Bibliografie tematiche / Southwestern Australia

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Letteratura scientifica selezionata sul tema "Southwestern Australia"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 26 gennaio 2023

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Articoli di riviste sul tema "Southwestern Australia"

McComb, A. J., e J. A. Davis. "Eutrophic waters of southwestern Australia". Fertilizer Research 36, n. 2 (1993): 105–14. http://dx.doi.org/10.1007/bf00747580.

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Bentley, Alison R., John F. Leslie, Edward C. Y. Liew, Lester W. Burgess e Brett A. Summerell. "Genetic Structure of Fusarium pseudograminearum Populations from the Australian Grain Belt". Phytopathology® 98, n. 2 (febbraio 2008): 250–55. http://dx.doi.org/10.1094/phyto-98-2-0250.

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Crown rot, caused by the fungus Fusarium pseudograminearum (teleomorph Gibberella coronicola) is a major disease of wheat in the Australian grain belt. However, there is little information available on the population structure of this pathogen. We measured genetic diversity as assessed with amplified fragment length polymorphism (AFLP) analysis within and between populations of F. pseudograminearum from northeastern, south central, and southwestern regions of the Australian grain belt. Amongst the 217 isolates, 176 haplotypes were identified and grouped into two main clusters. One cluster contained isolates from populations in northeastern Australia, and the other cluster contained isolates from populations in south central and southwestern Australia. The southern populations were distinguished from the northeastern populations by higher levels of population differentiation (Gst) between them and genetic identity amongst the regional populations. We hypothesize that the F. pseudograminearum populations from northeastern and southern Australia are independent, which could result from different founding events or from geographic isolation and the accumulation of genetic differences due to genetic drift and/or selection.

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CURRIE, DOUGLAS C., DOUGLAS A. CRAIG e JOHN K. MOULTON. "A new genus, Protaustrosimulium, for four species of Australian black flies (Diptera: Simuliidae)". Zootaxa 4521, n. 3 (14 novembre 2018): 301. http://dx.doi.org/10.11646/zootaxa.4521.3.1.

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Protaustrosimulium n. gen. is described for four species: two previously named species from southeastern Australia—Paracnephia pilfreyi (Davies & Györkös 1988) and Paracnephia terebrans (Tonnoir 1925)—plus two newly described ones from the southwestern-most corner of Western Australia—Prot. amphorum n. sp. and Prot. opscurum n. sp. Molecular and morphological data suggest a close relationship between members of the new genus and Austrosimulium Tonnoir 1925. Monophyly of Protaustrosimulium is supported mainly by characters of adult females, as two of the four species are known only in that life stage. Two species groups are recognized: the pilfreyi-group for Prot. pilfreyi and Prot. amphorum, and the terebrans-group for Prot. terebrans and Prot. opscurum. The constituent species in each group are distributed vicariously in southeastern and southwestern Australia—a common biogeographical pattern in Australian simuliids.

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Ayvazian, Suzanne G., Trevor P. Bastow, John S. Edmonds, Jason How e Gabrielle B. Nowara. "Stock structure of Australian herring (Arripis georgiana) in southwestern Australia". Fisheries Research 67, n. 1 (marzo 2004): 39–53. http://dx.doi.org/10.1016/j.fishres.2003.08.003.

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Beard, J. S. "Palaeodrainage and the geomorphic evolution of passive margins in Southwestern Australia". Zeitschrift für Geomorphologie 47, n. 3 (26 settembre 2003): 273–88. http://dx.doi.org/10.1127/zfg/47/2003/273.

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Lamont, Byron, e S. W. Connell. "Biogeography of Banksia in southwestern Australia". Journal of Biogeography 23, n. 3 (maggio 1996): 295–309. http://dx.doi.org/10.1046/j.1365-2699.1996.00027.x.

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Travers, A., M. J. Eliot, I. G. Eliot e M. Jendrzejczak. "Sheltered sandy beaches of southwestern Australia". Geological Society, London, Special Publications 346, n. 1 (2010): 23–42. http://dx.doi.org/10.1144/sp346.3.

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AHYONG, SHANE T. "Discovery of the sponge-associated caridean genus Paralebbeus in New Zealand and southeastern Australia: P. pegasus sp. nov. (Crustacea: Decapoda: Thoridae)". Zootaxa 4652, n. 2 (8 agosto 2019): 375–83. http://dx.doi.org/10.11646/zootaxa.4652.2.10.

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Deepwater sampling in New Zealand and southern Australian waters over the past two decades has significantly improved knowledge of all invertebrate groups, including decapod crustaceans. Thorid shrimps of the genus, Paralebbeus Bruce & Chace, 1986 are associated with deepwater hexactinellid sponges, with four species known to date from scattered localities in the southwestern Indian Ocean, northwestern Australia, Southeast Asia and the northwestern Pacific including Japan. Paralebbeus pegasus sp. nov. is described from New Zealand and southeastern Australia, representing the first record of the genus from the temperate southwestern Pacific. The new species of Paralebbeus is unique in the genus for having meral spines on pereopods 3–5. A key to the species of Paralebbeus and global distribution map are provided.

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BEARD, JENNIFER J., FRÉDÉRIC BEAULIEU, WAYNE KNEE e TETSUO GOTOH. "Morphological and molecular analyses of the six-spotted spider mite, Eotetranychus sexmaculatus (Riley) (Tetranychidae)—a pest more widespread than anticipated?" Zoosymposia 22 (30 novembre 2022): 192. http://dx.doi.org/10.11646/zoosymposia.22.1.125.

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A spider mite species initially identified as the six-spotted spider mite, Eotetranychus sexmaculatus (Riley), was recorded defoliating avocado trees, Persea americana Mill. (Lauraceae), in the southwestern parts of Western Australia. However, due to morphological inconsistencies in the descriptions of E. sexmaculatus, it has recently been suggested that these Australian specimens actually represented the native species E. queenslandicus Manson and that E. sexmaculatus was in fact not present in Australia (Seeman et al. 2017).

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HUTCHINSON, PAUL M., e PETER G. ALLSOPP. "Cavonus Sharp, 1875 (Coleoptera: Scarabaeidae: Dynastinae: Pentodontini: Pseudoryctina) in Western Australia with description of a new species and the female of Cavonus sculpturatus Blackburn, 1888". Zootaxa 4852, n. 4 (17 settembre 2020): 449–60. http://dx.doi.org/10.11646/zootaxa.4852.4.3.

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The species of Cavonus Sharp, 1875 (Coleoptera: Scarabaeidae: Dynastinae: Pentodontini: Pseudoryctina) from Western Australia, Australia are revised and Cavonus fovealacus new species is described from southwestern Western Australia. The female attributed to Epironastes nigrisetosus Carne, 1957 is redescribed as the female of Cavonus sculpturatus Blackburn, 1888, as is the male of C. sculpturatus. Cavonus latecavatus Dupuis, 2017, from near Menzies in southwestern Western Australia, is transferred to Carneoryctes Özdikmen, 2009 as Carneoryctes latecavatus (Dupuis), new combination. Habitat descriptions, a distributional map, and revised keys to accommodate the new species are presented.

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Più fonti

Tesi sul tema "Southwestern Australia"

Edwards, Danielle L. "Biogeography and speciation of southwestern Australian frogs". University of Western Australia. School of Animal Biology, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0058.

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[Truncated abstract] Southwestern Australia is a global biodiversity hotspot. The region contains a high number of endemic species, ranging from Gondwanan relicts to more recently evolved plant and animal species. Biogeographic models developed primarily for plants suggest a prominent role of Quaternary climatic fluctuations in the rampant speciation of endemic plants. Those models were not based on explicit spatial analysis of genetic structure, did not estimate divergence dates and may be a poor predictor of patterns in endemic vertebrates. Myobatrachid frogs have featured heavily in the limited investigations of the biogeography of the regions fauna. Myobatrachid frogs are diverse in southwestern Australia, and while we know they have speciated in situ, we know little about the temporal and spatial patterning of speciation events. In order to gain insight into the biogeographic history and potential speciation patterns of Myobatrachid frogs in the southwest I conducted a comparative phylogeography of four frog species spanning three life history strategies. I aimed to: 1) assess the biogeographic history of individual species, 2) determine where patterns of regional diversity exist using a comparative framework, 3) determine whether congruent patterns across species enable the development of explicit biogeographic hypotheses for frogs, and 4) compare patterns of diversity in plants with the models I developed for frogs. I conducted fine-scale intraspecific phylogeographies on four species. ... Geocrinia leai: deep divergences, coincident with late Miocene arid onset, divide this species into western and southeast coastal lineages, with a third only found within the Shannon-Gardner River catchments. Phylogeographic history within each lineage has been shaped by climatic fluctuations from the Pliocene through to the present. Arenophryne shows the first evidence of geological activity in speciation of a Shark Bay endemic. Divergence patterns between the High Rainfall and Southeast Coastal Provinces within C. georgiana are consistent with patterns between Litoria moorei and L. cyclorhynchus and plant biogeographic regions. Subdivision between drainage systems along the southern coast (in M. nichollsi, G. leai and the G. rosea species complex) reflect the relative importance of distinct catchments as refuges during arid maxima, similarly the northern Darling Escarpment is identified as a potential refugium (C. georgiana and G. leai). Divergences in Myobatrachid frogs are far older than those inferred for plants with the late Miocene apparently an important time for speciation of southwestern frogs. Speciation of Myobatrachids broadly relates to the onset of aridity in Australia in the late Miocene, with the exception of earlier/contemporaneous geological activity in Arenophryne. The origins of subsequent intraspecific phylogeographic structure are coincident with subsequent climatic fluctuations and correlated landscape evolution. Divergence within frogs in the forest system may be far older than the Pleistocene models developed for plants because of the heavy reliance on wet systems by relictual frog species persisting in the southwestern corner of Australia.

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Loo, Christopher. "The ecology of naturalised silvergrass (Vulpia) populations in south-western Australia". University of Western Australia. School of Plant Biology, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0093.

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[Truncated abstract] Annual grasses have colonised a diverse range of environments in southern Australia. The “Silvergrasses” of the genus Vulpia are excellent examples being widely distributed, are prevalent weeds of agriculture and have had a long history to naturalise on the continent. Research was undertaken on Vulpia populations to identify if naturalising species have reproductive traits that provide propagules with the best chances of success. Furthermore, research aimed at investigating if these traits vary between species and their populations and how this variability related to the environment. A herbarium and field study was undertaken to establish what Vulpia species occur in SW Australia and to investigate environmental factors affecting their distribution. 169 herbaria specimens was examined and a botanical field survey of 189 sites was carried out in September 1998. Four species occur in the region: V. fasciculata, V. muralis, V. bromoides and two variants of V. myuros (V. myuros var. megalura and V. myuros var. myuros). V. bromoides and V. myuros were introduced early into the region while V. fasciculata and V. muralis more recently. It is plausible that Vulpia invaded the region via early seaport settlements and was spread by agricultural expansion. 96% of field sites contained V. myuros var. myuros, 79% V. myuros var. megalura, 50% V. bromoides, 6% V. fasciculata and 6% contained V. muralis. 90% of sites contained a mix of species and 9% of sites contained pure species stands. V. myuros var. myuros is the most widespread species and dominant form of V. myuros. It is found from high rainfall regions through to arid locations occurring on mostly light textured low fertility soils. V. muralis and V. fasciculata occur infrequently with the former widely dispersed and the later occurring predominantly on sands. V. bromoides occurs extensively in high rainfall regions but rarely extends to locations receiving less than 400-450mm annual rainfall and northward above 30°00’ latitude. It is predominantly on light to loamy textured soils that are fertile and acid. The most common species V. myuros and V. bromoides often coexist within sites but the dominance of one over the other is strongly correlated with growing season length and false break frequency. V. bromoides is positively correlated to growing season length and V. myuros is negatively related. The distribution of Vulpia species is strongly influenced by climate and soils. Variability in distribution is a reflection of the ecological differentiation between species to colonise different environments

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Dolling, Perry. "Lucerne (Medicago sativa) productivity and its effect on the water balance in southern Western Australia". University of Western Australia. Faculty of Natural and Agricultural Sciences, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0108.

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[Truncated abstract] In southern Western Australia the replacement of deep-rooted native vegetation with annual species has resulted in rising water tables and increased salinity due to insufficient water use. The area has a Mediterranean-type climate where rainfall during summer is generally low but variable resulting in limited plant growth. However, if rainfall does occur it potentially can contribute to to the increased water excess or drainage by increasing the soil water content before the main drainage period in winter. The first study investigated factors controlling soil water content changes during the fallow (December to May) in annual farming systems. This was achieved by examining variation in available soil water storage to a depth of 1.0-1.5 m at three sites within 13 seasons. Reasons for the variation were examined using the Agricultural Production Systems Simulator (APSIM). This study also investigated the relationship between soil water content at the end of the fallow period (1 May) and the amount of drainage below 2.5 m by using APSIM coupled to historical weather records at three locations. At the end of the fallow a mean of 24 mm (or 25%) of rainfall during the fallow was retained in the soil. Losses of soil water during the fallow were due to evaporation (mean of 60 mm), transpiration from plant cover (mean of 12 mm) and drainage below the root zone and run off (combined mean of 13 mm). Soil water accumulation during the fallow period had a significant impact on simulated drainage under wheat in the following growing season. Every 1 mm increase in soil wetness at the end of the fallow resulted in a 0.7-1 mm increase in simulated drainage during the growing season. ... Variation in the water excess due to variation in rainfall was greater than the reduction in water excess due to lucerne. This makes the decisions about when to grow lucerne to reduce water excess difficult if livestock enterprises are less profitable than cropping enterprises. The findings of this PhD indicate that lucerne does have a place in Mediterranean-type environments because of its greater water use than current farming practices. However, its use needs to be strategic and the strategy will vary from region to region. For example, in the low rainfall region lucerne sowings need to be matched with high soil water contents and phase length will generally be short (2-3 years). In comparison at high rainfall regions lucerne will need to be grown for longer or combined with other strategies to increase water use.

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Bhatti, Muhammad Ali. "Genetic variation in naturalized wild radish (Raphanus raphanistrum L.) populations in the mediterranean climate of south-western Australia". University of Western Australia. School of Plant Biology, 2004. http://theses.library.uwa.edu.au/adt-WU2005.0012.

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[Truncated abstract] Wild radish (Raphanus raphanistrum L.), an outcrossing annual plant, is one of the most widespread and successful colonising weeds in the Australian wheat belt. It was introduced accidentally during the latter part of the 19th century, apparently independently through the major ports of southern Australia. The widespread success of wild radish, and therefore the likelihood of distinct populations, gives us the opportunity to study the colonizing process with adaptation in annual outbreeding species, and to explore their genetic diversity. The aims of this thesis were to study the genetic diversity of wild radish and to investigate which factors are important in its success. After an initial review of the literature (chapter 2), the thesis describes experiments where genetic variation between and within populations was compared at 55 sites in transects across the wheat belt and high rainfall zones of temperate Western Australia (chapter 3). In chapter 4, variation in life history traits was compared with variation in AFLP molecular markers. The role of seed dormancy in the survival of the species was examined in chapter 5, and variation in the oil content of seeds and their fatty acid composition was examined in chapter 6. Finally, the results were discussed in chapter 7 with special reference to the adaptive value of outcrossing in annual weeds. The results suggest that wild radish has evolved to fit the Australian environment. However, measurement of 14 morphological and phenological characters showed that in most cases within site variation was much greater than that between sites. Most of the variation between sites was associated with geoclusters, a name given to zones of similar environmental conditions in regard to rainfall and temperature. Thus plants from areas with high rainfall and low temperature produced longer, wider pods with more segments, heavier seeds and flowered later than plants from more arid areas.

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Callow, John Nikolaus. "River response to land clearing and landscape salinisation in southwestern Australia". University of Western Australia. School of Earth and Geographical Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0085.

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[Truncated abstract] Land clearing is known to increase runoff, and in many dryland landscapes is also associated with rising saline watertables, causing increased stream salinity and degrading riparian vegetation. The limited understanding of how river morphology responds to these changes and the potential for vegetation-based strategies to offer river management options under these conditions, has prompted this research. In southwestern Australia the severity of salinity and recent nature of land clearing provides an appropriate setting to investigate river response. A data-based, multidisciplinary methodology was applied to determine how land clearing and landscape salinisation has altered landscape sensitivity through changes in erosive potential, system connectivity and material threshold mechanisms, and how these affect patterns of river response. The study investigated the responses of morphologically similar reaches across fifty two study sites in the Kent River and Dalyup River catchments, in the south coastal rivers region of Western Australia. Land clearing was found to have significantly altered the hydrologic regime and erosive potential in both frequency and magnitude, with flow becoming more perennial, and increased annual discharge, flood peaks and bankfull flow frequency. While sediment transport rates have also increased since land clearing, they remain low on a global scale. Human response to a reduced rainfall regime and related water security pressures has caused large hillslope areas to be decoupled from the main channels by bank and farm dam construction, and have reduced downstream transmission of change. ... By contrast, steeper-sloped mid-catchment areas with minimal vegetation degradation caused by salinity are associated with higher erosive potential. A more erosive response is observed in these reaches where floodplains have been cleared for agricultural purposes. A conceptual model of vegetation growth across the salinity gradient observed in the study catchments was developed, and applied to selected river styles to assess the potential that vegetation-based strategies offer for river management. This work identifies the unsuitability of river restoration strategies, but the potential for river restoration or remediation in a saline landscape. Hydraulic modelling demonstrated that river rehabilitation strategies such as improving the vegetation condition of the riparian buffer using native or commercial species on areas elevated above saline flow can stabilise reaches. For river styles in wide and flat valleys, there is limited potential for vegetation-based river rehabilitation under the current salinity gradient. Field observation and modelling suggest that river remediation may offer geomorphic management options in salt-affected reaches through channelisation to lower watertables, and further research on this is warranted. This work found a consistent response for river styles across the two study catchments. Based on the understanding of river response and the potential for vegetation-based river management for each style, this research offers a regional-scale tool for river management in a saline landscape.

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Shahrestani, Nakisa. "An ecological characterisation of a shallow seasonal claypan wetland, Southwestern Australia". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2017. https://ro.ecu.edu.au/theses/2045.

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Perched, seasonal claypans of southwestern Australia are poorly understood in terms of their ecological character, such as relationship between hydrology and their biota. An example is Little Darkin Swamp, located on the Darling Plateau in southwestern Australia. The overall aim of this thesis was to describe its ecological character, to understand what drives this claypan system and how its ephemeral nature affects wetland processes and functions. This study first comprised a detailed characterisation of the wetland’s attributes, following the geomorphic-hydrological approach proposed by Semeniuk and Semeniuk (2011). This revealed that its hydrology is highly dependent on rainfall, that it is an endorheic system, with a basin that is structurally spatially heterogeneous with distinct vegetation zones, and that surface waters have nutrient levels that are similar to oligotrophic systems. These features make it similar to other claypan wetlands of southwestern Australia and vernal pools of California, USA. Continuous high-frequency dissolved oxygen data during the hydroperiod showed that there are large temporal and spatial variations in ecosystem metabolism, and that the trophic status of the wetland is finely balanced, fluctuating between auto- and heterotrophy due to its ephemeral nature. Due to its oligotrophic nature, rates of gross primary production (GPP) and respiration (R) were overall low, and the wetland was overall slightly autotrophic over the study period. Furthermore, dual isotope analysis of δ13C and δ15N of sources and consumers revealed that aquatic macrophytes make a higher contribution to the food web compared to other sampled sources. However, the food web was also supported by sources of carbon that were not sampled, probably filamentous algae and methanotrophic bacteria. Experimental re-hydration of dried sediments emphasized that the seasonality of the water regime, and the shallow bathymetry of the basin, influences organic matter content, nutrient levels, oxygen consumption, plant growth and macroinvertebrate richness, differently between the centre of the wetland versus the edges. These results confirmed that there are at least two distinct zones in the wetland in terms of biotic response following rewetting, caused by the differences in duration and frequency of inundation of the sediments. The outcomes of this study showed that the ephemerality (i.e. seasonal drying and wetting) of Little Darkin Swamp drives important internal ecosystem processes, such as ecosystem metabolism, nutrient cycling, and primary production, which in turn determine the trophic status and distribution of biotic communities in the wetland. Therefore, any changes to the hydrological regime will greatly affect how these system functions and can potentially negatively impact such unique shallow, seasonal perched systems of southwestern Australia.

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Smith, Russell Stephen. "The ecology of two rare Chamelaucium species (Myrtaceae) from Southwestern Australia". Thesis, Smith, Russell Stephen (1994) The ecology of two rare Chamelaucium species (Myrtaceae) from Southwestern Australia. Masters by Research thesis, Murdoch University, 1994. https://researchrepository.murdoch.edu.au/id/eprint/51903/.

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Studies were carried out into various aspects of the ecology of Chamelaucium erythrochlorum m.s. and C. roycei m.s. (Myrtaceae), two declared rare and endangered shrubs restricted to the south west of Western Australia. Initially a soil and vegetation survey was a carried out at the site of all known populations of C erythrochlorum and C. roycei and at some nearby environmentally similar areas where the species did not occur. In addition, aspects of the water relations, phenology and reproductive biology of both species was investigated. Measurements of various floral characters and leaf length were compared for a number of the populations of C. erythrochlorum. Chamelaucium erythrochlorum was found on a range of soils from the infertile gravelly soils at Dardanup Block near Bunbury to fertile red-brown alluvial loams at the Yoongarillup site near Busselton. The soil of the C. roycei sites in the Tutunup-Ruabon area near Busselton varied from moderately acid, brown sandy loams to red-brown loams over a sheet laterite hardpan at a shallow depth. Classification of the C. erythrochlorum quadrats produced four community groups, determined primarily by understorey species composition. These groups were partly based on geographic factors and partly on topographic position. All quadrats were in the Eucalyptus marginata - E. calophylla or E. marginata - E. haemotoxylon forest structural type. Classification of the C. roycei sites and other heathland sites, produced three vegetation groups, with two of the groups containing C. roycei. All of the vegetation groups are structurally mid-dense to dense heathland 0.5 to 1.2 metres high with occasional emergents to 3 metres. Studies into the water relations of C. erythrochlorum, Bossieaea omata and Hypocalymma robustum at Dardanup Block showed that pre-dawn xylem pressure potentials (XPP) were not significantly different between the three species within the C. erythrochlorum "band" in either summer or autumn. C. erythrochlorum was apparently not restricted to this "band" because of increased moisture availability to the adult plants. Mid-morning XPP only was measured at the C. roycei site (Tutunup), where C. roycei had the second lowest XPP of the six species measured although it was not significantly different from any of them. Some of the heathland species, but not C. roycei, showed no fall in late-moming XPP between December and March which indicates that they were probably accessing abundant water below the laterite hardpan. Shoot growth of C. erythrochlorum in 1992/93 at Sabina River started in mid July which was about two weeks earlier than at Dardanup. Flowering was also more advanced at Sabina River (August compared to December) and the flowering season lasted considerably longer (until May) than at Dardanup Block where it finished in February. More plants in the long-unburnt area at Sabina River produced flowers than in the recently burnt area, and they also produced more flowers per plant. In contrast to those at Sabina River very few of the C. erythrochlorum plants monitored at Dardanup Block flowered over the three seasons of the study. Many of the flowers of C. erythrochlorum at Sabina River were damaged by ant grazing in February. The damage in most cases was caused by the insect chewing a hole in the ovary or eating part of the stamen or petals. Compared to Sabina River there was very little insect grazing of C. erythrochlorum at Dardanup Block. All adult plants censused at Sabina River survived over the two and a half years of the study. However 15% of the monitored plants at Dardanup Block had died by the end of October 1993. Most of the plant deaths occurred in late autumn or early winter, primarily from the effects of the summer/autumn drought. Shoot growth in C. roycei started in June and extended through to late January. Flower formation, which was prolific, tended to coincide with shoot growth and plants in the wetter area had the longest flowering season. By February 1992 almost three quarters of the adult C. roycei at Tutunup had died, apparently from drought. All of the seedlings in the burnt area at Tutunup died in mid-summer while only 17.5% of the seedlings on the railway embankment did so probably because those on the embankment were more mature. A leaf and floral morphometric study showed that the populations of C. erythrochlorum could be split into those with larger flowers with longer styles and those with smaller flowers with shorter styles. The flowers at Dardanup Block are intermediate between the two groups. The C. erythrochlorum populations can also be split into two groups in regard to leaf length. A study of ovule and pollen numbers in both rare species showed that the most common number of ovules/flower for C. roycei is 8 (62% of flowers) and that for C. erythrochlorum is 9 (37%) though 10 and 8 ovules/flower were also quite common. In C. erythrochlorum from Sabina River the lower ring of anthers had 20 to 30% more pollen grains than the upper anthers. There was a large difference in the proportion of apparently inviable pollen between the large-flowered and small-flowered types. The total number of pollen grains per ovule (pollen/ovule ratio) for C. erythrochlorum was about 610 for the large-flowered and small-flowered types assuming 9 ovules/flower which indicates that this species is facultatively xenogamous. However the high proportion of inviable pollen in some plants, and the fact that their ovaries develop only a single ovule, will have a large bearing on the reproductive success of individual plants. The lower anthers in C. roycei had more pollen grains than those in the upper whorl, though the difference between the two anther positions was less than for C. erythrochlorum. The proportion of apparently inviable grains in C. roycei was much lower than in C. erythrochlorum. The pollen/ovule ratio in C. roycei from Tutunup is about 540, assuming 8 ovules/flower which indicates facultative xenogamy. However, retention of self pollen on the stigma would seem to promote autogamy, or at least prevent cross pollen from reaching the stigma.

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Rhind, Susan Gaye. "Ecology of the brush-tailed phascogale in jarrah forest of southwestern Australia". Thesis, Rhind, Susan Gaye (1998) Ecology of the brush-tailed phascogale in jarrah forest of southwestern Australia. PhD thesis, Murdoch University, 1998. https://researchrepository.murdoch.edu.au/id/eprint/52136/.

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Abstract (sommario):

This study investigated the ecology of the marsupial brush-tailed phascogale (Phascogale tapoatafa; phascogale) in jarrah forest of Western Australia (WA). The thesis provides a descriptive account of the species' population dynamics, the phascogale’s size and growth, foraging ecology and nesting behaviour. The main work was undertaken between 1992-1995 and information was gathered by capture and by using radiotelemetry. The availability of food sources and refuge sites was examined and the species' immediate response to a logging operation was investigated. On a broader scale, the taxonomy of phascogales in WA was reviewed and their past and present distributions were explored by modelling and examination of museum records. The species has previously been subject to only one detailed study and this was undertaken in the State of Victoria. Both similarities and differences were observed between the phascogales in WA and Victoria. Many of the differences appeared to have a nutritional basis. Phascogales are primarily arboreal insectivores and some of the invertebrates most commonly found in scats and stomachs were not abundant on trees. Nectarivory was very rarely observed (cf. Victoria). While phascogales are generalists in diet, they clearly show preferences for certain foods. The strongly seasonal climate in the southwest (long dry summers and wet winters) and the lack of diversity in tree species and low nectar availability probably limit food for WA phascogales. The dispersed nature of tree invertebrates and the apparent scarcity of some preferred prey, such as beetles, possibly explain the exclusive and often large size of female territories. Phascogales in the study area were smaller and less sexually dimorphic than those in Victoria. Males were 30%, and females 20%, less in weight than those in Victoria. They were similarly smaller in skeletal size. Overall size was also found to vary' between habitat type and between years. In a year of drought phascogales did not achieve typical body size with mature males in that year weighing an average 25% less than usual. The evidence strongly suggests that annual and local availability of food is a major determinant of body size and growth. Such variability in food availability may also be the evolutionary basis behind the litter sizes of WA phascogales. These are smaller than those in Victoria (mode WA = 6, Victoria = 8). The timing of major life-history events was as described for Victorian phascogales, although births occur a little later in the year. All males died at the end of the single annual breeding season (male semelparity) and young took some five to six months to raise to weaning. Some females survived to breed in a second year but the number encountered was low. The toll of lactation probably reduces lifespan and females were often in poor condition at late lactation and maximum maternal effort appears selectively invested in the first litter. Typical of the semelparous species, females initially tried to raise as many young as they have teats. However, there was variation in litter sizes among females. The basis for this was anatomical as females had six, seven or eight teats. Such variation occurred throughout the study area, within litters and appears a State-wide phenomenon. Except in a hybrid Antechinus population, there appears to be no marsupial precedent for intrapopulation and intralitter variation in teat number. In such a strongly selected trait, it is speculated that such variation could only persist if the environment was spatially and/or temporally unstable in terms of food availability. There was no evidence that reduction in teat number was a direct trade-off that improved the chance of surviving to breed on a second occasion, but data were limited. The teat trait is presumably under genetic control and the promiscuous mating behaviour of phascogales may contribute, via multiple paternity, to the intralitter variability observed. In the year of drought litters were significantly female biased. Neither sex were sexually dimorphic until they began foraging for themselves, therefore such bias was unlikely to reduce maternal stress during the drought conditions. The adaptive advantage of the bias was undetermined, but current literature indicates that such bias occurs at conception. However, female offspring probably have better post-weaning survival than males. Examination of refuge requirements showed that natural nest sites were located in tree hollows. The profile of the trees chosen agree with most studies on hollow-nesting species. There was no apparent preference for particular tree species but there was a preference for nesting in older and senescent or dead trees. Females with dependent young showed particular preference for these trees' forms. However, once a tree was used, no tree characteristics measured were predictors of the tree being used on further occasions. Excluding females with young, phascogales typically spent 2-5 days nesting in the one refuge before moving to another. Females moved between alternative refuges more than males and home range maintenance is proposed to account for the difference (males were not territorial cf. females). For both sexes, parasite avoidance might account for the generally low level of nest-site fidelity. Individuals were estimated to use around 27 (males) and 38 (females) different nest-sites during one year of adult life. The parameters of hollows examined showed a preference for using hollows with small entrances. More than predator avoidance, interspecific competition for hollows may explain such selectivity. Following the year of drought, communal nesting was common in autumn and winter. This was in marked contrast to data gathered early in the study and to the nesting behaviour of Victorian phascogales. Communal nesting was probably an energy conserving strategy adopted to compensate for unusually small body size. This behaviour may have been a single year event. However, as phascogales in the area are normally much smaller in body mass than those studied in eastern Australia, they may tend to nest communally in winter or when under conditions of hardship. The immediate response of phascogales to logging was examined. Those affected continued to travel through and feed in the logged areas, which reinforces the concept of high site fidelity among animals. Phascogales were commonly found feeding among ground debris in cut areas indicating flexibility in foraging mode. With rare exceptions they ceased nesting in trees in the logged parts of their territories and confined such nesting to surrounding uncut forest. This suggests that the forestry practice of retaining a select number of hollow-bearing trees/ha may be insufficient to meet the species' refuge requirements in logged areas. Of concern is that currently unlogged sections in logged forest can be cut within 10-20 years yet trees take some 200 years to develop hollows. Additionally, the value of young regrovvth as a food source to this species is questionable. The study highlights the concerns that many scientists have regarding the preservation of hollow-nesting fauna in areas that are impacted by logging. A revision of the species taxonomy (including the subspecies P. t. pirata) indicates that southern WA phascogales warrant subspecies status. Differences in basiacranial features were found between the regional groups in Australia. However, the issue of long-term geographic and reproductive isolation is perhaps the greater argument for suggesting subspecific status for WA phascogales. This is currently being examined using mitochondrial DNA techniques. This will provide not only a DNA profile of similarities and presumed differences between WA and southeastern phascogales, but will give an estimation of the time that the two groups have been separated. A modelling exercise undertaken to examine the potential past distribution of WA phascogales showed that climatic conditions favourable to this species are found throughout the southern part of WA. For many of these areas there are no records of phascogales although a single historical work (1909) indicated that they were present in these areas. At that time they were apparently already extinct in some areas and dying out in others. A survey of the northern jarrah forest and a few other areas (by using nestboxes) failed to detect phascogales. The population examined during this study was therefore quite unusual in density, as phascogales were readily found in nestboxes. A myriad of factors culminating in low feral predation in the area seems the most likely explanation for the high densities observed. The conservation status of phascogales in areas other than the study region requires examination. Predation by exotic predators might account for the species' rarity, but food appears a generally limiting factor for phascogales and processes that alter habitat productivity may significantly impact this species.

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Groom, Philip K. "Ecology and ecophysiology of southwestern Australian hakea species with contrasting leaf morphology and life forms". Thesis, Curtin University, 1996. http://hdl.handle.net/20.500.11937/2292.

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Abstract (sommario):

Members of the genus Hakea (Proteaceae) are sclerophyllous, evergreen perennial shrubs or small trees endemic to Australia, with 65% of species confined to the South-West Botanical Province (southwestern Australia). Southwestern Australian Hakea species possess two contrasting leaf morphologies (broad or terete leaves) and fire-related life forms (non-sprouting (fire-killed) or resprouting (fire-surviving)), with each species representing one of four leaf morphology-life form groups.Representative species within each group were studied to determine whether they display similar distribution and ecophysiological patterns at both the adult and seedling stages. The distribution of species within these groups was best based on averages and variations in annual temperature and rainfall. The highest percentage of terete leaved non-sprouters (25 species) occurred in areas of low-moderate rainfall with large annual temperature ranges, whereas terete leaved resprouters (14 species) displayed a patchy distribution. Broad leaved resprouters (28 species) dominated areas of strongly seasonal rainfall, with few species occurring in the drier regions. Broad leaved non-sprouters (33 species) were best represented in areas of low annual temperature. The distribution of non-sprouters/resprouters may be due to the effect of climatic factors on seedling recruitment and/or fire frequencies. Leaf morphology appears to have a more direct influence on species distribution, as broad leaves are favoured in regions of medium-high, seasonal rainfall (less stressful habitats) while terete leaves are better adapted to tolerate hot, dry environments.Terete leaves are either simple (needle-like) or 2-3 pronged, and, apart from their narrow width, are characterised by their greater leaf thickness (> 1 mm), smaller projected area and mass, higher leaf mass per area (a measure of sclerophylly) and a lower density than broad leaves. Broad leaves are much more variable in their shape. Increased leaf thickness and sclerophylly in terete leaves can be partially attributed to the presence of a central parenchyma core and increased palisade thickness. This core is surrounded a compact network of fibre-capped vascular bundles. Thickness and sclerophylly were good indicators of relative nutrient content in terete, but not broad leaves. Both leaf types have a thick cuticle (> 20 mu m) and sunken stomates, with terete leaves possessing a greater stomatal density than broad leaves. Broad leaves are bilateral and hence amphistomatous. Adult and seedling leaves (of a similar leaf type) differed in morphology, but not anatomy, with some species producing broad seedling leaves and terete adult leaves.Seedlings growing under optimal growth conditions (full sunlight, well watered) in pots showed no relationship between rate of growth and ecophysiology with respect to the four species groupings, although seedlings of non-sprouters and broad leaved species had higher transpiration and photosynthetic rates than seedlings of resprouters and terete leaved species respectively. In response to high air temperatures (> 35°C), leaf temperatures close to or lower than the surrounding air temperature only occurred for terete leaved species possessing small individual and total leaf areas. By maintaining leaf photosynthesis rates during periods of relatively high air temperatures, terete leaved seedlings were able to produce more biomass per leaf area while retaining a low leaf area per seedling mass. When subjected to periods of water stress (withholding water), differences in water relations were most evident between seedlings of non-sprouters and resprouters, with resprouter seedlings showing an ability to minimise the decrease in relative water content for a given decrease in XPP. Although terete leaves possess many xeromorphic attributes, terete leaved seedlings were not necessarily superior at avoiding/tolerating drought. Terete leaves in seedlings may have alternative heat dissipation and/or anti-herbivore properties.Seasonal water relations of adult plants were monitored for over a year, including a period of prolonged summer drought at four sites (two on laterite (rocky substrate) and two on deep sand). The eight species inhabiting the lateritic sites were more stressed (more negative xylem pressure potentials (XPP)) in summer than the eight species on sandy soils, with lower conductances and higher leaf specific resistivity (XPP/area-based transpiration, LSR). Broad leaved species had higher transpiration rates and LSR, and more negative midday XPP throughout the study than terete leaved species. When spring (predrought) and summer (drought) data were compared, non-sprouters had lower XPP in summer, and lower transpiration rates and conductances in both seasons than resprouters. Non-sprouters on lateritic sites had the lowest water relations values in summer (drought tolerators). There was a tendency for broad leaved resprouters on sandy soils to have higher summer water relations values (drought avoiders). Broad leaved non-sprouters on lateritic soils could be considered the most water stressed group, with substantial plant death during the summer period. Terete leaved species on sandy soils were the most conservative in their water usage.

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Luxton, Sarah Jayne. "Modelling refugia for improved conservation outcomes in the northern jarrah forest, southwestern Australia". Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/84066.

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Libri sul tema "Southwestern Australia"

Latchford, Jane A. The effects of runnelling: A technique for controlling mosquitoes in saltmarshes of southwestern Australia : a report prepared for Department of Health, Western Australia. [Murdoch, W.A.]: School of Biological and Environmental Science, Murdoch University, 2002.

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Saunders, Denis A. Birds of southwestern Australia: An atlas of changes in the distribution and abundance of the wheatbelt avifauna. Chipping Norton, N.S.W: Surrey Beatty & Sons in association with Western Australian Laboratory, CSIRO Division of Wildlife and Ecology, 1995.

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Ad Hoc Meeting on Management of Deepwater Fisheries Resources of the Southern Indian Ocean (2nd 2002 Fremantle, Western Australia). Report of the second ad hoc meeting on management of deepwater fisheries resources of the southwestern Indian Ocean: Fremantle, Western Australia, 20-22 May 2002. Rome: Food and Agriculture Organization of the United Nations, 2002.

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Grey, George. Vocabulary of the Dialects of Southwestern Australia. Creative Media Partners, LLC, 2018.

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Grey, George. Vocabulary of the Dialects of Southwestern Australia. Creative Media Partners, LLC, 2018.

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A Vocabulary of the Dialects of Southwestern Australia. Franklin Classics, 2018.

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Groom, Philip K., e Byron Lamont. Plant Life of Southwestern Australia: Adaptations for Survival. De Gruyter, Inc., 2015.

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Groom, Philip K., e Byron B. Lamont. Plant Life of Southwestern Australia: Adaptations for Survival. Sciendo, 2015.

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Robinson, David, Brian Bush, Brad Maryan e Robert Browne-Cooper. Reptiles and Frogs in the Bush: Southwestern Australia. Univ of Western Australia Pr, 2007.

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Groom, Philip K., e Byron Lamont. Plant Life of Southwestern Australia: Adaptations for Survival. De Gruyter, Inc., 2015.

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Capitoli di libri sul tema "Southwestern Australia"

Predavec, Martin, e Chris R. Dickman. "Ecology of desert frogs: a study from southwestern Queensland". In Herpetology in Australia, 159–70. P.O. Box 20, Mosman NSW 2088, Australia: Royal Zoological Society of New South Wales, 1993. http://dx.doi.org/10.7882/rzsnsw.1993.023.

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Barendse, William. "Speciation in the Genus Mygalopsis in Southwestern Australia". In The Tettigoniidae, 265–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-662-02592-5_14.

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Hobbs, R. J. "Impacts of Land Use on Biodiversity in Southwestern Australia". In Ecological Studies, 81–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-03543-6_5.

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Ruthrof, Katinka X., Joseph B. Fontaine, David D. Breshears, Jason P. Field e Craig D. Allen. "Extreme Events Trigger Terrestrial and Marine Ecosystem Collapses in the Southwestern USA and Southwestern Australia". In Ecosystem Collapse and Climate Change, 187–217. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71330-0_8.

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Hobbs, R. J., R. H. Groves, S. D. Hopper, R. J. Lambeck, B. B. Lamont, S. Lavorel, A. R. Main, J. D. Majer e D. A. Saunders. "Function of Biodiversity in the Mediterranean-Type Ecosystems of Southwestern Australia". In Mediterranean-Type Ecosystems, 233–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-78881-9_5.

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Wardell-Johnson, Grant, e Owen Nichols. "Forest wildlife and habitat management in southwestern Australia: knowledge, research and direction". In Conservation of Australia’s Forest Fauna, 161–92. P.O. Box 20, Mosman NSW 2088, Australia: Royal Zoological Society of New South Wales, 1991. http://dx.doi.org/10.7882/rzsnsw.1991.015.

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Schellenberg, Stephen A., Henk Brinkhuis, Catherine E. Stickley, Michael Fuller, Frank T. Kyte e Graham L. Williams. "The Cretaceous/Paleogene transition on the East Tasman Plateau, southwestern Pacific". In The Cenozoic Southern Ocean: Tectonics, Sedimentation, and Climate Change Between Australia and Antarctica, 93–112. Washington, D. C.: American Geophysical Union, 2004. http://dx.doi.org/10.1029/151gm07.

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Guilfoyle, David R., Myles B. Mitchell e Wayne Webb. "Identity and Culturally Defined Methods of Adaptation Amongst the Wadandi People of Southwestern Australia". In Identity and Heritage, 85–96. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09689-6_9.

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Bell, David T. "Plant community structure in southwestern Australia and aspects of herbivory, seed dispersal and pollination". In Tasks for vegetation science, 63–70. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0908-6_6.

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Murakami, Msk, Mkt Murakami, K. Nitta, K. Yamaguchi, H. Yamamoto, M. Karasawa, Y. Nakahori et al. "Absolute Determination of Gravity in Australia for the Purpose of Establishment of Precise Reference Frame for Mean Sea Level Change Monitoring in Southwestern Pacific". In International Association of Geodesy Symposia, 32–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-03482-8_7.

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Atti di convegni sul tema "Southwestern Australia"

Doucette, Jeffrey S. "Bedform Migration on a Sheltered Sandy Beach in Southwestern Australia". In 27th International Conference on Coastal Engineering (ICCE). Reston, VA: American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40549(276)207.

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Chen*, Liwen, Wu-Cheng Chi, Yu-Hsien Lin, Hsieh-Tang Chiang, Christian Berndt e Saulwood Lin. "Gas Hydrate Related Fluid Flow Study Offshore Southwestern Taiwan". In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2210684.

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Rutherford, J. L., e T. J. Munday. "Airborne EM for Predicting Catchment Salt Yields — A Cautionary Tale from Southwestern Australia". In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2006. Environment and Engineering Geophysical Society, 2006. http://dx.doi.org/10.4133/1.2923706.

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Rutherford, J. L., e T. J. Munday. "Airborne EM for predicting catchment salt yields – A cautionary tale from southwestern Australia". In 19th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 2006. http://dx.doi.org/10.3997/2214-4609-pdb.181.72.

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Grigg, Andrew. "Adaptive rehabilitation management and a drying climate: unique challenges for Alcoa's bauxite mine rehabilitation in southwestern Australia". In Seventh International Conference on Mine Closure. Australian Centre for Geomechanics, Perth, 2012. http://dx.doi.org/10.36487/acg_rep/1208_40_grigg.

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Han*, Wei-Chung, Char-Shine Liu, Wu-Cheng Chi e Yunshuen Wang. "Structural Inversion and Channel Evolution in a Transition Zone Across the Boundary Between Passive and Active Continental Margins: An Example From Offshore Southwestern Taiwan". In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2203120.

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Marshall, John K. "Water Economy of Macrozamia riedlei in the Jarrah (Eucalyptus marginata) Forest of Southwestern Western Australia". In CYCAD 2005. The New York Botanical Garden Press, 2007. http://dx.doi.org/10.21135/893274900.014.

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Munday, T. J., J. L. Rutherford, D. Sattel e A. Fitzpatrick. "Modelling the Subsurface Distribution of Salt in Dryland Catchments of Southwestern Australia Using AEM Data — A Comparison of EM Interpretation Techniques". In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2006. Environment and Engineering Geophysical Society, 2006. http://dx.doi.org/10.4133/1.2923707.

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Munday, T. J., J. L. Rutherford, D. Sattel e A. Fitzpatrick. "MODELLING THE SUBSURFACE DISTRIBUTION OF SALT IN DRYLAND CATCHMENTS OF SOUTHWESTERN AUSTRALIA USING AEM DATA - A COMPARISON OF EM INTERPRETATION TECHNIQUES". In 19th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 2006. http://dx.doi.org/10.3997/2214-4609-pdb.181.73.

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O’CONNELL, ANTHONY M., TIM S. GROVE, DANIEL S. MENDHAM e STANLEY J. RANCE. "INTER-ROTATION SITE MANAGEMENT OF EUCALYPT PLANTATIONS IN SOUTHWESTERN AUSTRALIA: A PARTNER PROJECT IN THE CIFOR NETWORK ON SITE MANAGEMENT AND PRODUCTIVITY". In Proceedings of the International Symposium. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704504_0024.

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