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1
Holmes, Katie. „The 'Mallee-Made Man': Making Masculinity in the Mallee Lands of South Eastern Australia, 1890-1940“. Environment and History 27, Nr. 2 (01.05.2021): 251–75. http://dx.doi.org/10.3197/096734021x16076828553520.
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The southern Australian Mallee is a broad ecoregion comprising distinct landscapes, and the clearing and farming of these lands have presented specific challenges to generations of white settlers. Cultivation of this region was characterised as 'one of the most strenuous and resolute battles with Nature'. So began the shaping of an enduring mythology around the 'Mallee man'. In the context of the settler state, this mythology was forged through race, place and gender, with devastating environmental consequences. It has been consistently evoked to suggest that the specific environment of the Mallee worked to produce a special type of 'home grown' masculinity. At the same time, the State sought to provide a particular type of man to work the Mallee lands. This article examines the ways ideas about masculinity shaped men's engagement with the environment and the impact of government settlement schemes on both the myth and lives of Mallee men.
2
J. Hobbs, Richard. „The wheatbelt of Western Australia“. Pacific Conservation Biology 9, Nr. 1 (2003): 9. http://dx.doi.org/10.1071/pc030009.
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DEVELOPMENT for broadscale wheat and sheep farming in Western Australia has produced a seemingly uniform landscape over much of the southwest of Western Australia. However, this area, commonly called the wheatbelt (Fig. 1), consists of at least four of the biogeographic regions designated on the basis of physical and biological measures (such as climate, geology, landform landuse, flora and fauna) in the Interim Biogeographic Regionalization of Australia (Thackway and Cresswell 1994). The four Interim Biogeographic Regionalization of Australia regions making up the wheatbelt are the Geraldton Sandplains, Avon Wheatbelt, Mallee and Esperance Plains, a total area of 24 766 406 ha.
3
Spinelli, Raffaele, Mark Brown, Rick Giles, Dan Huxtable, Ruben Laina Relaño und Natascia Magagnotti. „Harvesting alternatives for mallee agroforestry plantations in Western Australia“. Agroforestry Systems 88, Nr. 3 (16.05.2014): 479–87. http://dx.doi.org/10.1007/s10457-014-9707-4.
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4
Wu, Hongwei, Qiang Fu, Rick Giles und John Bartle. „Production of Mallee Biomass in Western Australia: Energy Balance Analysis†“. Energy & Fuels 22, Nr. 1 (Januar 2008): 190–98. http://dx.doi.org/10.1021/ef7002969.
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5
MOEZEL, PAUL G., und DAVID T. BELL. „Plant species richness in the mallee region of Western Australia“. Austral Ecology 14, Nr. 2 (Juni 1989): 221–26. http://dx.doi.org/10.1111/j.1442-9993.1989.tb01429.x.
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6
Bell, Sarah J., Allan F. M. Barton und Laura J. Stocker. „Agriculture for Health and Profit in Western Australia: The Western Oil Mallee Project“. Ecosystem Health 7, Nr. 2 (Juni 2001): 116–21. http://dx.doi.org/10.1046/j.1526-0992.2001.007002116.x.
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7
Hopper, Stephen D., und Nathan K. McQuoid. „Two new rare species and a new hybrid in Eucalyptus series Tetrapterae (Myrtaceae) from southern coastal Western Australia“. Australian Systematic Botany 22, Nr. 3 (2009): 180. http://dx.doi.org/10.1071/sb06034.
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Three new rare taxa allied to the conspicuous, common four-winged mallee (Eucalyptus tetraptera Turcz.) are described. E. sweedmaniana is a large-leaved and prostrate coastal mallee known only from Mount Arid, Western Australia. E. brandiana, a non-lignotuberous mallet, occupies spongolite hilltops and escarpments near the Fitzgerald River Inlet in Fitzgerald River National Park, Western Australia. A single hybrid mallet, E. arborella × brandiana, is described from the type locality of E. brandiana. Both new species and the new hybrid show potential for horticultural use, given their compact habit, large leaves and conspicuous red floral hypanthia and fruits. E. arborella × brandiana and E. brandiana are particularly at risk, being highly localised endemics that are killed by fire.
8
F.Lawrence, John. „The Australian Ommatidae (Coleoptera:Archostemata): new species, larva and discussion of relationships“. Invertebrate Systematics 13, Nr. 3 (1999): 369. http://dx.doi.org/10.1071/it99008.
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The Australian Ommatidae (Coleoptera:Archostemata) are reviewed and Omma rutherfordi, sp. nov., is described from the South Australian mallee and Stirling Range of Western Australia. A putative Omma larvais also described from Western Australia and compared with other larvae representing the suborder Archostemata. Comments are made on the larvae of Archostemata, constitution of the suborder, and relationships and ranking of family groups.
9
Smith, Patrick F. „Bird activity in oil mallee plantings in the wheatbelt of Western Australia“. Ecological Management & Restoration 10, Nr. 3 (Dezember 2009): 236–38. http://dx.doi.org/10.1111/j.1442-8903.2009.00496.x.
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10
Nuttall, J. G., G. J. O'Leary, N. Khimashia, S. Asseng, G. Fitzgerald und R. Norton. „‘Haying-off' in wheat is predicted to increase under a future climate in south-eastern Australia“. Crop and Pasture Science 63, Nr. 7 (2012): 593. http://dx.doi.org/10.1071/cp12062.
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Under a future climate for south-eastern Australia there is the likelihood that the net effect of elevated CO2, (eCO2) lower growing-season rainfall and high temperature will increase haying-off thus limit production of rain-fed wheat crops. We used a modelling approach to assess the impact of an expected future climate on wheat growth across four cropping regions in Victoria. A wheat model, APSIM-Nwheat, was performance tested against three datasets: (i) a field experiment at Wagga Wagga, NSW; (ii) the Australian Grains Free Air Carbon dioxide Enrichment (AGFACE) experiment at Horsham, Victoria; and (iii) a broad-acre wheat crop survey in western Victoria. For down-scaled climate predictions for 2050, average rainfall during October, which coincides with crop flowering, decreased by 32, 29, 26, and 18% for the semiarid regions of the northern Mallee, the southern Mallee, Wimmera, and higher rainfall zone, (HRZ) in the Western District, respectively. Mean annual minimum and maximum temperature over the four regions increased by 1.9 and 2.2°C, respectively. A pair-wise comparison of the yield/anthesis biomass ratio across climate scenarios, used for assessing haying-off response, revealed that there was a 39, 49 and 47% increase in frequency of haying-off for the northern Mallee, southern Mallee and Wimmera, respectively, when crops were sown near the historically optimal time (1 June). This translated to a reduction in yield from 1.6 to 1.4 t/ha (northern Mallee), 2.5 to 2.2 t/ha (southern Mallee) and 3.7 to 3.6 t/ha (Wimmera) under a future climate. Sowing earlier (1 May) reduced the impact of a future climate on haying-off where decreases in yield/anthesis biomass ratio were 24, 28 and 23% for the respective regions. Heavy textured soils exacerbated the impact of a future climate on haying-off within the Wimmera. Within the HRZ of the Western District crops were not water limited during grain filling, so no evidence of haying-off existed where average crop yields increased by 5% under a future climate (6.4–6.7 t/ha). The simulated effect of eCO2 alone (FACE conditions) increased average yields from 18 to 38% for the semiarid regions but not in the HRZ and there was no evidence of haying-off. For a future climate, sowing earlier limited the impact of hotter, drier conditions by reducing pre-anthesis plant growth, grain set and resource depletion and shifted the grain-filling phase earlier, which reduced the impact of future drier conditions in spring. Overall, earlier sowing in a Mediterranean-type environment appears to be an important management strategy for maintaining wheat production in semiarid cropping regions into the future, although this has to be balanced with other agronomic considerations such as frost risk and weed control.
11
Sudmeyer, R. A., T. Daniels, H. Jones und D. Huxtable. „The extent and cost of mallee - crop competition in unharvested carbon sequestration and harvested mallee biomass agroforestry systems“. Crop and Pasture Science 63, Nr. 6 (2012): 555. http://dx.doi.org/10.1071/cp12129.
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Mallee-based agroforestry has potential to provide farmers with new income sources derived from biofuels, biofeedstocks, and carbon sequestration. Although mallees are planted on >12 700 ha across the south-west of Western Australia, very little commercial harvesting of mallee has occurred to date. The development of biomass processing industries is constrained by lack of robust information regarding the productivity of integrated mallee and agricultural systems. This study addresses this constraint by quantifying the productivity and economics of agricultural crops and pastures growing in the competition zone adjacent to mallee belts at 15 sites across the Western Australian wheatbelt. The sites covered a range of climate and edaphic conditions, three mallee species (Eucalyptus polybractea R Baker, E. loxophleba ssp. lissophloia LAS Johnson and KD Hill, or E. kochii ssp. plenissima (CA Gardner) Brooker), various crop and pasture rotations, and various mallee harvest-management treatments. Mallee–crop competition was negatively correlated with rainfall and positively correlated with mallee age and size, and greater for crops than pasture. Consequently, extent and magnitude of competition were highly variable across sites and years. On average, mallee–crop competition extended 11.3 m from unharvested belts and reduced crop and pasture yields by 36% within 2–20 m of the mallee belts relative to open paddock yields. This is similar to what has been reported for taller tree species. Harvesting mallees reduced competition such that crop and pasture yield was reduced by 22 or 27% relative to open paddock yields for mallees harvested at 3- or 6+-year intervals, respectively. The economic cost of mallee–crop competition on agricultural enterprises was also highly variable between sites, and between years within individual sites. Averaged across all site-years, the opportunity cost of competition was equivalent to forgoing agricultural production for 14.4 m on each side of unharvested mallee belts, or 9–10 m on each side of harvested belts. Farmers with mallee agroforestry systems will need to manage the economic impacts of competition by reducing agricultural input costs in the competition zone, timing crop-grazing rotations with mallee harvests, ensuring that the width of alleys is at least 25 times the height of the mature trees, and possibly root-pruning mallees in unharvested or long harvest interval systems. This research has shown that mallee–crop competition presents a significant cost to farmers and must be considered when designing mallee agroforestry systems. The findings have relevance for the development of appropriate biomass and carbon sequestration pricing benchmarks for mallee plantings.
12
HENDRICH, LARS, und HANS FERY. „Paroster baylyi sp. n., P. ursulae sp. n. (Col. Dytiscidae, Hydroporinae) and the water beetle diversity of pan-gnammas on isolated granite outcrops in the Mallee of south-western Australia“. Zootaxa 1704, Nr. 1 (15.02.2008): 27. http://dx.doi.org/10.11646/zootaxa.1704.1.2.
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Paroster baylyi sp. n. and P. ursulae sp. n. are described from south-western Australia, and compared with the similar P. michaelseni Régimbart, 1908. Their median lobes, parameres, gonocoxae, gonocoxosterna and habitus are illustrated, and details about their unique habitats and water beetle coenoses are given. The two new species are the first dytiscids to be known breeding solely in temporarily water filled rock-holes—so-called “pan-gnammas”—in the Mallee zone of south-western Australia. The total number of described species in the genus Paroster Sharp, 1882 is now 11. Eight aquatic Coleoptera of the families Dytiscidae and Hydrophilidae are recorded from 13 pan-gnammas on four granite outcrops in south-western Australia.
13
Andersen, AN, und AY Yen. „Canopy Ant Communities in the Semiarid Mallee Region of North-Western Victoria“. Australian Journal of Zoology 40, Nr. 2 (1992): 205. http://dx.doi.org/10.1071/zo9920205.
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Ants were collected from the canopies of mallee eucalypts at Wyperfeld National Park in north-western Victoria by beating foliage on ten occasions from September 1979 to December 1980. The study was conducted at two adjacent sites: one that had been burnt by a wildfire during early 1977, and the other long unburnt. Both sites contained a mixture of three mallee eucalypt species: Eucalyptus dumosa, E. foecunda and E. incrassata. In contrast to the canopies of other eucalypt formations elsewhere in southern Australia, abundance and diversity of ants were very high. Ants represented 43-69% of all invertebrates, and a total of 44 ant species from 19 genera was collected. Iridomyrmex and Camponotus respectively contributed 10 and 11 species, and the most abundant ants were species of Iridomyrmex, Monomorium and Crematogaster. Ant composition was broadily similar at the two sites, and on different canopy species, although significant differences in abundance were apparent for some individual ant species. Except for tree-nesting Podomyrma adelaidae and Myrmecorhynchus sp. nr emeryi, the fauna was dominated by ground-nesting species, most of which appeared to forage on vegetation opportunistically. The unusually high abundance and diversity of the canopy ant fauna are attributed to the close proximity of the mallee canopy to the ground, coupled with an exceptionally rich ground ant fauna.
14
Parsons, Blair C., und Carl R. Gosper. „Contemporary fire regimes in a fragmented and an unfragmented landscape: implications for vegetation structure and persistence of the fire-sensitive malleefowl“. International Journal of Wildland Fire 20, Nr. 2 (2011): 184. http://dx.doi.org/10.1071/wf09099.
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Habitat fragmentation alters fire regimes by changing the spatial and temporal context in which fire operates, potentially altering ecosystem state and threatening taxa. In the fragmented wheatbelt of Western Australia, spatial patterns of contemporary fire and their effects on biodiversity conservation are poorly understood. We addressed this by: (1) determining if fire regimes differed between vegetation remnants of differing sizes and uncleared vegetation, using analysis of satellite imagery; (2) determining vegetation structural responses to time since fire in three habitats: mallee-shrub, Acacia shrublands and mallee-heath; and (3) exploring the consequences of these differences, using the fire-sensitive malleefowl (Leipoa ocellata) as a case study. Fire was infrequent in small remnants, more frequent in large remnants, and most frequent in uncleared areas. Key vegetation structural attributes for malleefowl, such as canopy and litter cover, increased beyond 45 years post-fire in mallee-shrub, reached a plateau in mallee-heath after 30–40 years, and declined in Acacia shrublands after 25–40 years. Senescence in long-unburnt vegetation, combined with rare contemporary fires, suggest progressive decline in habitat quality of Acacia shrublands for malleefowl in the wheatbelt. In the adjacent, continuously vegetated landscapes, more frequent (and extensive) fires in structurally developing mallee-shrub communities are of concern for malleefowl conservation.
15
Burgman, MA. „Cladistics, Phenetics and Biogeography of Populations of Boronia inornata Turcz. (Rutaceae) and the Eucalyptus diptera Andrews (Myrtaceae) Species Complex in Western Australia“. Australian Journal of Botany 33, Nr. 4 (1985): 419. http://dx.doi.org/10.1071/bt9850419.
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Numerical cladistic and phenetic analyses were undertaken on morphometric data from 22 Western Australian populations of the southern Australian shrub Boronia inornata and from the southern Western Australian tree Eucalyptus diptera and its unnamed allies. The E. diptera species complex includes four taxa, three of which are at present unnamed. These species are largely allopatric, although in one location the ranges of two species overlap. Two subspecies of Boronia inornata are described and one of them, subsp. leptophylla, contains three informal variants. Subsp. inornata and two of the variants of subsp. leptophylla are restricted to Western Australia. One variant of subsp. leptophylla is sympatric with subsp. inornata in Western Australia and also occurs in southern South Australia. The events which gave rise to the four species of the E. diptera complex and to the subspecies and variants of B. inornata occurred within the semiarid mallee zone of Western Australia, probably during the Quaternary. Speciation has occurred in a replacement pattern across the southern transitional rainfall zone, which is reflected in at least one other, unrelated taxon.
16
Sluiter, Ian R. K., Andrew Schweitzer und Ralph Mac Nally. „Spinifex–mallee revegetation: implications for restoration after mineral-sands mining in the Murray–Darling Basin“. Australian Journal of Botany 64, Nr. 6 (2016): 547. http://dx.doi.org/10.1071/bt15265.
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Mineral-sands mining in the semiarid and arid zone of south-eastern Australia is now a widespread disturbance that may adversely affect large areas of remnant vegetation, including mallee (Eucalyptus spp.) with hummock grass or spinifex (Triodia scariosa) understorey. No broad-scale restoration projects have been undertaken to revegetate mallee Eucalyptus species with spinifex. We report on the survivorship and relative importance (spatial coverage) of hand-planted tubestock 10 years after establishment in 2001, which included mallee Eucalyptus, Triodia scariosa, Acacia spp. and Hakea spp. These taxa are the dominant plants in a semiarid dune–swale system on a former mineral-sands mine licence area in semiarid, north-western Victoria. Mean survivorship of tubestock was 0.58 ± 0.04. Spinifex (Triodia scariosa), needlewood (Hakea) and several mallee species (Eucalyptus spp.) survived substantially better than the average of all tubestock-planted species, although Acacia spp. had low survivorships. Although the plantings were undertaken in the early stages of the most severe drought in the instrumental record (the ‘Millennium drought’), several taxa survived well and species such as spinifex established and developed ground coverage greater than the benchmark values for the ecological vegetation class of the location. We conclude that hand-planting of tubestock can achieve restoration objectives for this component of spinifex–mallee vegetation, even under extremely arduous conditions associated with long-term drought. We also herald the importance of taking a long-term view to the assessment of revegetation success, in this case 10 years.
17
Yu, Yun, John Bartle, Chun-Zhu Li und Hongwei Wu. „Mallee Biomass as a Key Bioenergy Source in Western Australia: Importance of Biomass Supply Chain“. Energy & Fuels 23, Nr. 6 (18.06.2009): 3290–99. http://dx.doi.org/10.1021/ef900103g.
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NULSEN, R. A., K. J. BLIGH, I. N. BAXTER, E. J. SOLIN und D. H. IMRIE. „The fate of rainfall in a mallee and heath vegetated catchment in southern Western Australia“. Austral Ecology 11, Nr. 4 (Dezember 1986): 361–71. http://dx.doi.org/10.1111/j.1442-9993.1986.tb01406.x.
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Campbell, Lachlan. „Wimmera River (Victoria, Australia) – Increasing Use of a Diminishing Resource“. Water Science and Technology 21, Nr. 2 (01.02.1989): 245–49. http://dx.doi.org/10.2166/wst.1989.0058.
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The Wimmera River is central western Victoria's most important river, rising in the Grampians National Park, filling storages that supply the major water supply to the vast Wimmera and Mallee regions. It passes through the Little Desert National Park, an area of significant scenic, recreation, historical and conservation value and terminates in Victoria's largest inland freshwater lakes (Lakes Hindmarsh and Albacutya). The brittleness of the whole closed Wimmera River system, and the over committal of the water resources was brought to the public's attention when appeals were lodged against the proposal to licence a discharge of high standard secondary effluent from an extended aeration oxidation ditch and lagoon treatment facility at Horsham. Residents, user and community groups, Municipal Councils and Government Departments, aware of the deterioration of the Wimmera River had somewhere to focus their attention. Victoria's and possibly Australia's longest environmental appeal, lasting twenty-five days, and a State Environment Protection Policy, determined that all major point sources of nutrients should be removed from the River. More resources for clearing of unwanted emergent weeds, more facilities for protection of Crown Land and catchments generally, and the implementation of environmental summer flows as piping of the Wimmera-Mallee Stock and Domestic System proceeds, are all required. A River Management Board with strength, wealth, good public relations and a dedication to the task could make the Wimmera River an example for all Australia and a tourist attraction of immense value to the region.
20
Yu, Yun, John Bartle, Daniel Mendham und Hongwei Wu. „Site Variation in Life Cycle Energy and Carbon Footprints of Mallee Biomass Production in Western Australia“. Energy & Fuels 29, Nr. 6 (14.05.2015): 3748–52. http://dx.doi.org/10.1021/acs.energyfuels.5b00618.
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Seymour, M. „Narbon bean (Vicia narbonensis) agronomy in south-western Australia“. Australian Journal of Experimental Agriculture 46, Nr. 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.
22
Wright, Ian J., und Pauline Y. Ladiges. „Geographic Variation in Eucalyptus diversifolia (Myrtaceae) and the Recognition of New Subspecies E. diversifolia subsp. hesperia and E. diversifolia subsp. megacarpa“. Australian Systematic Botany 10, Nr. 5 (1997): 651. http://dx.doi.org/10.1071/sb96019.
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Patterns of geographic variation in morphological and chemical characters are documented in Eucalyptus diversifolia Bonpl. (soap mallee, white coastal mallee). This species is found in coastal and subcoastal Australia from southern Western Australia to Cape Nelson (western Victoria), with a number of disjunctions in the intervening region. Morphological data from adult plants collected at field localities and seedlings grown under uniform conditions were analysed using univariate and multivariate methods, including oneway ANOVA, multiple comparison tests, non-metric multidimensional scaling (NMDS), nearest neighbour networks, and minimum spanning trees. Seedling material was tested for isozyme polymorphism, and adult leaf flavonoids were analysed using liquid chromatography. Morphological and chemical characters are also documented in E. aff. diversifolia, a closely related but unnamed taxon restricted to ironstone outcrops near Norseman (WA), and putative E. diversifolia- E. baxteri hybrids from Cape Nelson. Congruent patterns in data sets distinguish three groups of E. diversifolia adults and progeny: (1) those to the west of the Nullarbor disjunction; (2) South Australian populations to the east of this disjunction; and (3) those from Cape Nelson. Formal taxonomic recognition of the three forms at subspecific level is established, namely E. diversifolia subsp. diversifolia, E. diversifolia subsp. hesperia, and E. diversifolia subsp. megacarpa. Patterns of geographic affinity between populations are consistent with a hypothesis of genetic exchange between normally disjunct regional populations of E. diversifolia via coastal land-bridges exposed during periodic times of low sea level since the mid Tertiary.
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Gaynor, Andrea. „State, Scientists and Citizens: Conserving Lake Magenta and Dragon Rocks, Western Australia“. Historical Records of Australian Science 25, Nr. 2 (2014): 202. http://dx.doi.org/10.1071/hr14015.
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The story of efforts to establish two major nature reserves in the south-eastern wheatbelt of Western Australia illuminates some of the many factors shaping the interaction of citizens, scientists, land management bureaucracies, and other stakeholders around the creation of conservation reserves in a semi-arid region in the mid-20th century. This article highlights the significance of citizen scientists as well as professionals in the reservation process, and traces the increasingly strained relationship between Lands and conservation bureaucracies in the context of the rise of the new environment movement. It also points to the importance of international ideas about conservation aims and methods, and suggests that although shifting appraisals of the productive potential of the land were critical to the outcome of negotiations over the proposed reserves, in this period these semi-arid lands were increasingly valued for their scientific and intrinsic qualities.
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Veth, Peter. „Aridity and settlement in northwest Australia“. Antiquity 69, Nr. 265 (1995): 733–46. http://dx.doi.org/10.1017/s0003598x00082302.
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An element in the changing pattern of Australian archaeology has been the filling-in of great blanks on the archaeological map, once survey and excavation has begun to explore them. The dry lands of the great central and western deserts of Australia, a hard place for humans to this day, have in the last couple of decades come to find a large place in the transitional story.
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Short, Jeff, und Andrew Hide. „Distribution and status of the red-tailed phascogale (Phascogale calura)“. Australian Mammalogy 34, Nr. 1 (2012): 88. http://dx.doi.org/10.1071/am11017.
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The red-tailed phascogale once extended widely across semiarid and arid Australia, but is now entirely confined to the southern wheatbelt of Western Australia, occupying less than 1% of its former range. Here it occurs in a portion of the Avon Wheatbelt, Jarrah Forest, Mallee, and Esperance Plains biogeographical regions. The species persists only in areas that have been extensively cleared for agriculture and where the remaining bushland is highly fragmented. It does not appear to extend into unfragmented habitat in either the Jarrah Forest to the west or Mallee region to the east. It occurs primarily in woodland habitat with old-growth hollow-producing eucalypts, primarily wandoo (Eucalyptus wandoo) or York Gum (E. loxophleba), but records from the periphery of its current range appear to come from a broader range of habitats, including shrublands and various mosaics of woodland, shrubland, and scrub-heath. Key factors limiting persistence are likely to be fragmentation of habitat that is likely to greatly increase the risks associated with dispersal, a shortage of suitable nesting hollows in many vegetation associations, and predation by feral and domestic cats and by foxes. These factors, particularly fragmentation and lack of suitable nesting hollows, suggest that the species’ long-term persistence in areas beyond the wandoo belt is far from assured.
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R. Friend, G., und M. R. Williams. „Impact of fire on invertebrate communities in mallee-heath shrublands of southwestern Australia“. Pacific Conservation Biology 2, Nr. 3 (1995): 244. http://dx.doi.org/10.1071/pc960244.
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A three-year study (1989?92) of the responses of invertebrates to fire was carried out in mallee-heath shrublands in the Stirling Range National Park, Western Australia. Abundances were measured at the Order level for major groups, and at the morphospecies level for Coleoptera. Changes in floristics and vegetation structure were monitored over the same period. At the Order level, variation in abundances was attributable more to locality, seasonal and year-to-year effects than to fire. Responses of beetles at the morphospecies level, however, reflected changes due to fire as well those attributable to season and year. Coleoptera and Diptera were most abundant 40 years after fire, Hemiptera and Orthoptera peaked in earlier seral stages, while Hymenoptera and Araneae showed relatively few fire-related trends. Coleoptera and Diptera best reflected changes due to season, year and fire, and together with some Araneae such as mygalomorph spiders, would most likely be suitable groups to consider in future studies. Multivariate analyses indicated that classification to morphospecies level is essential to elucidate changes due to fire. These analyses also indicated that changes in invertebrate abundance and composition did not accord with changes in floristics or vegetation structure. Each set of data therefore represents different facets of change over time, including those due to fire. Comparing our data with contemporaneous information collected in upland areas of the Park indicates that there is a clear dichotomy in the fire sensitivity of species inhabiting the wet gullies and thickets of the mountains and those occupying the seasonally dry lowland mallee-heaths. Fire management strategies need to take account of this dichotomy by protecting relictual fire sensitive species and habitats.
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Kennington, W. J., und S. H. James. „Contrasting Patterns of Clonality in Two Closely Related Mallee Species from Western Australia, Eucalyptus argutifolia and E. obtusiflora (Myrtaceae)“. Australian Journal of Botany 45, Nr. 4 (1997): 679. http://dx.doi.org/10.1071/bt96082.
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Allozymes were used to investigate patterns of clonal growth (vegetativespread) in two closely related multi-stemmed (mallee) eucalypts from WesternAustralia.Eucalyptus argutifolia Grayling & Brooker,a rare species with a localised distribution, appeared to be extensivelyclonal. Several populations had putative clones larger than 100m2, with the largest clone size estimated to be 306m2. By contrast, the more common and widespreadE. obtusiflora DC. was far less clonal and had a maximumclone size of 22 m2. Both genetic and environmentalfactors may have contributed to these contrasting patterns of clonal growth.When clonality is taken into account, most populations ofE. argutifolia had very few individuals (≤ 12 genets)and estimates from this study suggest that the entire species may consist ofless than 500 genets.
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Young, Diana. „Water as Country on the Pitjantjatjara Yankunytjatjara Lands South Australia“. Worldviews: Global Religions, Culture, and Ecology 10, Nr. 2 (2006): 239–58. http://dx.doi.org/10.1163/156853506777965839.
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AbstractAnangu, Pitjantjatjara and Yankunytjatjara people living in the north-western areas of South Australia conceptualize changes in the surface of land as evincing the presence of ancestral power. Rain is one such catalyst of change, though it is by no means a certainty on the Pitjantjatjara Yankunytjatjara Lands. When it does appear, water does not stay long on the surface: it is shimmering and unstable. This paper examines the nature of various water sources in contemporary indigenous life, the spatial relationships between earth and sky and the dialectic between life and death that they mediate.
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Cochrane, HR, G. Scholz und AME Vanvreswyk. „Sodic soils in Western Australia“. Soil Research 32, Nr. 3 (1994): 359. http://dx.doi.org/10.1071/sr9940359.
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Sodic soils are common throughout Western Australia, particularly in the south-west agricultural area where they occur mainly as duplex or gradational profiles. Soils with sodic properties are dominant in 26% of the state; saline-sodic sediments and soils in intermittent streams, lakes and estuarine plains occupy a further 5%. Sodic soils are moderately common throughout the south and western portion of the rangeland areas (38% of the state). The south-west coastal sands and the desert and rangeland soils to the north and east of the state are rarely sodic. Although sodicity has been recognized as a discrete problem in W.A. soils since the 1920s, the extent and severity of sodicity has been satisfactorily described only for small areas of the state and most land managers are unaware of the role sodicity plays in limiting the productivity of their soils. Sodicity is implicated in a diversity of problems for both agricultural and non-agricultural uses of Western Australian soils. Subsoil impermeability is probably the most widespread of these, but no comprehensive, quantitative assessment of the influence of exchangeable sodium on subsoil properties has been undertaken. Topsoil sodicity is much less extensive but can severely restrict land productivity, particularly on sandy loam and finer textured soils which set hard when dry. The physical behaviour of Western Australian topsoils cannot usefully be predicted from measurements of exchangeable sodium alone because soils differ so greatly in their response to changing exchangeable sodium. Some remain structurally stable at ESP values >15 while others are so 'sodium-sensitive' that they exhibit highly dispersive behaviour at ESP values as low as 2%. Land values over much of the dryland farming and pastoral areas of W.A. do not justify sustained use of amendments which would reduce soil exchangeable sodium contents. Efficient management of sodic soils in these areas must rely on the prevention of degradation and the use of biological and physical means to maintain adequate soil physical properties. Effective restoration of degraded sodic soils, however, often does require application of inorganic amendments in combination with tillage to initiate structural recovery. Sodicity is currently not considered to be a problem at any of the three main irrigation areas in W.A., but all have sodic soil within their potentially irrigable lands, which may limit their future expansion.
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Nicolle, D., M. Byrne und M. Whalen. „A taxonomic revision and morphological variation within Eucalyptus series Subulatae subseries Oleaginae (Myrtaceae), including the oil mallee complex, of south-western Australia“. Australian Systematic Botany 18, Nr. 6 (2005): 525. http://dx.doi.org/10.1071/sb04038.
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Morphological variation within Eucalyptus series Subulatae subseries Oleaginae, a group of mallee taxa distributed in south-western Australia, was assessed by adult and seedling characteristics. A total of 36 adult morphological characters and 20 seedling characters was included in phenetic analyses of 82 individuals representing 29 populations covering all the taxa and the broad geographical distribution of the series. The phenetic analyses indicate relatively weak separation of all previously recognised taxa within E. subser. Oleaginae, except for E. longissima (previously referred to as E. grasbyi), which is distinctive in its seedling morphology, and to a lesser degree, E. ultima, which is also most easily distinguished by seedling morphology. E. eremicola, E. peeneri and E. sublucida are not well differentiated from one another, differing significantly only in adult leaf colour and gloss. The three previously recognised species of the oil mallee complex (E. kochii, E. plenissima and E. ‘horistes’) are also only weakly differentiated from one another. Two variants within E. kochii were observed to differ from each other in several adult vegetative and floral characteristics and are recognised at the subspecific level. A new taxonomy for E. subser. Oleaginae is presented, based on phenetic analyses combined with extensive field, glasshouse and herbarium examination of all taxa in the subseries. A new species is described (E. longissima Nicolle sp. nov.) to accommodate populations of mallees previously erroneously referred to E. grasbyi. New combinations are made for E. peeneri [E. eremicola subsp. peeneri (Blakely) Nicolle comb. nov.] and E. oleosa var. borealis [E. kochii subsp. borealis (C. Gardner) Nicolle comb. nov.] and two new subspecies of E. kochii are described (subspp. amaryssia Nicolle and yellowdinensis Nicolle). Eucalyptus sublucida is considered to be synonymous with E. eremicola subsp. peeneri. Keys to the taxa within the subseries are presented.
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Bunn, Eric. „Development of in vitro methods for ex situ conservation of Eucalyptus impensa, an endangered mallee from southwest Western Australia“. Plant Cell, Tissue and Organ Culture 83, Nr. 1 (Oktober 2005): 97–102. http://dx.doi.org/10.1007/s11240-005-3275-2.
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Wu, Hongwei, Yun Yu und Kongvui Yip. „Bioslurry as a Fuel. 1. Viability of a Bioslurry-Based Bioenergy Supply Chain for Mallee Biomass in Western Australia“. Energy & Fuels 24, Nr. 10 (21.10.2010): 5652–59. http://dx.doi.org/10.1021/ef1008105.
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Kennington, W. J., und S. H. James. „Allozyme and Morphometric Variation in Two Closely Related Mallee Species from Western Australia, Eucalyptus argutifolia and E. obtusiflora (Myrtaceae)“. Australian Journal of Botany 46, Nr. 2 (1998): 173. http://dx.doi.org/10.1071/bt97009.
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The Eucalyptus series Dumosae is ataxonomic group noted for its complex patterns of variation andintergradations between species. In this study, allozymes and morphometricanalysis of adult characters were used to assess the relationship between twomorphologically similar and geographically contiguous member species endemicto Western Australia, E. argutifolia Grayling & Brooker and E. obtusiflora DC. The results showed noevidence of clinal variation between the two species using either technique,and thus supported the current taxonomy. In addition, morphometric analysisrevealed two discrete groups within E. obtusiflora, andit was suggested that formal recognition of the two different forms waswarranted. Consistent with expectations based on earlier studies, all measuresof genetic variability calculated from allozyme data indicated thatpopulations of the widespread E. obtusiflora maintainmore genetic variation than the geographically restrictedE. argutifolia. Factors contributing to reducedvariation in E. argutifolia are discussed, and it wassuggested that it was primarily due to founder events. Strategies for theconservation of genetic resources of both species are also discussed in lightof the data presented.
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Short, Jeff, und Andrew Hide. „Successful reintroduction of the brushtail possum to Wadderin Sanctuary in the eastern wheatbelt of Western Australia“. Australian Mammalogy 36, Nr. 2 (2014): 229. http://dx.doi.org/10.1071/am14005.
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The brushtail possum (Trichosurus vulpecula) was reintroduced to the fox-free habitat of the Wadderin Sanctuary in the eastern wheatbelt of Western Australia in 2008. Subsequent monitoring through to 2013 has revealed a small but healthy extant population that occupies all suitable habitat with some animals moving beyond the predator-free sanctuary to adjoining woodland patches. Possums occurred at a low density and had large home ranges relative to other studies at more mesic sites elsewhere. This is likely linked to the low productivity of the site (annual average rainfall of 332 mm) and one-way dispersal of young across the barrier fence. Possums preferentially occupied woodlands of York gum and salmon gum, utilised rock she-oak habitat, but made little use of shrubland and mallee habitats within the sanctuary. Female possums appeared to mature at an early age and to have young for much of the year. Recruitment was biased towards males in the first four years of establishment; although many appeared to rapidly disappear from the population. The success of this reintroduction is most likely linked to the initial release of possums into vacant habitat, the absence of foxes, and the ready availability of hollows in mature eucalypts and shelter sites in rock crevices.
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M. Watson, David, I. Ralph Mac Nally und Andrew F. Bennett. „The avifauna of severely fragmented, Buloke Allocasuarina luehmanni woodland in western Victoria, Australia“. Pacific Conservation Biology 6, Nr. 1 (2000): 46. http://dx.doi.org/10.1071/pc000046.
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Buloke Allocasuarina luehmanni woodland is an endangered habitat type that was once widespread in southern Australia but now is restricted to a series of remnants, many of which are located in the Wimmera region of western Victoria. The bird communities inhabiting 27 remnants were sampled on transects of 1.0 ha at 6-week intervals over one year. Ninety-five species of birds were observed in Buloke woodlands, of which 66 species were recorded during transect counts. The total species richness, the richness of groups of birds based on their habitat use, and the composition of assemblages on transects, were examined in a series of analyses with respect to habitat type (which probably reflects "quality"), remnant area, shape, isolation and geographic location. There was little evidence for attributes of remnants significantly influencing species richness per transect, but the composition of avifaunal assemblages varied in relation to habitat type, size and geographic location. The Buloke woodlands supported a diverse assemblage, including numerous species believed to be experiencing a regional decline in southern Australia. The composition of the Buloke assemblage has similarities to those of dry eucalypt woodlands across the plains of central Victoria, but elements contributing to a distinctive avifauna include species associated with semi-arid and mallee environments, and a high frequency of occurrence of a group of small insectivores (thornbills, robins) that favour dry She-oak and Callitris woodlands. A likely reason for the rich representation of small insectivores in woodland stands, even in small degraded remnants grazed by stock, was the scarcity of the Noisy Miner Manorina melanocephala that are often common in eucalypt remnants and known to aggressively exclude other species. The results of this study add weight to the recommendation that protection and restoration of Buloke woodlands is a priority for conservation in the Wimmera bioregion of Victoria.
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Yu, Yun, und Hongwei Wu. „Bioslurry as a Fuel. 2. Life-Cycle Energy and Carbon Footprints of Bioslurry Fuels from Mallee Biomass in Western Australia“. Energy & Fuels 24, Nr. 10 (21.10.2010): 5660–68. http://dx.doi.org/10.1021/ef100957a.
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Vines, R. G. „Australian rainfall patterns and the southern oscillation. 2. A regional perspective in relation to Luni-solar (Mn) and Solar-cycle (Sc) signals“. Rangeland Journal 30, Nr. 3 (2008): 349. http://dx.doi.org/10.1071/rj07025.
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This investigation is an extension of earlier work on rainfall patterns in eastern Australia. Using district averages rather than rainfall data for individual cities or towns, further evidence is provided for cyclic variations in precipitation with periods of 18–19, 10–11 and 6–7 years. Results from various regional areas in western Queensland and western New South Wales differ from those found further south in Victoria, and connections are suggested between El Niño/southern oscillation events and the incidence of drought in these two separate areas. Such findings are consistent with ecological aspects of the quasi-periodic occurrence of bushfire seasons as observed in both Victorian eucalypt forests after prolonged drought, or after intermittent widespread rains in the semi-arid Mallee rangelands of western New South Wales. The ~19-year cycles may be at least partly a reflection of solar and lunar tidal components and the ~11-year cycles (connected with the Sunspot cycle) could be the result of absorption of short wavelength solar emissions in the stratosphere and resultant photochemical events magnified to produce sea surface temperature changes. The ~19-year cycles are apparently associated with either increased or decreased rainfall, and such connections appear to reverse in parts of Australia about every 100 years. These reversals have been associated with major droughts at the end of the 19th and 20th centuries.
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Spencer, Beren, Amir Abadi, John Bartle, Robert Sudmeyer, Sarah Van Gent, Mark Gibberd und Ayalsew Zerihun. „Determinants of the economic viability of mallee eucalypts as a short rotation coppice crop integrated into farming systems of Western Australia“. GCB Bioenergy 13, Nr. 1 (15.11.2020): 242–56. http://dx.doi.org/10.1111/gcbb.12775.
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Ruykys, Laura. „Multi-scale habitat associations of the black-footed rock-wallaby in north-western South Australia“. Wildlife Research 44, Nr. 3 (2017): 207. http://dx.doi.org/10.1071/wr17025.
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Context Research on species’ habitat associations is strengthened if it combines coarse-grained landscape data with finer-scale parameters. However, due to the effort required to measure fine-scale parameters, studies on threatened species that unite these two scales remain relatively rare. Aim This study aimed to undertake a multi-scale analysis of the habitat association of the threatened Petrogale lateralis (MacDonnell Ranges race) in the Anangu Pitjantjatjara Yankunytjatjara (APY) Lands, South Australia. Method Analyses were conducted at four spatial scales: (1) across the Central Ranges IBRA Region (regional scale); (2) on hills in the APY Lands at which P. lateralis is extant and extinct (site scale); (3) at ‘core’ and ‘non-core’ areas within those hills (hillside scale); and (4) at rocky refuges. The maximum entropy approach through the software MaxEnt was used for the analysis at the regional scale. At the remaining scales, fieldwork was used to collect, and regression modelling to analyse, data. Key results At the regional scale, presence was associated with slope and geology. At the site scale, aspect, rock abundance and habitat type are likely to have facilitated animal persistence at extant sites. At the hillside scale, the aspect, vegetation type and rock complexity of core areas are likely to have contributed to their higher use. Size, exposure and accessibility were significant predictors of the use of rocky refuges. Conclusions All four spatial scales yielded novel information on the habitat associations of P. lateralis, supporting previous researchers’ suggestions that habitat modelling should be conducted at multiple spatial scales. Implications The study exemplifies the utility of combining MaxEnt modelling with fieldwork-derived data. The results may have conservation implications for this threatened race, and may also provide a model for other studies of faunal habitat associations.
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Byrne, M., und B. Macdonald. „Phylogeography and conservation of three oil mallee taxa, Eucalyptus kochii ssp. kochii, ssp. plenissima and E. horistes“. Australian Journal of Botany 48, Nr. 3 (2000): 305. http://dx.doi.org/10.1071/bt99017.
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Eucalyptus kochii ssp. kochii, ssp. plenissima and E. horistes are planted for eucalypt oil production and land rehabilitation in Western Australia. Variation in cpDNA was investigated by RFLP analysis of 10 populations across the distribution of the three taxa. Diversity in the chloroplast genome was high, with most of the diversity distributed between populations. The three taxa formed a cohesive group that was clearly differentiated from E. oleosa, which was used as an outgroup. There was some differentiation of E. kochii ssp. kochii from E. kochii ssp. plenissima and E. horistes. Several mutations specific to the E. kochii ssp. kochii, ssp. plenissima and E. horistes haplotypes were present in a variant of E. oleosa, suggesting that introgression has occurred. Congruence between cp gene genealogy and geographic distribution was consistent with limited maternal gene flow between populations. There was little structuring of haplotype diversity and the pattern of variation in the cp genome was congruent with that previously detected in the nuclear genome.
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Jonson, J. H., und D. Freudenberger. „Restore and sequester: estimating biomass in native Australian woodland ecosystems for their carbon-funded restoration“. Australian Journal of Botany 59, Nr. 7 (2011): 640. http://dx.doi.org/10.1071/bt11018.
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In the south-western region of Australia, allometric relationships between tree dimensional measurements and total tree biomass were developed for estimating carbon sequestered in native eucalypt woodlands. A total of 71 trees representing eight local native species from three genera were destructively sampled. Within this sample set, below ground measurements were included for 51 trees, enabling the development of allometric equations for total biomass applicable to small, medium, and large native trees. A diversity of tree dimensions were recorded and regressed against biomass, including stem diameter at 130 cm (DBH), stem diameter at ground level, stem diameter at 10 cm, stem diameter at 30 cm, total tree height, height of canopy break and mean canopy diameter. DBH was consistently highly correlated with above ground, below ground and total biomass. However, measurements of stem diameters at 0, 10 and 30 cm, and mean canopy diameter often displayed equivalent and at times greater correlation with tree biomass. Multi-species allometric equations were also developed, including ‘Mallee growth form’ and ‘all-eucalypt’ regressions. These equations were then applied to field inventory data collected from three locally dominant woodland types and eucalypt dominated environmental plantings to create robust relationships between biomass and stand basal area. This study contributes the predictive equations required to accurately quantify the carbon sequestered in native woodland ecosystems in the low rainfall region of south-western Australia.
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Abensperg-Traun, Max, Dion Steven und Lyn Atkins. „The influence of plant diversity on the resilience of harvester termites to fire“. Pacific Conservation Biology 2, Nr. 3 (1995): 279. http://dx.doi.org/10.1071/pc960279.
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The harvester termites in floristically rich mallee-heath of southern Western Australia appear resilient to high-intensity fire. This contrasts with the temporary extinction of harvesters occupying a narrow food niche in floristically simple, intensely burnt spinifex Triodia angusta grassland in tropical Western Australia. The present study examines the effects of high-intensity fire on harvester termites Drepanotermes tamminensis in vegetation of intermediate floristic diversity and compares its findings with these earlier studies. We sampled 20 mounds (termitaria) in both an unburnt and (adjacent) burnt stand of Allocasuarina campestris shrubland. Although partially regenerated three years after the fire, 40% of mounds in the burnt area were abandoned, contrasting with 10% in the unburnt stand. No harvested chaff was found in any of the abandoned mounds. The extent of mound occupation by D. tamminensis was considerably lower, and ant invasion higher, in the burnt stand. These findings are consistent with the hypothesis that high floristic diversity enhances the resilience of harvester termites to fire. The most likely mechanism is the availability of a range of plant (food) species with different regenerative responses to high-intensity fire. The death of spinifex and the associated harvester termites after fire may be atypical. We argue, however, that temporary extinction of harvester populations in arid Australia may not be exceptional, particularly where fire coincides with drought and high livestock grazing pressure. Rigorous experimental studies are necessary to enhance our understanding of the long-term effects of fire on harvester termite populations in different vegetation types and climatic zones.
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Vieira, E. M., G. R. Finlayson und C. R. Dickman. „Habitat use and density of numbats (Myrmecobius fasciatus) reintroduced in an area of mallee vegetation, New South Wales“. Australian Mammalogy 29, Nr. 1 (2007): 17. http://dx.doi.org/10.1071/am07002.
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The distribution of the numbat (Myrmecobius fasciatus) has been dramatically reduced since European settlement, with remnant populations now occurring naturally only in the south west of Western Australia. In recent years a number of reintroductions have led to the reestablishment of this species in parts of its former range. In this study we investigated the density and habitat use of the numbat within a 4,000 ha feral - free site on Scotia Sanctuary in western New South Wales. Numbats had been reintroduced to this site in 1999 and 2000. During transect sampling 500 km were driven and 10 numbats were observed. An additional 14 sightings were made incidentally during the survey period. We estimated the density of numbats at Scotia to be 1.24 individuals/100 ha (SE = 0.56). Numbats were located randomly throughout the four major vegetation communities within the reintroduction site. At a finer scale, numbats selected for areas with less spinifex and less bare ground, although visibility using this sampling technique in areas with less spinifex cover may be increased. This study provides information on the habitats used and selected for by numbats at a local scale, and suggests that the species is capable of re-inhabiting areas within its former range where essential resources such as food and shelter are still available at adequate levels, and introduced predators are absent. This, in turn, has implications for future management decisions about how and where to reintroduce this species to other parts of its former range.
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Cleary, Paul. „Native title contestation in Western Australia's Pilbara region“. International Journal for Crime, Justice and Social Democracy 3, Nr. 3 (01.12.2014): 132–48. http://dx.doi.org/10.5204/ijcjsd.v3i3.182.
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The rights afforded to Indigenous Australians under the Native Title Act 1993 (NTA) are very limited and allow for undue coercion by corporate interests, contrary to the claims of many prominent authors in this field. Unlike the Commonwealth’s first land rights law, Aboriginal Lands Rights (Northern Territory) Act 1976 (ALRA) , the NTA does not offer a right of veto to Aboriginal parties; instead, they have a right to negotiate with developers, which has in practice meant very little leverage in negotiations for native title parties. And unlike ALRA, developers can deal with any Indigenous corporation, rather than land councils. These two factors have encouraged opportunistic conduct by some developers and led to vexatious litigation designed to break the resistance of native title parties, as demonstrated by the experience of Aboriginal corporations in the iron ore-rich Pilbara region of Western Australia.
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Finlay, Summer May, Sujatha Raman, Elizabeth Rasekoala, Vanessa Mignan, Emily Dawson, Liz Neeley und Lindy A. Orthia. „From the margins to the mainstream: deconstructing science communication as a white, Western paradigm“. Journal of Science Communication 20, Nr. 01 (01.02.2021): C02. http://dx.doi.org/10.22323/2.20010302.
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In this commentary we are concerned with what mainstream science communication has neglected through cultural narrowness and ambient racism: other practitioners, missing audiences, unvalued knowledge, unrecognised practices. We explore examples from First Nations Peoples in the lands now known as Australia, from Griots in West Africa and from People's Science Movements in India to help us reimagine science communication. To develop meaningfully inclusive approaches to science communication, we argue there is an urgent need for the ‘mainstream’ to recognise, value and learn from science communication practices that are all too often seen as at ‘the margins’ of this field.
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Moore, Andrew D. „Opportunities and trade-offs in dual-purpose cereals across the southern Australian mixed-farming zone: a modelling study“. Animal Production Science 49, Nr. 10 (2009): 759. http://dx.doi.org/10.1071/an09006.
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Dual-purpose cereals are employed in the high-rainfall zone of southern Australia to provide additional winter forage. Recently there has been interest in applying this technology in the drier environments of South and Western Australia. It would therefore be useful to gain an understanding of the trade-offs and risks associated with grazing wheat crops in different locations. In this study the APSIM (Agricultural Production Systems Simulator) crop and soil simulation models were linked to the GRAZPLAN pasture and livestock models and used to examine the benefits and costs of grazing cereal crops at 21 locations spanning seven of the regions participating in the Grain & Graze research, development and extension program. A self-contained part of a mixed farm (an annual pasture–wheat rotation plus permanent pastures) supporting a breeding ewe enterprise was simulated. At each location the consequences were examined of: (i) replacing a spring wheat cultivar with a dual-purpose cultivar (cv. Wedgetail or Tennant) in 1 year of the rotation; and (ii) either grazing that crop in winter, or leaving it ungrazed. The frequency of early sowing opportunities enabling the use of a dual-purpose cultivar was high. When left ungrazed the dual-purpose cultivars yielded less grain on average (by 0.1–0.9 t/ha) than spring cultivars in Western Australia and the Eyre Peninsula but more (by 0.25–0.8 t/ha) in south-eastern Australia. Stocking rate and hence animal production per ha could be increased proportionately more when a dual-purpose cultivar was used for grazing; because of the adjustments to stocking rates, grazing of the wheat had little effect on lamb sale weights. Across locations, the relative reduction in wheat yield caused by grazing the wheats was proportional to the grazing pressure upon them. Any economic advantage of moving to a dual-purpose system is likely to arise mainly from the benefit to livestock production in Western Australia, but primarily from grain production in south-eastern Australia (including the Mallee region). Between years, the relationship between increased livestock production and decreased grain yield from grazing crops shifts widely; it may therefore be possible to identify flexible grazing rules that optimise this trade-off.
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Hayward, Matt W., Aline Si Lin Poh, Jennifer Cathcart, Chris Churcher, Jos Bentley, Kerryn Herman, Leah Kemp et al. „Numbat nirvana: conservation ecology of the endangered numbat (Myrmecobius fasciatus) (Marsupialia : Myrmecobiidae) reintroduced to Scotia and Yookamurra Sanctuaries, Australia“. Australian Journal of Zoology 63, Nr. 4 (2015): 258. http://dx.doi.org/10.1071/zo15028.
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Despite a vigorous reintroduction program between 1985 and 2010, numbat populations in Western Australia are either static or declining. This study aimed to document the population ecology of numbats at two sites that are going against this trend: Scotia Sanctuary in far western New South Wales and Yookamurra Sanctuary in the riverland of South Australia. Scotia (64 659 ha) and Yookamurra (5026 ha) are conservation reserves owned and managed by the Australian Wildlife Conservancy and where numbats were reintroduced in 1999 and 1993 respectively. Both sites have large conservation-fence-protected introduced-species-free areas where there are no cats (Felis catus) or red foxes (Vulpes vulpes). Numbats were sourced from both wild and captive populations. From small founder populations, the Scotia numbats are now estimated to number 169 (113–225) with 44 at Yookamurra. Radio-collared individuals at Scotia were active between 13 and 31°C. Females had home ranges of 28.3 ± 6.8 ha and males 96.6 ± 18.2 ha, which leads to an estimated sustainable population or carrying capacity of 413–502 at Scotia. Captive-bred animals from Perth Zoo had a high mortality rate upon reintroduction at Scotia due to predation by raptors and starvation. The habitat preferences for mallee with a shrub understorey appear to be driven by availability of termites, and other reintroduced ecosystem engineers appear to have been facilitators by creating new refuge burrows for numbats. This study shows that numbats can be successfully reintroduced into areas of their former range if protected from introduced predators, and illustrates the difficulties in monitoring such cryptic species.
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Holm, AM, und RJ Allen. „Seasonal changes in the nutritive value of grass species in Spinifex pastures of Western Australia.“ Rangeland Journal 10, Nr. 1 (1988): 60. http://dx.doi.org/10.1071/rj9880060.
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This study was undertaken to assess whether the nutritional quality of spinifex pasture lands is improved by buming to promote the growth of grasses other than spinifex. We selected two comparable sites in the Exmouth Gulf region of Western Australia; one had been bumt in late 1979 and the other had not been burnt for many years. On these sites we sampled the five grass species present, as well as Triodia pungens (soft spinifex) and Plectrachne >chinzii (Oat eared spinifex) on 10 occasions from March 1980 to April 1982. Plant parts were analysed for nitrogen, phosphorus and sulphur content, and in vitro digestibility. None of the common grass species tested was more nutritious or more palatable than soft spinifex. It seems that little is gained from manipulating spinifex pastures through burning if the aim is to encourage alternative grass species. There is a need however for further studies into the importance of woody herbs and forbs in the nutrition of grazing animals on spinifex country and the effect of fire on these species.
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Chudleigh, JW. „The Impact of the Changed Financial Environment on Rangeland Management and Ownership Structures.“ Rangeland Journal 15, Nr. 1 (1993): 167. http://dx.doi.org/10.1071/rj9930167.
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The dramatic change in the western world's economic environment is characterised by lower inflation, unserviceable indebtedness, lower commodity prices, greater environmental awareness and a complete readjustment of values and bank lending policies as an era of greater financial conservatism develops. An understanding of this historic turning point in economic developments, especially in Australia, brings into question many established concepts of management of our agricultural resources. This paper questions whether these changes demand a more dramatic rethink of the management of our western lands to ensure that the economic imperative of profit (the driving force for private occupancy of pastoral areas) can sit comfortably with the environmental responsibility being increasingly demanded by society.
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Sudmeyer, R., und F. Flugge. „The economics of managing tree - crop competition in windbreak and alley systems“. Australian Journal of Experimental Agriculture 45, Nr. 11 (2005): 1403. http://dx.doi.org/10.1071/ea04155.
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Re-introducing trees and shrubs into agricultural landscapes as agroforestry systems establishes a tension between long-term objectives, such as increasing shelter, water use, nature conservation and harvesting tree products, and the short-term objective of maximising crop and pasture profitability. This paper describes the growth of crops, pastures and trees at the tree–crop interface in agroforestry systems and the economic returns from alley farming and windbreak systems using various tree–crop competition management strategies in the Esperance region of Western Australia. Severing lateral tree roots (root-pruning), harvesting mallees and allowing them to coppice, or thinning trees for sawlog regimes increased the yield of crops and pastures in the competition zone. In some instances, these increases were significant: root-pruning increased the annual return from crops grown in the competition zone of Pinus radiata by up to $548/km of the tree line at 1 site. Conversely, root-pruning reduced tree growth by 14–43% across all sites. Therefore, where trees provide benefits, such as shelter from damaging winds, the benefits of reduced tree–crop competition may not offset the consequent reduction in rate of tree growth. For mallee–crop alley systems on agriculturally productive soils, mallee growth rates must be high enough to compensate for crop losses in the competition zone. On less agriculturally productive soils, block-planting mallees may be more profitable than alley systems or crops without competition (sole-crops). This research has shown that competition management strategies can be used to manipulate the relative productivity of trees, crops and pasture at the tree–agriculture interface. The use of these strategies will depend on the relative economic value of tree and crop products and the value placed on other tree benefits, such as shelter and reduced groundwater recharge.