved unfounded. He could not save any hearing on my left side and my facial and balance nerves were damaged as well. The hospital then decided not to operate again, and would only attempt to remove the second tumour if it grew and threatened my health again. Consequently, for close to a decade, my life was on hold in many ways. I feared deafness—for me it signalled that my life as I knew it would end and I would be isolated. Every hearing test was a tense time for me as I watched my remaining hearing decline in a slow, relentless downward path on the graph. It was like watching the tide go out knowing it was never going to come in as fully again. My thinking started to change too. Within a week of my diagnosis I experienced discrimination for the first time. A library school that had offered me a place in its post graduate librarianship course the following year made it clear that they no longer wanted me. In the end it did not matter as I was accepted at another institution but it was my first experience of being treated less favourably in the community and it was a shock. After the surgery my life settled down again. I found work in public libraries again, rekindled an old relationship and in 1994 had a baby boy. However, living with a hearing loss is hard work. Everything seemed tiring, especially lip-reading. My ears rejected my hearing aid and became itchy and inflamed. I became aware that my continual hearing problems were sometimes seen as a nuisance in work situations. Socialising lost a lot of its appeal so my social world also contracted. Around this time something else started happening. Outside work, people started expressing admiration for me—words like ‘role model’ and ‘inspiring’ started entering the conversation. Any other time I might have enjoyed it but for me, struggling to adapt to my new situation, it felt odd. The whole thing reminded me of being encouraged to be like Helen Keller; as if there is a right way to behave when one is deaf in which you are an inspiration, and a wrong way in which one is seen as being in need of a role model. I discussed this with Elizabeth Hastings who had helped me prepare mentally for the surgery and afterwards. I explained I felt vulnerable and needy in my new situation and she gave me some useful advice. She thought feeling needy was a good thing as realising one needs people keeps one humble. She observed that, after years of intellectualising, educated people sometimes started believing they could use intellectualisation as a way to avoid painful emotions such as sadness. This behaviour then cut them off from support and from understanding that none of us can do it alone. She believed that, in always having to ask for help, people with disabilities are kept aware of the simple truth that all people depend on others to survive. She said I could regard becoming deaf as a disability, or I could choose to regard it as a privilege. Over the years the truth of her words became increasingly more evident to me as I waded through all the jargon and intellectualisation that surrounds discussion of both deafness and the disability arena, compared to the often raw emotion expressed by those on the receiving end of it. At a personal level I have found that talking about emotions helps especially in the face of the ubiquitous ‘positive thinking’ brigade who would have us all believe that successful people do not feel negative emotions regardless of what is happening. The Lie Elizabeth had initially sympathised with my sadness about my impending deafness. One day however she asked why, having expressed positive sentiments both about deaf people and people with disabilities, I was saying I would probably be better off dead than deaf? Up until that conversation I was unaware of the contradictions between what I felt and what I was saying. I came to realise I was living a lie because I did not believe what I was telling myself; namely, that deaf people and people with disabilities are as good as other people. Far from believing this, what I really thought was that being deaf, or having a disability, did lessen one’s worth. It was an uncomfortable admission, particularly sharing it with someone sitting in a wheelchair, and especially as up until then I had always seen myself as a liberal thinker. Now, faced with the reality of becoming deaf, I had been hoist by my own petard, as I could not come to terms with the idea of myself as a deaf person. The Christian idea of looking after the ‘less fortunate’ was one I had been exposed to, but I had not realised the flip side of it, which is that the ‘less fortunate’ are also perceived as a ‘burden’ for those looking after them. It reminded me of my initial experiences years earlier at Nga Tapuwae when I came face to face with cultures I thought I had understood but did not. In both cases it was only when I got to know people that I began to question my own attitudes and assumptions and broadened my thinking. Unfortunately for deaf people, and people with disabilities, I have not been the only person lying to myself. These days it is not common for people to express their fears about deaf people or people with disabilities. People just press on without fully communicating or understanding the other person’s attitude or perspectives. When things then do not work out, these failures reinforce the misconceptions and these attitudes persist. I believe it is one of the main reasons why true community inclusion for deaf and people with disabilities is moving so slowly. Paying for access is another manifestation of this. Everyone is supportive of access in principle but there is continuous complaint about paying for things such as interpreting. The never-ending discussions between deaf people and the wealthy movie industry about providing more than token access to captioned cinema demonstrate that the inclusion lie is alive and well. Until it can be effectively addressed through genuine dialogue, deaf people, hard of hearing people and people with disabilities will always be largely relegated to life outside the mainstream. Collectively we will also continue to have to endure this double message that we are of equal value to the community while simultaneously being considered a financial burden if we try to access it in ways that are meaningful to us. Becoming Deaf In 2002 however all this thinking still lay ahead of me. I still had some hearing and was back living in New Zealand to be close to my family. My relationship had ended and I was a solo mother. My workplace had approved leave of absence, and so I still had my job to go back to in Melbourne if I wanted it. However, I suspected that I would soon need the second tumour removed because I was getting shooting pains down my face. When my fears were confirmed I could not decide whether to move back to Melbourne or let the job go, and risk having trouble finding one if I went back later. I initially chose to stay longer as my father was sick but eventually I decided Melbourne was where I wanted to be especially if I was deaf. I returned, found temporary employment, and right up to the second surgery I was able to work as I could make good use of the small amount of hearing I still had. I thought that I would still be able to cope when I was made fully deaf as a result of the surgery. It was, after all, only one notch down on the audiogram and I was already ‘profoundly deaf’ and still working. When I woke up after the surgery completely deaf, it felt anti-climactic. The world seemed exactly the same, just silent. At home where I was surrounded by my close family and friends everything initially seemed possible. However, when my family left, it was just my seven-year-old son and myself again, and on venturing back into the community, it quickly became clear to me that at some level my status had changed. Without any cues, I struggled to follow speech and few people wanted to write things down. Although my son was only seven, people communicated with him in preference to me. I felt as if we had changed roles: I was now the child and he was the adult. Worse was soon to follow when I tried to re-enter the workforce. When I had the surgery, the hospital had installed a gadget called an auditory brainstem implant, (ABI) which they said would help me hear. An ABI is similar to a cochlear implant but it is attached to the brainstem instead of the cochlear nerve. My cochlear nerve was removed. I hoped my ABI would enable me to hear enough to find work but, aside from clinical conditions in which there was no background noise and the staff knew how to assist, it did not work. My most humiliating moment with it came when it broke down mid job interview and I spent half the time left trying to get it going again in full view of the embarrassed interview panel, and the other half trying to maintain my composure whilst trying to lip-read the questions. The most crushing blow came from the library where I had happily worked for seven years at middle management level. This library was collaborating with another institution to set up a new library and they needed new staff. I hopefully applied for a job at the same level I had worked at prior to becoming deaf but was unsuccessful. When I asked for feedback, I was told that I was not seen as having the skills to work at that level. My lowest point came when I was refused a job unpacking boxes of books. I was told I did not have experience in this area even though, as any librarian will attest, unpacking boxes is part of any librarian’s work. When I could not find unskilled work, it occurred to me that possibly I would never work again. While this was unfolding, my young son and I went from being comfortable financially to impoverished. My ex-partner also decided he would now make childcare arrangements directly with my son as he was annoyed at being expected to write things down for me. My relationship with him, some family members, and my friends were all under strain at that time. I was lost. It also became clear that my son was not coping. Although he knew the rudiments of Auslan, it was not enough for us to communicate sufficiently. His behaviour at school deteriorated and one night he became so frustrated trying to talk to me that he started to pull out his own hair. I calmed him and asked him to write down for me what he was feeling and he wrote down ‘It is like you died. It is like I don’t have a Mum now’. It was now clear to me that although I still had my friends, nobody including myself knew what to do. I realised I had to find someone who could understand my situation and I knew now it had to be a Deaf person. Fortunately, by this stage I was back learning Auslan again at La Trobe University. The week after the conversation with my son, I told my Auslan teacher what had happened. To my relief she understood my situation immediately. She told me to bring my son to class, at no cost, and she would teach him herself. I did and my life started to turn around. My son took to Auslan with such speed and application that he was able to not only converse with her in one month but immediately started using Auslan with me at home to get the things he wanted. We were able to re-establish the mother/son relationship that we both needed. I was also able to help my son talk through and deal with all the changes that me becoming deaf had foisted upon him. He still uses Auslan to talk to me and supplements it using speech, copious finger spelling, notes and diagrams. More than anything else, this relationship has kept me anchored to my long-term goal of becoming a clear signer. Encouraged by my son’s success, I put all my energy into learning Auslan and enrolled in a full time TAFE Auslan course. I also joined a chat group called ‘Here to Hear’ (H2H). The perspectives in the group ranged from strongly oral to strongly Deaf but for me, trying to find a place to fit in any of it, it was invaluable. Almost daily I chatted with the group, asking questions and invariably someone responded. The group acted as a safety net and sounding board for me as I worked out the practicalities of living life deaf. The day of my fateful interview and the ABI humiliation, I came home so shaken that I used the Irish remedy of a couple of swigs of whisky, and then went online and posted an account of it all. I can still remember the collective indignation of the group and, as I read the responses, beginning to see the funny side of it . . . something I could not have done alone. I also made use of easy access to Deaf teachers at TAFE and used that to listen to them and ask advice on situations. I found out for example, that if I instructed my son to stand behind me when people in shops insisted on addressing him, they had no alternative but to talk to me; it was a good clear message to all concerned that my son was the child in this relationship. About this time, I discovered the Disability Discrimination Act (DDA) that Elizabeth Hastings had worked so hard on, filed my first DDA complaint, and received my first apology at the mediation session that followed. My personal life also improved, relationship by relationship as everyone adjusted. Slowly the ice melted in most of my relationships; some relationships faded and were replaced with new ones with signing people, and eventually hearing people again. My life moved forward. Through a member of ‘Here to Hear’, I was invited to apply for my first post deaf job—covering holiday leave at a Deaf sports organisation. I practically finger-spelt my way through the interview but not only did they offer me the job, they were delighted to have me. I was able to buy a few things with the money I earned, and suddenly it felt as if everything was possible again. This acceptance of me by Deaf people had a profound impact on me. I mixed with people more, and it was not too long before I was able to use my basic signing skills to use Auslan interpreters and re-enter the workplace. I have discovered over time that living in silence also has advantages—no more noisy parties or rubbish trucks clanging at dawn and in its place a vastly heightened visual awareness that I enjoy. Before I was deaf I thought it would be lonely in the silence but in fact many of life’s best moments—watching rain hit and then run down a window, swimming in the sea, cooking and being with good friends—do not rely upon sound at all; they feel the same way they always did. Sometimes I have felt somewhat of an outsider in the Deaf community. I have sometimes been taken aback by people’s abruptness but I have learned over time that being succinct is valued in Auslan, and some people like to come straight to the point. At crisis points, such as when I asked for help at the Victorian Deaf Society and my Auslan class, it has been a huge relief to talk to Deaf people and know immediately that they understand just from reading their eyes. Having access to an additional world of deaf people has made my life more enjoyable. I feel privileged to be associated with the Deaf community. I can recall a couple of Christmases ago making dinner for some signing friends and suddenly realising that, without noticing, everything had become alright in my world again. Everyone was signing really fast – something I still struggle with; but every now and then someone would stop and summarise so I felt included. It was really relaxed and simply felt like old times, just old times without the sound thrown in. Le Page and Tabouret-Keller, two ethnographers, have this to say about why people communicate the ways they do: The individual ... creates for himself the patterns of his linguistic behaviour so as to resemble those of the group or groups with which from time to time he wishes to be identified, or so as to be unlike those from whom he wishes to be distinguished ... . We see speech acts as acts of projection; the speaker is projecting his inner universe, implicitly with the invitation to others to share it ... he is seeking to reinforce his models of the world, and hopes for solidarity from those with whom he wishes to identify. (181) This quote neatly sums up why I choose to communicate the ways I do. I use Auslan and speech in different situations because I am connected to people in both groups and I want them in my life. I do not feel hugely different from anyone these days. If it is accepted that I have as much to contribute to the community as anyone else, becoming deaf has also meant for me that I expect to see other people treated well and accepted. For me that means contributing my time and thoughts, and advocating. It also means expecting a good level of access to interpreters, to some thought provoking captioned movies in English, and affordable assistive technologies so I can participate. I see this right to participate and engage in genuine dialogue with the rest of the community as central to the aspirations and identity of us all, regardless of who we are or where others think we belong. References Le Page, R.B., and Andree Tabouret-Keller. Acts of Identity: Creole-Based Approaches to Language and Ethnicity. London: Cambridge University Press, 1985. Moorhead, D. “Knowing Who I Am.” In S. Gregory, ed., Deaf Futures Revisited. Block 3, Unit 10, D251 Issues in Deafness. Open University, 1995.

Bibliography: leaves 78-83. "The dissertation brings together discourses relating to sustainability with that of the environment, at least in terms of its meaning and responses to it being culturally constructed. The Central Adelaide Hills provides the locality for achieving this, which a peri-urban environment is subject to the power exerted by urban Adelaide as well as the tension arising out of land use conflict and attitudes to the environment."

Bibliography: leaves [156-167] Map 1. Parachilna, sheet SH 54-13 / compiled by P. Reid and W.V. Preiss. 2nd ed. [Adelaide] : Primary Industries & Resources SA, 1999. 1 map : col ; 69 x 100 cm. (South Australia. Geological Survey. Geological atlas 1:250 000 series ; sheet SH 54-13) -- map 2. Geology of the Flinders Ranges National Park. Parkside, S. Aust. : Mines and Energy South Australia, 1994. 1 map : col. ; 84 x 60 cm. Scale: 1:75 000.

Some of Australia’s most pressing conservation problems are found in the arid and semi-arid rangelands where the traditional major land-use is extensive pastoralism. Yet with the emergence of a change in resource values, the rangelands of Australia have started to move away from a strict production land-use towards a multifunctional land-use where pastoralism, tourism and the environment have an influence on one another. With the present mixture of consumption and protection values in the rangelands, ecotourism represents a model for achieving a symbiotic relationship between tourism activity and conservation in a pastoral setting. This study develops a theoretical framework for understanding the relationships between ecotourism, pastoralism and ecological recovery efforts in the Flinders Ranges through employing mixed qualitative and quantitative research techniques to examine the perceptions and practices of tourism operators, local landholders and visitors to the study site. The study finds that while pastoralism and its level of success often remain variable, the strength and stability of tourism is increasing. Because economics is a central component of the concept of sustainability, and because we must manage the environment while accommodating tourists, ecotourism is one way to help reach rangeland sustainability goals, provided that there are adequate levels of agreement amongst the local community and other land users. The results indicate that the vast majority of stakeholders are currently in a state of co-existence with each other rather than one of conflict, suggesting ecotourism has the potential to assist ecological recovery. However, many landholders are constrained in their ability to integrate ecotourism operations and conservation due to economic difficulties and market barriers. There are also conflicting results among visitors who claim to be interested in ecotourism but do not necessarily act accordingly, highlighting the need for a greater focus on environmental education. Ecotourism should be incorporated into a regional sustainability plan where the public are able to assist decision makers through collaborative planning. The thesis concludes that when well-managed, ecotourism can be a business supporting conservation in the Flinders Ranges. It contributes to knowledge of the role that ecotourism can play in encouraging ecological recovery in the rangelands and explores the complex interrelationships involved through consultation with the primary stakeholders of landholders, tourism operators and visitors.
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Thesis (Ph.D.) - University of Adelaide, School of Social Sciences, 2008

This thesis examined the impact of anthropogenic alterations in four riverine catchments of the Eastern Mt. Lofty Ranges, South Australia, to identify if creek restoration via environmental flows is a viable management option and if so, to determine; 1) Whether an aquatic/riparian viable seed bank was present and if so what was its composition 2) The ecological condition of selected riverine reaches. This in combination with the seed bank study would identify those creeks that would most benefit from the imposition of environmental flows 3) The response of key species to the water regimes likely to result from the imposition of environmental flows 4) The influence of nutrient enrichment under a fluctuating water level and to use this information to formulate best practice policy for environmental flows 5) Whether aquatic plants promoted by environmental flows were a significant fraction of the diet for higher trophic levels represented by Trichopterans and Amphipods. The seed banks were of comparable density (ranging from 4,000 to 110,000 seeds m-2) and species richness (ranging from 13 to 20 aquatic / riparian species) to the seed banks of other Australian rivers and wetlands, but this varied significantly among riverine sections and across catchments. Out of a total of 81 species recorded, 51 were classified as terrestrial (63% of all species recorded). What is of greater concern was the number of exotic (both aquatic and terrestrial) species recorded: 43% of the species recorded in the Angas, 47% of the species in the Finniss, 39% of the species in Tookayerta creek and 43% of the species recorded in Currency creek were exotic, which are significantly higher in comparison to other Australian studies. There were 24 to 28 aquatic/riparian species recorded in the extant vegetation of each catchment that were not recorded in their seed banks. Likewise, a number of species (3 to 7) were recorded in each catchments seed bank that were not recorded in the extant vegetation of those catchments. A species of particular interest is Crassula sieberana, which is on the State endangered plant species list. Indices for assessing the ecological condition, health or integrity of a river or riparian habitat were employed to investigate the relationship between the river/riparian habitat and the land and water management practices associated with those habitats. Of the four catchments surveyed, each catchment identified a unique set of site parameters (subindex indicators) that were strongly correlated with its ecological condition. Indicator species analyses revealed pasture grasses to be a significant indicator of reaches in very poor condition (p = 0.0010) along the Finniss and Baumea juncea of those reaches in good condition (p = 0.0230). Along the Angas, Cotula coronopifolia was an indicator of those reaches in average condition (p = 0.0240) and along Currency creek, Cladium procerum was an indicator of those reaches in good condition (p = 0.0190). However, when all 115 surveyed reaches were analysed together, those reaches of average to excellent ecological condition were all strongly correlated (R2 = 0.50) with the subindex indicators: bank stability, % riparian cover, grazing, fenced, aquatic wood, and width of the riparian vegetation. This would indicate that these subindex indicators are the main site parameters determining the ecological condition of a riverine reach and hence its restoration potential. Those catchments or sub-catchments containing a high proportion of reaches classified to be in poor to very poor condition had significantly reduced seed banks. The influence of water level fluctuations (±15 cm, ±30 cm and ±45 cm) on the growth of four species of emergent macrophytes (Cyperus vaginatus, Phragmites australis, Typha domingensis and Triglochin procerum) were species dependent. These species naturally inhabits different zones across the elevation gradient. C. vaginatus, which has a high elevation preference, was strongly inhibited by increasing water depth and fluctuations in water levels. In contrast, species with an intermediate elevation preference, such as Phragmites australis and Typha domingensis, were more tolerant to both depth and water level fluctuations. However, the biomass and relative growth rate (RGR) of T. domingensis and P. australis were depressed when grown under the combination of deep elevation and a highly fluctuating water level (±45 cm). Between the static and ±45 cm amplitude treatments, growth of T. domingensis was inhibited by 52%. The growth of P. australis appeared to be enhanced by fluctuating water levels and only showed a severe drop-off in growth in the deep elevation, ±45 cm amplitude treatment. In C. vaginatus the RGR was dependent of the average emergent surface area (and the implied rate of carbon acquisition)(p<0.0001; r2=0.7196; F=87.276; n=36; RGR (mg g-1 day-1) = -5.096 + 4.313 × ln (Average emergent surface area (cm2)), but this was not the case in P. australis and T. domingensis (p>0.05) even when the photosynthetic canopy was partially inundated by rising water levels. Yet these two species demonstrated different growth rates when grown under different water regime amplitudes and at different elevations. Growth of T. procerum did not respond to either amplitude or elevation, but its RGR remained negative. This suggests that another factor(s) was limiting the growth of P. australis, T. domingensis and possibly T. procerum, a factor that varies with water level. Cyperus gymnocaulos had significantly increased plant performance (p <.0001) with increased nutrient loading rates but this effect was significantly reduced under a fluctuating water regime (p =0.0007). Remarkably, under a fluctuating regime, P. australis had a significant reduction in performance with increased nutrient loading rates (p =0.0013), whereas T. domingensis performance was significantly limited (p =0.034) even with increased nutrient loading rates. T. procerum too had increased plant performance with increased nutrient loading rates but this effect was reduced under a fluctuating regime. The morphological response by T. procerum demonstrates that it is mainly limited by the nutrient loading rates and not the water regime. However, it was significantly limited/reduced by its increased turnover rates caused by a stochastic fluctuating water regime. Illustrating that in fact the effects of nutrient enrichment on T. procerum were independent of water regime but bearing in mind that water regime is the primary factor determining the productivity of this species. For those species with higher elevation preferences, e.g. C. gymnocaulos, or low elevation preference, e.g. T. procerum, the effects of nutrient loading are independent of water regime, whereas those species with an intermediate elevation preference, e.g. P. australis and T. domingensis the effects of nutrient loading are largely dependent on the water regime. Amphipoda and Trichoptera selectively fed on succulent semi-emergent macrophytes across sites of average to excellent ecological condition (31-64% to 65-97% of diet), depending on availability. These semi-emergent macrophytes contained the lowest C:N ratio (≈10:1), closest to that of their consumers (≈5:1) and therefore the highest nutritional content. In degraded riverine reaches, there were limited food resources available, hence course particulate organic matter (CPOM) formed the main dietary components of Amphipoda (20-53% of diet) even though it had the highest C:N ratio (≈40:1). At site VP. 1, filamentous algae was the main dietary component of Trichoptera (48-64% of diet) due to its availability and its low C:N ratio (≈14:1) in comparison to the other primary sources available. The imbalanced consumer-resource nutrient ratios in these degraded riverine reaches are likely to impose constraints on the growth and reproduction of their aquatic shredder communities with probable knock-on effects at higher trophic levels. The installation of environmental flows to restore and promote aquatic/riparian plant communities, which in turn would benefit higher trophic organisms, is a viable and realistic management option along selected reaches. Those selected reaches contain a significant aquatic/riparian seed bank and with sufficient physical habitat remaining to promote their germination and establishment. However, the imposition of environmental flows as a control measure to prevent the colonisation and dominance of particular species (T. domingensis and P. australis) was deemed to be redundant as a management technique given the limited water resources available.
Thesis (Ph.D.) -- School of Earth and Environmental Sciences, 2007

The Ormen Lange offshore pipelines from shore to the field go through very difficult terrain creating freespans in the range 40–80m for the 30” lines. For the 6” lines long freespans will be present prior to burial and vortex induced vibrations (VIV) will give a contribution during laying due to strong currents. Using existing codes for fatigue calculation was giving too conservative results compared to the welding technology used and experience from SCR work showed that better S-N data should be expected. A dedicated program was started as part of the Ormen Lange (OL) technology verification program overseen by Norwegian Authorities. An overview of the results is presented here. A full evaluation of the data is not yet complete. Papers will be published later presenting the full technical details and dataprocessing. Fatigue test results from the OL pipeline fatigue verification are presented focusing on the following topics: • Defect sizes in pipeline production welds; • Contractor-A: 5G welding position; • Contractor-B: 2G welding position; • 6” pipe full scale testing; • 30” pipe full scale testing; • Residual stresses; • Crack growth tests and sector specimen fatigue tests in production environments. The following are a summary of the main test variables in the program: • Mapping of actual welding defects compared to AUT results. • Welds with varying misalignment (high/low) and lack of penetration (LOP) from installation contractors tested in air. • Welds with natural welding defects in internal environment (Condensed water and formation water). • Welds with notches made by electrical discharge machining (EDM) (2×65mm and 2×15mm) in internal environment (condensed water and formation water). • Crack growth tests using large compact tension (CT) specimens in air, seawater and internal product environments (condensed water and formation water). • Full scale tests including worst case high/low, LOPs, and tests with normal welds including repair welds. The following main conclusions can be drawn from the work: • Small scale testing with representative worst case defects predicts well large scale testing results with the same features when the small scale specimen stresses are corrected for bending moments etc. arising from the cutout of the pipe. • Full scale testing of 30”×35.5mm wall thickness 2G pipes welded continuously (without start/stop) with worst case defects and high/low exceeds the D curve. • Full-scale tests of 30”×35.5mm wall thickness 5G non continuous welds with worst case defects and high/low exceeds the E curve. • Pipe welds showed low or even compressive residual stresses in the root. For continuously welded pipes the stress levels were low but more varying, also on the cap side. This partly explains the good results. • It is verified that the fatigue loads during operation are below the threshold of crack growth, and thus fatigue will not be a probable failure mechanism. This is under the condition that the measurements of vortex induced vibrations (VIV) during operation confirm the engineering calculations.