scholarly journals J. T. Jutson: A Master of Synthesis

2014 ◽  
Vol 25 (1) ◽  
pp. 28
Author(s):  
C. Rowland Twidale ◽  
Erland J. Brock
Keyword(s):  
Western Australia ◽  
Arid Zone ◽  
Regional Scale ◽  
Field Experiences ◽  
Geological Survey ◽  
Two Stage ◽  
Explanatory Account ◽  
High Plain ◽  
Stage Development ◽  
Western Australian

John Thomas Jutson (1874–1959) spent most of his life as a practising solicitor in Melbourne. He studied the Victorian coast as a hobby in his later years, though he became known for his work on the Sydney shoreline and the proposal that different processes have simultaneously generated platforms at various levels. Between 1911 and 1918, however, Jutson had been employed as a field geologist by the Geological Survey of Western Australia. Drawing on the work of colleagues as well as his own brief field experiences, he produced an explanatory account of the Western Australian landscape that was published in 1914 and reprinted in revised form in 1934 and 1950. In his synthesis he discussed hitherto neglected arid zone landforms and processes. He presented evidence and argument pointing to the plateau and high plain that occupies so much of the interior of the State being a two-stage development. He attributed it to what would later be called etching, resulting in double planation at a regional scale. His innovative interpretations brought Jutson international recognition.

scholarly journals II.—The Classification of the Rocks of the Western Australian Goldfields

1912 ◽  
Vol 9 (4) ◽  
pp. 147-153
Author(s):  
J. Allan Thomson
Keyword(s):  
Western Australia ◽  
Geological Structure ◽  
The State ◽  
Geological Survey ◽  
Casual Reader ◽  
Geological Features ◽  
The World ◽  
Detailed Work ◽  
Western Australian

Thanks to the descriptions published by visiting mining engineers and the more detailed work of the Geological Survey of the State, the general geological features of those parts of Western Australia in which mining is carried on are now well known. A surprising degree of uniformity of geological structure and mode of gold occurrence is revealed over an extent of country unparalleled elsewhere in the world. And yet it is safe to assume that to the casual reader who has not visited the country the above publications present little else than a mass of bewildering detail.“For reasons which can be readily understood, geological inquiry in Western Australia has up to the present consisted chiefly of a series of unconnected observations to the co-ordination of which we must look to the future.”

An extension to the known range of the desert mouse Pseudomys desertor south into the Great Victoria Desert, Western Australia.

2003 ◽  
Vol 25 (1) ◽  
pp. 95 ◽  
Author(s):  
DL Alpers ◽  
G Gaikhorst ◽  
C Lambert ◽  
T Fletcher ◽  
P.B.S. Spencer
Keyword(s):  
Western Australia ◽  
Nature Reserve ◽  
Arid Zone ◽  
Salting Out ◽  
North West ◽  
Australian Museum ◽  
Flinders Ranges ◽  
Queen Victoria ◽  
Mount Keith ◽  
Western Australian

THE desert mouse Pseudomys desertor is a medium sized rodent (15 – 30 g) which has a widespread distribution throughout the arid zone of Australia (Menkhorst and Knight 2001). It is considered locally abundant in habitats containing samphire, sedge, nitrebush or mature spinifex grasslands. A tolerance to disturbed habitat (from mining or grazing) has also been noted (Read et al. 1999). The distribution of the species once extended from the Murray-Darling through the Flinders Ranges to the Gibson and Great Sandy Deserts, to the west coast and onto Bernier Island (Read et al. 1999; Menkhorst and Knight 2001). Since European colonisation there has been a contraction of the species’ range to the central deserts (Kerle 1995; Read et al. 1999). In Western Australia, the most southerly historical or contemporary record, is from the Wanjarri Nature Reserve (near Mount Keith), 370 km north of Kalgoorlie (D. Pearson pers. comm.; Western Australian Museum fauna database: http://203.30.234.168/). Recently, however, a suspected P. desertor was caught north-west of Queen Victoria Springs (QVS) in the Great Victoria Desert (GPS 30o 03’ 56’’S; 122o 55’ 28’’E), approximately 350 km to the south-east of its most southern known locality. The specimen had the distinctive buff-orange eye ring, size and general features of P. desertor described in Kerle (1995) and Menkhorst and Knight (2001). Prior to release of the specimen, an ear biopsy was obtained for DNA investigation and genomic DNA was extracted from the biopsy via a variation on the salting out procedure of Miller et al. (1988).

Impact of Red Kangaroos on the Pasture Layer in the Western Australian Arid Zone.

1993 ◽  
Vol 15 (1) ◽  
pp. 12 ◽  
Author(s):  
GL Norbury ◽  
DC Norbury ◽  
RB Hacker
Keyword(s):  
Species Diversity ◽  
Western Australia ◽  
Arid Zone ◽  
Perennial Grass ◽  
Shrub Community ◽  
Macropus Rufus ◽  
Perennial Shrub ◽  
Native Shrubs ◽  
The Impact ◽  
Western Australian

We studied the impact of grazing by red kangaroos (Macropus rufus) on pasture biomass and species diversity over a 32-month period in destocked open shrubland in the Gascoyne region of Western Australia. Grazing significantly impeded the accumulation of annual and perennial grass biomass in a degraded perennial shrub community (Pc0.001 and P<0.05) and on denuded sites that were cultivated and reseeded with native shrubs (P<0.01 and Pc0.01). The accumulation of annual and perennial forb biomass was unaffected by kangaroo grazing. After 12 months, pasture species diversity was significantly greater on degraded perennial sites protected from kangaroo grazing (P<0.05). Commercial kangaroo shooting did not alleviate the impact of kangaroo grazing on grass accumulation (P<0.01). Unless more effective methods of kangaroo control are integrated with stock reductions, the recovery of degraded rangeland pastures is likely to be severely limited.

The dependence of alumina and silica contents on the extent of alteration of weathered ilmenites from Western Australia

1983 ◽  
Vol 47 (343) ◽  
pp. 201-208 ◽  
Author(s):  
M. T. Frost ◽  
I. E. Grey ◽  
I. R. Harrowfield ◽  
K. Mason
Keyword(s):  
Western Australia ◽  
Impurity Content ◽  
Two Stage ◽  
Ambient Environment ◽  
Ti Content ◽  
Western Australian

AbstractThe distribution of the minor impurities, aluminium and silicon, between co-existing phases in altered ilmenite grains from three Western Australian localities has been investigated using SEM and electronmicroprobe analyses. A striking dependence of the impurity levels on the Ti/(Ti + Fe) fraction is observed. For compositions with Ti/(Ti + Fe) between 0.45 and 0.60, i.e. between ferrian-ilmenite and pseudorutile, the impurity content is virtually independent of Ti/(Ti + Fe), and is very low (0.2 wt. % Al2O3. 0.05 wt. % SiO2). For compositions between those of rutile and pseudorutile, there is a direct correlation between the impurity contents and the Ti content of the alteration phase. The impurity levels increase with increasing Ti/(Ti+Fe) to about 3 wt. % Al2O3 and 1 wt. % SiO2 for compositions close to TiO2. Thus during the latter stages of ilmenite alteration, alumina and silica are extracted from the ambient environment and are coprecipitated with, or adsorbed on to, the alteration products. The observed dependence of the alumina and silica contents on extent of alteration is consistent with a two-stage alteration mechanism earlier proposed (Grey and Reid, 1975).

Factors that contribute to urban–rural gradients in risk of schizophrenia: Comparing Danish and Western Australian registers

2021 ◽  
pp. 000486742110096
Author(s):  
Oleguer Plana-Ripoll ◽  
Patsy Di Prinzio ◽  
John J McGrath ◽  
Preben B Mortensen ◽  
Vera A Morgan
Keyword(s):  
Confidence Interval ◽  
Western Australia ◽  
Urban Areas ◽  
Proportional Hazards ◽  
Cox Proportional Hazards ◽  
Hazard Ratio ◽  
Indigenous Status ◽  
Increased Risk ◽  
The Relationship ◽  
Western Australian

Introduction: An association between schizophrenia and urbanicity has long been observed, with studies in many countries, including several from Denmark, reporting that individuals born/raised in densely populated urban settings have an increased risk of developing schizophrenia compared to those born/raised in rural settings. However, these findings have not been replicated in all studies. In particular, a Western Australian study showed a gradient in the opposite direction which disappeared after adjustment for covariates. Given the different findings for Denmark and Western Australia, our aim was to investigate the relationship between schizophrenia and urbanicity in these two regions to determine which factors may be influencing the relationship. Methods: We used population-based cohorts of children born alive between 1980 and 2001 in Western Australia ( N = 428,784) and Denmark ( N = 1,357,874). Children were categorised according to the level of urbanicity of their mother’s residence at time of birth and followed-up through to 30 June 2015. Linkage to State-based registers provided information on schizophrenia diagnosis and a range of covariates. Rates of being diagnosed with schizophrenia for each category of urbanicity were estimated using Cox proportional hazards models adjusted for covariates. Results: During follow-up, 1618 (0.4%) children in Western Australia and 11,875 (0.9%) children in Denmark were diagnosed with schizophrenia. In Western Australia, those born in the most remote areas did not experience lower rates of schizophrenia than those born in the most urban areas (hazard ratio = 1.02 [95% confidence interval: 0.81, 1.29]), unlike their Danish counterparts (hazard ratio = 0.62 [95% confidence interval: 0.58, 0.66]). However, when the Western Australian cohort was restricted to children of non-Aboriginal Indigenous status, results were consistent with Danish findings (hazard ratio = 0.46 [95% confidence interval: 0.29, 0.72]). Discussion: Our study highlights the potential for disadvantaged subgroups to mask the contribution of urban-related risk factors to risk of schizophrenia and the importance of stratified analysis in such cases.

Life cycle of the western school prawn, Metapenaeus dalli Racek, in a Western Australian estuary

1986 ◽  
Vol 37 (1) ◽  
pp. 95 ◽  
Author(s):  
IC Potter ◽  
JW Penn ◽  
KS Brooker
Keyword(s):  
Life Cycle ◽  
Western Australia ◽  
Sexual Maturity ◽  
Second Year Of Life ◽  
Second Year ◽  
Australian Estuary ◽  
Western Australian

The absence of marine records for M. dalli below latitude 31�S., together with data on gonadal stages and spermatophore deposition on females of this species in the Swan estuary, provide very strong indications that the western school prawn typically breeds in estuarine environments in south-western Australia. The 0 + recruits, which first appeared in samples in February, remained in the estuary during the following months and by November had reached a size suitable for exploitation. At this time they were approaching sexual maturity and were starting to move from the shallows to the deeper waters of the estuary where they remained for their second year of life. In contrast to Australian Penaeus species, M. dalli mates during the intermoult period when the shell is hard rather than immediately after moulting.

Aspects of reproduction, and morphology of the penis, of Pseudantechinus woolleyae (Marsupialia : Dasyuridae)

2017 ◽  
Vol 65 (6) ◽  
pp. 357 ◽  
Author(s):  
P. A. Woolley
Keyword(s):  
Western Australia ◽  
Arid Regions ◽  
Wide Distribution ◽  
Erectile Tissue ◽  
Australian Museum ◽  
Seasonal Breeder ◽  
Males And Females ◽  
One Year ◽  
Western Australian

Woolley’s Pseudantechinus, P. woolleyae, has remained virtually unstudied in the 30 years since its recognition in 1988 as a species distinct from P. macdonnellensis. It has a wide distribution in arid regions of Western Australia. What little is known of its biology comes largely from studies carried out over the years 1988–91 on one wild-caught female and her offspring, and a few specimens held in the collection of the Western Australian Museum. P. woolleyae is a seasonal breeder and young are born from late July to early October. They mature when ~7 months old. Both males and females are potentially capable of breeding in more than one year. Males have accessory erectile tissue that does not form an appendage on the penis.

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