Journal articles on the topic 'The South Australian Experiment'
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1
Huyer, A., RL Smith, PJ Stabeno, JA Church, and NJ White. "Currents off south-eastern Australia: results from the Australian coastal experiment." Marine and Freshwater Research 39, no. 3 (1988): 245. http://dx.doi.org/10.1071/mf9880245.
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The Australian Coastal Experiment was conducted off the east coast of New South Wales between September 1983 and March 1984. The experiment was conducted with arrays of current meters spanning the continental margin at three latitudes (37.5�, 34.5�, and 33.0�S.), additional shelf moorings at 29� and 42�S. coastal wind and sea-level measurements, monthly conductivity-temperature-depth probe/expendable bathythermograph (CTD/XBT) surveys, and two satellite-tracked buoys. Over the continental shelf and slope, the alongshore component of the current generally exceeded the onshore component, and the subtidal (<0.6 cpd, cycles per day) current variability greatly exceeded the mean flow. Part of the current variability was associated with two separate warm-core eddies that approached the coast, causing strong (>50 cm sec-1), persistent (>8 days), southward currents over the continental slope and outer shelf. Temperature and geostrophic velocity sections through the eddies, maps of ship's drift vectors and temperature contours at 250 m, and the satellite-tracked drifter trajectories showed that these eddies were similar in structure to those observed previously in the East Australian Current region. Both eddies migrated generally southward. Eddy currents over the shelf and slope were rare at Cape Howe (37.5�S.), more common near Sydney (34.5�S.), and frequent at Newcastle (33.0�S.), where strong northward currents were also observed. Near Sydney, the eddy currents over the slope turned clockwise with depth between 280 and 740 m, suggesting net downwelling there. Repeated CTD sections also indicated onshore transport and downwelling at shallower levels; presumably, upwelling occurred farther south where the eddy currents turned offshore. Periodic rotary currents over the continental slope near Sydney and Newcastle indicated the presence of small cyclonic eddies on the flank of a much larger anticyclonic eddy. Between early October and late January, no strong southward currents were observed over the continental margin near Sydney. Data from this 'eddy-free' period were analysed further to examine the structure and variability of the coastal currents. Much of this variability was correlated with fluctuations in coastal sea-level (at zero lag) and with the wind stress (at various lags). The coherence and phase relationships among current, wind-stress, and sea-level records at different latitudes (determined from spectral analysis and frequency-domain empirical orthogonal functions) were consistent with the equatorward propagation of coastal-trapped waves generated by winds in phase with those near Cape Howe. Time-domain empirical orthogonal functions show that the current fluctuations decayed with distance from shore and with depth, as expected of coastal-trapped waves.
2
Tomczak, M., and E. Tanner. "An estimate of Bass Strait water Movement in the Western Tasman Sea during the Australian Coastal Experiment." Marine and Freshwater Research 40, no. 5 (1989): 465. http://dx.doi.org/10.1071/mf9890465.
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The presence and movement of Bass Strait Water along the continental slope of south-eastern Australia during the Australian Coastal Experiment (ACE) is estimated by evaluating the amount of salt and heat imported from Bass Strait for the five standard hydrographic ACE sections. South of Jervis Bay (35°S), the amounts decrease from September 1983 to February 1984 by a factor of two. North of Jervis Bay, the amounts depend strongly on the position of the East Australian Current and its eddies. It appears that during periods of low eddy activity Bass Strait Water can be carried northward well past Newcastle (33�S).
3
Francis, RICC, and RH Winstanley. "Differences in growth rates between habitats of South-east Australian snapper (Chrysophrys auratus)." Marine and Freshwater Research 40, no. 6 (1989): 703. http://dx.doi.org/10.1071/mf9890703.
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Data on recaptured fish from two tagging experiments on south-east Australian snapper, Chrysophrys auratus, were analysed: 198 fish released in several Victorian locations between 1956 and 1962, and 118 fish released in Port Phillip Bay in 1971 and 1972. Movement data from both experiments were used to classify the fish into habitats (oceanic and bay) and stocks (western and eastern). Length increment data from the earlier experiment indicate that the major growth-rate differences in south-east Australian snapper lie within the western stock (between oceanic and bay habitats) rather than between stocks as suggested by an earlier analysis of the same data. The annual growth rates of 20-30-cm snapper in Port Phillip Bay and Western Port are 17-20% higher than for fish in the ocean. Oceanic growth rates in the western stock appear to be lower than those in the eastern stock. Procedural differences in length measurements at tagging and recapture can introduce a net bias in the length increment that, if ignored (as is conventional in tagging growth models), will bias growth rate estimates. In the earlier tagging experiment, this is shown to have caused a 10% positive bias in growth rate estimates.
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Forbes, AMG. "Wind stress in the Australian coastal experiment region." Marine and Freshwater Research 38, no. 4 (1987): 475. http://dx.doi.org/10.1071/mf9870475.
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During the 6 months of the Australian Coastal Experiment (ACE), recordings were made by the Australian Bureau of Meteorology of several meteorological parameters at a number of coastal stations and by the CSIRO at several offshore locations to complement the ACE current-meter and sea-level gauge array. The aim was to examine the wind field over the New South Wales coast and so determine the magnitude of long shelf wind stress, which might locally force coastal trapped waves (CTW). Wind stress decreased equatorward, with the greatest potential for local CTW forcing lying on the southernmost continental shelf near Gabo Island. No significant variation in the magnitude of wind stress across the shelf within 20 km of the coast was observed. Despite the low sampling frequency at most coastai stations (twice daily, a subset of well-exposed coastal stations was sufficient to characterize the wind field over the entire region. The study revealed equatorward phase propagation of 9.2 and 12.1 m s-1 at periods of 4.4 and 10.5 days respectively.
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Pease, Bruce C., Darren P. Reynolds, and Christopher T. Walsh. "Validation of otolith age determination in Australian longfinned river eels, Anguilla reinhardtii." Marine and Freshwater Research 54, no. 8 (2003): 995. http://dx.doi.org/10.1071/mf03040.
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The primary objective of the present study was to validate the annual nature of growth rings in otoliths of 'yellow eel stage' (fully pigmented, premigratory) Australian longfinned eels (Anguilla reinhardtii) in New South Wales, Australia, using a combination of laboratory and field experiments. Eels were injected with oxytetracycline (OTC) and tagged with external 'T-bar' tags. Microscopic examination of thin transverse sections of the sagittal otoliths from recaptured eels showed that one opaque annulus was typically formed in the otolith during each year subsequent to OTC marking. The seasonal timing of opaque annulus formation was highly variable, but generally occurred between May and November. Supernumerary (false or incomplete) rings were observed in many of the otoliths. Examination of otolith sections from a sample of very small, untagged yellow eels verifed the age at first annual increment formation. Marked and tagged longfinned eels did not have a significantly higher mortality rate than controls in the laboratory experiment, but tag loss rates may be high. The field study also indicates that Australian longfinned eels generally have a very restricted home range of 300 m or less. This study is believed to provide the first otolith age validation of a tropical anguillid.
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Evans, J. P., F. Ji, C. Lee, P. Smith, D. Argüeso, and L. Fita. "A regional climate modelling projection ensemble experiment – NARCliM." Geoscientific Model Development Discussions 6, no. 3 (September 25, 2013): 5117–39. http://dx.doi.org/10.5194/gmdd-6-5117-2013.
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Abstract. Including the impacts of climate change in decision making and planning processes is a challenge facing many regional governments including the New South Wales (NSW) and Australian Capital Territory (ACT) governments in Australia. NARCliM (NSW/ACT Regional Climate Modelling project) is a regional climate modelling project that aims to provide a comprehensive and consistent set of climate projections that can be used by all relevant government departments when considering climate change. To maximise end user engagement and ensure outputs are relevant to the planning process, a series of stakeholder workshops were run to define key aspects of the model experiment including spatial resolution, time slices, and output variables. As with all such experiments, practical considerations limit the number of ensembles members that can be simulated such that choices must be made concerning which Global Climate Models (GCMs) to downscale from, and which Regional Climate Models (RCMs) to downscale with. Here a methodology for making these choices is proposed that aims to sample the uncertainty in both GCMs and RCMs, as well as spanning the range of future climate projections present in the full GCM ensemble. The created ensemble provides a more robust view of future regional climate changes.
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Kallioinen, RUO, JM Hughes, and PB Mather. "Significance of Back Colour in Territorial Interactions in the Australian Magpie." Australian Journal of Zoology 43, no. 6 (1995): 665. http://dx.doi.org/10.1071/zo9950665.
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In eastern Australia, two forms of the Australian magpie occur: a white-backed form and a black-backed form. These two forms hybridise across northern Victoria and into South Australia. In this study the response of territorial magpies to caged intruders was examined. Pairs of adult male magpies were introduced into territories. Both were adult black-backed birds, but in each case one of them had its back painted white. The pair was introduced to each territory twice, with the bird that was painted white differing between times. The experiment was run in a population of black-backed birds and a population in the hybrid zone containing white-backed, black-backed and hybrid birds. In both cases, the residents were more aggressive towards the intruder with the white-back than they were to the black-backed intruder. We suggest that this may be because a white-backed bird posed more of a threat to residents than a black-backed bird.
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Dunn, B. W., G. D. Batten, T. S. Dunn, R. Subasinghe, and R. L. Williams. "Nitrogen fertiliser alleviates the disorder straighthead in Australian rice." Australian Journal of Experimental Agriculture 46, no. 8 (2006): 1077. http://dx.doi.org/10.1071/ea05004.
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Straighthead is a ‘physiological’ disorder of rice, the symptoms being floret sterility, deformed florets and panicles and reduced grain yield. Straighthead in rice is difficult to investigate because of its unpredictable occurrence under field conditions. An experiment was conducted in south-eastern Australia in 1996 to investigate the effect of rate and timing of N fertilisation on growth and yield of rice. The presence of straighthead at this location gave a unique opportunity to study the influence of crop N status. This paper reports the influence of N application on straighthead symptoms during this experiment. A significant reduction of straighthead occurred with higher rates of N application. Application of 250 kg N/ha pre-flood, improved plant growth and vigour with subsequent increased uptake and accumulation of S, P, K, Mg, Cu, Mn and Zn in the plant at panicle initiation. The reduction of straighthead at high nitrogen rates may be due to improved uptake of several essential nutrients, and Cu may be a critical nutrient. This study and earlier observations have shown the application of optimal levels of pre-flood nitrogen to achieve grain yields greater than 10 t/ha may reduce straighthead severity in the Australian rice-growing environment. The results in this paper are not presented as recommendations to growers but a contribution to the currently limited literature on straighthead in Australia.
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Blaney, Barry, Sukumar Chakraborty, and Sally-Ann Murray. "Alkaloid production by isolates of the sorghum ergot pathogen (Claviceps africana) from Australia and other countries." Australian Journal of Agricultural Research 57, no. 9 (2006): 1023. http://dx.doi.org/10.1071/ar05334.
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Isolates of Claviceps africana from Australia, Africa, Asia, and America were tested for the production of dihydroergosine (DHES), and its biogenic precursors dihydroelymoclavine (DHEL) and festuclavine (FEST), in culture. Several growth media were evaluated to optimise alkaloid production with little success. The best of these involved 2-stage culturing on high-sucrose substrate. Australian C. africana isolates varied widely and inconsistently in alkaloid production, with DHES concentrations in mycelium ranging from: <0.1 to 9 mg DHES/kg; <0.1 to 1.6 mg DHEL/kg; and <0.1 to 0.4 mg FEST/kg. In a separate experiment using similar culturing techniques, DHES was produced by 2 of 3 Australian isolates, 1 of 3 USA isolates, 1 of 4 Indian isolates, the sole Puerto Rican isolate, the sole Japanese isolate, but not the sole South African isolate. In this experiment, DHES concentrations detected in mycelium of Australian isolates (0.1–1.0 mg DHES/kg) were of similar magnitude to isolates from other countries (0.2–1.8 mg DHES/kg). Three C. africana isolates, including one that produced only traces of alkaloid in culture after 8 weeks, were inoculated onto panicles of sterile male sorghum plants. After 8 weeks, all 3 isolates produced 10–19 mg DHES/kg in the panicles, demonstrating that the growing plant favoured more consistent alkaloid production than culture medium.
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Pilkington, L. J., G. M. Gurr, M. J. Fletcher, E. Elliott, A. Nikandrow, and H. I. Nicol. "Reducing the immigration of suspected leafhopper vectors and severity of Australian lucerne yellows disease." Australian Journal of Experimental Agriculture 44, no. 10 (2004): 983. http://dx.doi.org/10.1071/ea03162.
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Three newly-sown lucerne stands in the mid Lachlan Valley region of New South Wales, Australia, were sampled, over 50 weeks, for Australian lucerne yellows disease symptom distribution and severity. Leafhopper populations were also monitored. Symptoms developed in all 3 stands within 32 weeks of sowing. There were statistically significant spatial differences in the density of symptomatic plants for 2 dates at this and another site. Two possible insect vectors, Austroagallia torrida and Batracomorphus angustatus were more numerous in some sections of crop margins at 2 sites. These 2 species and a third possible insect vector Orosius argentatus each had a statistically significant spatial and temporal correlation with symptomatic plant numbers for at least 1 site date. Two subsequent border treatment experiments evaluated the effect of crop-margin treatments on leafhopper movement into and from the stand. The second border treatment experiment examined also the treatment effect on Australian lucerne yellows disease symptomatic plant numbers. Treatment with insecticide or herbicide significantly reduced the overall movement of leafhoppers. In addition, the insecticide treatment lowered the incidence of disease expression in adjacent lucerne. Results suggest that there is scope for management of this plant disease by reducing immigration of leafhopper vectors into lucerne from non-crop vegetation.
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Greenslade, Penelope, and Yun-Xia Luan. "A new Australian record of a Parajapidae (Diplura): a potential pest of wheat." Soil Research 56, no. 7 (2018): 657. http://dx.doi.org/10.1071/sr18105.
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Parajapyx isabellae (Grassi, 1886) is recorded for the first time from Australia. It is a cosmopolitan soil species found in Europe, North and South America and Asia. Womersley last studied Australian Parajapygidae 80 years ago, listing a single endemic species for the genus Parajapyx Silvestri, 1903, sensu stricta. In 2017, an unidentified Parajapyx was found in deep soil under wheat in winter, spring and summer at Harden, New South Wales, in a long-term tillage trial. It was most abundant in the minimum tillage/stubble retained plots in soil below 5 cm but rarely observed in the conventionally tilled/stubble burned plots. The same field experiment was sampled five times using the same methods over 3 years from 1993–95 but no specimens of Diplura were collected. The specimens were identified as P. isabellae using morphology and confirmed with the DNA barcoding sequence data. Most species of Parajapygidae are carnivores feeding on small arthropods but there are records from North America, Europe and Hawaii of P. isabellae feeding on roots of wheat and other agricultural crops. We provide here illustrations of species P. isabellae so that crop scientists in Australia are aware of the potential pest and can identify it. Sequence data indicate that the population may have originated from two sources.
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Godfrey, Barry. "Prison Versus Western Australia: Which Worked Best, the Australian Penal Colony or the English Convict Prison System?" British Journal of Criminology 59, no. 5 (March 31, 2019): 1139–60. http://dx.doi.org/10.1093/bjc/azz012.
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Abstract Between 1850 and 1868, a natural experiment in punishment took place. Men convicted of similar crimes could serve their sentence of penal servitude either in Britain or in Australia. For historians and social scientists, this offers the prospect of addressing a key question posed over 200 years ago by the philosopher, penal theorist and reformer Jeremy Bentham when he authored a lengthy letter entitled ‘Panopticon versus New South Wales: Or, the Panopticon Penitentiary System, and the Penal Colonization System, Compared’. This article answers the underlying tenet of Bentham’s question, ‘Which was best prison or transportation?’ by applying two efficiency tests. The first tests whether UK convicts or Australian convicts had higher rates of reconviction, and the second explores the speed to reconviction.
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Doherty, Michael D., A. Malcolm Gill, Geoffrey J. Cary, and Mike P. Austin. "Seed viability of early maturing alpine ash (Eucalyptus delegatensis subsp. delegatensis) in the Australian Alps, south-eastern Australia, and its implications for management under changing fire regimes." Australian Journal of Botany 65, no. 7 (2017): 517. http://dx.doi.org/10.1071/bt17068.
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Eucalyptus delegatensis R.T. Baker subsp. delegatensis is an interval-sensitive, fire-killed eucalypt that dominates large tracts of montane forest in the Australian Alps. Although it has been widely accepted in forest management that E. delegatensis takes 20 years to flower and fruit after stand-replacing fire events, recent observations after high intensity fires in the Australian Alps have shown that early flowering and fruiting is occurring from what can be termed ‘precocious’ individuals in some areas. In some instances, early flowering and fruit set is occurring within 6 years after stand-replacing fire. One historical study in the Australian Capital Territory had noted that such seed was viable, but we found no reported experiments documenting this or detailing the degree of viability. Here we discuss the results of a germination experiment undertaken on seed collected from Namadgi National Park from early-maturing alpine ash trees. Although at the low end of known viability estimates for E. delegatensis, seed from these individuals was nonetheless found to be viable, with a mean of 455 (s.d. = 139) germinants per 10 g of chaff and seed mix. We discuss this result in relation to fire management in the Australian Alps and suggest further research that needs to be undertaken to better document and understand the phenomenon.
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Gillespie, Rob, and Marit E. Kragt. "Accounting for Nonmarket Impacts in a Benefit-Cost Analysis of Underground Coal Mining in New South Wales, Australia." Journal of Benefit-Cost Analysis 3, no. 2 (May 8, 2012): 1–29. http://dx.doi.org/10.1515/2152-2812.1101.
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Strategic inquiries into coal mining by Australian Governments advocate increased use of comprehensive benefit cost analyses and nonmarket valuation studies when assessing individual project proposals. The study reported in this paper addresses these Government concerns, by integrating results of a choice experiment into a benefit cost analysis undertaken for a Colliery in the Southern Coalfield of New South Wales, Australia. Results of the study were used to aid the State government in evaluating proposals for continued underground coal mining. We show that impacts of mine subsidence on streams, swamps, and Aboriginal sites negatively affect community wellbeing. Social welfare increases with the length of time that the mine provides direct employment. We demonstrate how implicit price estimates from the choice experiment can be incorporated into a benefit cost analysis of continued mining. Benefit cost analyses were carried out for a range of policy scenarios—including policies that would restrict mining activities at the Colliery and protect environmental and cultural features in the Southern Coalfield. Notwithstanding the environmental impacts generated by mining operations, continued mining is shown to be a more economically efficient course of action.
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Seymour, M. "Narbon bean (Vicia narbonensis) agronomy in south-western Australia." Australian Journal of Experimental Agriculture 46, no. 10 (2006): 1355. http://dx.doi.org/10.1071/ea04091.
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Narbon bean (Vicia narbonensis L.) shows promise as a fodder, green manure and grain crop in south-western Australia. This study examines the effect of time of sowing (2 experiments), plant density (3 experiments) and reaction to herbicides (4 experiments on tolerance to herbicides and 1 experiment on removing narbon bean from a wheat crop) in 10 separate field experiments sown at 4 locations in the mallee region of Western Australia from 1998 to 2001. Narbon bean was found to be unresponsive to changes in sowing date with yield maintained until the first week of June. The optimum plant density (90% of fitted maximum) for seed yield was found to be 31 plants/m2, equivalent to sowing rates in the range of 75–100 kg/ha. A wide range of herbicides applied either before sowing or immediately after sowing and before emergence had no significant effect on grain yield. These included simazine (750 g a.i./ha), cyanazine (1.25 kg a.i./ha) and diuron (500 g a.i./ha), which were applied immediately before sowing, and imazethapyr (29 g a.i./ha), which was applied after sowing, before emergence. Diflufenican (75 g a.i./ha) was found to be the only available option for post-emergence control of broadleaf weeds. The use of the non-selective herbicides glyphosate (450 g a.i./L) and Sprayseed 250 (paraquat 135 g a.i./L and diquat 115 g a.i./L) as post-emergence herbicides was found to be unpredictable at a range of application rates. Results ranged from a yield loss of 47% to a yield increase of 23%. In an experiment to test a range of herbicides for the selective control of narbon bean within a wheat crop, numerous herbicides were found to effectively remove volunteer narbon bean indicating that narbon bean is unlikely to become a weed in most cereal cropping systems.
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Liu, C. Y., J. G. Paull, and A. J. Rathjen. "Shoot mineral composition and yield of wheat genotypes grown on a sodic and a non-sodic soil." Australian Journal of Experimental Agriculture 40, no. 1 (2000): 69. http://dx.doi.org/10.1071/ea99031.
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A collection of wheat lines including 49 overseas and 35 Australian lines was grown in a 3-replicate randomised block design experiment at 2 sites (Two Wells and Roseworthy Campus, South Australia) during the 1994 growing season (June–December 1994). The aim of this investigation was to determine if elemental nutrients could be implicated in response to soil sodicity tolerance of wheat. Large grain yield differences and mineral concentrations were evident among different varieties including those from Australia. Several mineral concentrations in shoot, including manganese, potassium, sodium, phosphorus, boron, zinc and copper, taken up by these plants were correlated significantly with grain yield. The detrimental effects of sodium and boron concentrations on grain yields were less for local varieties than the overseas lines, because of lower average shoot concentrations and lower coefficients of variation associated with the Australian varieties. The grain yield reduction at a sodic site appeared to be due to both soil physical changes and nutritional changes, with the combined effects of nutrient deficiencies and toxicities accounting for 23% of the variation. Except for the large differences of boron and sodium concentrations, there appeared to be a similar magnitude of variability between the overseas wheat collection and the Australian wheats. The present study confirmed that the tetraploid and hexaploid wheats differ in sodium concentration or potassium : sodium ratio, in addition to other nutrient changes including potassium, manganese, magnesium and copper. However, sodium concentration (or potassium : sodium ratio) and boron were not sufficient enough to explain the variability in grain yield of all the Australian wheats studied, suggesting that other factors detrimental to wheat production in sodic soils need to be identified.
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Telfer, M., Z. Zhong, Y. Xu, D. Li, M. Zhang, and D. K. Zhang. "An Experimental Study of Calcination of South Australian Caroline Limestone." Developments in Chemical Engineering and Mineral Processing 8, no. 3-4 (May 15, 2008): 245–67. http://dx.doi.org/10.1002/apj.5500080306.
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Humphries, A. W., E. T. Kobelt, W. D. Bellotti, and G. C. Auricht. "Tolerance of Australian lucerne (Medicago sativa) germplasm to grazing by sheep." Australian Journal of Experimental Agriculture 46, no. 10 (2006): 1263. http://dx.doi.org/10.1071/ea04044.
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The sheep grazing tolerance of a diverse range of lucerne germplasm (Medicago sativa subspp. sativa, falcata and caerulea) was investigated at Roseworthy in South Australia. Lucerne entries were established on a sandy loam soil in 1998 and managed with rotational grazing management for the first 12 months. Continuous grazing by sheep in the following year reduced the plant density of each entry as measured by plant frequency estimates by 2–98%. Lucerne was allowed to recover, then grazed continuously for another 12 months. There was great diversity in tolerance to sheep grazing among the entries tested, with final plant frequency ranging from 0–13% for highly winter-active entries, 7–23% (at least 7–23 plants/m2) for winter-active entries and 11–40% for winter dormant entries. A grazing tolerance index of commercial cultivars was determined by comparing their plant frequency decline under continuous grazing to that under rotational grazing in an adjacent experiment. Australian-bred highly winter-active cultivars displayed a greater level of tolerance than those developed overseas. The superior performance of several breeders’ lines in the continuously grazed trial indicates there is further scope for improvement with selection and breeding.
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Sasaki, Wataru. "Impact of Satellite Data Assimilation in Atmospheric Reanalysis on the Marine Wind and Wave Climate." Journal of Climate 29, no. 17 (August 22, 2016): 6351–61. http://dx.doi.org/10.1175/jcli-d-16-0056.1.
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Abstract This study investigated the impact of assimilating satellite data into atmospheric reanalyses on trends in ocean surface winds and waves. Two experiments were performed using a numerical wave model forced by near-surface winds: one derived from the Japanese 55-year Reanalysis (JRA-55; experiment A) and the other derived from JRA-55 using assimilated conventional observations only (JRA-55C; experiment B). The results showed that the satellite data assimilation reduced upward trends of the annual mean of wave energy flux (WEF) in the midlatitude North Pacific and southern ocean (30°–60°S), south of Australia, from 1959 to 2012. It was also found that the assimilation of scatterometer winds reduced the near-surface wind speed in the midlatitude North Pacific after the mid-1990s, which resulted in the reduced trend in WEF from 1959 to 2012. By contrast, assimilation of the satellite radiances for 1973–94 increased near-surface wind speed in the southern ocean, south of Australia, whereas the assimilation of the scatterometer winds after the mid-1990s reduced wind speed. The latter led to the reduced trend in WEF south of Australia from 1959 to 2012.
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Trouillas, F. P., F. Peduto, J. D. Lorber, M. R. Sosnowski, J. Grant, W. W. Coates, K. K. Anderson, J. Caprile, and W. D. Gubler. "Calosphaeria Canker of Sweet Cherry Caused by Calosphaeria pulchella in California and South Australia." Plant Disease 96, no. 5 (May 2012): 648–58. http://dx.doi.org/10.1094/pdis-03-11-0237.
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California is the second largest sweet cherry producer in the United States with annual revenues up to $200 million. The South Australian cherry industry generates about 10% of Australia's overall production with approximately 1,500 metric tons of cherries produced yearly. In California, perennial canker diseases and subsequent branch dieback are responsible for extensive damage throughout sweet cherry orchards, reducing annual yields and tree longevity. Surveys of cherry orchards and isolation work were conducted in California to identify the main canker-causing agents. Calosphaeria pulchella was the main fungus isolated from cankers, followed by Eutypa lata and Leucostoma persoonii, respectively. Preliminary surveys in cherry orchards in South Australia documented C. pulchella and L. persoonii in cankers. The pathogenicity of C. pulchella in sweet cherry was confirmed following field inoculations of 2- to 3-year-old branches. C. pulchella was able to infect healthy wood and produce cankers with as much virulence as E. lata or L. persoonii. Spore trapping studies were conducted in two sweet cherry orchards in California to investigate the seasonal abundance of C. pulchella spores. Experiments showed that rain and sprinkler irrigation were important factors for aerial dissemination. Finally, this study illustrates the symptoms and signs of the new disease Calosphaeria canker.
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Garkaklis, Mark J., J. S. Bradley, and R. D. Wooller. "The relationship between animal foraging and nutrient patchiness in south-west Australian woodland soils." Soil Research 41, no. 4 (2003): 665. http://dx.doi.org/10.1071/sr02109.
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The woylie (Bettongia penicillata) was once common and abundant over the southern third of the Australian continent. Since European settlement the range of this rat-kangaroo has become reduced by more than 97%, and until the early 1990s, only 3 small natural populations remained, all in south-western Australia. These medium-sized (c. 1 kg) marsupials create a large number of diggings as they forage for the hypogeous fruiting bodies of ectomycorrhizal fungi upon which they feed. The effect of such foraging activity on the availability of plant nutrients in the vicinity of such diggings was evaluated in simulated digging experiments. Available nitrate, ammonium, and sulfur decreased significantly 3 years after diggings were constructed and had filled in, whereas phosphorus, potassium, iron, and organic carbon remained unchanged. The results suggest that preferential water infiltration via woylie diggings leads to a decrease in those soil nutrients that are susceptible to leaching and indicates that digging vertebrates may influence the distribution of surface soil nutrients.
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Rimmer, Susan Harris. "Australian experiments in creative governance, regionalism, and plurilateralism." International Journal: Canada's Journal of Global Policy Analysis 71, no. 4 (December 2016): 630–50. http://dx.doi.org/10.1177/0020702016686383.
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The previous Abbott government had prioritized a general attitude to foreign policy captured by the phrase “Jakarta not Geneva,” which signified a preference for bilateral or minilateral interactions with the region rather than United Nations-based multilateralism. With Julie Bishop MP as Australia’s first female foreign minister, the Coalition also prioritized economic diplomacy, as exemplified by the repeated refrain that Australia is “open for business.” This approach led to a preference for diplomatic venues and processes that focused on continuing investments in regional architecture, new emphasis on minilateral dialogues such as the Indian Ocean Rim Association (IORA) and Mexico, Indonesia, Korea, Turkey, and Australia (MIKTA), and more effort directed to bilateral and plurilateral processes such as the Trans-Pacific Partnership trade negotiations. This approach has been continued under Prime Minister Turnbull, with a renewed focus on innovation. Part 1 considers minilateral and regional investments in the Indo-Pacific region, primarily, IORA, the Asia-Pacific Economic Cooperation (APEC), and the Association of South East Asian Nations (ASEAN). I consider MIKTA a unique vehicle for Australian diplomacy. Part 2 considers what issues Australia should be pursuing through these forums, with a focus on the two themes of gender equality (as an example of niche diplomacy) and trade (multilateralism under pressure) as case studies. Beeson and Higgott argue that middle powers have the potential to successfully implement “games of skill,” especially at moments of international transition. How skilful have Australia’s efforts been in these minilateral dialogues, enhanced regionalism, and plurilateral processes, and what more can be achieved in these forums? Are these efforts creating more fragmentation of the rules-based order, or are they a way to overcome global governance stalemates? I set out the arguments for whether Australia, as a pivotal power, should generate more global options, or be more focused on inclusion in the Asia-Pacific region.
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Bolland, MDA, AJ Weatherley, and RJ Gilkes. "Residual effectiveness of superphosphate is greater than that of rock phosphate fertilisers for lateritic soils in south-western Australia." Australian Journal of Experimental Agriculture 28, no. 1 (1988): 83. http://dx.doi.org/10.1071/ea9880083.
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The residual values of granular reactive rock phosphate (highly carbonate-substituted apatite from North Carolina, USA.), partially powdered low-reactive Queensland rock phosphate (low carbonate-substituted apatite from the Duchess deposit), and granular triple superphosphate were measured in 3 experiments on different lateritic soils in different climatic regions of south-western Australia (Gibson, South Bodallin, West Dale). Finely powdered calcined crandallite-millisite rock phosphate from Christmas Island (Calciphos) was included in one of the experiments. The fertilisers were applied once only in May 1984 and their residual value measured over 3 years (1984-1986) using yield and phosphorus content of the following species each year: experiment 1 (Gibson), barley in years 1 and 2 and oats in the third year; experiment 2 (South Bodallin), triticale in all 3 years; experiment 3 (West Dale), subterranean clover in years I and 2 followed by oats in year 3. Relative to triple superphosphate (TSP) applied each year, the effectiveness of superphosphate in year 1 (year of application) in the experiment at Gibson decreased by about 40% between years 1 and 2, and by a further 5% between years 2 and 3. The corresponding values for the experiment at South Bodallin were 75% and 5%, and at West Dale 50% and 25%. All rock phosphates were much less effective than TSP in year 1, being 5-30% as effective as TSP. Effectiveness of rock phosphates remained low over the 3 years, being 5-20% as effective as newly applied TSP. Although the effectiveness of TSP decreased, it continued to be 50% as effective as newly applied TSP after 3 years. Residual TSP and both freshly applied and residual rock phosphates did not support the same maximum yield as freshly applied TSP despite well defined yield plateaux being obtained in each case. At each harvest, the relationship between yield and phosphorus content of plants was similar for all fertilisers so that the smaller maximum DM and grain yield and reduced effectiveness of the rock phosphates were largely due to less phosphorus being taken up by plants.
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Eagles, H. A., Robyn McLean, R. F. Eastwood, M. J. Appelbee, Karen Cane, P. J. Martin, and H. Wallwork. "High-yielding lines of wheat carrying Gpc-B1 adapted to Mediterranean-type environments of the south and west of Australia." Crop and Pasture Science 65, no. 9 (2014): 854. http://dx.doi.org/10.1071/cp14106.
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The Gpc-B1 gene from wild emmer has been proposed as a potential mechanism for improving grain protein in bread wheat without reducing grain yield. Near-isolines with and without the Gpc-B1 gene in three Australian-adapted genetic backgrounds, Gladius, Wyalkatchem and VR1128, were compared in 14 experiments across the south and west of Australia for grain yield, grain protein content and grain weight. The donor parents of Gpc-B1 were the Canadian cultivars Burnside and Somerset. One of the 14 experiments was discarded because of inadequate rust control and confounding effects of Yr36, a gene closely linked to Gpc-B1. Heading date and test weight were measured in five experiments. Across all comparisons, Gpc-B1 increased grain protein content and reduced grain weight, with a negligible effect on grain yield. Selected lines containing Gpc-B1 in a Wyalkatchem background had comparable grain yields to the elite cultivar Mace, but with significantly higher grain protein contents, slightly higher grain weights, similar heading dates and acceptable test weights. The development of agronomically acceptable lines containing Gpc-B1 was partially attributed to the removal of undesirable genes from wild emmer during the breeding of the Canadian donor parents and the use of Australian recurrent parents with high test weights.
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Turner, S. R., D. J. Merritt, C. C. Baskin, K. W. Dixon, and J. M. Baskin. "Physical dormancy in seeds of six genera of Australian Rhamnaceae." Seed Science Research 15, no. 1 (March 2005): 51–58. http://dx.doi.org/10.1079/ssr2004197.
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Physical dormancy (PY) was identified in six genera representative of Australian Rhamnaceae and subsequently was broken, based on identification of key seed dormancy characteristics: (1) isolation and classification of embryo features; (2) imbibition experiments to determine the rate and amount of water uptake in seeds; and (3) determination of optimum temperature regimes for germination. All six species had relatively large spatulate embryos. Imbibition studies showed all species possessed PY (i.e. a water-impervious seed coat) that was broken by a hot-water treatment. Alleviation of PY resulted in high germination (<70%) at 7/18°C, temperatures similar to winter in south-west Western Australia. Germination was suppressed at higher temperatures and in the presence of light. The study adds information to our knowledge of seed dormancy in Australian Rhamnaceae, and highlights the benefits of understanding dormancy states in seeds prior to evaluating dormancy-release mechanisms on wild species used in restoration ecology and horticulture.
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Mitchell, M. L., J. M. Virgona, J. L. Jacobs, and D. R. Kemp. "Population biology of Microlaena stipoides in a south-eastern Australian pasture." Crop and Pasture Science 65, no. 8 (2014): 767. http://dx.doi.org/10.1071/cp13404.
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Microlaena (Microlaena stipoides var. stipoides (Labill.) R.Br.) is a C3 perennial grass that is native to areas of south-eastern Australia. In this region, perennial grasses are important for the grazing industries because of their extended growing season and persistence over several years. This series of experiments focused on the population biology of Microlaena by studying the phenology (when seed was set), seed rain (how much seed was produced and where it fell), seed germination, germinable seedbank, seed predation and seedling recruitment in a pasture. Experiments were conducted at Chiltern, in north-eastern Victoria, on an existing native grass pasture dominated by Microlaena. Seed yields were substantial (mean 800 seeds m–2), with seed rain occurring over December–May. Microlaena has two distinct periods of high seed rain, in early summer and in early autumn. Seed predation is high. Within a 24-h period during peak seed production, up to 30% of Microlaena seed was removed from a pasture, primarily by ants. Microlaena seedlings recruited throughout an open paddock; however, seedling density was low (5 seedlings m–2). Microlaena represented only low numbers in the seedbank (0.01–0.05% of total); hence, any seedlings of Microlaena that germinate from the seedbank would face immense competition from other species. Management strategies for Microlaena-dominant pastures need to focus on the maintenance of existing plants.
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Sun, Baichun, Andrej Bona, Binzhong Zhou, Andrew King, Christian Dupuis, and Roman Pevzner. "Seismic while drilling experiment with diamond drilling at Brukunga, South Australia." ASEG Extended Abstracts 2013, no. 1 (December 2013): 1–4. http://dx.doi.org/10.1071/aseg2013ab045.
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Sha, W., W. Physick, and W. Grace. "A numerical experiment on the Adelaide Gully Wind of South Australia." Mathematical and Computer Modelling 21, no. 9 (May 1995): 119–23. http://dx.doi.org/10.1016/0895-7177(95)00060-f.
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Doyle, PT, RA Love, and TW Plaisted. "Mineral supplementation and wool production of young Merino sheep on the south coast of Western Australia." Australian Journal of Experimental Agriculture 35, no. 4 (1995): 437. http://dx.doi.org/10.1071/ea9950437.
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Wool-free liveweight change (LWC), wool growth rate, annual wool production, and wool characteristics of young Merino wethers fed supplements of lupins with gypsum or a multi-element mineral lick were examined in 12 experiments at 5 farms between 1989 and 1992. The source of sheep varied between experiments; age was 4.5-6.5 months and liveweight 28-37 kg at the beginning of supplementation. Sheep were fed lupins, lupins coated with gypsum (15-20 g/kg lupins), or lupins along with access to the mineral lick (offered at 140 g/sheep.week). The amount of lupins offered in all treatments within any experiment was the same. Supplementary feeding varied between experiments from 150 to 240 days. The sheep grazed annual pastures at stocking rates of 8-1 6.7ha. Average lick intake was 12-18 g/sheep. day. During supplementary feeding, there was considerable variation in LWC (-80 to +110 g/day) and clean wool growth rates (3.8-15.1 g/day) within and between experiments. However, there was no significant positive effect of gypsum or mineral lick supplementation on LWC or clean wool growth rates during or after supplementary feeding in any experiment. There were positive (P<0.01) relationships between LWC and clean wool growth rates during supplementation. Also, for some spring-shorn sheep types, staple strength of wool was linearly related (P<0.01) to LWC in the period before the position of break in the wool staple. Annual wool production, average fibre diameter, and staple strength of midside wool were not significantly increased by supplements of gypsum or mineral lick in any experiment.
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Norton, M. R., M. L. Mitchell, E. Kobelt, and E. Hall. "Evaluation of native and introduced grasses for low-input pastures in temperate Australia: experimental approach, site and genotype descriptions." Rangeland Journal 27, no. 1 (2005): 11. http://dx.doi.org/10.1071/rj05002.
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This paper describes the experimental methodology, sites, seasonal conditions and germplasm used in the Australian Native and Low Input Grass Network (NLIGN). In 1998, eight sites were established across the temperate pastoral zone of southern Australia. These were located at Armidale, Binya, Sutton and Trangie in NSW; Springhurst in Victoria; Jericho in Tasmania; Flaxley in South Australie and Kendenup in Western Australia. A total of 62 lines were evaluated, of which, 29 were Australian native grasses and 33 were introduced. With differences in seed size among species and a lack of information on dormancy and germination characteristics of the native plants, seedlings were transplanted into the field on weed-mat as spaced plants. Lines were compared over a 3-year period from 1998 to 2001. Methods used for determination of forage production, persistence and palatability are described. Information detailing the original collection sites of the germplasm, a list of NLIGN sites where each genotype was evaluated, as well as a detailed description of sites and seasonal conditions is also presented.
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Penrose, LDJ, M. Mosaad, TS Payne, G. Ortiz-Ferrara, and HJ Braun. "Comparison of controls on development in breeding lines from Australian and CIMMYT/ICARDA winter and facultative wheat breeding programs." Australian Journal of Agricultural Research 47, no. 1 (1996): 1. http://dx.doi.org/10.1071/ar9960001.
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This study sought to compare developmental controls in breeding a within two winter wheat improvement programs, one Australian and a CIMMYT/ICARDA program based in West Asia. Developmental controls considered were intrinsic earliness, and responses to photoperiod and to vernalization. The reliability with which each control on development had been measured was tested in separate experiments using the wheats utilized in the Australian program. Measures of intrinsic earliness showed significant agreement between experiments, better agreement being found for response to photoperiod and between integrated response to vernalization and time to double ridge after late summer sowings. The wheats utilized in the CIMMYTI/CARDA programs were found to be quick in intrinsic earliness, and to possess little response to photoperiod. While these controls varied more for the wheats utilized in the Australian program, commercial Australian winter wheats were similar to the CIMMYTI/CARDA lines. Lines utilized by both programs were represented by types with spring, facultative and winter habit. The clearest differences between programs were that CIMMYTI/CARDA winter wheats appeared to have much stronger response to vernalization than the Australian winter wheats. These findings suggest breeders would find a good proportion of segregates, from crosses between the Australian and the CIMMYTI/CARDA winter wheats, to be developmentally adapted to south-central New South Wales. This suggests CIMMYTI/CARDA winter wheats provide a matching pool from which to access germplasm to introduce new characters into Australian winter wheats.
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LinHo, L. H., Xianglei Huang, and Ngar-Cheung Lau. "Winter-to-Spring Transition in East Asia: A Planetary-Scale Perspective of the South China Spring Rain Onset." Journal of Climate 21, no. 13 (July 1, 2008): 3081–96. http://dx.doi.org/10.1175/2007jcli1611.1.
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Abstract Analysis of observations from 1979 to 2002 shows that the seasonal transition from winter to spring in East Asia is marked with a distinctive event—the onset of the south China spring rain (SCSR). In late February, the reduced thermal contrast between ocean and land leads to weakening of the Asian winter monsoon as well as the Siberian high and the Aleutian low. Meanwhile, convection over Australia and the western Pacific Maritime Continent is suppressed on the passage of the dry phase of a Madden–Julian oscillation (MJO). In conjunction with the seasonal march of monsoon circulation in the Indonesian–Australian sector, this MJO passage weakens the local thermally direct cell in the East Asia–Australia sector. This development is further accompanied by a series of adjustments in both the tropics and midlatitudes. These changes include attenuation of the planetary stationary wave, considerable weakening of the westerly jet stream over much of the central Pacific adjacent to Japan, and reduction of baroclinicity near the East Asian trough. The influence of concurrent local processes in midlatitudes on the SCSR onset is also important. The weakened jet stream is associated with confinement of frontal activities to the coastal regions of East Asia as well as with rapid expansion of the subtropical Pacific high from the eastern Pacific to the western Pacific. A parallel analysis using output from an experiment with a GFDL-coupled GCM shows that the above sequence of circulation changes is well simulated in that model.
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Lobert, Bertram, Lindy Lumsden, Hans Brunner, and Barbara Triggs. "An assessment of the accuracy and reliability of hair identification of south-east Australian mammals." Wildlife Research 28, no. 6 (2001): 637. http://dx.doi.org/10.1071/wr00124.
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The aim of this experiment was to quantify the accuracy and reliability of identifying mammals from hair samples, using two highly skilled practitioners. Hair samples were collected from 37 mammal species occurring in south-eastern Australia. This material was divided into 252 samples, which were then used in a blind test to determine the accuracy of the technique. The taxa were then grouped into reliability categories based on the accuracy and consistency of the practitioner’s identifications. In all, 23 taxa, including 19 species, were regarded as being reliably identified from hair analysis. Identification of the remaining 18 species involved at least some level of error. Several factors influenced the accuracy of identifications in this study, principally (1) the need to identify samples to species level wherever possible, rather than not making an identification, and (2) the diverse range of species used (from across Victoria) and the lack of collection locality. Target species have been grouped into reliability categories, as a guide to aid evaluation of field-derived data. We emphasise the need for practitioners to gain considerable personal experience of the technique, the diagnostic characteristics used to identify hair of different species and intra-specific variation, in order to maximise the reliability of identification results.
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Gerwin, Melissa R., Rose Brinkhoff, Travis Britton, Meagan Porter, Ruth K. Mallett, and Mark J. Hovenden. "Testing the impact of community composition on the productivity of a cool temperate eucalypt forest: the Australian Forest Evenness Experiment (AFEX)." Australian Journal of Botany 68, no. 4 (2020): 310. http://dx.doi.org/10.1071/bt19131.
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Understanding the factors controlling productivity is crucial for modelling current and predicting future forest growth and carbon sequestration potential. Although abiotic conditions exert a strong influence on productivity, it is becoming increasingly evident that plant community composition can dramatically influence ecosystem processes. However, much of our understanding of these processes in forests comes from correlative studies or field experiments in short-statured, short-lived vegetation. Here, we present the background, design and implementation success of the Australian Forest Evenness Experiment (AFEX), which was designed to investigate the influence of community composition on the processes that contribute to forest productivity. Eighty 25 × 25-m plots, covering 5 ha in a logged, burnt forest coupe in south-eastern Tasmania were sown with four tree species, namely Eucalyptus delegatensis R.T.Baker, E. regnans F.Muell., Acacia dealbata Link and Pomaderris apetala Labill., in varying combinations to provide a range of evenness levels with each of the four species as target dominant. Despite some differences between sown composition and realised composition 1year after sowing, a substantial range of community evenness and local neighbourhood densities and compositions existed in the experiment. Thus, this site provides a unique opportunity to determine the influence of local neighbourhood composition on a range of ecological processes.
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Ponder, WF, and GA Clark. "A Morphological and Electrophoretic Examination of Hydrobia Buccinoides, a Variable Brackish-Water Gastropod From Temperate Australia (Mollusca, Hydrobiidae)." Australian Journal of Zoology 36, no. 6 (1988): 661. http://dx.doi.org/10.1071/zo9880661.
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The morphology of the abundant brackish-water hydrobiid snail known as 'Hydrobia buccinoides' is described. A new genus, Ascorhis, is provided for it and the valid species name for the southern (South Australia, Victoria, Tasmania) and eastern (New South Wales, Queensland) populations is shown to be victoriae T. Woods. The species name buccinoides is based on Assiminea tasmanica and is an earlier name for that species. Morphological and allozyme differences indicate that the Western Australian populations should be distinguished as a separate species and a new name (A. occidua) is provided for these. Both species show a considerable intrapopulation variation in shell sculpture. Salinity tolerance experiments on three Sydney populations indicate that Ascorhis victoriae tolerates a wide range of salinities, the middle of the preferred range being about that of normal seawater.
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Burns, J. P. A., M. J. Meyler, P. Tiernan, and A. J. Fischer. "The South Australian Wine Grape Market: An Analysis Using Experimental Economics Techniques." European Journal of Marketing 23, no. 9 (September 1989): 15–26. http://dx.doi.org/10.1108/eum0000000000587.
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Mackay, Duncan A., and Molly A. Whalen. "An experimental study of the pollination biology of the perennial halophyte Frankenia pauciflora var. gunnii (Frankeniaceae) in a South Australian salt marsh." Australian Journal of Botany 57, no. 1 (2009): 31. http://dx.doi.org/10.1071/bt08153.
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Relatively little is known about the pollination biology or breeding systems of entomophilous plant species in salt-marsh habitats. In the present study, the pollination biology of the perennial halophyte Frankenia pauciflora DC. var. gunnii Summerh. (Frankeniaceae) was investigated in a salt marsh near Goolwa, South Australia. The flowering peak of this species occurs in summer and flowers are visited by a diverse array of insects in the Diptera, Hymenoptera and Lepidoptera. An experiment was performed to test for the presence of pollen limitation in the field. Flowers to which outcross pollen was added produced significantly more fruits and significantly more seeds per fruit than did unmanipulated control flowers. Average seed weight per fruit did not differ significantly between control and pollen-addition flowers. In glasshouse experiments, flowers to which cross-pollen was added produced significantly more fruit than did flowers to which self-pollen was added, suggesting the presence of a facultatively xenogamous breeding system.
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Langworthy, Adam D., Richard P. Rawnsley, Mark J. Freeman, Keith G. Pembleton, Ross Corkrey, Matthew T. Harrison, Peter A. Lane, and David A. Henry. "Potential of summer-active temperate (C3) perennial forages to mitigate the detrimental effects of supraoptimal temperatures on summer home-grown feed production in south-eastern Australian dairying regions." Crop and Pasture Science 69, no. 8 (2018): 808. http://dx.doi.org/10.1071/cp17291.
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In many south-eastern Australian dairying regions, supraoptimal ambient temperatures (Ta > 30°C) often challenge the perennial ryegrass (Lolium perenne L.)-dominated feed-base during the summer months. A glasshouse experiment was undertaken to identify alternative summer-active temperate (C3) perennial forages more tolerant of supraoptimal temperature stress (day/night Ta of 38/25°C) than perennial ryegrass. Supraoptimal temperature stress was imposed both with and without irrigation. Chicory (Cichorium intybus L.) was the only species to survive 18 days of combined supraoptimal temperature stress and non-irrigation. Lucerne (Medicago sativa L.), plantain (Plantago lanceolata L.), and tall fescue (Festuca arundinacea Schreb.) survived 12 days of this treatment. Twelve days of exposure to these conditions caused death of perennial ryegrass, prairie grass (Bromus catharticus Vahl.), cocksfoot (Dactylis glomerata L.), birdsfoot trefoil (Lotus corniculatus L.), and red clover (Trifolium pratense L.). Irrigation (daily to through drainage) mitigated detrimental effects of imposed supraoptimal temperature stress on the growth and survival of all species. Chicory and to a lesser extent lucerne, plantain, and tall fescue may have a role to play in south-eastern Australian dairying regions, where supraoptimal temperature stress is a frequent and ongoing issue.
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Evans, J. P., F. Ji, C. Lee, P. Smith, D. Argüeso, and L. Fita. "Design of a regional climate modelling projection ensemble experiment – NARCliM." Geoscientific Model Development 7, no. 2 (April 16, 2014): 621–29. http://dx.doi.org/10.5194/gmd-7-621-2014.
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Abstract. Including the impacts of climate change in decision making and planning processes is a challenge facing many regional governments including the New South Wales (NSW) and Australian Capital Territory (ACT) governments in Australia. NARCliM (NSW/ACT Regional Climate Modelling project) is a regional climate modelling project that aims to provide a comprehensive and consistent set of climate projections that can be used by all relevant government departments when considering climate change. To maximise end user engagement and ensure outputs are relevant to the planning process, a series of stakeholder workshops were run to define key aspects of the model experiment including spatial resolution, time slices, and output variables. As with all such experiments, practical considerations limit the number of ensemble members that can be simulated such that choices must be made concerning which global climate models (GCMs) to downscale from, and which regional climate models (RCMs) to downscale with. Here a methodology for making these choices is proposed that aims to sample the uncertainty in both GCM and RCM ensembles, as well as spanning the range of future climate projections present in the GCM ensemble. The RCM selection process uses performance evaluation metrics to eliminate poor performing models from consideration, followed by explicit consideration of model independence in order to retain as much information as possible in a small model subset. In addition to these two steps the GCM selection process also considers the future change in temperature and precipitation projected by each GCM. The final GCM selection is based on a subjective consideration of the GCM independence and future change. The created ensemble provides a more robust view of future regional climate changes. Future research is required to determine objective criteria that could replace the subjective aspects of the selection process.
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Bolan, NS, RE White, and MJ Hedley. "A review of the use of phosphate rocks as fertilizers for direct application in Australia and New Zealand." Australian Journal of Experimental Agriculture 30, no. 2 (1990): 297. http://dx.doi.org/10.1071/ea9900297.
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Field trials in New Zealand have shown that reactive phosphate rocks (RPRs) can be as effective as soluble P fertilisers, per kg of P applied, on permanent pastures that have a soil pH<6.0 (in water) and a mean annual rainfall >800 mm. Whereas RPRs such as North Carolina, Sechura, Gafsa and Chatham Rise have been evaluated on permanent pastures in New Zealand, most Australian field trials have examined unreactive PRs such as Christmas Island A and C grade, Nauru and Duchess, using annual plant species. Only in recent experiments has an RPR, North Carolina, been examined. Except on the highly leached sands in southern and south-western Australia, both reactive and unreactive PRs have shown a low effectiveness relative to superphosphate. In addition to chemical reactivity, other factors may contribute to the difference in the observed agronomic effectiveness of PRs in Australia and New Zealand. Generally, PRs have been evaluated on soils of lower pH, higher pH buffering capacity (as measured by titratable acidity) and higher P status in New Zealand than in Australia. Rainfall is more evenly distributed throughout the year on New Zealand pastures than in Australia where the soil surface dries out between rainfall events. Dry conditions reduce the rate at which soil acid diffuses to a PR granule and dissolution products diffuse away. Even when pH and soil moisture are favourable, the release of P from PR is slow and more suited to permanent pasture (i.e. the conditions usually used to evaluate PRs in New Zealand) than to the annual pastures or crops used in most Australian trials. Based on the criteria of soil pH<6.0 and mean annual rainfall >800 mm, it is estimated that the potentially suitable area for RPRs on pasture in New Zealand is about 8 million ha. Extending this analysis to Australia, but excluding the seasonal rainfall areas of northern and south-western Australia, the potentially suitable area is about 13 million ha. In New Zealand, many of the soils in the North and South Islands satisfy both the pH and rainfall criteria. However, suitable areas in Australia are confined mainly to the coastal and tableland areas of New South Wales and eastern Victoria, and within these areas the actual effectiveness of RPR will depend markedly on soil management and the distribution of annual rainfall. Further research on RPR use should be focused on these areas.
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Baldock, JA, M. Aoyama, JM Oades, o. Susant, and CD Grant. "Structural amelioration of a South Australian red-brown earth using calcium and organic amendments." Soil Research 32, no. 3 (1994): 571. http://dx.doi.org/10.1071/sr9940571.
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The ability of wheat straw, gypsum and agricultural lime to ameliorate the unstable structural condition of a degraded red-brown earth located at the Waite Agricultural Research Institute, South Australia, was investigated in a field experiment lasting 5 years. Wheat straw was added at rates of 0, 5 and 10 t ha-1 y-1, and gypsum and agricultural lime were added at rates of 3.4 and 2.0 t ha-1 y-1 respectively. Most of the measurements were taken on samples collected after three and four consecutive years of treatment applications, but some were taken one year after the fifth and final application of the treatments. The amount of water-stable macroaggregation in the top 10 cm increased with increasing rate of wheat straw application. Addition of agricultural lime incorporated with straw temporarily increased macroaggregate stability to a greater extent than was observed with either amendment alone. The proportion of the soil surface occupied by macropores was also increased significantly by addition of agricultural lime, and this was attributed to a stimulation of biological activity in the soil due to the increased soil pH. Density fractionation of the soil suggested the turnover of the added wheat straw in the lime-treated soil was greater than in the gypsum-treated and control soils. Addition of gypsum decreased the content of mechanically dispersible clay by modifying the electrolyte concentration and composition, but was unable to completely resist the dispersive tendencies created by the decomposing organic residues. The high rates of wheat straw incorporated in the top 10 cm caused significant dispersion in the top 20 cm, which was thought to have mobilized clay particles causing them to move downward, resulting in pore blockage and the consequent lowering of hydraulic conductivity in the zone immediately below.
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Giunipero, Emma M., and Allan J. Clarke. "Estimation of the Effect of Eddies on Coastal El Niño Flows Using Along-Track Satellite Altimeter Data." Journal of Physical Oceanography 43, no. 6 (June 1, 2013): 1209–24. http://dx.doi.org/10.1175/jpo-d-12-0109.1.
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Abstract Previous work has shown that the El Niño sea level signal leaks through the gappy western equatorial Pacific to the coasts of western and southern Australia. South of about 22°S, in the region of the Leeuwin Current, the amplitude of this El Niño signal falls. Using coastal sea level measurements and along-track altimetry data from the Ocean Topography Experiment (TOPEX)/Poseidon, Jason-1, and OSTM/Jason-2 satellites, this study finds that the interannual divergence of the eddy momentum flux D′ is correlated with the southward along-shelf sea level amplitude decay, consistent with the eddies removing energy from the large-scale sea level signal. The quantity D′ is also correlated with the interannual flow with a surprisingly short dissipation time scale of only 2 days, much shorter than the interannual time scale. A similar analysis off the western coast of South America, site of the originally named “El Niño” current, was carried out. Interannual sea level decay along the shelf edge is observed, and the interannual southward flow along the shelf edge is found to be highly positively correlated with the along-shelf sea level decay with a dissipation time scale of a few days. Dynamics similar to the Australian case likely apply.
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Fairclough, D. V., W. F. Dimmlich, and I. C. Potter. "Length and age compositions and growth rates of the Australian herring Arripis georgiana in different regions." Marine and Freshwater Research 51, no. 6 (2000): 631. http://dx.doi.org/10.1071/mf99118.
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Arripis georgiana was collected from coastal waters in Western Australia and South Australia. The opaque zones on the otoliths were shown to be formed annually and thus their number could be used to age the individuals of this species. Although the catches of A. georgiana in south-western Australia, where spawning occurs, were dominated by the 0+ to 5+ age classes, they did contain females and males up to ten and nine years old, respectively. The von Bertalanffy growth parameters for the two sexes in this region differed significantly, with the asymptotic length (L∞) being significantly greater for females (262 mm) than for males (239 mm), whereas the reverse was true for the growth coefficient (k), i.e. 0.813 v. 0.992. The catches of A. georgiana eastwards of 121˚44′E on the south coast of Western Australia, where spawning does not occur, were dominated by the 0+ to 2+ age classes. The above data, when taken in conjunction with earlier tagging experiments and the marked decline that occurs in the number of 2+ fish in South Australia in summer, imply that, during this period, many two-year-old individuals of A. georgiana start migrating towards their spawning areas in south-western Australia.
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O'Brien, RG, and MP Weinert. "Three metalaxyl sensitivity levels in Australian isolates of Pseudoperonospora cubensis (Berk. et Curt.) Rost." Australian Journal of Experimental Agriculture 35, no. 4 (1995): 543. http://dx.doi.org/10.1071/ea9950543.
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Isolates of Pseudoperonospora cubensis from the Murrumbidgee Irrigation Area (MIA), New South Wales, and the Burdekin district, Queensland, were compared for metalaxyl sensitivity with a known sensitive isolate. Several different fungicide application techniques were used (foliar sprays, soil drenches, floating leaf discs), but the relativity of metalaxyl sensitivity between isolates was maintained. Isolates from the Burdekin district were highly resistant and came from fields where control of downy mildew was poor. Isolates from the MIA showed intermediate sensitivity but there was no apparent loss of field control. In a floating disc experiment the EC50 values of sensitive, intermediate, and resistant isolates were in the ranges >0.01-<0.1, >1-<10, and >100 �g metalaxyl/mL, respectively.
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Fillery, IR, and KJ McInnes. "Components of the fertiliser nitrogen balance for wheat production on duplex soils." Australian Journal of Experimental Agriculture 32, no. 7 (1992): 887. http://dx.doi.org/10.1071/ea9920887.
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In this paper, we review literature on the fate of fertiliser nitrogen (N) applied to duplex soils in wheat-growing regions of southern Australia, and discuss the contribution of specific N transformations to N loss. Duplex soils are characterised by the presence of soil material, within the rooting depth of crops, that possess hydraulic conductivities that are lower than those of overlying material. Denitrification and the transport of nitrate below rooting depth of crops are thought to be the chief causes of loss of fertiliser N and to contribute to poor grain yields. Ammonia volatilisation could contribute also to N loss. The fate of fertiliser N commonly applied to wheat in southern Australia has largely been evaluated using budgeting procedures using l5N, a stable isotope of N. Results from studies in south-eastem Australia, using red-brown earths, indicate that between 10 and 40% of applied 15N can be lost irrespective of time of application to wheat. Denitrification is believed to be the chief cause of loss of l5N. Similar studies on yellow duplex soils in Western Australia have shown fertiliser N loss to range from 70% to no loss of the l5N applied. The exact cause of N loss in Western Australian studies is unclear. There was circumstantial evidence for ammonia loss from surface-applied urea, and evidence of leaching of nitrates from this and other ammoniumbased fertilisers. The role of denitrification has not been clarified in Western Australian studies. In the majority of studies, recovery of 15N in aboveground biomass exceeded 40% of that applied. In addition, between 17 and 48% of applied 15N, of which 10-15% may be in root material, has been recovered in the soil organic matter pool. The predominance of the denitrification process in south-eastern Australian soils, and the inability to improve the efficiency of utilisation of 15N by delaying the time of application to wheat underscores the importance of controlling the nitrification process using inhibitors. Management options for Western Australian soils are less clear. Some agronomic experiments have demonstrated the advantage of delaying the application of fertiliser N to wheat to improve the efficiency of its utilisation. There is also evidence which suggests that N should be applied early in the growth cycle to promote tiller development and thereby increase the potential for grain yield.
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Chamalaun, F. H. "Geomagnetic deep sounding experiment in the central Flinders Ranges of South Australia." Physics of the Earth and Planetary Interiors 37, no. 2-3 (February 1985): 174–82. http://dx.doi.org/10.1016/0031-9201(85)90050-0.
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Thomson, Jody, and Bronwyn Davies. "Becoming With Art Differently: Entangling Matter, Thought and Love." Cultural Studies ↔ Critical Methodologies 19, no. 6 (February 14, 2019): 399–408. http://dx.doi.org/10.1177/1532708619830123.
Full textAbstract:
In this article, we put new materialist concepts to work in an experiment in thinking-with-matter. We write our way into an encounter with two artworks by Australian French Impressionist John Russell, hanging in an exhibition space at the Art Gallery of New South Wales. In being-with and becoming-with the pictures, we go off the beaten track, not concerning ourselves with aesthetics, critique, meaning-making, or sociocultural conventions. We begin with W. J. T. Mitchell’s question what do pictures want? We extend his question, drawing on new materialist philosophers, to explore what is made possible when the matter of paint-on-canvas is encountered, not as inert, but as lively, affective, and intra-active. Our experiment moves to what happens in between ourselves as human subjects and the more-than-human matter of these works of art.
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Kus, B., Jaya Kandasamy, S. Vigneswaran, H. K. Shon, and G. Moody. "Gravity driven membrane filtration system to improve the water quality in rainwater tanks." Water Supply 13, no. 2 (March 1, 2013): 479–85. http://dx.doi.org/10.2166/ws.2013.046.
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The characterisation of rainwater in metropolitan Sydney and in rural New South Wales was undertaken. The results showed that factors such as the lack of vehicular traffic, air pollution and urban contamination meant that rural rainwater water quality was better. The rain water collected in both metropolitan and rural areas generally complied with the 2004 Australian Drinking Water Guidelines except for parameters such as the pH in both the metropolitan and rural rainwater tanks and the turbidity, and lead levels from the metropolitan tanks. This paper also reports the results of a laboratory and a pilot scale study with a deep bed filter (granular activated carbon, GAC) and microfiltration (MF) hollow fibre membrane filter system used to treat raw rainwater collected from a metropolitan rainwater tank. The results of the laboratory experiment and pilot scale systems focus on the non-compliant parameters of the sampling program, i.e. turbidity, lead and dissolved organic carbon (DOC). It was found that rainwater treated by the GAC filter removed the majority of the turbidity and organic substances. The treatment system reduced the concentration of turbidity, lead and DOC to below the Australian Drinking Water Guidelines limits. The pilot plant experiment demonstrated that a GAC filter system and gravity driven membrane could result in low cost and low maintenance operation.
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Gray, Friday, Anne Cochrane, and Pieter Poot. "Provenance modulates sensitivity of stored seeds of the Australian native grass Neurachne alopecuroidea to temperature and moisture availability." Australian Journal of Botany 67, no. 2 (2019): 106. http://dx.doi.org/10.1071/bt18240.
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In the present study we assessed the sensitivity of stored seeds of the common grass Neurachne alopecuroidea R.Br. from south-western Australian sources to varying temperature and moisture conditions as a tool to anticipate potential adaptability of seeds to climate change. We examined among-population germination responses, focusing on germination of excised seeds to overcome possible dormancy imparted by the lemma and palea. We hypothesised that temperature above and below the optimum and low moisture potentials would adversely affect germination, and that conditions for successful germination would be associated with the local climate at each seed source site. Experiment 1 used a bi-directional temperature gradient plate to measure responses to constant and alternating temperatures (5–40°C). Experiment 2 examined responses to moisture availability using polyethylene glycol (PEG 8000) solutions at different temperatures. Temperature optima varied among populations with significant reductions in germination occurring only below 15°C. Germination speed and success declined with decreasing moisture availability, with greater impact at higher temperatures. Significant population variation was observed. Tolerance to temperature and moisture availability was higher than expected and some of this variation suggests adaptation to local climates across the species Western Australian distribution. We discuss these results in the context of seed use in restoration and global warming.
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Dalton, S. J., S. Godwin, S. D. A. Smith, and L. Pereg. "Australian subtropical white syndrome: a transmissible, temperature-dependent coral disease." Marine and Freshwater Research 61, no. 3 (2010): 342. http://dx.doi.org/10.1071/mf09060.
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Since 2000, a disease displaying white-syndrome characteristics has been observed affecting corals from the genus Turbinaria in the Solitary Islands Marine Park, New South Wales, Australia. Recently termed Australian subtropical white syndrome, this disease is transmissible through direct contact and by a predatory vector, but transmission through the water column has not been observed. In aquarium experiments, progressive tissue loss, extending from the region where healthy Turbinaria mesenterina fragments were in direct contact with samples of diseased coral, was noted in 66% of treatments. No tissue loss occurred in any of the controls or when healthy fragments were not in direct contact with diseased corals. Field experiments confirmed that the disease was infectious through direct contact. Further experiments showed that the rate of tissue loss was significantly higher when corals were exposed to summer temperatures (26°C). These results suggest that temperature increases predicted in most climate change models could lead to the loss of dominant coral species, displacing other organisms that rely on corals for food and shelter. Finally, the present study showed that removal of the disease margin provides a management tool to minimise coral tissue loss during an epizootic.